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Phil's F-86 Sabre build thread

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Phil Cooke09/02/2020 12:30:23
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2592 forum posts
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Dirk I just thought there is nothing stopping us building a seat onto the formers front and rear faces as needed to ensure a deeper seat in exactly the right place. Make a seat up, ‘slot’ it to take the 1/8” former and slide it down into position.

dirk tinck09/02/2020 12:44:26
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628 forum posts
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Good thinking Phil ,making the former part of the seat...

Phil Cooke09/02/2020 12:54:30
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thumbs upbeer

Phil Cooke09/02/2020 20:19:56
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So the 2 fuselage halves came away from the building board today and after re-enforcing some of the key joints around the wing box with a smear fillet of epoxy I offered the 2 sides together to check alignment.

Not too bad, the extreme nose and tail both curl outwards a little (~1/8" under the residual stress of some of the tighter planking rads no doubt, but this will easily pull in when the halves are clamped and glued. Certainly all the formers were well aligned and true, so that was a win - although I did have to file back the top mating faces of F3 and F4 a little (maybe 1/32" to get their neighboring formers to seat better.

planking 5.jpg

I trimmed the front and back overhangs closer to F1 and F10 and then set about removing the central area of F6 - which I needed to do to allow the torque rods to work freely on the wing - easier to cut this out now before the halves are joined.

former f6.jpg

I removed the shaded area, easy with a Dremel and a permagrit file.

former f6 2.jpg

Andrew Edmead09/02/2020 21:55:24
57 forum posts
50 photos

Your planking Looks so much neater than mine, I got glue everywhere!

Andy Meade10/02/2020 15:38:35
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2772 forum posts
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Phil's planking is always neater than everyone's laugh

We think he's a Prize Planker wink

Edited By Andy Meade on 10/02/2020 15:47:13

Andy Meade10/02/2020 17:12:52
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2772 forum posts
717 photos

An afternoon off at home with a poorly dog produces this, a seat for an F86. Let me know if anyone wants one printed, even just the top half for those not committed to a full depth proper scale aircraft (Phil) laugh

f86 ejector seat cropped.jpg

Mark Kettle 110/02/2020 17:13:42
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2544 forum posts
1568 photos

laughlaughlaugh.

Phil Cooke10/02/2020 19:57:10
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2592 forum posts
1824 photos

I need to point out where to draw the line, both for the half depth seat, and your humour...

Andy Meade10/02/2020 20:05:42
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2772 forum posts
717 photos

Jones made me do it!

Dallas Crisp10/02/2020 23:20:53
11 forum posts

Great forum would be lost without it. Yes thanks, would love a copy of the seat top half. Thanks.

Phil Cooke15/02/2020 23:01:52
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2592 forum posts
1824 photos

Hey Dallas - great to see you on the forum! thumbs up

So I finally got to join the fuselage halves today... final dry checking proved everything aligned pretty well with some minor bow to combat with clamps between F1-F2 at the nose and F9-F10 at the tail. I gave each side a reasonable coating of PVA and aligned them by hand, best fitting any minor mismatch whilst ensuring F4 (as a main datum) was as true as possible. Once clamped all round, along top and bottom spines from front to back, I left it to dry in the vertical.

fus join 1.jpg

One issue I did note was that the wing mounting plate seemed to 'float' a little between the 2 F14 formers - as if the fuselage was a couple of mm too fat around the wing seat - but the 2 halves of F7 at the rear of the mount were butt-jointed on the centreline - so all I did was centrally float the plate in its mounts leaving a 1.5mm gap each side. This would need reinforcing with triangular stock once dry.

fus join 4.jpg

Phil Cooke15/02/2020 23:07:52
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2592 forum posts
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Whilst that was all drying I made up a simple jig from a sheet of white polystyrene foam and some scrap 2.5" x 1.5" timber. The recesses were sized and shaped to accept the fus at F2 and F8. This will help me handle the fuselage whilst I'm finishing the top and bottom planking and mounting the tail - it will also act as a useful transport aid in weeks to come!

fus join 2.jpg

Phil Cooke15/02/2020 23:10:49
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2592 forum posts
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The battery box was added (with the majority of F6 removed from the wing bay (for aileron torque rod clearance) it meant I could insert and glue the battery box in after I'd joined the fuselage halves - which made things a little simpler.

fus join 3.jpg

Phil Cooke15/02/2020 23:14:10
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2592 forum posts
1824 photos

Triangular stock was added top and bottom between the wing mounting plate and F14 each side to bolster the floating joint.

fus join 5.jpg

fus join 6.jpg

So with that all done we have to return to more planking top and bottom frown - I will be sheeting as much of the underside as possible where the curvature is minimal.

fus join 7.jpg

McG 696915/02/2020 23:33:35
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3248 forum posts
1233 photos

Nice progress, Phil.

Regarding the wing plate, I had exactly the same, but I thought I had been 'oversanding' it myself.

No panic involved as it was, like yours, very floaty laterally.

I just made a couple of small fillets of epoxy and micro-balloons to properly fill the gaps.

By the way, I noticed that you prepared your wing bolts and blind nuts already. I must admit that I still don't understand the involved sequence to bring the wing correctly to the fuselage.  surprise

Cheers

Chris

 

Edited By McG 6969 on 15/02/2020 23:35:11

Phil Cooke16/02/2020 08:47:52
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2592 forum posts
1824 photos

Chris - Dirk has covered this well in his build blog - its the trimming of the fuselage sides to the correct profile thats the tricky bit I think allowing for dihedral and a the thickness of any wing seat/fillet material... a job for another day wink

The dowel holes are pre-set in F4 and I just read the position of the captive nuts off the plan - I will have to make the wing suit the fuselage now with those final details, but only once its 'sat' correctly in the wing saddle. Dirks recommendation again was to glass the wing before any of this takes place due to the amount of handling involved - all makes sense. So many jobs still to do...

img_2012.jpg

McG 696916/02/2020 18:58:29
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3248 forum posts
1233 photos

Thanks Phil,

I understood Dirk's method allowing for the dihedral of the wing, but my point was how to make sure the dowels will correspond at the front and the same for the bolts at the TE.

That part is still quite 'misty' for me...

Cheers & thanks again.

Chris

Martin Gay17/02/2020 12:24:43
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396 forum posts
255 photos

Phil/Martin,

If you have not yet planked the bottom of the fuselage, you can access the dowel holes in F4 with a short pencil or a small dowel with the end inked. These will mark the dowel positions onto the wing.

Failing that you could use a pair of dowel centre pins from amazon:

**LINK**

dowel pins.jpg

Andrew Edmead17/02/2020 18:10:44
57 forum posts
50 photos

Hi Phil I’ve been following your blog as we are at similar stages of the build. I’ve read Martin’s gamma blog, and he said before joining the fuz halves you need to do the battery box, wing bolt plate and bell crank. I understand how you’ve been able to omit the box at this stage but you didn’t mention the bell crank for the elevator. Can I leave the bell crank until after joining or are you doing something different?

hope that makes sense

Andy

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