Note: forwarded message attached.
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Craig,
All comments have value, and it is difficult to evaluate on e-mail. If you
have a taper shaft engine, instead of the later flange shaft, you should
carefully check the prop hub for a crack.
Improper hub nut torque...too much or too little, can lead to a cracked hub,
and vibration..later to possibly result in the loss of the prop..
Well worth haveing a good look.
Fly Safe - Have Fun
Harry Francis
N93530
Craig Peterson <[EMAIL PROTECTED]> wrote:
Thanks for the reply Richard, sounds like there is some
commonality to this issue. I may try a dynamic balance just to see what
happens. I assume it can be undone...
Craig
----- Original Message ----
From: Richard Todd
To: [email protected]; cpetemn <[EMAIL PROTECTED]>
Sent: Wednesday, May 21, 2008 11:03:01 PM
Subject: Re: [ercoupe-tech] Engine/Prop Vibtation
Mine Too! Although when I first bought the plane it had excessive
vibration between 2300-2550. Being that I'm always using the upper RPM range,
it was very annoying. So I had the Dynamic Balance done. NOW my vibe is in the
2100-2300 range.
Richard
--- On Mon, 5/19/08, cpetemn <[EMAIL PROTECTED] com> wrote:
From: cpetemn <[EMAIL PROTECTED] com>
Subject: [ercoupe-tech] Engine/Prop Vibtation
To: ercoupe-tech@ yahoogroups. com
Date: Monday, May 19, 2008, 7:09 PM
I have noted on my recently acquired 415C, that the C-85 has a
moderate amount of vibration between 2100-2300 RPM. We re-positioned
the prop to the proper position on the hub, but no difference. The
motor mounts are good and there doesn't seem to be a lot of filing
that would put the prop out of balance. The next step would be dynamic
balancing. But, is there any known inherent vibration in the C-85's in
that rpm range? Any other thoughts?
Craig
N87018
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