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1. 06:50 PM - Re: O-320 (Bob)
2. 07:55 PM - Re: Re: O-320 (rich smith)
Message 1
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No.
Backwards engineering, the design strongly looks to have been optimized for a 200
pound engine or less and I've heard similar from John. The tubes are small
diameter and the mount pick-ups look not to have been designed for such loads
in a heavy landing. Plan to mount the battery on the tailpost, add 20 pounds
of copper starter cable, plus some lead. The useful load would probably be down
to you and an hour of gas. The fuel flow would also cut you to a very short
endurance. A 150+ hp engine could seriously exceed redline in cruise. Because
of always being at or over gross, it'd take longer to get off the ground and
slow to accelerate out of the high-drag (nose-high) attitude.
I recently saw a Zenair 601HD with an empty weight of over 900 pounds. Despite
the big Subaru engine, the plane was quite slow, because the wing had to be kept
at such a high angle of attack for the heavy load.
Keep these planes light and they'll both cost less and run better.
Bob
A&P, Aero Eng
Kitfox V Vixen, partial complete, no engine
Damascus, MD
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Remember that internet advice may only be worth what you pay.
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=148498#148498
Message 2
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Thanks a million, Bob. I appreciate your comments. Rich
----- Original Message -----
From: "Bob" <dswaim1119@comcast.net>
Sent: Sunday, November 25, 2007 6:50 PM
Subject: Kitfox-List: Re: O-320
>
> No.
>
> Backwards engineering, the design strongly looks to have been optimized
> for a 200 pound engine or less and I've heard similar from John. The tubes
> are small diameter and the mount pick-ups look not to have been designed
> for such loads in a heavy landing. Plan to mount the battery on the
> tailpost, add 20 pounds of copper starter cable, plus some lead. The
> useful load would probably be down to you and an hour of gas. The fuel
> flow would also cut you to a very short endurance. A 150+ hp engine
> could seriously exceed redline in cruise. Because of always being at or
> over gross, it'd take longer to get off the ground and slow to accelerate
> out of the high-drag (nose-high) attitude.
>
> I recently saw a Zenair 601HD with an empty weight of over 900 pounds.
> Despite the big Subaru engine, the plane was quite slow, because the wing
> had to be kept at such a high angle of attack for the heavy load.
>
> Keep these planes light and they'll both cost less and run better.
>
> Bob
> A&P, Aero Eng
> Kitfox V Vixen, partial complete, no engine
> Damascus, MD
>
> --------
> Remember that internet advice may only be worth what you pay.
>
>
> Read this topic online here:
>
> http://forums.matronics.com/viewtopic.php?p=148498#148498
>
>
>
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