Not a terrible idea, but I'm betting 10 bucks that Tony here has never built and/or flown a Challenger .15.
Well WWWarbird, I did checkout the specs on the Challenger .15. First of all,
I think you did a lovely job on the thoughtful finish of your Challenger .15 however,
I learned that the model has a wing area of only 220(or is it 230) sq"s. Sorry but
that is a bit small for most modern .15 engines. Please heed my advice on wing loading,
Your Challenger .15 is close to the same size as a Jr Flite Streak, But you have taken
your model to 15.72 ozs/sq'. That is in the Mini Elephant category(I know, I've built a few mini elephants myself).
best of luck. Tony
Hi there Chris, I tried to find performance reviews of your TT .15 mk V.
I couldn't find any, so I can only guess based on similar engines.
If your TT .15 mk V has decent power for a bushed baffled engine,
it should be right at home with a 250-300 sq" wing area design. So, if the
TT .15 is on the mediocre power side, you still have a lot of profile designs
and a few kits to consider as suitable.
For a mediocre power .15, I suggest you try to stay below 9ozs/sq'. Here's a few examples
of some of my profile models that are under 9 ozs/sq': Jr Flite Streak 11 ozs, Veco
Tomahawk 20.5 ozs, Full size Flite Streak 20.8 ozs . Keith Trostle is serious when he
says that most good flying 1/2A stunt models have 230-250 sq"s of wing area. I play
with a Ringmaster Jr that is modified(placed on a diet) for being powered by a Paw .049sbr
diesel the has a ready to fly weight(sans fuel) of 7.2 ozs. It fly's fast and is very aerobatic
on 44' X .008" lines. Yet, I can tell that it will fly much better with 30 more sq"s wing area.
So, ending this tome, I suggest choosing from the many good suggestions with 250-320 sq"s
of wing area. Best of luck;
Tony