So guys here is what a finished one looks like. The level of stabilization is unbelievable, a key factor is in the torsional rigidity of the motor arms and the weight of the props. Whatever you do electronically I think it will be impossible to replicate this with upright long motors on a long stick. Demo videos will start when the weather improves. Bur after weeks of non stop wind and rain, efforts have been shifted to further dev. work.
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think it it better.
The model can be flown with any controller, but my prototypes have WKM and Naza at the moment, I do expect to be testing AMP-2 soon I hope as the camera mount is to be stabilized with a modified AMP-2. No price fixed yet as some tooling still needs to be done.
The problem with making props light and strong is that is it a compromise to make them from wet lay-up carbon epoxy. The hand lay-up autoclave prepreg route is the only way to get the best results. Time consuming and very expensive as it needs 275 deg.f to cure. Prepreg resin and carbon nanotube fibers is the only other solution that I know of that could do the same job as an infusion molding.
I'm working on that at the moment.
Max
The props are a development from what were originally 14.4.7 APC slow flight that were cut down to 11" dia.
The current prop. that is made from carbon has a wider chord. and is much lighter and stronger. They are made with a home made autoclave which is a labor intensive job for me. I am working on ways to improve production to a point where it could become a commercial reality.
The short T-motor pancake style motors have two advantages for me. they run much smoother than anything else that I have tried and they have a short overhang to the prop. The props are mounted direct to the bell housing with no adapter to save weight and keep it shorter.
So why shorter, That is because aerodynamic disturbance in the descent causes imbalance if the motor can twist on the arm. once an eccentric movement happens the vibration becomes magnified. The longer the overhang the worse the situation becomes. Just static balancing of the props is not enough on it's own.
The motors are inverted to reduce the aerodynamic drag and disturbance from the arms. i.e. most of the upstream airflow comes in from the sides and then converges to the center on the downstream side.
I am working on demo vids. at the moment but high wind and rain is a constant problem. plenty of dev work still to do on the autoclave.
The weight with everything including 550D camera and telemetry is around 3.3 kilos also with 4 cell 5800 Ma. main battery and aux. 3 cell battery. That is everything ready to start filming.
The distance between motors is 535 and the prop dia. is 10.5 " x 4.5
It is made from carbon fiber and kevlar
The long motors have a greater distance between mounting plate and the prop. which is not good.
Inverted motors give less drag from the airframe as the air enters the disc from the sides rather than from on top.
Stability comes from a combination of things mostly from the motor/prop response and the length and structural integrity of the arms.
Hope that helps.
Can we see it fly?