ORIGINAL: LearnedInUk
ORIGINAL: STG
You cannot expect to keep the throttle in one position and keep the plane at a constant speed as you are going thru a large loop. Do you mean that you are not increasing your throttle when you are climbing and not decreasing your throttle when descending?
No what i mean is that even when increasing power the plane seems to gain too much speed vs pull. I need more "bite"
Do you mean that it is gaining too much speed as it is gaining altitude--full throttle?
....but it wil not complete a big loop without stalling.
Do you mean that if you give it full throttle (as you start to pull up in a loop) it does not have enough power to pull thru the top of the loop? If so, it sounds like there is something wrong with your motor. What RPM does your OS108 turn the 15x6 apc? If it is turning in the mid 10's on the ground, and have poor vertical with a 9 pound plane, then I would suspect that you are running lean on a long upline and so running hot & low on power.
When I thrust tested the 17x4W it turned the same RPM as the 16x6apc and about 1/2 pound less thrust (~14.5pounds with 17x4W and 15 pounds with the 16x6apc).