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09-02-2015, 12:45 PM
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Join Date: Feb 2005
Location: Leawood, KS
Posts: 275
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I have one similar
Someone bumped my flap while I was working in the hangar one day. I was lucky that I heard the binding of the flap motor when I went to raise them and prevented major damage. I still had to borrow Van's special tool to get the back edge of the wing skin back down a little bit. It could have been disastrous if you look at some of the older postings with wrinkled wing skins on top of the wing.
I use the Showplanes positioning system (works great!) so I built something very similar to Paul's setup to limit the total travel and have had no problems since then.
Andy
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Andy Cobb
RV-7A
MO00 & KLXT
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09-20-2015, 07:15 AM
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Join Date: Aug 2006
Location: Northwest Arkansas
Posts: 102
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I opened up the actuator and relocated the split pin as mentioned by Kent N in a previous post. I moved it 5/8" which yielded a reduction in flap travel of approx five degrees. With full down flap I am at 39 degrees and have 7/16" still engaged under the top wing skin.
I couldn't get a drill bit to start drilling on the shaft. Suspecting it was hardened, I took it to a machinist friend of mine who used his milling machine to drill the 3/32" hole. The shaft was case hardened. He secured both ends in a fixture so it wouldn't move which was also part of my problem on the drill press.
It took a little time, but no limit switches or wiring and up and down travel are right where I want it.
__________________
Gary Moore
Northwest Arkansas
Working on the firewall forward....
RV-7, N742GM (Reserved)
http://mykitlog.com/mhead
Donated 9/9/19
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11-10-2016, 08:49 AM
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Join Date: Jun 2016
Location: Arizona
Posts: 4
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I have a RV6A that I purchased a few months ago. I'm doing the first condition inspection and one thing I also noticed was the electric flap travel was way too long causing over extensions on both ends. Opening up the jackscrew and relocating the roll pin did the trick. I shortend the travel by 1inch which gave me a 40 degree extension. This is much better than trying to limit extension with switches and brackets. The jackscrew is hardened so I took it to the local machine shop for the new hole.....10 bucks later.... I had a new 3/32nd hole for the roll pin.
Thanks for the info from the two RVers who did it before......it's a great solution to a problem Vans should look into.
Russ
__________________
Russ
RV6A
Kitfox IV
Needle, Ball and Airspeed
And a little GPS
Last edited by russell320 : 11-10-2016 at 09:26 AM.
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11-10-2016, 10:44 AM
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Join Date: Dec 2009
Location: Montreal
Posts: 1,456
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thanks for posting this. I guess I will do this once I have the wings on and find out my flap travel. Or I might add some length to the arm on the yoke, which ever is easier. I have seen several bent flap skins on RVs. It is an issue. I can understand that VANS buys some standard part that probably worked on their prototype, but all of those early airplanes were a bit different. We are homebuilders, we can adapt!
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Scott Black
Old school simple VFR RV 4, O-320, wood prop, MGL iEfis Lite
VAF dues 2020
Instagram @sblack2154
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11-10-2016, 01:01 PM
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Join Date: Jul 2005
Location: Hubbard Oregon
Posts: 9,035
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Quote:
Originally Posted by russell320
I have a RV6A that I purchased a few months ago. I'm doing the first condition inspection and one thing I also noticed was the electric flap travel was way too long causing over extensions on both ends. Opening up the jackscrew and relocating the roll pin did the trick. I shortend the travel by 1inch which gave me a 40 degree extension. This is much better than trying to limit extension with switches and brackets. The jackscrew is hardened so I took it to the local machine shop for the new hole.....10 bucks later.... I had a new 3/32nd hole for the roll pin.
Thanks for the info from the two RVers who did it before......it's a great solution to a problem Vans should look into.
Russ
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FYI, the flaps deflect upward by aerodynamic loading so if you measure the travel in the hangar at 40 deg., you will not have that much in flight.
__________________
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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11-10-2016, 01:12 PM
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Join Date: Jun 2016
Location: Arizona
Posts: 4
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I agree.....inflight it looks like about 37 degrees based on my flap markings....which is fine with me. The piece of mind comes on the ground, with the flaps extended, and are accidentally bumped and I don't catch it. Hasn't happened yet. But with the way the previous owner had them set, it would have.
__________________
Russ
RV6A
Kitfox IV
Needle, Ball and Airspeed
And a little GPS
Last edited by russell320 : 11-10-2016 at 01:14 PM.
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11-10-2016, 05:49 PM
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Join Date: Dec 2014
Location: hilltop lakes' Texas
Posts: 135
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Flaps
How does the limit switch Help the bumped flap scenario or did I overlook something?
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11-11-2016, 07:53 AM
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Join Date: Jun 2016
Location: Arizona
Posts: 4
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The limit switch, at least in my case, would have electrically stopped the flaps from extending too far due to the flap drive travel being too long. And with me, I leave the flaps down for ease of entry into and out of the airplane. People tend to "bump" the flaps getting in or out which may push the flap out of it's position. The primary problem is the flap drive is too long. IMO, it's better to mechanically limit the flap travel. This may be unique to the RV6.....I'm new to the RV scene.
__________________
Russ
RV6A
Kitfox IV
Needle, Ball and Airspeed
And a little GPS
Last edited by russell320 : 11-11-2016 at 07:58 AM.
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11-11-2016, 12:02 PM
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Join Date: Mar 2007
Location: Sonoma County
Posts: 3,821
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Quote:
Originally Posted by russell320
I have a RV6A that I purchased a few months ago. I'm doing the first condition inspection and one thing I also noticed was the electric flap travel was way too long causing over extensions on both ends. Opening up the jackscrew and relocating the roll pin did the trick. I shortened the travel by 1inch which gave me a 40 degree extension. This is much better than trying to limit extension with switches and brackets. The jackscrew is hardened so I took it to the local machine shop for the new hole.....10 bucks later.... I had a new 3/32nd hole for the roll pin.
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If you alter the jackscrew, it should be labeled as to what was done so it doesn't get replaced with a stock part later on.
If a limit switch is used, then the jackscrew can be switched out as a direct replacement.
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VAF #897 Warren Moretti
2019 =VAF= Dues PAID
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11-11-2016, 12:33 PM
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Join Date: Jun 2016
Location: Arizona
Posts: 4
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That's a great point. I'll label accordingly.
__________________
Russ
RV6A
Kitfox IV
Needle, Ball and Airspeed
And a little GPS
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