Re: Bell UH-1
Posted: Thu Feb 25, 2021 5:55 pm
First we need to plan what we are going to do.
A) Do we want a "realistic" simulation with our "amateur" efforts?
B) Do we want to code a battlefield 3 style some-kind of a helicopter?
Mine is A and i respect your decisions. We need to push forward and go beyond our limits.
At the end, i achieved a stable takeoff. It was reaaalllllyyy hard to stay stable on hover. But, this model is almost perfect in forward flight except these cases.
1-This huey is under-damped on yaw axis, means yaw stability is under damped. Maybe the vertical fin on the tail is not coded or mis-coded.
2-Tail rotor produces more thrust than it has to. I cannot roll left, only 30 degrees. Also helicopter response to right cyclic input for rolling right is too fast. This situation confirms the over-thrust on tail rotor.
3- I guess stabilizer horizontal bar on the main rotor is not modelled. This reduces stability of the main rotor. You may consider to increase gains of the main rotor controller.
4- a. You said the turbine model is ok. Yes, the rpm stay still. But when you collective up very fast, rpm will drop dramatically at a moment.
b. RPM oscillates around %1 all the time.
With a weaker tail rotor and a little more stabilization , this model will rock.
A) Do we want a "realistic" simulation with our "amateur" efforts?
B) Do we want to code a battlefield 3 style some-kind of a helicopter?
Mine is A and i respect your decisions. We need to push forward and go beyond our limits.
At the end, i achieved a stable takeoff. It was reaaalllllyyy hard to stay stable on hover. But, this model is almost perfect in forward flight except these cases.
1-This huey is under-damped on yaw axis, means yaw stability is under damped. Maybe the vertical fin on the tail is not coded or mis-coded.
2-Tail rotor produces more thrust than it has to. I cannot roll left, only 30 degrees. Also helicopter response to right cyclic input for rolling right is too fast. This situation confirms the over-thrust on tail rotor.
3- I guess stabilizer horizontal bar on the main rotor is not modelled. This reduces stability of the main rotor. You may consider to increase gains of the main rotor controller.
4- a. You said the turbine model is ok. Yes, the rpm stay still. But when you collective up very fast, rpm will drop dramatically at a moment.
b. RPM oscillates around %1 all the time.
With a weaker tail rotor and a little more stabilization , this model will rock.