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Own Design 2m F3A Model

2m f3a model for 2018 season

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Dan Workman13/02/2018 09:49:41
31 forum posts
76 photos
Lots of planking.
I use 10mm strips of soft balsa, it takes ages but there isnt really any other way as its a compound curve.
You can just about see in one of the photos the top half of the nose. The bottom was really hard
Bob Cotsford13/02/2018 09:56:05
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7161 forum posts
405 photos

How thick is the planking Dan? In some of the photos where the light is shining through the wood it looks like light 1/16"!

Dan Workman13/02/2018 10:08:09
31 forum posts
76 photos
3/32" all over. But it will be thinner in parts due to sanding. I've used this before and seems strong enough

Dan
Nigel R13/02/2018 10:19:45
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1145 forum posts
258 photos

Dan, what CAD are you using to do the fuse formers and shape?

Dan Workman13/02/2018 16:20:42
31 forum posts
76 photos

Hi Nigel i use Turbocad 18, bought it off ebay a few years ago. Not the most recent one but works for me.

Nigel R13/02/2018 16:33:39
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1145 forum posts
258 photos

Thanks Dan. Do you find it works well to do the interlocking / lattice type stuff on the formers?

Dan Workman13/02/2018 16:35:05
31 forum posts
76 photos

Pretty much there with the fuselage. With not much else to go on the fuz it comes in at 912g, pretty happy with that.

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Dan Workman13/02/2018 16:58:41
31 forum posts
76 photos
Yes Nigel when its all interlocking you can pretty much assemble it without glue to check it all fits and is square, then you can run round with thin cyano.
Nigel R13/02/2018 17:42:26
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1145 forum posts
258 photos

Weight sounds good. I find the raw wood weight of a fuse often works out around 20-25% of final AUW, I don't know if that holds true on a current style F3A.

Dan Workman13/02/2018 19:02:08
31 forum posts
76 photos

Im aiming for about 4750g including lipos so its not too far off

Start of the wing cradle and basic wing structure

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cymaz13/02/2018 20:08:58
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7531 forum posts
975 photos

That’s a clever way of building a wing. Any more pictures of this?

Dan Workman15/02/2018 17:41:48
31 forum posts
76 photos

Unfortunately i damaged my phone with a load of pics on, especially the sheeting part. Before i did sheet it though, i couldnt resist getting a look with the wings on the fuz..

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Phil 915/02/2018 18:22:55
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4208 forum posts
198 photos

can you tell me where you got your wing tubes from

Dan Workman15/02/2018 18:56:46
31 forum posts
76 photos
F3a unlimited
Gary Manuel15/02/2018 19:59:37
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1500 forum posts
1353 photos

Wings look a bit short, but I'm sure they're not.

How close to 2m are the wingspan and fuselage length?

Edited By Gary Manuel on 15/02/2018 20:25:37

Gary Manuel15/02/2018 20:26:55
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1500 forum posts
1353 photos

Are ribs R4 doubled up at the trailing edge where you are going to separate the ailerons from the wings?

Looks like it needs a triangular piece adding to the end of the aileron.

Edit - No criticism intended. I'm fascinated by this design / build.

Edited By Gary Manuel on 15/02/2018 20:37:59

Dan Workman15/02/2018 21:04:53
31 forum posts
76 photos
Hi Gary, the fuz is bang on 2m, you could even go 2.02m as you get a 1% measuring tolerance.
The wings are never usually 2m, the norm is about 1750mm to 1800mm.

Your right there is a wing tip to go on.

I didnt double up the ribs, i just sanded the end of the aileron to take some 3/32" balsa and give a 1mm gap. I've finished 1 wing now, going to do the other tonight i'll take some pics.

Dan
Nigel R19/02/2018 18:01:01
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1145 forum posts
258 photos

Looking good Dan.

I like the cradle. I guess that is quite easy to do with CAD, drop a line a fixed distance from the rib centrelines and you're almost there with the female part?

Dan Workman20/02/2018 00:55:46
31 forum posts
76 photos
Yes Nigel as simple as that. It makes the wings and tail very easy to build.
I started the tail tonight and got some pics, also some pics of the wings. I'll try and get them up soon
Dan Workman20/02/2018 20:46:06
31 forum posts
76 photos

Few pics of finishing the wings, pretty pleased how they've come out. Nice and straight and light. Only snag is ones a bit heavier than the other, not quite sure how that happened but hey.. They're 225g and 245g ready to cover.

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