12 f


Dear Paul,

My name is Gerhard Schiffmann, and I've recently completed building a brand
new experimental airplane of my own design (see attached photo).
It is a fiberglass amphibious plane, based off of the Dyke Delta planform,
with the exception that it is a pusher configuration. The powerplant I
selected for my plane is an RX7-20B, non-turbocharged, rotary. Currently,
I'm in the Phase I testing of the aircraft and have successful completed
several high-speed taxi runs, including a sustained lift-off of a few feet
(for about the distance of the Wright Brothers first flight haha).

I've currently been struggling to program and master the accompanying engine
control module supplied by Traci Crook at Real World Solutions.
In this endeavor, I've been trying to contact Traci, but have been unable to
do so. Therefore, I was hoping to reach out to other Rotary engine users, in
attempt to receive some assistance, insight, and/or tips on programming
these amazing, yet misunderstood, engines.
Obviously, I have the engine up and running, but it's just the final tuning
of the engine for various throttle positions that I need some assistance
with.

Any help or recommendations that you would be gracious enough to provide,
would greatly appreciated.

Sincerely,
Gary  Schiffmann

Gerhard/Gary-
Wow, that is quite an interesting design. A bit like a small version of the
Russian Be-103 amphib, I always thought all we need to do is make a carbon
fiber bottomed version of it scaled down with a couple REBTT rotary
engines.....would be lighter and the cat's meow! I even rode in one of them.
Built like a tank.
https://en.wikipedia.org/wiki/Beriev_Be-103
Keep us posted on your progress. I have a Traci 20B unit, do you have the
instructions that came with it? I can dig them out if you don't have them.
Maybe some of the BE-103 design features might help out your water
maneuvering.
Send me/post your email and I can scan them for you.

Marc Wiese

Gary,
   I have made inquiry to the "Dyke Delta Forum" about your A/C and found
one member who did a "Tech Counselor Visit" of your project several years
ago and had good remarks about your construction quality......He mentioned
concerns about the low angle of attack for both land and water and coupled
with the high mounted 20B Rotary engine (at least 250 hp) predicted that
there would be great difficulty rotating for takeoff....


..The "Dyke Delta JD1"
has approx 9 degrees AOA sitting on its gear...Several other forum members
and Delta pilots expressed their concerns with the AOA.......I received more
info that indicated that you were making further modifications to the gear to
address the AOA problem and had abandoned water use (at least for now).


  Many on the Delta forum find your design very interesting and wondered
if you would share more details about size, weight, etc.......If construction
photos are available many are intrigued by your composite air-frame......


  I would like to add a personnel opinion.......I know that your air-frame had
to be strengthened for water use which added many pounds.......Perhaps
a land only version would have better performance if someone were to build
it tractor powered........


 As far as water use is concerned perhaps a retractable ski behind the nose
gear would increase AOA like was used on the "Convair SeaDart" would allow
rotation off the water........The "Sea Dart" in the photo had two retractable ski
but one version had a single ski........

Best Regards,
Kelly troyer


  Convair Sea Dart

------------------------------------------------------------------
Please  add your questions or comments  at the end of the thread.
Not the beginning.

I am going to enforce that rule. If people don't do that it will not be forwarded.
My ISP changed the rules.

The Rotary Engine free News Letter. Powered by Linux. If you want off
the list PLEASE let me know and I will remove  you.  ACRE NL web
site. http://www.rotaryeng.net You Tube http://tinyurl.com/beqqxas
Copyright 1998-2018 All world wide rights reserved.