RE: Tiger moth 280motor upgrade
I'm not sure offhand which prop and gearbox ratio would be the best for a dual IPS setup in the TM, but this is a common upgrade, and usually considered a better path than a 280 motor. [link=http://www.balsapr.com]Balsa Products[/link] has the numbers available for these if you look in the online catalog under "electric motors and parts". I *think* you would want the S1 ratio for use with the stock batteries, but look through the charts and see which setup has the highest thrust #s with your batteries and the 9x7 prop.