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Design & Build Sport Twin

Sport Aerobat for 2 x 40s

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Nigel R22/09/2019 06:50:50
3048 forum posts
475 photos

Some progress. Covering now half way done:


At this point I discover a 5m roll is not going to be enough! sad

Chris Freeman 325/09/2019 09:18:24
258 forum posts
325 photos

Looking good Nigel, the worst is over. I found the wing a real pain to cover.

Jon - Laser Engines25/09/2019 09:43:55
4791 forum posts
179 photos

for some reason i have not kept up with this thread. The model is looking great and should be a blast to fly. DOnt be worried about loosing an engine, just tune each to max rpm that it is happy with an then forget it. Usually engines to rich in flight but of one starts to sag a bit then when you land just open the needle a click and try it again. Dont worry if the tuning is a bit out on the ground as it will be correct in the air. My old twin ace was like that as the 25fp's were nowhere near eachother on the ground but came on song in the air once up to full temperature.

I would also recommend against the cut and glide. Twins are too heavy for this work well and you still have a perfectly healthy engine to carry you along. Just fly flat out and dont slow down using rudder to correct for yaw. Its not as tricky as is often made out.

I lost an engine on my twin at wings n wheels but was able to do a perfectly acceptable landing even with the cross wind...although to be fair, i was quite smug about it!

Mark Elen03/10/2019 22:37:04
387 forum posts
697 photos

Hi Nigel,

I have been watching your build with great interest. Beautiful neat and precise build. I will be interested to see how you get on with the set up/flying as I have plans for a Grumman Cougar that is getting further up my build list.

Keep up the good work



Nigel R04/10/2019 08:36:57
3048 forum posts
475 photos

Many thanks gents. Yes, looking forward to getting it airbourne now.

No photos of the last nights progress, but, the covering is proceeding nicely - the fuselage is covered and the only thing left to cover is the nose cone. I had about three feet of hobbyking white film left over from my last build and that has made up the shortfall I discovered upon completion of the wing. All told it has taken nearly twenty hours to get the film on! And of course I still have the trim strips and sunburst or similar to finish it off after that.

I'm starting to wonder if it might have been quicker or easier to do a dope and tissue, or poly-c and glass type finish. Film is pretty good at big flat panels, like regular wings, and simple boxy shapes like a Stik, but with lots of corners and curves and so on, it starts becoming much slower and trickier to get a nice finish.

Edited By Nigel R on 04/10/2019 08:43:38

Nigel R05/10/2019 10:45:59
3048 forum posts
475 photos


Nigel R05/10/2019 10:46:59
3048 forum posts
475 photos

Film done! Starting to get controls glued on now before doing the coloured trim.

Denis Watkins05/10/2019 11:02:56
3875 forum posts
58 photos

" When it looks right, it is right "

That is so going to fly Nigel

Spectacular work

cymaz05/10/2019 14:38:40
8649 forum posts
1175 photos

That’s a pretty shapelove

Paul Marsh05/10/2019 15:15:44
3703 forum posts
1050 photos

Looks like the Scorpian Twin I had years ago; there were two versions, think still have the red one in the attic - for 2 x .15 to .25 engines. the last one had 2 25's where the 15s were bit marginal...

Nigel R12/10/2019 21:55:14
3048 forum posts
475 photos

Thank you gents.

Paul it is quite similar and before starting this project I was fifty fifty on doing my own design or getting a twin scorpion.

Right then. A couple of hours on trim has got me thus far:


Getting there...

Bob Cotsford13/10/2019 11:02:18
7964 forum posts
439 photos

That's looking the mutt's nuts now Nigel. Can't help thinking what a nice electric model it would make with battery access through the nose devil

Mark Elen13/10/2019 18:03:59
387 forum posts
697 photos

Hi Nigel,

That looks beautiful mate. Well done. Don’t start thinking about the ‘dark side’ as Bob alludes to 😂😂😂



Nigel R13/10/2019 22:39:01
3048 forum posts
475 photos


Nigel R13/10/2019 22:43:57
3048 forum posts
475 photos

Last segment of the sunburst done. Appreciate the comments gentlemen.

No chance of going to the dark side for this one mark!

Although I could be convinced to re engine it one day with a pair of four strokes...

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