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Date: Thu, 26 Oct 2006 11:07:04 -0400
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From: Lorn H Olsen <lorn@dynacomm.ws>
Subject: Re: Prop Feathering

Kevin,

I had a prop overspeed at takeoff on my O-320 in March 2006. A  
"freeze" plug had come loose from the crankshaft and I lost oil  
pressure to the prop. I have heard of this happening in many other  
320 & 360's. The overspeed was not comfortable at about 3,500 RPM's  
with the prop tips supersonic. I just throttled back, turned around  
and landed. Now after a 2 compression tests a borescope and 2 oil  
analysis's, I am convinced that no major damage was done.

If my prop had gone to feather, there is no doubt, I would have crashed.

Lorn

> From: Kevin Kossi <kevin@airforcemechanical.com>
>
> Does anyone have any experience with the use of pressure reservoirs  
> to place a Prop. in full feathering mode when you have an engine  
> failure or loss of oil pressure?
>
> I am thinking about purchasing a Hartzell for my Legacy but that  
> model is not offered with counter weights or a full feathering option.
>
> I heard that one can install a pressure tank to store oil pressure,  
> kind of like a well tank. The tanks has a bladder or piston and  
> spring to store the energy that you can use to feather the prop  
> when all else fails by opening a valve.
>
>
> Thanks
>
> Kevin Kossi
> New York
> Legacy 70%
>
--
Lorn H. 'Feathers' Olsen, MAA, DynaComm, Corp.
248-345-0500, mailto:lorn@dynacomm.ws
LNC2, O-320-D1F, 1,200 hrs, N31161, Y47, SE Michigan