Darth, you were correct when you suggested "other" causes for my vmax7 problem. A new glow plug made no difference. Forgive me for going into so much detail but I need a little more advice. This engine has about 3 gallons of 25% Omega fuel thru it. During 80-90 degree weather the 7 performed well with the fuel set at 2 1/2 turns out. The idle was sometimes "rich" but the engine still had good lift. I had 1 washer under the plug. It diffenitely required more throttle to get off of the ground than it does now that the temp. is 60-65 degrees. I have added 1 more washer for a total of 2. It takes very little throttle to get off of the ground. It takes very little throttle for fff. But as you fly the engine becomes "sluggish" (gurgles). I think it is rich. Upon throttle increase ( to control what now has become a drop from mid air) the engine slowly speeds up until it hits what I'll call its "power band" at which time it launches upward. The whole episode looks like a helicopter shaped yo yo. I usually land it as quick as I can bounce it in. I have leaned to 2 turns but the engine did get too hot. At 2 1/4 turns the engine isn't too hot and the heli seems easier to control but you can tell that you're still on the edge of a problem. Also the engine would not idle. It would "load up" on fuel and die quickly at idle. Two things seem to have help this: #1 going from 2 1/2 turns out to 2 1/4 turns out. #2 going one step to the left on the throttle servo horn. My last flight out this evening was good. I landed several times to check engine temp. and it was ok. The engine idled for 60 seconds or so until I took off again. What do you think? Did 20-25 degrees drop in air temp make the engine act different? Would more washers help? It can't be a major problem with all that lift, right? I am using the 2 four degree grips. This is my first problem with my 7. Thanks in advance,
Mark