RE: 150mph + planes
I don't know how to bring the link to a video over to here, but on page 4 at the 1/2A forum, there is video of 3 little racers. The thread is called "LEFT COAST RACING VIDEO", or something like that. The first plane is powered by a stock COX reed valve engine and is doing about 60. The second plane is a scratch built racer that I built. It has a glass fuselage and solid balsa wing. The engine is a piped G&Z .061 that I got from BILL HUGHES. With a 4.2 x 4 APC and 50% nitro, it tachs 42,000 rpm. It is too expensive to run that way, but the sound is priceless! In the video I have toned it down a bit for sport flying, it is running 15% BYRONs' and a 4.2 x 5 ELIMINATOR prop at 36,000 rpm. The plane has 124 sq " and weighs 14 ozs RTF. You can definately hear an unloading once airborne. On paper this set up is good for 170 mph, so be the judge if you see the video. The last plane in the video is a FORA .049 powered, scratch built roughly GUILLOWS dimensions] MUSTANG, belly scoop and all. It turns a 4.2 x 4 APC at 32,000 on 15% fuel. It also has about 120 sq " of wing, but it only weighs 11 ozs, so it is a nice racer around the poles. It would be fun to have a racing event for this little stuff, the CYCLONS and FORAS are easy to operate and inexpensive to run once you get past the initial investment, they just run and run.
[Editted to direct viewers to page 4 of 1/2A forum]