One partial solution to the throttle cable problem would be to fit
microswitches to the throttle arm at the carburettor end and connect to 2
warning lights. At least that way you would know if the throttles were fully
open on takeoff. Arguably you could confirm this with the rev counter but
small differences in throttle setting might not register.
Clearly this would not solve the kinking problem in an emergency situation -
I have had it happen to me but only on the ground.
One point worth a mention is that the lubricants used on the cable have a
great effect on the smoothness of operation. Thick oils and greases tend to
have a detrimental effect, whereas thin oils/ WD40 etc seem to work best.
The only problem is the need to reapply frequently.
The same logic applies to the ball joints on the rod ends. Thin oils give a
much freer control system.
CP
----- Original Message -----
From: "Bob Harrison" <ptag.dev@ukonline.co.uk>
Subject: RE: Throttle Cable Considerations
> Hi! All.
> I'm also sorry to hear of your incident, John.
> The power boat industry uses "Morse" cable for such applications. It
really
> "is the business"!
> It is designed to push as well as pull. I could never quite understand why
> it hasn't been used
> on any a/c I've seen. However ,I guess I'm answering my own question, the
> price is reflective of the product. But in the light of John's experiences
> cheap at the price.?
> Regards
> Bob Harrison. G-PTAG
>
> -----Original Message-----
> From: owner-europa@post.aviators.net
> Subject: Re: Throttle Cable Considerations
>
>
> Hi, John. Sorry to hear about your misfortune, but thanx for posting
> it. When prelim info in U.S. is published, it's often not very
> informative and sometimes hint at pilot error.
>
> The kinking of the inner cable sure seems a function of how fast you
> push forward. I know one can train one's self to move it slowly, but
> that won't guarantee the same reaction in an tight situation. Meaning
> a fix is best?
>
> There are Teflon-lined, (multi-strand) cable assemblies that don't
> expose the inner cable, but rather are inside a tube that both
> articulates and slides inside a larger one. Cannot kink. Surgery on
> the fiberglass housing would be necessary, as also attach hardware
> both ends. 84" long, 10/32 threaded ends, is about $32; cut it in
> two, but guard against unraveling the inner cable. Some fancy work
> involved, but it might be advisable? I have a Oshkosh Fly Market
> sample, and they're almost zero friction, just a bit heavier than the
> kinky ones we have.
>
> Regards,
> Fred F., A063
>
>
> J Moran wrote:
> >
> > I recently had a landing accident in N44EU which was
> > precipitated by power failure during a go around; N44EU, a Mark
> > 1, incurred "substantial damage" (FAA assessment). I was
> > fortunate to walk away with minor bruises and scratches.
> >
> > In analyzing the accident later, I concluded from all the
> > details of the power failure that the most likely cause was that
> > the throttle cables kinked within the throttle block when I
> > attempted to rapidly apply full throttle, effectively locking the
> > power at the existing setting.
>
>
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