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SZD Cobra 17

Let us all watch your new project progress.
Jolly Roger
Posts: 389
Joined: 30 May 2015, 20:35
Location: Sutton Bank, North Yorkshire

Re: SZD Cobra 17

Post by Jolly Roger »

How exciting! Bet you can't wait for tomorrow morning. :)

Chris Bowles
Posts: 90
Joined: 18 Mar 2015, 16:12
Location: South Devon

Re: SZD Cobra 17

Post by Chris Bowles »

While I waited for the epoxy to fully cure on the wings, poor excuse, cut and shaped 1/4" ply to form the cockpit frame, this was glued in, then glassed, small magnets where glued in to retain the canopy, a piece of foam was shaped to form a mould for the tail wheel, glass cloth was wrapped the mould, when cured, the foam can be removed, leaving a nice housing for the tailwheel, and no muck going up into the fuz,
using my patio as a grid reference, the fuz was lined up, the wing joiner tube and wings fitted and lined up, using a piece of string taped to the fin, square tape measure and eye, when happy the tube was tacked in place, the wings removed, and the tube fully fixed, next the wing roots where placed over the wing tube,wings refixed, incidence checked, and the roots glued in place, then balsa and filler was placed in the gap
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Jolly Roger
Posts: 389
Joined: 30 May 2015, 20:35
Location: Sutton Bank, North Yorkshire

Re: SZD Cobra 17

Post by Jolly Roger »

It's coming along really nicely Chris. You've got a lovely finish in the fuselage.

roo Hawkins
Posts: 820
Joined: 18 Mar 2015, 20:12
Location: Northamptonshire

Re: SZD Cobra 17

Post by roo Hawkins »

what a fantastic looking job you are doing. looking nice. roo :D

Chris Bowles
Posts: 90
Joined: 18 Mar 2015, 16:12
Location: South Devon

Re: SZD Cobra 17

Post by Chris Bowles »

a bit more progress, have made the canopy frame, this was cut from 6mm ply, then 4x4mm ply was glued on the edge to give a larger glueing area, canopy cut, glued and painted, the canopy I used is for the 1/3 scale ASW15, also have made a retract unit, the full size came with a fixed wheel, but a retractable wheel was a option, have found that a fixed wheel model, can sometimes be a bit of a pain to store or transport, so went for the flat bottom version
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Barry_Cole
Posts: 1368
Joined: 10 Mar 2015, 09:30
Location: Hampshire UK

Re: SZD Cobra 17

Post by Barry_Cole »

Nice looking retract, but please use a servo that moves 180 degrees. Then there is no load on the servo at either end, and it will stay locked down much more reliably.

8-) 8-) 8-) 8-)

BC

Chris Bowles
Posts: 90
Joined: 18 Mar 2015, 16:12
Location: South Devon

Re: SZD Cobra 17

Post by Chris Bowles »

Hi Barry, the standard servo works just fine, with the retract locking in both up and down, being a homemade unit the movement will be different from a commercial one

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