RE: sopwith pup project
Hi, I have been flying my Puppeter for about 5 years now. It is among the best bipes I have ever flown; and I have flown quite a few of them.
Mine started with an OS 48 and it was just right.
I switched later to a 52 for more aerobatics (retaining the 48 carb to avoid making more holes in the cowl) and is perfect for my taste. It has ample power power all scale aerobatics; for any mishapps and also if the engine is not quite tuned or operating on old fuels or an ugly plug, it will still have power to fly safely.
A 62 is a LOT of power and you will find yourself flying at less than 1/3 power.
Also, unlike most bipes, if you place the batteries in the firewal front (cowl area) the plane needs no or very little nose weight, so a big engine is more weight that kills the most appealing feature of this bipe; a 12 Oz/sqInch. wing loading that gives you a "no stall" machine that lands at ridiculous low speed.
On my mainden flight, I did a wheel landing and after completing the maneover, I applied full up elevator to do the final "u" turn" and taxi back. Guess what, it tried to take off again with just the remainder speed of a completed landing.
I suggest that you add a on board igniter so that you can get a real low idle, otherwise, only wheel landings are possible!.
Do make sure you cool the engine well. Add aluminum buffers and increase the rear airflow exit opening. This has been my only problem so far with the airplane.
I liked the plane so much I bough the Fokker D 7 from the same Flai guys..
Good luck.