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03-10-2015, 11:19 PM
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Join Date: Aug 2010
Location: Brookshire, TX
Posts: 1,036
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W-818 aileron pushrod length
While doing some research on other stuff, I ran across a handful of instances where RV-7 guys built their -718 pushrods (the ones from the cockpit to the bellcranks) to spec, only to find down the road that they were too short. Has anyone run into a similar issue with an RV-8?
I finished up my short pushrods tonight, and I'd like to go ahead and build the long pushrods and have them "stored" attached to the bellcranks in the wings, but I'd rather not find out they're useless in a year or so.
Thoughts? Experiences?
__________________
Philip
-8 fuselage in progress (remember when I thought the wing kit had a lot of parts? HAHAHAHAHA)
http://rv.squawk1200.net
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03-10-2015, 11:58 PM
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Join Date: Jan 2005
Location: Battle Ground, Washington
Posts: 138
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Plans worked fine for me
I have built two RV-8's and followed plans for aileron pushrods lengths. Worked perfectly for me.
Dan Miller
Battle Ground, WA
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03-11-2015, 06:37 AM
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Join Date: Jun 2010
Location: Bettendorf, IA
Posts: 140
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Follow Plans
Worked fine for me too.
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Charlie Hammes
RV-8, N525RV Flying
RV-8, N208CH in process
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03-11-2015, 07:31 AM
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Join Date: Feb 2012
Location: Wilsonville/Aurora KUAO Oregon
Posts: 746
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Me too
Quote:
Originally Posted by cdmiller
I have built two RV-8's and followed plans for aileron pushrods lengths. Worked perfectly for me.
Dan Miller
Battle Ground, WA
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No problem with the plans I have found. (Hello Dan)
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Bruce, Katie, Hana and RV-8 HulaGirl
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03-11-2015, 08:20 AM
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Join Date: Nov 2014
Location: Fayetteville nc
Posts: 23
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I'm building a 7a and my pushrods were too short. I built two new ones about 5/16" to 3/8" longer.
I don't want there to be any chance a pushrod can loosen and untread itself!
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03-11-2015, 08:38 AM
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Join Date: Oct 2005
Location: Estes Park, CO
Posts: 3,947
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Pushrods
Quote:
Originally Posted by EllisMcgaughy
I'm building a 7a and my pushrods were too short. I built two new ones about 5/16" to 3/8" longer.
I don't want there to be any chance a pushrod can loosen and untread itself!
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7a here too. Mine isn't flying but I took your advise and made mine 3/8" longer. I made the short tubes longer too. I just cut the tube in half. Once rigged, I rotated the rod all the way to the end and it couldn't fall out. Good test I learned on VAF.
__________________
Larry Larson
Estes Park, CO
http://wirejockrv7a.blogspot.com
wirejock at yahoo dot com
Donated 12/03/2019, plus a little extra.
RV-7A #73391, N511RV reserved (2,000+ hours)
HS SB, empennage, tanks, wings, fuse, working finishing kit
Disclaimer
I cannot be, nor will I be, held responsible if you try to do the same things I do and it does not work and/or causes you loss, injury, or even death in the process.
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03-11-2015, 11:19 AM
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Join Date: Jul 2013
Location: US
Posts: 2,251
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Built to plans and it's fine (can't unscrew itself from the rod ends).
I don't understand why some people end up short and others don't...assuming everyone is building to the same plans, how can this be?
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03-11-2015, 10:07 PM
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Join Date: Aug 2010
Location: Brookshire, TX
Posts: 1,036
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Quote:
Originally Posted by RV7A Flyer
Built to plans and it's fine (can't unscrew itself from the rod ends).
I don't understand why some people end up short and others don't...assuming everyone is building to the same plans, how can this be?
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That's what I wonder, too. I don't want to throw out a blanket accusation of foul-ups on the part of the builders, but it seems like the most likely cause to me.
Anyway, I went ahead and assembled the things tonight. These were a cakewalk after doing the short rods with the solid rivets! Plus, after I was done, I had to temporarily install the bellcrank and both rods, then sit at the wing root and make the aileron move.
Thanks for the feedback!
__________________
Philip
-8 fuselage in progress (remember when I thought the wing kit had a lot of parts? HAHAHAHAHA)
http://rv.squawk1200.net
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06-04-2015, 11:48 PM
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Join Date: Sep 2007
Location: BC
Posts: 1,674
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Mine were built according to the plans and are also too short UNLESS one is to accept that 5/16" insertion depth of the threaded portion (3/8" diameter) into the threaded cone is acceptable, or allow the control sticks to lean towards each other.
I seem to recall that insertion depth should be 1.5X diameter but cannot find that stated anywhere. Can anyone point me to a documented standard?
Bevan
__________________
RV7A Flying since 2015
O-360-A1F6 (parallel valve) 180HP
Dual P-mags
Precision F.I. with AP purge valve
Vinyl Wrapped Exterior
Grand Rapids EFIS
Located in western Canada
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06-05-2015, 05:02 AM
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Join Date: Mar 2011
Location: zeeland michigan
Posts: 127
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tubes
look at the print there is two length given one for the tube and one for the total length of the finished tube center of bearing hole to center of the other bearing hole you will find the bearings thread into the cone at less then some people think is acceptable to get the total length if you cut the tube to the length given for the tube only
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built rv-4 started 1987 finished 1996 now building rv-7, fitting cowl
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