ORIGINAL: LamarJ
Can anyone advise me on a good prop selection for my SIG 4* 40 powered by a Supertigre .40 engine?? This is my first build since the trainer and I am down to the prop. My hobby shop was a little unclear about a selection.
Thanks,
Lamar
The ST .40 and the 4* 40 make an excellent combination, For ease of landing I suggest the 11-5 to start with. I like wood props for sport flying. APC types are excellent for competition but don't break easily enough when they encounter something besides air.
Once you get everything going well, try the 9-7 for speed and then a 10-6 for whatever, and maybe an 11-4. The 11-4 may over rev during certain unloaded maneuvers, thus making a lot of prop noise.
The 4* likes to float. Lower pitch props with a decent idle will air-brake it just a bit making landings easy and smooth. Some years ago we raced the combination with 9-7 props and landings took a bit more application of fine talent.
Enjoy the machine. The wing is fragile however it will hang in there for sport flying. When you get really seasoned on it cut one rib-bay off each wing outer panel. You will step up a couple rungs on the ladder.
