RE: Biplane problem
Thanks boy's! will try to use all of this information and see what I get.
Well .......... here is a more detailed description.
Take off is accomplished at 50% throttle as full throttle makes the model swivel violently to the left like made and no amount of rudder stops it.
The model will not lift the tail 1st it will simply Jump into the air and fly at a strait line for a few meters . Then when power is applied it will start to clime but will then start a banking left turn. At this point the down elevator is not much use as I am already at a vertical situation and the unavoidable is evident.
2nd flight was different Take off was accomplished in a strong head wind. Again take off at less than 1/2 throttle flight at a strait line only this time it was a lot shorter. The left banking turn was again evident but this time it was more of a roll and no amount of right aileron (which would make things worse) fixed it. However the original right swinging to left swinging motion was not evident to this flight. I had added another 2 degrees right thrust (total of 4 degrees & 2 down).
Wind loading is not bad it is only 23 oz top wing has a 73 inch span (Some of my other warbirds are over 30oz and fly great).
The CG was calculated by the Tail volume method and I started at 15% or the top wing LE. This required an additional weight of 200grams to get this CG. So during taxi I had the occasional tip over.
Well at least I am now thinking of repairing the model (after 2 rebuilds I am getting a bit tired building for a week or 2 and crashing in under 5 seconds) but this time I will try a different setup Top wing will be at -1.0 , bottom at +1.0 Will try to keep it on the ground until I run out of active runway (Will try not to hit the fens at the end of the runway _ Or will find a bigger field to test fly it).
Keep it coming!
Regards
Kaiptain_YAK