Herr Ryan ST

[FlySlow]

Just thought I'd try to post a picture of one of my recent projects.


Herr Ryan ST rubber powered converted to R/C
Motor: GWS "A" with GWS 8/4.3 prop. 7cell 300 ma nimh
Radio: Maxx Products Rec., Esc, & servos. Azarr antenna.
Length:20" Span:30" Weight: just under 6 ozs.
Covering: Airspan
Controls: Aileron, Elevator & Motor

Plane is equiped with leds for night flying also run off main pack.

Has not flown yet due to weather but I will update with results as soon as possible.
Rob

[FlySlow]

Well it flies! Very fast.
The first flight was very exciting the ailerons did not seem very responsive for the speed. Elevator was good but it seems kinda
jerky I think it might have been better to enlarge the tail surfaces.

But later in the day after flying some other stuff I tried again with more aileron throw. I made one very big mistake!Earlier I had to change the servo direction on elevator for my TM so I forgot to change it back, after hand launching the flight was cut very short!! Total loss. After 25 years of this R/C stuff I should know better.
But I'm now working on a Herr Stearman PT17
and I'm in the process of buying a programmable transmitter so I can't do this again, I hope!

[Aobid]

Rob,

Sorry to hear that your Ryan didn't make it. It looked like you did a really nice job. I too recently converted the Herr 35" Cub with rudder and elevator. I used the GWS A motor, 2 CS-10 servos, GWS IC-100 ESC, and the GWS 4ch receiver. Power pack was a Ray-O-Vac 9volt nimh for the test flight, 7.2v 150mah nicad and a 8.4v 270mah nicad for the other flights. I must agree with you that it did fly very fast. My overall weight was right about 5.5 to 6 with the first two packs. I was expecting a very slow flyer, but there would have been no way for me to fly it indoors. I did experience some odd behaviors. It tended to have strange slip effects instead of turns when I applied rudder. Full up elevator resulted in sort of a loop/roll effect. I switched props around from originial 8x4.7 to a 9x6 which was about the biggest I could go due to ground clearance.

With the 8.4v 270mah pack, it zoomed like a rocket! The craft proved to be too unstable. I did however slowed it down with the 7.2v 150mah pack, but it was on the verge of a stall most of the time. It stalled very without any sort of warning most of the time. I did consult with Dave Robelen who provided me with some very excellent tips. He suggested a bit of washout and to enlarge the vertical. Before making the changes, I went out for one last flight and one last flight it was! I went to turn on a medium speed fly by, on the entry of the turn, it sort of stalled/spun/spirled in!


I will rebuild it one day since I spent so much time into it. Mine was covered in the stock tissue with one coat of dope. I made the wing removable along with a cowl to allow easy access to the motor and ESC. I also made a hatch on the bottom to access the battery without having to remove the wing. I must commend Herr Engineering on such a fine kit. I have my eye on the Hacker Decathlon for my next conversion, it will have a full house set up and will be covered with RA Microlite.

Regards,

Aobid

[FlySlow]

Aobid,

Thanks for the info. I also put a hatch and made the wing removable to access the motor and make adjustments for balancing.

Do you have any suggestions on how much I should increase the size of the tail surfaces? I was thinking around 25%.
I guess a little larger than needed won't hurt anything.

I'm also going to use RA microlite for covering.

Well good luck with your Decathlon.

Rob