Hey Coach Chuck,coachchuckaahs wrote:Since you are still at experimenting stage, add some clay to the nose.
Once this is tested, and if it works, then you can worry about getting back down to weight.
Think of the motor stick as a beam in bending (and buckling). It has the highest loads in the middle. So you can sand both height and width at the two ends to reduce weight (or just at the tail end to move CG forward). You could sand both ends a bit, then add clay to get back up to 8g.
This year's plane should be build-able in the 6g range, giving 2g of ballast to move around. Not sure which kit you have. It it is FFM, it has carbon wings, so the big weight issue is in the motor stick. Judicious selection of MS wood, and careful reinforcement can get you a lot.
But focus on the moved CG and increased decalage first, see if it solves your problem. Then go to weight reduction to make up for clay.
On a partially related note, we are having trouble with our motor stick flexing (inducing negative climb at the beginning of our flight, oftentimes causing a dive which hits the floor). We have only been using one strip of carbon fiber on top as per the FFM kit plans, but we find that it is not enough. We are wondering how your team was able to stop the motor stick from bowing (whether it was extra carbon fiber strips, a kevlar truss--like in Helicopters 2017--or some other method)?