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General control line discussion => Open Forum => Topic started by: Jeff Traxler on July 08, 2017, 09:46:41 AM

Title: CF Forked Bellcrank Version 7
Post by: Jeff Traxler on July 08, 2017, 09:46:41 AM: This is the seventh version of a carbon fiber bellcrank I have been working on.After posting pics of several others and taking the suggestions of my fellow C/L modellers I think I may have a version that covers all the bases.It has 4" spacing and the throw is undrilled to allow for that favorite dimension.The forked ends are canted in at 45 degrees so even at full throw there is no binding.These will have FAA certified AN392 clevis pins instead of bolts to save weight and have a much lower profile.Mounts on a piece of 1/8" music wire.Needless to say they are very strong and virtually indestructable for our needs.I will post a second pic to show 45 degrees of throw
Title: Re: CF Forked Bellcrank Version 7
Post by: Jeff Traxler on July 08, 2017, 09:48:03 AM: 45 degree deflection.
Title: Re: CF Forked Bellcrank Version 7
Post by: Jim Hoffman on July 08, 2017, 11:57:04 AM: Nice Work.

Are you selling them? What do they weigh?

Jim Hoffman
Title: Re: CF Forked Bellcrank Version 7
Post by: Jeff Traxler on July 08, 2017, 01:07:55 PM: Hi Jim,I forgot the important part.The bellcrank came in at 12.5 gr.I am still waiting on the hardware I ordered so I can weigh it to get a final weight.These will be priced at $25.Not a bad price for insurance on a $700 powertrain and 500 hrs of work.
Title: Re: CF Forked Bellcrank Version 7
Post by: Will Hinton on July 08, 2017, 02:50:37 PM: Jeff's work on these and other things he has done is immaculate. 'Course, it doesn't play tunes, but that's okay. (His guitars do.)
Title: Re: CF Forked Bellcrank Version 7
Post by: Jeff Traxler on July 12, 2017, 07:22:44 AM: Just under 15gr. with the cable attach hardware added
Title: Re: CF Forked Bellcrank Version 7
Post by: Jeff Traxler on July 12, 2017, 07:24:21 AM: Low profile view of the forked end
Title: Re: CF Forked Bellcrank Version 7
Post by: Jeff Traxler on July 12, 2017, 07:27:49 AM: FAA certified hardware right from Wicks aircraft supply...............Sure is nice buying from them again!
Title: Re: CF Forked Bellcrank Version 7
Post by: Tim Wescott on July 12, 2017, 08:55:22 AM: I see no boss for the pushrod attach point?
Title: Re: CF Forked Bellcrank Version 7
Post by: Motorman on July 12, 2017, 10:52:43 AM: Can we name it the Batman bellcrank or the Batcrank? Riddle me this, could it be made thicker at the pivot? Holy carbon fiber Robin, I don't think he'll do it.

MM
Title: Re: CF Forked Bellcrank Version 7
Post by: Avaiojet on July 12, 2017, 11:06:42 AM: Quote from: Motorman on July 12, 2017, 10:52:43 AM
Can we name it the Batman bellcrank or the Batcrank? Riddle me this, could it be made thicker at the pivot? Holy carbon fiber Robin, I don't think he'll do it.

MM

I would have made it in two pieces and laminated them. LL~ LL~ LL~
Title: Re: CF Forked Bellcrank Version 7
Post by: Jeff Traxler on July 12, 2017, 11:56:43 AM: Quote from: Tim Wescott on July 12, 2017, 08:55:22 AM
I see no boss for the pushrod attach point?

That is left to the individual user.I had requests for 3/4",7/8ths",1".Easy enough to drill and sleeve if needed.
Title: Re: CF Forked Bellcrank Version 7
Post by: Jeff Traxler on July 12, 2017, 12:05:29 PM: Quote from: Motorman on July 12, 2017, 10:52:43 AM
Can we name it the Batman bellcrank or the Batcrank? Riddle me this, could it be made thicker at the pivot? Holy carbon fiber Robin, I don't think he'll do it.

MM

NO!!When properly mounted there should be very little to no stress that requires it to be any thicker.Sorry to have to point out thickness adds weight!!!
Title: Re: CF Forked Bellcrank Version 7
Post by: Randy Cuberly on July 12, 2017, 02:29:55 PM: Looks very good....When are they going to be ready for sale. I would definitely be interested in a couple!

Randy Cuberly