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Chris McG F-86 Sabre Dog build blog

my first attempt to a soaring bird for the PSSA MB 2020?

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David Sack23/09/2020 13:57:16
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45 forum posts
46 photos

Good question Chris .. 'Are sidewinders a therapeutic solution for loss of MOJO?'

fj-3 with sidewinder close up.jpg

......... OH YES !

For the model I used a blob of epoxy resin to provide the 'lens' the first results are encouraging ! And while my model may never look as good as the plane in this pic its darned good fun putting it together and those Sidewinders are REALLY good for my MOJO

Regards to both Iris and yourself and of course to Gaston.

McG 696924/09/2020 19:43:10
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3417 forum posts
1299 photos

Hello again,

Glad to be able to confirm that the ‘dowel center pins’ were - nearly - worth the investment. wink

Piece of cake to get a correct ‘inprint’ with the wing sitting perfectly on both F14 ply guides, a bit of drilling and later on installing/gluing both dowels.

1558_dowels installed_900.jpg

With my attention drawn to that area, I started wondering about a way to keep the cells pack at the front of the battery box. They're not supposed to travel around, are they?

After a bit of online checking, the different build blogs didn’t propose a ready-to-go solution. Everybody seems to keep it as a ‘Classified’ secret… frown

Not having Sidewinders to build as a ‘mojo therapy’, I decided to have a small door keeping a foam block pressed against the battery cells at the front.

1561_batterybox_lid_900.jpg

1567_batterybox_lid.jpg

Two carbon mini rods and a small latch is all it needed. The junk lite ply - from a French Pyrenean Goat cheese tray - has been covered with some off-cuts of glass cloth, hence the slightly darker colour.

Hakuna matata & stay careful all

Chris

BRU - BE / CTR French Cheese Control

Phil Cooke24/09/2020 23:15:09
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2655 forum posts
1851 photos

Lovely neat building Chris, and some nice robust engineering with your little battery cover!

Flyer25/09/2020 08:29:19
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638 forum posts
109 photos

Nice , neat solution Chris.

Looking good!

regards

Ade smile d

McG 696925/09/2020 18:20:31
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3417 forum posts
1299 photos

Thanks both for visiting and commenting, gents.

I wanted to make it strong enough to keep the cells in place, but then not overly heavy although it is way up front of the CG.

The Dog, with its 'fat' general dimensions, will be heavy enough compared to a standard Sabre. So if anybody has a 'lighter' solution, they're mostly welcome. yes

With the dowels completely cured, I had a first move on getting the wing in place within the fuselage.

Pics to follow when that sequence is properly dry.

@ Ade > don't forget your predictions for the Russian GP... wink

Cheers & stay cool

Chris

Iris Vlieghe25/09/2020 20:57:44
82 forum posts
3 photos
Posted by john stones 1 on 23/09/2020 00:44:02:

Been busy of late, not missed a post yet though, i'm expecting a top class paint job on this, don't let me down.

Hope Iris n the little fella are well. heart

Thank you for the kind wishes John. As Chris mentioned very busy with work and if not work with my hobby (drawing). Don't forget your predictions for the Russian GP... smiley

Chris, keep up the good work and if you see Gaston, say hello to him from me... I kind a miss him! Don't take it the wrong way, I am sure that what you are writing here is innovating en full of useful information, but as you know I am far from technical and I just love watching your pictures. They are even better with Gaston in it.

Keep on building!

Hakuna mata,

Iris

BRU - BE/ CTR Cheers Control

john stones 125/09/2020 22:05:01
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11702 forum posts
1517 photos

My pleasure Iris, dogs done the predictions, growls if I try to do them, he's not wrong. winkdog

McG 696926/09/2020 19:58:57
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3417 forum posts
1299 photos

Thanks for your kind comments, my dear. And, of course, you too, John. yes

As the Russian GP quali was quite early today, I had a session at La Grotte afterwards.

Finalizing the wing/fuselage joining with the help of a Kevlar thread pinned at F10 and a small weight to keep it equally tensioned at the LE of rib R13 on both sides.

I must be lucky here but my measurements were within 0,3mm. Close enough for me, I guess.

1573_wingfixing01_900.jpg

I left the pentagonal ply 10mm deeper as to include the wing part and not only the TE stock.

IIRC, Phil did it this way, but Dirk did the other way around, having the trapezoidal part at the bottom of the wing… I don’t think it really matters??? Does it?

1576_wingfixing02_900.jpg

Probably a very ‘common’ step for most of the builders, but for me, joining the wing to the fuse was a real milestone in my Dog build. smiley

Hakuna matata & stay safe all

Chris

BRU - BE / CTR Alignment Control

David Sack26/09/2020 22:02:30
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45 forum posts
46 photos

Very tidy indeed Sir ! I shall copy that, with your permission

Phil Cooke26/09/2020 22:04:26
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2655 forum posts
1851 photos

Fitting the wing to the fuselage for the first time in any build is always a major milestone! Even if you work for Boeing or Airbus!

Looks great btw... thumbs up

McG 696927/09/2020 18:33:37
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3417 forum posts
1299 photos

Thank you both, gents. yes

Of course you can use what ever you desire, David. But of course, it's completely at your own risk. No warranty involved whatsoever... wink

Well, I'm not the only one then, Phil. But you're right, I remember now the same kind of feeling I had when I installed my Ultralight Storch wing including the controls - ailerons/flaperons - the first time ever...

Cheers

Chris

McG 696928/09/2020 19:13:37
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3417 forum posts
1299 photos

Hi to all,

Time to build-up that belly pan, then.

First thing that scared me a bit was referring to Phil’s measurements with 90mm at the front and 100mm at the back. Totally fine at the front with 92mm, but I had nearly 112mm at the back… surprise

Sjeesh… where did it went wrong? What did I do?

Nothing, in fact. I only forgot that I enlarged my fuse formers starting ‘heavily’ at the TE of the wing… Panic session over… smiley

1580_bellypan01_900.jpg

I split the first layer in two sections along the centerline, bevelling the center join slightly to conform with the dihedral of the wing.

I used Deluxe Superphatic here as it is very thin, adheres perfectly to glass epoxy and cures quite quickly.

This allowed to continue the layering of the belly. Having a lot of balsa off-cuts since I started the Dog, I opted to use those for the sake of the possible forthcoming balsa ‘problem’.

1594_bellypan03_900.jpg

Quite a time since I had a proper Graupner hedgehog anyhow. But now a bit of a sanding session awaiting again… frown

Hakuna matata & stay cool all

Chris

BRU - BE / CTR Cut-Offs Control

McG 696930/09/2020 18:29:32
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3417 forum posts
1299 photos

Hello there,

With the pins removed, I had a better view of what was next.

As the back of the belly pan is quite thick, I thought of having the wing screws’ heads ‘buried’ in.

With a drill-through from the top and a hand powered flat wood drill from the bottom, it was easy to get down to the original ply plate.

1596_bellypan04_900.jpg

I guess it will not only protect the screw heads from the ground, but will supposedly offer a ‘cleaner’ view of the Dog’s belly when/if ever it gets airborne. wink

I wanted to have a first rough sanding allowing for a better idea of the shape of the fairings to be done later on.

1602_bellypan06_900.jpg

Even without squinting too much, I thought that it was looking a lot like the face of Lion King… surprise

But then the balsa dust might have possibly reached my already senile neurons…

Hakuna matata & stay fine all

Chris

BRU - BE / CTR Dog King Control

Martian30/09/2020 21:22:49
2614 forum posts
1237 photos

You really do some beautiful tidy work Chris 👽 and yes I can see the lion king to.

john stones 130/09/2020 22:53:20
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11702 forum posts
1517 photos

Looks like a Saxon warrior to me, nose guard n a beard, Ethlered.

Skip01/10/2020 10:43:47
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12 forum posts
18 photos

Thanks for the detail on the battery box latch Chris (and all the other stuff!). I was also wondering what people have been doing to secure their batteries.

Re your comment about lack of blog activity, I'm new to this so haven't wanted to create unnecessary repetition in my blog or unwanted comments/questions in other's blogs. Still trying to work out the protocols...

Craig

McG 696901/10/2020 19:19:40
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3417 forum posts
1299 photos

Thank you for commenting, gents.

Glad someone else sees the Lion as well, Martian. wink

My first pic looks indeed like sporting a nose guard, John.

Could it be that J.R.Kipling was a descendant of the Wessex Kings dynasty some moons ago??? ... surprise

You're mostly welcome, Craig. For the latch info or for comments/questions in this thread.

That's what a Mass build is all about, I thought. I can only regret that many builders stopped very early with their thread or even never started one... sad

No progress to the Dog though as Iris is having some issues concerning the US 're-organisation' of her job. And the Lady needs some support at the moment.

Cheers

Chris

McG 696903/10/2020 18:34:54
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3417 forum posts
1299 photos

Hello again,

Beside assisting the LotH with her employment issues, I went to have a go at the wing seat.

I opened up the gap from wing to fuselage side following Dirks method of 'gradual' sanding back till I got an opening of 3mm.

After Sellotaping the wing, I filled up the gap with a 3mm wet 'stringer', let it dry and glued it in.

The Dog - of course - has very different fillets/fairings at the wing seat than the standard F-86. In fact there are less fairings along the wing seat with quite smaller ones at the TE.

I guess I'll just have to sleep on it before attacking the other side... indecision

Hakuna matata & stay safe please

Chris

BRU -BE / CTR Seating Control

McG 696904/10/2020 18:06:32
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3417 forum posts
1299 photos

Hi to all still there,

After a night of pondering, I thought of just going ahead with the second fuse side as I need to reinforce that part of the fuselage anyhow.

I might be regretting later that I didn’t use a thin ply layer for the wing seat before building up the gap. The Great Flyer knows, but unfortunately, I don’t… blush

When the fuselage sides are joined to both F14s and the fairings added, the plan is to glass it all in one go with the fuse halves. I expect it will give it sufficient strength after that. Fingers crossed… indecision

Sorry, but no pics as the camera is in better hands at the moment.

Hakuna matata & stay careful please

Chris

BRU - BE / CTR Crossing Fingers Control

Iris Vlieghe04/10/2020 22:29:09
82 forum posts
3 photos
Posted by McG 6969 on 03/10/2020 18:34:54:

Hello again,

Beside assisting the LotH with her employment issues, I went to have a go at the wing seat.

I opened up the gap from wing to fuselage side following Dirks method of 'gradual' sanding back till I got an opening of 3mm.

After Sellotaping the wing, I filled up the gap with a 3mm wet 'stringer', let it dry and glued it in.

The Dog - of course - has very different fillets/fairings at the wing seat than the standard F-86. In fact there are less fairings along the wing seat with quite smaller ones at the TE.

I guess I'll just have to sleep on it before attacking the other side... indecision

Hakuna matata & stay safe please

Chris

BRU -BE / CTR Seating Control

The LoTH is thanking you a lot for your help heart

I also see the lion. But then again, I see lots of things all over the place...

My sound system on my desk looks like a guy staring at me with open mouth hahaha....

This being said, great job Chris!

I am like Falty Towers Manuel from Barcelona: "I know nothing"... about building model planes but I know you and as usual, your approach is well thought of and worked out until the tiniest detail... I know I sometimes tease you with this 'authistic' approach as I call it, but let's face it, sometimes I wish I would be a bit more like you...

Keep up the good work!

Hakuna and LoT(h)s more,

- Iris

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