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  #1  
Old 01-30-2021, 12:35 PM
amekler amekler is offline
 
Join Date: Aug 2009
Location: Gilford,NH
Posts: 116
Default control rod scrapes the fuel pump

My flaperon control rod scrapes the fuel pump. (this is the updated fuel pump)
Any idea of how to remedy this?
Alan
N603NH(reserved) RV12 50% done?
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  #2  
Old 01-30-2021, 10:50 PM
Tacco Tacco is offline
 
Join Date: Jan 2017
Location: White Salmon, WA
Posts: 213
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It is a close fit. There are a couple of things to check. When I had this problem, I found my flap handle to control mixer connecting rod was not the right length. Also check the main flaperon tubes for the correct length.
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RV-12 N12SM
Builder 121036
White Salmon, WA

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  #3  
Old 01-31-2021, 05:06 AM
amekler amekler is offline
 
Join Date: Aug 2009
Location: Gilford,NH
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Steve,
Will check. This is with the wings off. Does that make any difference?
I haven't set the the stabilator cable tension yet so the control stick moves a lot.
This is the updated fuel pump so I don;'t know if it is taller than the original pump.
Alan
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  #4  
Old 01-31-2021, 10:44 AM
Tacco Tacco is offline
 
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Location: White Salmon, WA
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Not having the wings on or the elevator cables tension should not make a difference in my opinion. I too have the upgraded pump. Once again, The length of the push rods, including the flap handle push rod are crucial. I'd remove them and measure them precisely. I assume that the interference occurs with the flap handle set in a detent (?) ... check it in all three positions.

The geometry is very subtle. But the length of the rods causes the two main flaperon push rods to sit higher or lower just slightly. That was my problem anyway. My flap handle pushrod was longer by an 1/8 of an inch and my flaperon push rods were also of just slightly. When I corrected these, the fuel pump interference problem went away.
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RV-12 N12SM
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White Salmon, WA

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  #5  
Old 01-31-2021, 12:54 PM
amekler amekler is offline
 
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Location: Gilford,NH
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thanks Steve will measure .
thought I followed the instructions
Alan
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  #6  
Old 01-31-2021, 09:09 PM
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rvbuilder2002 rvbuilder2002 is offline
 
Join Date: Jul 2005
Location: Hubbard Oregon
Posts: 9,293
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Quote:
Originally Posted by amekler View Post
My flaperon control rod scrapes the fuel pump. (this is the updated fuel pump)
Any idea of how to remedy this?
Alan
N603NH(reserved) RV12 50% done?
This is usually caused by the flapperon push/pull tubes being not quite the proper length when the flapperon torque tubes were originally drilled (if they are just a bit short the horns on the torque tubes will be angled fwd a bit too much which will cause contact when it pivots fully fwd.
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Hubbard, Oregon
RV-6A (aka "Junkyard Special ")
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  #7  
Old 02-01-2021, 03:59 AM
amekler amekler is offline
 
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Location: Gilford,NH
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Scott,
What's the fix? New torque arms?
Alan
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  #8  
Old 02-01-2021, 09:33 AM
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DaleB DaleB is offline
 
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Location: Omaha, NE (KMLE)
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Thatís what I had to do. Only one was drilled off from where it should have been, so I replaced that one. Problem solved.
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Omaha, NE
RV-12 # 222 N980KM "Screamin' Canary" (bought flying)
Fisher Celebrity (under construction)
Previous RV-7 project (sold)
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  #9  
Old 02-01-2021, 10:57 AM
NinerBikes NinerBikes is offline
 
Join Date: Dec 2018
Location: Granada Hills
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Quote:
Originally Posted by amekler View Post
Scott,
What's the fix? New torque arms?
Alan
Sounds like a new torque arm or arms, cut to the proper, longer length.

Measure twice, cut once, is what we say in construction.
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2012 RV-12, #212 N72DJ KWHP based.
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  #10  
Old 02-01-2021, 12:47 PM
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rvbuilder2002 rvbuilder2002 is offline
 
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Location: Hubbard Oregon
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Quote:
Originally Posted by amekler View Post
Scott,
What's the fix? New torque arms?
Alan
If you use care doing the drilling (since the holes in the inboard portion wont be smaller pilot holes anymore) you can just replace the outboard portion While being certain that the push/pull rods aren't any bit too short.
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Opinions, information and comments are my own unless stated otherwise. They do not necessarily represent the direction/opinions of my employer.

Scott McDaniels
Van's Aircraft Engineering Prototype Shop Manager
Hubbard, Oregon
RV-6A (aka "Junkyard Special ")
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