"Self Centering

Stuka Stunt Main Forum · 5 of 5 known posts recovered

parisjm · Jan 26, 2003 07:43 PM

Self Centering" bellcranks#0 source

Fellow Flyers,
I am looking for opinions on how these perform. Does the self centering feature work well and is there a benefit to reversing the up and down lines?
Was going to install a pair of Sig 4" in a pair of Orientals I am building to see how they worked, but opted for the standard style 3" because they seemed to fit a little better.
The only ones that I have seen that may still be out there are the Sig 4" and Brodak/J. Roberts. Any information would be appreciated.

John Paris

Jim T. · Jan 26, 2003 08:10 PM

RE: "Self Centering" bellcranks#1 source

I've used the self-centering bellcarnks with good results. Of course I did not understand what they were and always installed them backwards! If your lines come out the tip within 1/2-3/4 in of eachother, I don't think it makes a noticable difference which is in front.

Jim Thomerson

Ion Brazil · Jan 27, 2003 09:34 AM

RE: "Self Centering" bellcranks#2 source

LAST EDITED ON Jan-27-03 AT 09:34 AM (CDT)

What is this bellcrank?

Never heard about it.

Ion

The Kiwi · Jan 27, 2003 10:06 AM

Re: SIG's "Self Centering" bellcranks?#3 source

LAST EDITED ON Jan-27-03 AT 10:10 AM (CDT)

parisJM had said:>

> ... but opted for the standard style 3" because they seemed
>to fit a little better.
>
Reversing the older style bellcranks has been popular a long time, and may actually help a little in certain situations. But the geometry of the self-centering type now available from SIG has been criticized as having a negative effect on control throw. The details of that criticism elude me, but I personally have used 4" straight bellcranks and have liked the results in aerobatic applications.

Kiwi

P.S. Ion, if you will imagine a device shaped somewhat like a little boomerang, with the long arms the ends attached to the leadouts, and a short arm on the INSIDE of the center angle, you'll have a mental picture of it.

.
Kiwi

captcurt · Jan 27, 2003 12:19 PM

RE: Re: SIG's "Self Centering" bellcranks?#4 source

The geometry that makes them (self centering) work is when the leadout attachment points and the pivot center are not collinear.

There was a mention back a few threads ago by one of the west coast folks--perhaps Brett--. It indicated that they felt that the centering function interferred with the neutral setting of the controls --two "detents" if you will--but difficult to get into sync.

Curt