Wings

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A new year, a new project …..

Wing Design:
The wings on this aeroplane have a big what they call in aviation terms “under camber.” The wings on fast planes are almost like a flat board. The reason for that is that they don’t require as much lift because they go fast.

Louis Blรฉriot knew he didn’t have a lot of speed, so he needed a lot of lift at slow speeds. This air-foil gives a lot of lift at slow speeds.

The wing design is very unique for the Blรฉriot.

Sneaky look

About to start with wings. Just having a sneaky look into this new part. Wow looks good, don’t you think?

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Yes getting ready now to start bending the ribs. These are made of 0.5″ tubes. I copied the shape of the bending fixture on some sheet of particle board I found, so tomorrow night I might bend my first rib ๐Ÿ™‚

Wrong rib bending fixture

I am having a few issues here at the moment, as I am sure that the shape of the bending fixture to bend the ribs for the wing is wrong. It must be one for another wing profile. Trying to get more info from Robert on this but apparently he is away for a few weeks.

The bend tube shown below is supposed to be the bottom part of the rib, but that doesn’t match the rib profile at all.

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Currently trying to create a bending fixture myself as I do have the correct wing profile drawing (see above top), see how that goes ๐Ÿ™‚

Something’s wrong

To make a long story short;

I can’t come up with the drawing for the bending fixture that looks even close to what I have seen on a photo with Pascal (see right) bending his tube for the rib at Robert’s workshop. So I will have to ring Robert himself!

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1388923088Something else I had on my todo list was drilling out the holes for the pin in the hinges as shown here (on the elevator). These pins are very hard to get in, and drilling them out once they are installed is almost impossible as there is no room. So I did this for the 16 hinge bits I have sitting here for the ailerons.

All done….. a perfect fit. All I need now is get the correct drawing for the bending fixture………………….

Disapointed

Not good, and a bit disappointed !

Just got an email back from Pascal, he basically used that jig shown above and did a lot of final adjusting by hand to get all his ribs right, as there is no Jig for the Bleriot wing.

Also just spoken with Robert, and yes, every plane is different, and it’s not that there is a jig for every plane. He basically uses the one jig for everything.

He suggested to just put blocks on the bench and start bending and keep on adjusting the blocks until it’s right.

Also other people on the airdrome_builders forum made noises that the one jig is used for all planes (except for Bleriot Grrrrrr) and its just a matter of bending to the right point of the jig on how much bend you want…..

A bit disappointed with that but ah well typical Robert; “all very vague, and not a lot of detail”.

I will probably end up making the perfect jig and mail the drawing to him for future Bleriot builders ๐Ÿ™‚

Making a jig

Yes started making the jig for bending the top tube of the rib yesterday, and this is what I ended up with.

Its not to hard really, just takes some time. You just use a tape measure and try to measure the radius of the curve, by moving the “center” until the measurement is constant for a little distance.

A bit too hard to explain, so I did draw an example on a bit of paper with 3 bits of a circle with different radius’s. So basically you try to find all these bits of circles, and map the whole curve, in this case of the wing rib.

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Then for creating the jig, you go the opposite, but also you need to reduce the radius of each circle segment.

I did that by starting with the first circle segment at a radius of 0.7 of the original one. Cut it out of the sheet of ply and bend the first segment with the tube, and then check out what it looks like. If its too big still, you reduce it a bit more, so use 0.6 of the original radius. When its right then you continue with the next circle segment etc etc. Have a good look at the photo below were you see 5 different circle segments ๐Ÿ™‚

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And then to finish it I had to make one more change as for one of the segments I made the radius to small. See the result below. And yes I can easily now bend the top tubes in seconds. They are all almost identical. Some need just a little tweak here and there, but yes happy with it.

Once I have the bottom tube done I will copy the jig on a piece of paper and mail it to Robert for future builders ๐Ÿ™‚

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Bending ribs

This morning I finished all the top tubes, 26 of them !!
Here you see me bending the top tube of the rib, using the bending jig I made.

Next the 14 bottom tubes. Here’s the jig I made for these tubes,ย with some oil stains from cleaning the engine.

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All bend !! ๐Ÿ™‚

So much easier with the proper jig.ย A copy of the two jigs is in the mail Robert for future Bleriot builders !

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Coping ribs

The goal for today was to cope all the ends of the bottom and top tube’s for the ribs. So after some thinking, I made this tool. Block of timber with a 0.5″ hole for the rib tube and a 1″ hole for the leading or trailing wing tube.
Get the picture ?

See right for a photo made by Pascal when he was building the wing for his Bleriot. This is what it will look like when finished, except my tubes are coped, these ones here aren’t.

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Coping all tubes went really well, so I think I have done well !!

Below the finished tubes. A bit of cleaning up to do and then …….

Bending brackets, so they can be riveted to the two 2″ tube spars !!!!!

But that might have to wait if I get my engine con rods back in about a week ๐Ÿ™‚ I hope.

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Starting with rib brackets

De-burred and sanded all the coped tubes, so ready now for making brackets for mounting these rib tubes to the two 2″ spars.
So there are 13 ribs in each wing, were every second one only has a top tube, probably for saving weight. This means I need to make 2 brackets for each rib, that is 2 * 26 = 52 brackets ๐Ÿ™ ……………

Made some brackets

Started with the brackets today that attach the rib tubes to the spars ๐Ÿ™‚

See below, one picture = 1000 words ! These gusset plates are 2.5″ * 5″ aluminium, as is everything else ๐Ÿ™‚

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One thing you really need to do that will save a lot of time later when mounting the leading and trailing edge 1″ tubes:

I had to adjust the ends of a lot of the 1/2″ rib tubes as they where not in one straight line or too long after the ribs where mounted onto the spars and I was mounting the leading and trailing 1″ tubes.

  1. Bend all the rib’s. Top and bottom ones. Make them as identical as you can.
  2. Cope the ends, well I did.
  3. On a board with dummy spar’s and dummy leading and trailing 1″ tube’s, make sure they fit nicely in between these 1″ leading and trailing tubes, without having to force them in there and without blocks to hold them into place as that will result in them going longer when you pull them of the board. So don’t use blocks as what I did, see photos above.
  4. If you want to use blocks, and you probably should, only use them at the very ends of the ribs, to hold them in place, for the next step.
  5. Mount the two brackets.
  6. Last thing to note is related to the mounting of the ribs on the spars. The back spar snugly sits in between the top and bottom rib tubes. But the front spar sits sort of halfway in between the top and bottom rib tube. If all ribs are identical, then nothing is wrong, but they aren’t. When I mounted the ribs, I used a bit of timber to sit on top of the front spar that determined the height of the rib just before drilling the holes through the bracket for the rivets into the spar. But ideally when you are building the ribs, you mark on the bracket while on the board where the front spar touches the bracket. This is where it needs to be mounted on the real front spar. Reason is that, because not all ribs are identical, so the distance from spar to top rib tube will vary…..

No extra work really but handy to know for when mounting the leading and trailing 1″ tubes.

Assembled ribs for right wing

Made all the ribs for the right wing today. First the full ribs, 7 of them. 4 Rivets per bracket, but only the top 2 are riveted in. Bottom two are not. They will be riveted when the rib is riveted onto the spars.

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Then I made the 6 top only ribs that go in between the 7 full ribs. Normally 6 ribs only have a top tube, for weight savings, and because Robert’s ribs are normally flat or convex.

I decided to divert from that as this rib is concave (hollow). This way the material that is covering the wings can be attached properly. Behind where the bottom tube finishes, the bottom surface of the wing is flat, so no tube is required anymore like in all of Robert’s other ribs to attach the material.

Tomorrow I will start the brackets for the left wing !!1391241389

Brackets left wing

Today I did draw all the bending and cutting lines for the 13 front brackets for the ribs for the left wing on the 2.5″ * 5″ gusset plates, and the 7 full and 6 half brackets for the back of the rib (of the left wing). Also swapped around the fixture I have on the bench with the two bits of spar and the 1″ front tube. This is because all brackets for the left ribs are “pointing” to the left (outside), that is the bit that is riveted into the spar.

Cutting bending sanding

Finished cutting, sanding, bending, more bending and sanding the 13 front brackets for the left wing today. Also did the first whole bracket for the back of the rib of the left wing.

The plan is to finish the remaining 12 brackets this weekend, and hopefully build the ribs, but not sure if that’s going to happen as I have my parents coming over from the Netherlands…………

More ribs

OK parents are here, but still managed to do some work ๐Ÿ™‚

Finished all brackets and finished building about half the ribs. Just 2 more hours and all ribs are done!! So next weekend I can start with the engine !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

Al ribs done

YES finished all ribs finally. Can’t just do as much work with my parents here, but with all ribs done and my parents going traveling 2 weeks now, I can start assembling the engine now !!!! VERY exciting, starting tomorrow ๐Ÿ™‚

Spars

YES back on the wings ๐Ÿ™‚

 

After building all the ribs a few months ago, I now started working on the spars, that together with the compression struts form the skeleton for the wings.ย What I am doing now (see below) is drilling the 4 holes in each spar, where the compression struts are mounted. In order for all the holes to be in the same direction, I clamped the spar in the middle and basically move the electric drill press around.

At the end of the spar is a small extension that slides into the spar that I squashed, by heating it up a little and using the hammer to deform it. This is done now so I don’t have to do it later when its assembled. The tips are narrower as a 3/4″ tube is riveted in there, joining the leading edge of the wing to the trailing edge of the wing. You can just see one of them on the right side of the photo.

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The wing shape I am aiming for is shown in the drawing below. It is part of a drawing of the Bleriot that did the original Channel Crossing in 1909. This wing is a wing warping one. My one will have ailerons.

Very nice shape I think ๐Ÿ™‚

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Spar tangs

Finished the last spar, and started drilling holes in the tangs, before mounting them on the spar. A machined piece of aluminium is used see below,that will be riveted into the compression strut, joining the two spars. Two types of tangs are visible here, the thinner ones for the internal (in the wing) drag and anti drag cables, and the thicker ones for the landing and lift cables.

Will show you tomorrow what the fully assembled spars look like ๐Ÿ™‚

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Compression strut brackets

Today I mounted all the fittings (see above right) onto the spars (see below). Then I adjusted the carry through (see right) sticking out of the fuselage where the spar’s slide on to. I now have 2″ sticking out.

Then I cut the 8 compression struts to the right length, so that the 2 spars line up perfectly with the carry through on the fuselage.
Drilled all the holes for the rivets that will hold the struts onto the spars.
Just need to get a few new rivets as the ones I have are too short.

More tomorrow ๐Ÿ™‚

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Installing compression struts

Sorry was too busy trying to install a new insinkerator yesterday.

So back to plane stuff today.

With Nicki’s help, holding the spar assembly while on the fuselage, I riveted the compression strut closest to the fuselage to make sure the spacing is “perfect”. All others were riveted while on the garage floor ๐Ÿ™‚

Also here you can see one of the ribs on the spars…….. ( and Ben, our dog, inspecting my work )

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Also have a look at the ends of the spars below. Squashed to the size of the tube going along the edge of the wing and at the right angle ( I hope ).

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Navigation and Position lights

Yesterday and today I have been looking at two aspects of the wing ๐Ÿ™‚ Well things to be build into the wing.

First, I always wanted to build lights into the wing but have now decided that it would be to obvious or visible using my first idea, of building lights into the wing. Might also have been a bit to hard as I would have had to make some acrylic glass window, shaped to the rounding of the upper surface if the front of the wing.ย Have now decided to put wiring into the wing going to the tip, and mount a flat area, not much wider than the thickness of the wing tip, for mounting a PowerBurst Plus 3-in-1 Nav/Position/Strobe light from Aveo Engineering (see below right).

It has a green and red navigation light at the front, a white position light at the back, and a white flashing strobe inย between (see below left).

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I am doing it in a way so I can also later replace them with an higher light output version from the same brand if I want to.ย This model here is the entry model, only used on microlight class planes, well in the US they are. Also doing it this way, it means I don’t have to buy them right now, and can install them later when I want. Also saves me quite some time.

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Second, thing I have been investigating is the Pitot tube and its hoses. This tube is mounted in the leading edge of the wing and is measuring air speed. It is going to be connected to the air speed gauge. It is based on the air pressure that builds up when you go faster. Found all the materials needed for this, so all under control !
Also thinking of building one Pitot tube into each wing. One to be connected to the “mechanical” air speed gauge” and the other one to be connected in the future to my Aviation Redundancy Instruments on-board computer.

Bracing the spar assembly

Started bracing the spar assembly. All went very well ๐Ÿ™‚

Fuselage outside, wing inside. Was very windy tonight, but nice and warm, 12 deg C in the middle of winter ๐Ÿ™‚

Fixed the cables on one end, and tightened them from the other end, both at the same time so I could adjust the squareness of the whole structure, when doing the first 2 diagonals. When doing the 2nd and 3rd, I used a string on the outside of the spar to make sure it was straight.

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String to check for a straight spar !

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With all the temporarily cables (strings) tied to the wing, I checked the position of the two ribs closest to the cables (strings).

So now I can start putting all the ribs on, starting with these 2 and then spacing out all the other ones.

Tomorrow I will brace the right wing, and then I can start putting the ribs on !!

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Fixed on one side (above). Pulling tight on other side (bottom)

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4 Ribs

Very happy !! Today I put the 2 ribs on each of the two wings closest to the “lift” and “landing” cables. I wanted these as close as possible, for a good reason…
OK will explain: Where the steel cables go through the “skin” of the wing, I will have a piece of aluminium sheet, with some leather to create a nice “seal”. The fabric on the wing will be glue-ed on the alu sheet.

Just had the two wings on the plane like you see above, to check how the strings (for now) go past the ribs. And yes it all works out really well.

So now I have these 2 ribs on each wing, I can finish each wing on the bench in the garage:

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Might not be that obvious, but the front bracket of these two ribs are different from the other ones, see below. This is to make room for the landing cables going “through” the front of the rib.

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Done more ribs

Did a few more ribs !! Getting there ๐Ÿ™‚ If you look well you see that every second rib has no full bottom tube, just a little piece, to shape the first part of the curved bottom side. The remainder of the bottom is almost flat.

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All but one rib done

Yesterday added a few ribs, and today added the last (except for one). Spend most time today to finish the rib closest to the fuselage. This one has got extra stiff pieces of aluminium as the fabric would otherwise pull it away from the fuselage (see below) when it (fabric) gets installed.

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The very last rib to do, is one that wasn’t supplied, so will be adding myself. This rib will be shorter and thinner as it is part of the round tip of the wing, see image on Fri 18 Jul 2014.

The back of this rib will end at the very end of the back spar, shown in the bottom left of the photo below.ย The front of that rib will be slightly shorter as the other ribs as well, because the leading edge is curving there already.

In about a week after I have “copied” the right wing to the same state as the left wing I will start with the leading and trailing tubes, and the nice curved tube for the wing tip. After that I will create the last rib as just described and attach it to the leading and trailing tubes ! ๐Ÿ™‚

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Speed gauge in car

Drove to work today with a bit of tube sticking out of the window attached to some bamboo, measuring the airspeed. Making sure the tube works before it goes into the wing ๐Ÿ™‚
Works great if there is no traffic. But it’s very erratic with car’s in front of you, even when they are 100m ahead !!!!

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Started half ribs

Started with the half ribs last night and finished them this morning before going to work ๐Ÿ™‚

So almost at the same stage as the left wing, only the very first one, closest to fuselage, to do. This is the reinforced one, so it doesn’t get pulled away when the fabric goes on.ย After that it’s fitting leading and trailing tubes !!!!!!!!!!!!!!!!

Finished right wing

Yesterday I finished the right wing, or should say got it to the same state as the left wing you see above. Here some detail photos:

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Today I could only work for an hour on it ๐Ÿ™

I started with the leading edge tube. Should make a photo about that bit tomorrow. I had the use the file to make it fit better, as the ends of the ribs were not all in the same line. Then started drilling holes in the strips of aluminium used for attaching the tube to the ribs. OK more photo’s are required here I think !!!

Trailing edge

Yesterday 2 hours and today 5 hours on the left wing. Aileron and wing tip left to do. Below a few more pics. Started the trailing tube on the right wing now, going well ๐Ÿ™‚

Hopefully next weekend I can start on the ailerons. That means making a whole lot of ribs from sheet material ๐Ÿ™

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Above you see the fuselage end of the left wing. The two spars stick out 2″. This will result in a 2″ gap between wing and fuselage.

The leading edge tube sticks out 2″ as well. I have done this so the tube for the Pitot tube (for measuring the air speed) can “get” into the fuselage nicely. The leading edge tube is also used for the wiring of my wing tip lights. Not sure when that will be as they are a bit on the expensive side.

On the left, on the trailing tube you see 4 hinges hold in place with some black tape for now. These hinges are for the ailerons.

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Above the left wing tip. Here a thinner tube will start from the leading edge tube, and will bend nicely “through” the front spar, to the back, “through” the back spar, and “into” the ailerons. That will be an interesting exercise.ย After this “perimeter tube is done, I will start on the last rib.ย You can just see the two markings for the position of that last rib on the front spar. That rib will have the same shape as the other ones but will be thinner and shorter.

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Happy with this wing so far !!!

More work on the right wing tomorrow hopefully ๐Ÿ™‚

Starting the ailerons

Started working on the ailerons today !

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Left you see the front tube of the aileron, attached with hinges (see above).

The aileron tube, is a bit longer than the spar tubes, sticking into the fuselage, where a lever will be moving the aileron up and down.

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At the wing tip, the curve will go “into” the aileron, but more on this once the ailerons are done…..

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The front aileron tube is 1″ and the trailing tube is 1/2″, thats why is shaped this way…

Bending all but two of the aileron ribs. The last two will be a bit shorter, so will do that when the wing tip is done.

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Holes in ribs

Started drilling holes in the first two ribs. Drilled the holes a fraction smaller than the final size, probably to be on the safe side as its not easy to drill exactly in the middle and I don’t want to damage the side of the rib with the drill. Especially with the 1″ hole where I am using a 7/8″ timber “hole saw”, that one always cuts a bit rough.

I think I am better of using a file to finish it, then going wrong in the process drilling. I only need to do half the hole as I am cutting away the “outside” of the hole. Will show you tomorrow !!!!

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Wingtip design

Made a few more ribs yesterday, but for today I decided that I have to create the wing tip first before finishing the aileron. Made a full scale drawing of the wing tip I found a little while ago (see Fri 18 Jul).
Cutting the ends of the spars and getting ready for bending the tube ๐Ÿ™‚

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Start wing tip

Started bending the outer tube that forms the wing tip. Finished creating it in 2 dimensions (flat on the ground) so now I need to give it the same shape as the rib, looking sideways at a cross section of the wing (rib). I will make it so it sits in the middle, between the top and bottom tube of the rib. That’s a bit harder to do…….

Mounted wingtip

Spend a few hours last Saturday using a tube bender, creating the 3rd dimension in the wing tip. When you see it , it looks horrible, but when in place its great.
Today I mounted the wing tip on the left wing.

Doesn’t look that great from here, will have to make another photo tomorrow from the back of the wing ๐Ÿ™‚

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Below the wing tip seen from “here” ย ๐Ÿ™‚

And I just started to make the last rib. This will be shorter and thinner than all the other ones. Show you tomorrow.1410854370

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Tip of aileron

Started with the aileron today. First the tip of it, see below….

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And then there was an aileron !! ๐Ÿ™‚

Also today I started with the wing tip of the right wing. That’s almost done now.

My wife was impressed !!!! when she saw the wing as you see below !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

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Right wing tip

Friday I started with the right wing tip, and today I finished that including the extra rib. So now the right wing is complete except for the aileron.
Have started with the “tip” of the aileron, so next thing is getting all the ribs ready.

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Ribs for aileron done

This week I prepared all the ribs for the aileron, and today I positioned them on the 1″ tube. Also bend the 1/2″ tube, the trailing edge tube, to create the nice rounding at the tip and riveted that to the junction with the 1″ tube.
So now the aileron is ready for riveting, to connect all the ribs to the aileron tubes. Should be done tomorrow ๐Ÿ™‚

Pitot tubes

Today I did the first of two Pitot tubes. I can hear you say two?? Why?ย Might in the future add another speed measuring device…

First I created a little gusset plate, to go to one side of the of the tip of the 8th rib. Drilled a 1/4″ hole through the leading edge tube.ย Riveted the gusset plate to the rib. Bend the Pitot tube, positioned it between two rivets (sticking out this way) so it can’t go forward or backwards and finally used stainless steel locking wire to lock it in position. The locking wire is something I came up with at the last moment. I was going to create a little strip of aluminium shape it around the tube and rived it, but that was going to be to hard…..

Happy with the result !

Oh yes, the Pitot tube is just some aluminium 1/4″ 5052-0 tube, softer then all the other tubes, really easy to bend.

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Step support getting there

I bend two brackets from 5″ * 4″ sheet material, rivet these to a flat piece 5″ * 6″. This whole thing is then riveted into the front !!! and back !!! of the spar.

Note that you can’t drill into top or bottom of the spar but just a few holes into the front or back is OK.

Only need to glue a 8mm piece of foam to it and another piece of Alu sheet on top again, making it just a bit thinner then the 1/2″ tube of the rib…..

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Rigging wings

Today I started rigging up the wings. YES !!!!!

Starting with the static cables, the ones that carry the wing when the plane is “static”, not flying ๐Ÿ™‚

First I had to find a place in front of the garage that was level so with the “spirit level” moved around a bit until I found the spot. Then I lifted up the tail until the two spars were in the same horizontal level. This way I can install and adjust the cables and make the tip of the wing horizontal as well, so no twist in the wing.

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Working on the last cable of the left wing. Going really well ! Getting the cable up tension, well a little bit with one of those tie downs straps, I think you call them.

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Now, one thing you see here, that might look a bit strange is bits of leather on the cable. The plan is to make a cable entry point with a bit of aluminium sheet. The fabric will be glued to this, creating an entry point for the cable.ย This aluminium will have a hole in there for the cable, maybe 1″ in diameter, and behind the hole I will have this leather, as a flexible bit of material, “sealing” the hole, so I don’t end up with a hole in the wing.

It will look good and probably will help in the “lift capabilities” of the wing. As lift is created by the air pressure difference between the top and the bottom of the wing. This way there won’t be air leaking from the bottom to the top surface of the wing through these holes.

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Here you can see again what I did early on with the bracket for this rib. I tilted it a bit so there was room for the cable !

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And this is what it looks like now, the left wing static wires done.ย Will do the right wing tomorrow !!!!

Beautiful sky by the way ๐Ÿ™‚

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Al static cables done

Today I finished the other 4 static cables for the right wing.

After that was done, I did a little Wooo Hooo !!!

Looks great seeing the Bleriot with its wings just standing there. No more ladders to support the wings ๐Ÿ™‚

I sat in it for a while enjoying the view …….

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Was seen by the local photographer, dreaming……

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Cable entry

Started measuring the distance from where the steel cables enter the wing to the closest rib so I can start making the bits of aluminium that get riveted to the ribs that I mentioned earlier when I was explaining the leather.

Cable entry started

Today I started with the bits of aluminium sheet creating the entry for the cable into the wings. Once the fabric has been glued on and shrink-ed, the leather will be glued on top and another bit of fabric on top of that to protect the leather…..

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Preparations for flying wires

Started the preparations for the flying wires. The 4 tangs that the front flying cable turn buckles connect to are not long enough. The are mounted on the same bolt, resulting in the ends of them being to close together. So now making new ones that are a bit longer and uneven in length so it should be easy to count the turnbuckles.

Also the four tangs on the support structure for the back four flying cables are new ones.ย Cut them all to length, drilled the holes and marked the rounded edges, so I can grind them nicely into shape tomorrow at work.ย Also cut 8 more pieces of leather, for covering the holes at the entry into the wing.

8 Flying cables

Made the new tangs, and installed them:

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And did the 8 flying cables today ๐Ÿ™‚ !!!!! Tomorrow the entry gusset plate for all 8 cables…….

Getting very close to starting with the fabric for covering the wings, rudder, elevator and part of the fuselage

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If you look closely, you can see I have done another “Gert” today. With the flying wires, basically carrying me and the plane while flying, I wanted to be super secure. I used 2 crimps at the ends of the wires. Adds a tiny little bit of weight but gives me the a very secure connection ๐Ÿ™‚ I like that !!

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Last bits on wings

Oh my birthday today, happy birthday me ! ๐Ÿ™‚

Yesterday and today I finished the last, yes the last bits of the wings. When the fabric goes on, the two 2″ tubes sticking out connecting the wing to the fuselage, will go through the fabric. So basically I will be making two 2″ holes in the fabric. If I would not do anything to support the holes in the fabric, it would tear over time. So this here will allow me to glue the fabric around the hole to some aluminium. I used some left over bits ๐Ÿ™‚

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Last few fixes

Evan asked me to put some tubing around the cables to stop them from rubbing against each other and against the inside of some of the ribs:

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He also wanted some rust protection on the tangs in the wings:

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Filling in wing root gab

Spend some time this weekend filling in the gab between the wing and the fuselage. There is a 2″ gab, maybe historical, but probably for technical reasons, as it was easier that way.

The reason I am trying this is to see if filling this gab increases the lift and decreases the drag.

Normally at the wing tip you have air “leaking” from the bottom of the wing were there’s a higher air pressure to the top of the wing were the air pressure is lower. In modern planes they minimize that with all sort of shaped wiglets at the tip of the wing.

In my case I can’t stop this “leak”. But I am sure I have the same leak at the wing root, and that’s what I am stopping and it should improve things. Not sure how I am going to prove it works as I am also in the process of improving the engine performance, so this gab filler, a piece of foam in the shape of the wing is probably always going to stay there, so one day will paint it the same colour as the wing.