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grs-pms(at)comcast.net
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 Posted: Fri Mar 16, 2007 2:50 pm Post subject: Water in jury struts |
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Water in the 701 jury struts is likely from condensation, rather than being rain-related. Years ago Ercoupe control pushrods suffered from condensation-related corrosion and failure, and these pushrods are completely inside the airplane. The pushrods could "breathe" thru their rod ends, and the resulting condensation was then trapped inside the pushrods. I had personal experience of such corrosion.
George
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ashontz
Joined: 27 Dec 2006
Posts: 723
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| Posted: Fri Mar 16, 2007 6:54 pm Post subject: Re: Water in jury struts |
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I remember reading in an old Experimenter mag that in the old days of tub and fabric airplanes they'd slosh linseed oil in the tube and then weld them together with no openings at all. But that's a welded structure. You're talking about bolts I think. You'd think with a bolted structure you'd have to have some sort of plug at the end that goes in the struct that the bolt goes through and keeps the tub from collapsing when bolted. Logically, wouldn't the drain hole be somehow in that plug, through the centerlne of the plug perhaps?
[quote="grs-pms(at)comcast.net"]Water in the 701 jury struts is likely from condensation, rather than being rain-related. Years ago Ercoupe control pushrods suffered from condensation-related corrosion and failure, and these pushrods are completely inside the airplane. The pushrods could "breathe" thru their rod ends, and the resulting condensation was then trapped inside the pushrods. I had personal experience of such corrosion.
George
do not archive
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grs-pms(at)comcast.net
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| Posted: Fri Mar 16, 2007 7:42 pm Post subject: Water in jury struts |
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My point was that the moisture in the air is enough to result in
condensation being trapped in closed members. It doesn't take exposure to
the rain, snow etc. Beyond that, the Ercoupe experience doesn't relate to
the jury strut problem.
The Ercoupe pushrods had a threaded self-aligning monoball fitting on each
end. The threaded portion of the fitting was bored out. Moist air could
make it's way past the ball and thru the bored out passage into the tube.
The solution was to fill the bored out hole with grease and drive a wooden
plug into the end to keep it sealed. Doesn't apply to the jury strut case,
I think. Being a 601 builder, I don't have a handle on the exact
configuration of the 701 jury struts, so I can't suggest a fix.
George
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