SZD - 36 Cobra 15 1:3 scale

Let us all watch your new project progress.
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skyhawk92
Posts: 115
Joined: 20 Jan 2017, 06:47
Location: Domzale

Re: SZD - 36 Cobra 15 1:3 scale

Post by skyhawk92 » 26 Jan 2017, 07:49

That's it so far, both threads are equalized :) I will post on both from now on.

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Chris Jesshope
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Joined: 24 Jan 2017, 16:13
Location: Shropshire

Re: SZD - 36 Cobra 15 1:3 scale

Post by Chris Jesshope » 26 Jan 2017, 15:54

Skyhawk,

I have just been catching up with your thread. This technique is very interesting. You might like to know that it is also used in the construction of sailing yacht hulls, although I have typically seen cedar strip rather than balsa used and there and usually two or three layers laid up in different directions but that is used in a 10m structure that is going to hold 1 ton of keel! It results in a very light and strong structure.

keep up the good work!

Chris

skyhawk92
Posts: 115
Joined: 20 Jan 2017, 06:47
Location: Domzale

Re: SZD - 36 Cobra 15 1:3 scale

Post by skyhawk92 » 26 Jan 2017, 17:25

Chris Jesshope wrote:Skyhawk,

I have just been catching up with your thread. This technique is very interesting. You might like to know that it is also used in the construction of sailing yacht hulls, although I have typically seen cedar strip rather than balsa used and there and usually two or three layers laid up in different directions but that is used in a 10m structure that is going to hold 1 ton of keel! It results in a very light and strong structure.

keep up the good work!

Chris

Exactly :) that's where I got inspiration.

skyhawk92
Posts: 115
Joined: 20 Jan 2017, 06:47
Location: Domzale

Re: SZD - 36 Cobra 15 1:3 scale

Post by skyhawk92 » 30 Jan 2017, 07:18

Main thing about the wing construction are bottom shapes of the ribs. This type of construction is fast and accurate and allows to build each control surface separately.

Bottom part shapes of the ribs(jigs or how should I call them... ) are made of 3mm plywood and on top they are covered with tape to prevent anything to stick on them later. To hold them in place, I use pieces of aluminium profiles with M3 size screws. All holes must be on same level(in height).
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skyhawk92
Posts: 115
Joined: 20 Jan 2017, 06:47
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Re: SZD - 36 Cobra 15 1:3 scale

Post by skyhawk92 » 30 Jan 2017, 07:18

I build first 5 ribs of the left and right half of the wing and insert the main supporter and set the V angle.

Jigs set in place. Same are used for both halves, no need to use doubles.
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skyhawk92
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Re: SZD - 36 Cobra 15 1:3 scale

Post by skyhawk92 » 30 Jan 2017, 07:19

Putting ribs in place. First 5 of them are made of plywood.
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skyhawk92
Posts: 115
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Re: SZD - 36 Cobra 15 1:3 scale

Post by skyhawk92 » 30 Jan 2017, 07:19

Two plywood plates are glued in place where the supporter will be.
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skyhawk92
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Re: SZD - 36 Cobra 15 1:3 scale

Post by skyhawk92 » 01 Feb 2017, 07:07

Rear part of the ribs glued.
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skyhawk92
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Re: SZD - 36 Cobra 15 1:3 scale

Post by skyhawk92 » 01 Feb 2017, 07:07

Second part of the middle wing section and wing supporters glued.
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skyhawk92
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Re: SZD - 36 Cobra 15 1:3 scale

Post by skyhawk92 » 02 Feb 2017, 07:23

Rest of the wing being built.
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