Cox control line three line throttle

Yes, I have a few Brodak/J Roberts bellcranks. I fly carrier with them, but I think they would be to big for a 1/2A. I'll try to get a picture of the plane posted when I get home. This was a complete Cox product, it looked to be RTF handle and all. If I could get the Cox/ 1/2A bellcrank that would be GREAT!

Duke:

Scaling-down a J. Roberts 3-line bellcrank for 1/2A application would be a feat of engineeing beyond most capabilities here including mine. Personally, I'd rather opt for a 2.4 gig ESC assist to operate the throrrle function.

Dave
Good to hear from you. I've not moved into the 2.4hz throttle stuff yet. Some of the guys are moving that way since the rule change this year, but many are outraged at the thought of going R/C. This was a RTF Cox, I believe it was a Ryan ST3. Last year at a Portland contest a guy flew a 1/2A with an extra line attached to the tail wheel. He would pull on the thrid line to change the angle of the plane to slow it down. This is illegal for contest flying. I would live to go down this year with a true three line 1/2A carrier plane and get them interested in a new Northwest carrier class. Like we ned another. I'd like to see one of these Cox bellcranks if anyone has one.

Sweet! I found a site that had a bunch of pictures of a Ryan ST3, including the bellcrank. It looks like a plastic J Roberts. It was almost as wide as the wing from LE to TE. I think I can make a small Brodak C-22 work. I think I will modiy an existing slab wing model for proof of concept. I think I have a Beginner Ringmaster dying for a R/C engine!

I might just make a bellcrank out of two 2" perfect bellcranks. Going old school!

Years long past we just stacked a 90 degree aileron bellcrank and light spring over the elevator bellcrank on balsa planes with exhaust throttled .049s. The light spring cuz the cox return spring did not overcome flying line drag

Mark
Is that one yours? I saw one earlier today. That's So Sweet!

its from the web site, i thought i'd post it so everybody could see what it looked like.

THanks, the one I found wouldn't let me copy and paste it. I'm going to town today and I'll go by the hobby shop to get two small bellcranks and make one for the proto type plane.