RE: Top Flite B-25 ARF (Tecnical, tips, suggestions)
After two days cleaning out the dirt and about 2 hours in repairs, the B-25 flew again. I did switch to 11 oz tanks and 12x6 MAS 3 blade props. These give plenty of thrust and speed, and keep the engine revs around 10,000 so fuel efficiency is much higher. During testing, the engines both ran almost 30 minutes before running out of fuel.
I was able to synch the engines to within 50 rpm of each other by carefully shortening the throttle push rod on the faster engine. Both engines are tuned to jump up 200 rpm on a "pinch" test, which is where the 55AXs run best.
I still can't get over how easily this airplane handles. It's my first glow twin, and I'd recommended it as a first twin to anyone, it's that easy to fly. The only real differences between this scale bird and sport planes are:
1. On takeoff, after getting to full throttle, just put in a little up elevator and hold it. She'll fly off when she's ready in a lovely scale manner. I use flaps on TO to reduce the ground run.
2. Do the landing downwind and crosswind legs at half and about 1/3 throttle, respectively, with flaps down. Anything less than that and you'll get too slow for safety. This bird has a lot of drag and slows down quickly without power. I reduce to a 3000 rpm idle after having settled onto final near the threshold. Then, just let her slow down in a level attitude as she sinks toward the runway, and get the nose up gently just before touchdown.