Aileron bellcrank

jkvincent · Post by **jkvincent** » Wed Apr 16, 2008 10:58

Jim
(also, anyone know the actual size of this pin?)

Jon B. · Post by **Jon B.** » Wed Apr 16, 2008 12:19

Is it possible that the 'pulley' is installed backward (upside-down?)? If so, then the cotter pin retainer would be on the correct side.

Jon B.

jkvincent · Post by **jkvincent** » Wed Apr 16, 2008 21:39

....???
The pin is in the housing, if you turn the pulley over, the pin is still in the front. My question is...
why isn't there a pin also in the back as there is in the front.
If you need one in the front, why don't you need one in the back?
Jim

Nathan K. Hammond · Post by **Nathan K. Hammond** » Wed Apr 16, 2008 22:36

It's a geometry issue. The rear cable (aka the Ballance Cable) always has tention on it because it's connected directly to each bellcrank without snaking through pullings or other diversions. Where as the lead cable (connects the stick to the bellcranks) has a mixing ratio so the ailerons move different amounts in their respetive direction: 28' UP and 18' DOWN. In simple terms; the rear cable is always tight and the front can get loose.

Grumps can probably describe it better.

nkh

Nathan K. Hammond · Post by **Nathan K. Hammond** » Wed Apr 16, 2008 22:41

Oh, it's an AN380-6-10 cotter pin, but you may not be able to find one that big in diameter. In that case use an AN380-4-10; the same you use on axel nuts.

nkh

marklamon · Post by **marklamon** » Wed Apr 16, 2008 22:59

JK, Nate is right on track. The way the front cable gets loose is due to the control stick(s) being pushed futher after the stop is felt.

jkvincent · Post by **jkvincent** » Wed Apr 16, 2008 23:06

Thanks, that makes sense, (works for me).
On the Cotter pin...I did have difficulty finding the same size as the old one,
the new one is slightly smaller but does serves the purpose.

Paul Agaliotis · Post by **Paul Agaliotis** » Thu Apr 17, 2008 09:39

Jim,
I use the MS24665-520. It's a tough pin to install but works well. If you can't find one local I can send you a couple.
Paul

jkvincent · Post by **jkvincent** » Thu Apr 17, 2008 09:55

Paul, ...thanks for the offer, is that a (regular) cotter pin?
If my wing is uncovered, what makes it tough to install?
Jim

Paul Agaliotis · Post by **Paul Agaliotis** » Thu Apr 17, 2008 10:04

Jim,
It's a Stainless pin. The large diameter and the material make it tough to bend. In the past people have installed this pin without trimming to size first. Once the easy side is bent it's tough to cut the opposite side.
Paul

jkvincent · Post by **jkvincent** » Thu Apr 17, 2008 11:13

Paul, ...thanks again for the offer,
I had to order several other items from Spruce and they had the -518, I'm assuming that's "ever-so-slightly" shorter,
which should be OK. ...do you agree? Jim

Paul Agaliotis · Post by **Paul Agaliotis** » Thu Apr 17, 2008 12:22

Jim,
The -518 are 2 5/8" and the -520 are 3".
Paul