ROWLAND F1-535 nears production status

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.

  • Do you think if flown with APM2 this machine will be stable enough to compete professional aerial photography systems like DJI or MK

  • 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.

  • Hi Danny

    What about the pricing and availability. What controller will be used with this machine

  • 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.

  • In addition, I'm very interested in your ability to produce accurately balanced carbon propellers, as I have some ideas I'd love to throw around with you regarding some custom props that I believe would be a huge hit and sell hand-over-fist if feasible. Let's talk.
  • Sounds like you've actually done your homework here, Denny. I have to admit, at first I was nt sure what to think, but after only reviewing just the responses on this single page, I intend to follow you on this. The answers you've given follow the experiential data I've witnessed through first hand observations with my own r&d. Keep it up! Can't wait to see some flight test videos!

  • Developer
    Thank you very much.
  • 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.

  • Developer

    The frames looks grate ! 

    What motors you use ? And are this props just 12" X 4.5 that you cut to 10.5" or you making custom props now  ?  

    The long motors have a greater distance between mounting plate and the prop. which is not good. 

    Also can you please explain why ? If the prop passes to close to the arm it will increase vibrations.. no ?

    Thanks in advance 

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