The AP Wasp is a superb running engine, and the only small engine I know that has a bronze bushed crankcase. I have run 3 of them, and all were good runners, easily equal to the Big Mig Norvel .061.
For an .049, the Medallion from C*x has a great stunt run. Also the Norvel Big Mig .049 if you can score one. The MK I Brodak is an excellent choice if you add the Nelson Head, but that makes it cost about $80 total! Tee Dee .049s run strong, but need pressure to be reliable, and won't swing as big a prop as the Medallion without overheating.
The old Atwood Shriek will pull through maneuvers well and has about the power of the Medallion, but uses smaller props to do it. I suspect that the Holland Hornet could work well if you restricted the venturi. I have never run one except on a free-flight, so I can't really say.
My painful experience has shown that only the C*x engines are happy with props as big as the C*x 6x3. All the others should use things like the APC 5.7x3, or 6x2 and older props like the Tornado 5x3. Otherwise you will get overheating about half way through your flight. C*x engines are happy with up to 30% Nitro, the others should stay under 20%. 20% oil, half and half is good for all these engines. More oil doesn't hurt anything but gas mileage.
PAW diesels are also an excellent alternative, and can swing BIG props with ease. Just be sure to use Neoprene or Vinyl fuel hose, not latex or Silicone.
Topic: Ehgine recommendations (Read 1737 times)