ORIGINAL: mc1982
when i added throttle it would climb steeply and when i was inverted no matter what thottle settings the plane would dive towards the floor.
On a new mid wing, symetrical winged plane, with the C.G. set properly, e.g. a pattern or sport plane, at 60-75% throttle the nose may drop slowly both upright and inverted. ( This assumes that at aileron neutral, the ailerons align with the wing chord... ).
If the plane is built right and the C.G. is where it belongs the amount of drop, or rather the rate of change, should be the same both upright and inverted.
Normally we then tend to adjust the trim for hands free flight at mid to high throttle, which acts to drop the nose more quickly in inverted flight... you've done the latter, but it sounds as if the C.G. is too far forward to begine with...
ORIGINAL: mc1982
The CG is fine,
Don't assume this is true! Even if you have the C.G. EXACTLY at the recommended point, it still may be way off for "neutral" flying chacteristics, which you seem to be hunting for.
Instead, adjust the trim so that the rate of change into a dive, is the same both upright and inverted... land the plane and start moving the C.G. back by moving say the battery pack back... do not more than 1/2" at a time maximum...
Fly it again.
When you notice that you only need a small amount of up elevator at 75%-80% throttle to keep the plane level, you've found a good "working" C.G. point...
Flip it over, and you'll also find it much easier to hold it inverted.
ORIGINAL: mc1982
i have added alot of downthrust to the point where its silly and still, it climbs when i add throttle and dives inverted. is there any way i can trim this out from the radio? If i move the ailerons a few degrees down would it sort this out?
This is NOT why and how you adjust downthrust.
If the plane is trimmed for level flight, when you are flying it at 80% throttle, then if at the moment you pull off throttle to idle, the plane climbs, you need MORE upthrust ( NOT downthrust!!! ). If the instead when you pull off throttle the plane DIVES you need more DOWNTHRUST!
Whaaat?????
Yes, This is completely counter-intuitive... the idea is to get the plane's attitude NOT to change when power is pulled off.. that the thrust line is in the plane of forward flight...
If in turn the plane still dives suddenly when you pull off throttle ( and the trims are neutral ), then you have either a C.G. or incidence issue... since incidence tends to be defined by the manufacturer's build... C.G. is the most likely culprit...