Hi,
Please find attached pics. I think I'll take the route of using Jeff's plate to minimise complications.
Thanks so far.
Pierre
South Africa
The message is ready to be sent with the following file or link attachments:
Firewall 002
Engine mount reinforcing 001
Engine mount reinforcing 002
Engine mount reinforcing 003
Engine mount reinforcing 004
--
Pierre,
Mark the thrust line position on this drawing.
Do you have a cowl?
What diameter prop do they recommend?
What is the distance from the thrust line to the ground?
-------------------------------------------------
Here is the tail dragger version.
Got any dwgs on the nose gear. Can you scan the planes?
I might be able to work from photos if you take them 90 degrees
from the center line. From the side low down about 20 feet away.
Also take them from the front from about 20 feet away.
Use a 8 mega pixel camera.
Paul Lamar
Hi Paul,
I'll get the nose gear drawings from home and scan them tomorrow. The thrust
line is the top horizontal centre line but Steve Rahm says I can go a few
inches below that. I have no cowling yet as I planned to make one once the
engine is mounted.
From the plans there is no indication of prop size or height off the
ground. The original used a Subaru engine but Steve has sort of given
builders carte blanche as to which engines to use as well as modifications
to suit individual builders.
As far as I know, I'm the first builder to use a Rotary. Of course this
changes the whole ballgame as the Subaru pushes out +/- 100hp and the Rotary
will be 250 plus hp. This would mean that I, with all the help from you,
have to decide on prop pitch and length and from there decide the height of
the nosewheel configuration. Also the main gear has not been made up so a
few inches this way or that way can be accomodated. I would imagine that,
with that increase in horsepower, the prop would be selected more for
cruising performance than for takeoff.
I rather like the idea of the nosewheel mounting incorporated into the
engine mount as I would imagine that it frees up some space on the firewall.
Just as a guess, what sort of rpm would I see on the engine, if I want to
cruise at say 200mph, given the correct prop pitch and diameter. Also, what
sort of climb rate can I expect on that prop.
Thanks so far
Pierre
Assuming a 250 HP p-port.
From the looks of it about the same performance as an RV6A.
Top speed will be about 220 MPH as a rough guess.
Climb will be a strong function of gross weight.
My guess is about 3000 FPM assuming a climb prop
at 1650 pound gross weight.
Cruise depends on how much gas you want to burn.
At about 10 gallons an hour right around 190
MPH +/- 15 MPH. A strong function of prop pitch.
With a 2.85:1 max RPM will be about 7500.
Make sure you static balance all control surfaces and use carbon fiber
for all tail parts. Thicken it up until it comes out at the same
weight as the glass parts. The RV6 VNE is limited by tail flutter.
The prop I recommend is a ground adjustable 72 inch Sensenich 3 blade RV prop.
You will have to make your own hub I think. It need not be
as fancy as a Sensenich hub but more like a Warp Drive prop hub.
BTW you will have to cut down the 13B water pump or use an RX8 pump
to fit under the cowl.
Paul Lamar
The Rotary Engine NewsLetter. Powered by Linux.
ACRE NL web site.
http://www.rotaryeng.net
Youtube key word PaulLamar2
Copyright 1998-2011 All world wide rights reserved.
