riktor

So removing the right angle to the motor had definitely improved stability, same as adding weight in the nose. I did the test for the GC and the panther descend almost vertical and sometimes I had to pitch down a bit. I have now increase the negative pitch of the baldes and waiting to test again. How many degrees I should have on the blades ?

I removed (basically 0) right thrust and add another 30g in th nose. Something that is not clear for me. How adding extra. Egative shims (aka having more negative pitch on the blades) will force me to trim it more rear , should not be the opposite, should be?

@Richard Harris today I finally managed to fly again and record a video. Please can you provide your feedback?https://youtu.be/wPFNv8XnZMU

Hi Rich, As I bought the fuselage off bmfa classifieds I never bought the original plan and article. Can you advise what I should do?

Will try to make a video in the following days. 6kg digital hitec servos with very strong linkage. Bec is super stable at 6v.

@Richard Harris so after quite a while I manage to have the panther back in flight with a more forward GC, better balanced blade and a decent 4s battery. I need to understand now if the flight experience I had is normal or I still need to adjust something. The model doesn't feel stable, it is actually the same feeling of flying a flybar helicopter. I always have to correct it to keep it level or at a bank angle during turns. same for heading. one moment is was yawing left, one moment right depending from wind direction. Also never stable for pitch. Pitch correction was very much based on speed. So in summary the panther feels quite like an unstable plane with negative dihedral and very much wrong motor angle. Any feedback about? I almost feel the need of a gyros to make it stable.

I was hopping for a more lazy solution:) like 5£ to someone:) By the way with more forward CG and balanced propeller was flying amazing! I repaired almost everything. I need some covering film and back in the sky

Today I crashed due to too strong wind while turning downwind. My bad. All fixable but.. where can I find a new canopy?

Hi Rich, Thanks for your reply. Despite the video, the tilt is usually in pitch. So after the manual spinning, I keep the rotor pitch up while accelerating. Then I release it and continue the take off run until it take off almost by itself or with a very gentle pitch up ( like a normal plane) but every time the panther has a strong pitch up attitude that I have to balance by pitching down. Then once in stable flight, I can't go faster as it generate an higher rotor speed that will generate a pitch up motion again. About the roll: I'm not sure if it should behave like this ( not gently self centring) or it is normal Thant I have to manually compensate with opposite direction to keep a constant roll turn. It is like having a plane with negative dihedral. Just to better understand. Where should be the CG of the panther?

Hello! A bit late to the party. I bought an used fuselage on bmfa page, built the head using 3d print and Heli bearings, build the triangle using laminated fibreglass, carbon fibre and beechwood, built the blades as per pictures, and put it in flight. It is sort of ok but it looks a bit unstable on roll and pitch. Look like the CG is way back but I don't have the original plan to check. Also mine has the tendency to tilt hard just after take off plus same when it get a bit of speed. What I did wrong ?