ORIGINAL: neilmot
Has anyone experienced a problem with the alpha 40's engine stalling when going from idel to full thorttle? We have a few new planes at our club with the same problem... The engines start instantly and even after a warmup with the glow batt the engine often stalls during the transition from idel to full. We have tried all the limited needle settings for LS and HS. If it were just 1 plane we would understand but it's at least 3 and 1 is a P51 PTS with the same .46 engine... We can get the planes flying but above half throttle. they sometimes stall on touch and goes... We have gone past the needle limits to get them to fly
Any ideas?
BTW the plane is a great trainer! Flys well. Very simple...
Neil
I've got a couple of Evolution's as do some of my students and several other members in the club. All of them transition from low to high and back with no hesitation. Sounds like you need to set the low and high-end needle valves. Pull the limiter pins from both needles and tune it like any other engine and it’ll run just fine.
When you reset the needles, change the glow plug also. Once they hit the point where they really break-in, Evolution’s seem to fall on their face until the needles are reset. When you set the high speed needle, open it up to the point it starts to 4-stroke to make sure there is no junk caught behind the needle, then peak it and turn it 3 or 4 clicks rich.
Hogflyer