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Re: Europa-List: Re: Throttle cables with solid inner (piano wire)

Subject: Re: Europa-List: Re: Throttle cables with solid inner (piano wire)
From: Pete <peterz@zutrasoft.com>
Date: Thu, 11 Jun 2020 17:38:32
I wish I had taken picture now.

All I did was sand down the lead cable end and insert it into the re-used ni
cely made bushed (for the lever bolt), steel, allen-key locked fitting, addi
ng copious amounts of loctite prior to inserting the cable end and tightenin
g the small 4-40 allen-bolt to lock in the cable. Static tests showed that i
t was more than strong enough. I have not yet re-inspected it, but the throt
tle function is still perfect.  If the end did fail, the carb would go open t
hrottle, as airplanes should :-)

Cheers,
Pete

> On Jun 11, 2020, at 5:31 PM, Dave Allen <dave11allen@gmail.com> wrote:
> 
> =EF=BB
> I am interested to know how you made the adjustment to connect the cable a
t the throttle lever.
> 
> Dave
> 
>> On Thu, 11 Jun 2020 at 22:13, Pete <peterz@zutrasoft.com> wrote:
>> 
>> FWIW:
>> Understanding the reasoning behind the solid wire, I first replaced the b
roken solid (which by the way over-powered the carb=99s throttle sprin
g and stuck it at the 20% throttle level) with another.  Examining the routi
ng of the classic, the bends are too tight for solid wire, its friction too h
igh, and inducing fatigue cracking of the solid wire.  I sourced teflon-coat
ed bicycle stranded cable, modified the ends appropriately, lubed them up wi
th teflon spray and installed them.  Repeated tests of slamming the throttle
 forward did not induce any kinking in the throttle box, as the stock rotax s
prings have adequate tension to pull consistently.  I did however have to ti
ghten the throttle box friction pivot to keep the throttle from creeping fro
m the same spring tension. 
>> 
>> Bottom line, at least in my Classic, which has unavoidable tight bends, t
he throttles are smooth as silk, and the balancing was easy and has remained
 constant in the 50 hours so far (knock on wood).
>> 
>> Just wanted to throw my experience out there fwiw.  I=99m just ecst
atic that the solid wire broke on the ground (with a passenger) and I didn
=99t lose power in the climb.
>> 
>> Cheers and blue skies,
>> Pete
>> 
>> 
>> > On Jun 11, 2020, at 4:54 PM, h&amp;jeuropa <butcher43@att.net> wrote:
>> > 
att.net>
>> > 
>> > We installed solid wire throttle cables during our initial build. We di
d it because there were a couple instances where pilots tried to add throttl
e quickly and the wire cables kinked in the throttle box and jammed.
>> > 
>> > We tried to purchase piano wire to fit in the Europa supplied cables bu
t we were unable to straighten it so that it worked properly.  We purchased c
omplete cables from Aircraft Spruce and have never had a problem.  We did ha
ve to devise fittings at each end.   As Gilles points out, our carbs stay in
 sync from year to year too.
>> > 
>> > Jim & Heather
>> > 
>> > 
>> > 
>> > 
>> > Read this topic online here:
>> > 
>> > http://forums.matronics.com/viewtopic.php?p=496780#496780
>> > 
>> > 
>> > 
>> > 
>> > 
>> > 
>> > 
>> > 
>> > 
>> 
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