RE: Top Flite Giant P47 arf IS coming
DHC6,
I'm with you, nothing beats the sound of a Radial and I will be purchasing the Evo 77 Radial for my ESM 50cc Corsair. Although there is another option to consider, CRRC 55 twin. I have one in a 1/3 scale Christen Eagle and it is a very robust engine and idles much better than a single cyl 50cc. Hope this helps, see specs below:
Type: Two-stroke piston valve petrol aircraft engine
Displacement: 55cc(27.2ccx2)
Bore x Stroke: 34mm×30mm
Carburettor: Walbro(Diaphragm & Butterfly Valve)
Max. Output: 5.6ps/7600rpm
RPM Range: 1600-7800rpm
Weight: About 1780g（Engine+muffler+CDI）
Ignition power: Auto advanced CDI(DC 4.8 Volts , 4 cell NiCad or NiMh battery) RC EXL IGNITION!!
Fuel mixture(Ratio of gasoline and oil): 25-40 : 1
Propeller: 20X12-23X8 two-blade prop( suggest to use 22x8 prop