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Do you know what a throttle bellcrank IS?

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naumuk(at)alltel.net
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Posted: Thu Dec 11, 2008 3:58 pm Post subject: Do you know what a throttle bellcrank IS?

All-

     99.99% of the listers who  responded to my posts have no idea what I've been talking about. Attached  is the section from my HDS manual- THE BIG ROD ASSEMBLY THAT GOES OVER THE  HORIZONTAL FIREWALL BRACE! WHERE DO YOU POSITION THE UPRIGHTS TO ACCOMMODATE AN  MA3-SPA?? The cable for an MA3 comes from the right side of the centerline  looking at the firewall from the front. That's why I'm thinking I can just swap  this drawing end for end. 

     Sorry for the use of caps- I'm  not mad, just frustrated.

     Thanks.

                                                    do not archive

 Bill Naumuk

Townville, Pa.

HDS 601MG/Corvair  95%

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s.clive.richards(at)homec
Guest

Posted: Sat Dec 13, 2008 9:37 am Post subject: Do you know what a throttle bellcrank IS?

Bill

                I believe the drawing you show is the arrangement for a Rotax with dual bing  carbs & dual throttle.

 If you wish to use this arrangement then far as I  can see you can weld the bell crank uprights at any position you wish on  the drive shaft provided it clears equipment on your particular engine  arrangement the height of the bell crank uprights may require adjusting to  give the correct travel to what ever you drive the carb  with.

 We used a single throttle & Idle  cut-off sold by aircraft spruce similar to those fitted to C152s to directly  operate the carb. they are a belden type cable with solid cores the throttle  knob A800 has a friction lock & idle cut off A790 has a lock release knob  & vernier control

 In the Rotax arangement the carbs are opened  by a spring pulling on the belden cables from the bell crank, there is no idle  cutoff but a choke is fitted.

 Clive

 G CBDG 601HD 0-200 275Hrs

  do not  archive

 [quote]   ---

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naumuk(at)alltel.net
Guest

Posted: Sat Dec 13, 2008 10:29 am Post subject: Do you know what a throttle bellcrank IS?

Clive-

     Yes, it's for a Rotax. Since  there's only a single carb, the distance between the uprights can be less, and  the MA3 favors the opposite side of the centerline. 

     I never thought about the  height, but that can be adjusted at the last minute.

     It would seem the throttle  proper would need a minimum of cable for my set up, if any at all. Also, a  vernier would only be practical on the pilot's side. 

     People might think I'm spending  an inordinate amount of time getting the best information I can for the cockpit  layout, but I just, and I mean JUST was able to clear my battery cable when  reattaching the header tank straps for fit. I also had my battery cable  neatly tucked up under the left upper longeron using cable ties and had to  remove one. I didn't have the access to get my panel on and off any more. I'm  sure all the flying listers will agree- a minor lapse in panel layout will  result in big trouble down the line.

     Thanks.

                                                                                                   Bill

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