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No doubt every plane is different. The Tailwind which is extremely fast has zero offset on the engine but the leading edge of the Vert Stab is off set .5 inches. I suspect the TW would be slower with the engine thrust off set. My very limited experience is that if one can wait until enough speed is built up for the rudder to become effective before pushing the throttle to the stop, then trips through the boon docks are unlikely . Jerry
On Apr 12, 2007, at 2:12 PM, Bobby J. Hughes wrote:
Ed,
Since the RV10 is matched drilled I am not sure how the vertical fin is
positioned. But I figure Van's took all of these items in to
consideration during the design process. No point in reinventing the
offsets. No jokes.... Is your ball out to the left or right?
Bobby
-----Original Message-----
From: Rotary motors in aircraft [mailto:flyrotary@lancaironline.net] On
Behalf Of Ed Anderson
Sent: Thursday, April 12, 2007 7:45 AM
To: Rotary motors in aircraft
Subject: [FlyRotary] Re: Mount offset
Hi Bobby,
When I designed my original motor mount for a 2.17 gear ratio I offset
it 5/8" to the left. Now that I have a 2.85 (opposite prop rotation), I
still fly with it offset the same. The only place where I notice this
"incorrect"
offset really gets my attention is on take off. I could really use the
prop pointing slightly to the right instead of the left. In cruise at
170 MPH TAS it is within 1/2 ball. My vertical fin has not offset.
Personally, if I were to do the motor mount again, I think I would shoot
for 0 deg offset.
Just my 0.02 worth
Ed
----- Original Message -----
From: "Bobby J. Hughes" <bhughes@qnsi.net>
To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>
Sent: Thursday, April 12, 2007 9:27 AM
Subject: [FlyRotary] Re: Mount offset
I did say simple and no I am done with geometry :)
-----Original Message-----
From: Rotary motors in aircraft [mailto:flyrotary@lancaironline.net] On
Behalf Of Ernest Christley
Sent: Wednesday, April 11, 2007 8:03 PM
To: Rotary motors in aircraft
Subject: [FlyRotary] Re: Mount offset
Lehanover@aol.com wrote:
With no experience at all in this area, I had imagined that the engine
would be turned about a vertical line through the prop flange. This,
to induce the required side thrust while keeping the spinner back
plate centered over the hole in the cowling.
Lynn E. Hanover
This will have very little to do with RVs, but John Dyke specifies 2/3rd
of one degree right thrust on the Dyke Delta. That is hinged at the
prop flange. He also specifies 1.5 degree upthrust, but that is hinged
at the firewall.
Bobby, a better way to measure the offset is to break out the old
geometry book and calculate the offset. The sin(1.25)x47" is 1.02".
The end of the engine will move off center by a long inch. You won't be
able to read 1/4 degree on most protractors, but an inch is easy to make
out.
-- ,|"|"|, Ernest Christley |
----===<{{(oQo)}}>===---- Dyke Delta Builder |
o| d |o http://ernest.isa-geek.org |
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