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Building Tips and technical articles. => Building techniques => Topic started by: sadams714441 on February 12, 2007, 01:13:25 PM

Title: Bell crank hole
Post by: sadams714441 on February 12, 2007, 01:13:25 PM

Which hole should i use when using a Brodak bellcrank on a Vector 40, the bellcrank that comes with it has 3 holes

Steve

Title: Re: Bell crank hole
Post by: Jim Morris on February 12, 2007, 02:08:29 PM

I would use the most inner hole Steve.

Title: Re: Bell crank hole
Post by: RC Storick on February 12, 2007, 02:40:14 PM

Quote from: sadams7144 on February 12, 2007, 01:13:25 PM

Which hole should i use when using a Brodak bellcrank on a Vector 40, the bellcrank that comes with it has 3 holes

Steve

You want it as closest to the same distance as the control horn hole you can get. That gives you 1 to 1 .

Like on a 4 inch bell crank set up. The line spacing is 4 inch as the bell crank. The flap horn is 1.25 and the hole in the bell crank is 15/16 off pivot. This slows the controls down a little. I hope I have explained this well enough? I would put it on the outer most hole. You can always narrow up the line spacing to slow the controls down.

Title: Re: Bell crank hole
Post by: sadams714441 on February 12, 2007, 06:22:33 PM

Robert
So use the outer most hole to make it 1to 1 ?  If you use the middle hole as it shows on the plans what does that make it?

Title: Re: Bell crank hole
Post by: RC Storick on February 12, 2007, 06:26:50 PM

Quote from: sadams7144 on February 12, 2007, 06:22:33 PM

Robert
So use the outer most hole to make it 1to 1 ?  If you use the middle hole as it shows on the plans what does that make it?

You must move the bell crank farther to get the same action the closer to the pivot you move the hole. If you are using a 3 inch bell crank and the second hole would probably act like a 4 inch bell crank. 6 to 1 half a dozen to the other. You can always move line spacing closer at the handle.

Title: Re: Bell crank hole
Post by: sadams714441 on February 12, 2007, 06:30:09 PM

So use the outer most hole and which hole on flap horn and which one on tail

Title: Re: Bell crank hole
Post by: Alan Buck on February 12, 2007, 06:40:41 PM

HI STEVE    I used the middle hole in the bellcrank upper hole on flaps and middle hole for elevator is on a vector arc hope this helps you    ALAN

Title: Re: Bell crank hole
Post by: sadams714441 on February 12, 2007, 06:57:52 PM

thanks how did it work out for you, I have one that I,am working on. But not ARC
Did you use ball links on bellcrank and horns