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General control line discussion => Open Forum => Topic started by: Matt Neumann on June 24, 2024, 06:37:45 PM

Title: Brodak 4" belcrank.
Post by: Matt Neumann on June 24, 2024, 06:37:45 PM

Silly question.  I have a couple of 4" Brodak belcranks that look like the 4 inch version of the old Topflite 3 inch.  Has anyone have any strength issues with it with a 35 size plane?  I know there is the 4 inch PSP versions out there.  I have some of those but they are heavier.  Now I would certainly use the PSP version on the big boys.  But how about the smaller planes?  Has anyone have any strength issues with the 4" Topflite version?

Title: Re: Brodak 4" belcrank.
Post by: Motorman on June 27, 2024, 05:10:00 PM

What's the Brodak part # are they black or white?

Title: Re: Brodak 4" belcrank.
Post by: Tony Drago on June 27, 2024, 11:28:37 PM

4” Nylon Bellcrank by Brodak
SKU# BB-389
  White

Title: Re: Brodak 4" belcrank.
Post by: Motorman on June 28, 2024, 04:28:31 PM

Early on I've used the black version which I think is stronger fiberglass reinforced plastic. I drilled the holes out bigger to accept brass tubing horse shoe lead outs. I was worried it would fail there but it never has on my 46 powered Tanager or my Brodak40 powered Banshee. The clear/white nylon version I would never use on anything.

By the way, the three holes on the throw are: shortest=racing, middle=stunt, longest=combat.

These days I make all my bellcranks from phenolic G10 Garolite 1/8" plate. 

MM 8)