Paul, Pardon my ignorance, but is there a web forum related to this
newsletter or are all of your discussions pushed to newsletter
recipients via email (e.g., the crashed/rebuilt P/S 215 thread I am
currently receiving)? Regards, Carrick
I Mr. Lamar,
I would like to subscribe to your newsletter. I don't bring much if
anything in the way of technical expertise but in the course of my
own initial research in selecting a powerplant for my
post-retirement homebuilt aircraft project, I have come to the
initial conclusion that a rotary engine is an excellent choice in
terms of its power to weight ratio and overall reliability. As I
pursue my goal of a rotary powered homebuilt, I will likely be asking
a lot of questions; I hope this forum is the place for gaining the
knowledge and insight I need.
Thanks and Best Regards, CB Cheney
Welcome on board. I agree with you.
Paul Lamar
In any event,
I would like to know if anyone is operating a single rotor 13B w/
EFI & turbo (Richard Sohn maybe?) and if so, what Takeoff & Cruise
HP ratings are they getting? Also, are all aluminum rotor and side
housings still available for the 13B or Renesis (I see
RotaryEngine.com Al side housings but not so sure of rotor
housings)? Haven't seen anything specific on the Pettit, Atkins,
Mazdatrix, Pineapple, and other sites. Would like to know what the
firewall forward ready to fly weight for such a setup might be? My
target would be a ~200lb (or less) setup as described above with ~200
hp Takeoff and ~180 Cruise power. Is this a Pipe Dream / Unicorn
Hunt for a single rotor? Envisioned airframe is the Just Aircraft
Super STOL (not the soon to be debuted Stretch XL version). Any
insight you have would be greatly appreciated.
Regards, Carrick Cheney
A single rotor with aluminium end housing (from Racing Beat) under
200 pounds and 120 HP is doable at 7500 RPM with a 3.12 to one gear
box and a P-port. NA
A NA p-port 2 rotor version would generate over 250 HP and weigh
not much more.
Russ McFarland's 650 HP turbo P-port time to climb engine in the
works weighs 220 pounds with Bell 47 gear box. It runs on alcohol.
Paul Lamar
Thanks, this is very helpful. I'm thinking that if a NA motor
generates 120hp @ 7500 rpm (nominal takeoff rpm I'm guessing) then a
boosted plant might get me 150-180hp without undue stress. Regarding
weight, the folks at Just Aircraft say their (non-stretch) Super STOL
engine weight (Rotax 912/914 is the std) should not go beyond 200 lb,
although I'm not sure if that's the whole firewall forward
arrangement. Their Stretch XL can accommodate up to 315lbs., enough
for the new UL Power 520 or a Lyc O-320, but again I don't know if
that is engine weight or for the firewall forward package. I will
have to check with Just AC...
CB Cheney
The one rotor turbo is a compact engine as the turbo can bolt
directly to the block. Here is a belt drive version.
Paul Lamar
How are single rotor engines for vibration caused by a single firing
pulse every 360 degrees. Seems like it should be like a 1300cc
thumper motorcycle engine. A bit shaky.
Dale Davies
Dale, concerning balancing the single rotor firing pulse, see the link for
interesting reading about overcoming the challenges of a single rotor build
for aircraft engine application:
http://www.fairpoint.net/~res12/html/one_rotor_wankel.html
The author does not appear to be resource constricted.
CB Cheney
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