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07-11-2016, 06:30 PM
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Join Date: Nov 2008
Location: Shreveport, LA
Posts: 1,002
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Throttle quadrant without a bellcrank?
I have been trying to figure out a way to use a throttle quadrant (where the cable connects to the quadrant under to rotation point of the friction lock)without the use of bell cranks to reverse the direction of the throw.
Is there a way this can be done for a carburated Lycoming 0-360 with vertical induction?
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07-11-2016, 07:10 PM
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Join Date: Jan 2005
Location: SC
Posts: 12,887
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I have one of Dayton's throttle quadrants and no bell crank in my O-360 powered -9.
No bell crank required.
I'm not sure I understand your question.
You connect the cable to the TQ so when it comes back, it pulls the cable. On the carb, pulling the lever aft closes the throttle and same for the mixture and prop.
The only mod I had to make was I had to drill a second hole on the Throttle lever.
__________________
Bill R.
RV-9 (Yes, it's a dragon tail)
O-360 w/ dual P-mags
Build the plane you want, not the plane others want you to build!
SC86 - Easley, SC
www.repucci.com/bill/baf.html
Last edited by N941WR : 07-11-2016 at 07:14 PM.
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07-11-2016, 08:00 PM
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Join Date: Nov 2008
Location: Shreveport, LA
Posts: 1,002
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when you attach the cable to this TQ in the picture, and you move the throttle forward, it pulls the cable backwards, ie closes the throttle. Same for the mixture.
Last edited by blueflyer : 07-11-2016 at 08:02 PM.
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07-11-2016, 08:03 PM
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Join Date: Jan 2005
Location: SC
Posts: 12,887
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You are using the wrong TQ. Sell that one and get a DJM quadrant. On the DJM quadrant, the cables attach above the pivot point, not below it.
Here is a picture of mine:
 
(Click to Enlarge)
there are a couple of systems you don't want to complicate; ignition, fuel, and engine controls. By adding a bell crank to your engine controls, you are complicating things.
I'm not sure which RV you are building but if it is a side-by-side with the throttle in the center, you want the friction lock on the right side. If it is a tandem model with left hand throttle, then the friction lock should be on the right.
Good luck!
__________________
Bill R.
RV-9 (Yes, it's a dragon tail)
O-360 w/ dual P-mags
Build the plane you want, not the plane others want you to build!
SC86 - Easley, SC
www.repucci.com/bill/baf.html
Last edited by N941WR : 07-11-2016 at 08:07 PM.
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07-11-2016, 08:07 PM
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Senior Curmudgeon
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Join Date: Sep 2005
Location: Dayton Airpark, NV A34
Posts: 15,408
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Note the hole location in the DJM unit. It is above the pivot, thus no bellcrank needed.
Can you just rotate the arm on the carb/servo 180*??
__________________
Mike Starkey
VAF 909
Rv-10, N210LM.
Flying as of 12/4/2010 
Phase 1 done, 2/4/2011
Sold after 240+ wonderful hours of flight.
"Flying the airplane is more important than radioing your plight to a person on the ground incapable of understanding or doing anything about it."
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07-11-2016, 08:09 PM
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Join Date: Jan 2005
Location: SC
Posts: 12,887
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Quote:
Originally Posted by Mike S
...
Can you just rotate the arm on the carb/servo 180*??
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It depends on where the stops are on the carb. On my carb, that isn't possible.
__________________
Bill R.
RV-9 (Yes, it's a dragon tail)
O-360 w/ dual P-mags
Build the plane you want, not the plane others want you to build!
SC86 - Easley, SC
www.repucci.com/bill/baf.html
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07-11-2016, 08:21 PM
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Join Date: Apr 2013
Location: Lk Havasu City, AZ
Posts: 168
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Quote:
Originally Posted by N941WR
Here is a picture of mine:
(Click to Enlarge) |
Bill,
Do you have a picture of how you hold the cable housings near the quadrant?
I'm planning a similar setup and looking for ideas or reference.
Thanks,
__________________
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Mark Curley
RV-6 (under construction)
dues paid 2020
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07-11-2016, 08:23 PM
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Join Date: Nov 2008
Location: Shreveport, LA
Posts: 1,002
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I can't rotate the mixture arm.
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07-11-2016, 08:57 PM
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Join Date: Jan 2005
Location: SC
Posts: 12,887
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Quote:
Originally Posted by spark68
Bill,
Do you have a picture of how you hold the cable housings near the quadrant?
I'm planning a similar setup and looking for ideas or reference.
Thanks,
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There are more pictures on my website, but I think this is the one you are looking for.
(click to enlarge)
What that doesn't show is the safety wire looped around the adel clamp and cable like this.
Others have used a section of AA to make a bracket to secure the cable with. I thought about doing this but wasn't sure where to place the bracket and the adel clamps have worked very well.
__________________
Bill R.
RV-9 (Yes, it's a dragon tail)
O-360 w/ dual P-mags
Build the plane you want, not the plane others want you to build!
SC86 - Easley, SC
www.repucci.com/bill/baf.html
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