Author: "Allen Fulmer" <afulmer@...> Time: Wed Nov 9, 2005 7:45 pm PST Link
Read from the bottom to get the context.
I would guess this would not apply to SubE!
Allen Fulmer
RV7 Wings (QB Fuse on hand)
Eggenfellner Subaru H6 on order
N808AF reserved
Alexander City, AL
256-329-2001
-----Original Message-----
From: owner-rv-list-server@matronics.com
[mailto:owner-rv-list-server@matronics.com]On Behalf Of
LarryRobertHelming
Sent: Wednesday, November 09, 2005 2:43 PM
To: rv-list@matronics.com
Subject: Re: RV-List: First Engine Run
--> RV-List message posted by: "LarryRobertHelming" <lhelming@sigecom.net>
You are correct. You want the wings attached, and Prop attached. The
Lycoming and that type engines will do a bit of shaking.
Indiana Larry in Evansville, RV7 Tip Up SunSeeker
----- Original Message -----
From: <Jerry2DT@aol.com>
To: <rv-list@matronics.com>
Subject: RV-List: First Engine Run
> --> RV-List message posted by: Jerry2DT@aol.com
> Speaking of first engine run... One of Van's guys told me that it might
> be
> unwise to run the enigne without wings attached. Allegedly can cause
> airframe
> damage. Archives didn't help, so any and all experiences/opinions/advice
> more
> than welcome. My -6a is still in the garage, but engine is ready, so would
> kind of like to run her out to the driveway and crank it up...
>
> Jerry Cochran
> Wilsonville, OR
>
> <<is approaching its first engine run. I need
> to know what auto plugs are recommended for use with a Jeff Rose
> Electronic
> Ignition. My EI came with wiring for auto spark plugs, but Jeff Rose no
> longer recommends using auto plugs. Rather than change out the wires, I'd
> like to try the auto plugs.
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Author: "pepeborja925mb" <pepeborja925mb@...> Time: Thu Nov 10, 2005 1:04 am PST Link
If starting the engine, any engine, w/o the wings attached causes
structural damage then I think I made a major mistake purchasing this
kit airplane. :(
Would be nice to find out what kind of damage has been experienced to
cause the warning.
Jose Borja
Elk Mound, WI
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Author: "Michael Wilson" <michael@...> Time: Thu Nov 10, 2005 5:51 am PST Link
I'm thinking that no structural damage is possible other than perhaps
tipping the plane over due to the significantly decreased roll moment of
inertia. (You know, a quick throttle up to full power *may* be enough to
roll the plane due to the reduced weight and moment).
Just a guess.
-mike
-----Original Message-----
From: RV7and7A@yahoogroups.com [mailto:RV7and7A@yahoogroups.com] On Behalf
Of pepeborja925mb
Sent: Wednesday, November 09, 2005 11:24 PM
To: RV7and7A@yahoogroups.com
Subject: [RV7Yahoo] Re: Engine vibration
If starting the engine, any engine, w/o the wings attached causes
structural damage then I think I made a major mistake purchasing this
kit airplane. :(
Would be nice to find out what kind of damage has been experienced to
cause the warning.
Jose Borja
Elk Mound, WI
Van's Air Force - World Wide Wing
www.vansaircraft.net
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Author: "Mike Newall" <a1b6@...> Time: Thu Nov 10, 2005 5:52 am PST Link
Most aeroplanes similar to ours will not be happy without the wings on
if you run the engine. The wings act as large dampers to the torque
and power pulses from the engine. If the c of g and undercarriage
track were different, the whole thing would be more stable. It has
little to do with the design, more to do with basic physics.
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Author: Dave Nellis <truflite@...> Time: Thu Nov 10, 2005 11:30 am PST Link
My guess is that the wings, with a long rotational
moment arm, act as dampeners. One bad hit on a
cylinder and the prop stops while the fuselage
rotates.
Dave Nellis
--- pepeborja925mb <pepeborja925mb@yahoo.com> wrote:
> If starting the engine, any engine, w/o the wings
> attached causes
> structural damage then I think I made a major
> mistake purchasing this
> kit airplane. :(
>
> Would be nice to find out what kind of damage has
> been experienced to
> cause the warning.
>
> Jose Borja
> Elk Mound, WI
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Author: "Bill Swaim" <bill@...> Time: Thu Nov 10, 2005 11:30 am PST Link
I'm certainly not a structural Engineer, but am an ME. It would seem to me that, as stated below, without the wings attached the very short roll moment would allow a relatively large rotation, very quickly, one direction. But that would be followed by the same in the other direction. Same momentum, shorter arm. I can see this large & rapid oscillation possibly causing damage - IMHO. Would it be kind of like maneuvering speed.....less weight, quicker movements and hence lower allowable speed?
If you tied the whole fuse down with large bungee cords at the wing root, you could probably come close to duplicating operation with the wings attached. For the record, I'll wait till my wings are attached.
Bill Swaim
Slow Build Fuselage
N615KS Reserved
----- Original Message -----
From: Michael Wilson
To: RV7and7A@yahoogroups.com
Sent: Thursday, November 10, 2005 7:10 AM
Subject: RE: [RV7Yahoo] Re: Engine vibration
I'm thinking that no structural damage is possible other than perhaps
tipping the plane over due to the significantly decreased roll moment of
inertia. (You know, a quick throttle up to full power *may* be enough to
roll the plane due to the reduced weight and moment).
Just a guess.
-mike
-----Original Message-----
From: RV7and7A@yahoogroups.com [mailto:RV7and7A@yahoogroups.com] On Behalf
Of pepeborja925mb
Sent: Wednesday, November 09, 2005 11:24 PM
To: RV7and7A@yahoogroups.com
Subject: [RV7Yahoo] Re: Engine vibration
If starting the engine, any engine, w/o the wings attached causes
structural damage then I think I made a major mistake purchasing this
kit airplane. :(
Would be nice to find out what kind of damage has been experienced to
cause the warning.
Jose Borja
Elk Mound, WI
Van's Air Force - World Wide Wing
www.vansaircraft.net
Yahoo! Groups Links
Van's Air Force - World Wide Wing
www.vansaircraft.net
Yahoo! Groups Links
[Non-text portions of this message have been removed]
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Author: "pepeborja925mb" <pepeborja925mb@...> Time: Thu Nov 10, 2005 11:31 am PST Link
I think this is the result of message degradation resulting from
passing through multiple people until it gains urban myth status. If
the FAA gets a hold of this one we will be required to install a
placard that reads: "WARNING: operating the aircraft without the wings
installed on may cause structural damage and possible death."
Besides, how's a guy supposed to feed fuel to the beast if the tanks
are on the wings? IMHO, the best time to start the engine for testing
is when the plane is about ready to fly. No need to scare the
neighbors with a runway engine (forgot to wire the kill wires?) as one
desperately tries to squeeze the fuel line to starve the engine.
Jose Borja
Elk Mound, WI
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