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Old 01-27-2019, 10:20 PM
Draker's Avatar
Draker Draker is offline
Join Date: Jun 2016
Location: Livermore, CA
Posts: 566
Default RV7-A model: Access to torque landing gear mount hardware

Looking ahead in the plans, us -A builder eventually need to install the WD-721 landing gear mounts against the F-704 center section bulkhead with bolts on the top and bottom of the mounts. Once the bottom skin is riveted on, getting good access to those bottom nuts will be challenging:

I will be able to get a long skinny wrench down there, but not any torque wrench I've seen. Before I button these bottom skins up, is there anything I can do to make this task less of a P.I.T.A. later? Is it acceptable to measure/set the torque on the bolt sides instead of the nuts for these?

I decided to install the F-663 control column mounts to the bulkhead before riveting the skin for this reason. But I don't think it would be possible (or wise) to install the gear mounts early too.
Ryan Drake
Livermore, CA
Donated 12/31/2020
RV-7A (N12VD): Finishing final tasks for engine-start and airworthiness!

Last edited by Draker : 06-16-2019 at 10:47 AM. Reason: Update image URL
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Old 01-27-2019, 11:45 PM
lr172 lr172 is online now
Join Date: Oct 2013
Location: Schaumburg, IL
Posts: 6,686

bolt/nuts can be tightened from either side. Washer goes on the end that will be rotated when tightening.

N64LR - RV-6A / IO-320, Flying as of 8/2015
N11LR - RV-10, Flying as of 12/2019
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Old 01-28-2019, 09:29 AM
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Raymo Raymo is offline
Join Date: Nov 2014
Location: Richmond Hill, GA (KLHW)
Posts: 2,340

What Larry said. Some have to be torqued from the back side of the spar. Add the drag torque to the required torque. In same cases, a large flat screwdriver is all you can manage to hold the nut stationary.
RV-7A - Slider - N495KL - First flt 27 Jan 17
O-360-A4M w/ AFP FM-150 FI, Dual PMags, Vetterman Trombone Exh, SkyTech starter, BandC Alt (PP failed after 226 hrs)
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Old 01-28-2019, 09:39 AM
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wirejock wirejock is offline
Join Date: Oct 2005
Location: Estes Park, CO
Posts: 4,756
Default Modifying tools

I modified a tool specifically for that purpose.

Nake sure the wing bolt holes are perfect. Two of mine were a tiny bit off. Nothing worse than trying t fit the wings and a bolt hits the gear weldment. I called Vans and was told to filebthe offending area.
Larry Larson
Estes Park, CO
wirejock at yahoo dot com
Donated 01/01/2021, plus a little extra.
RV-7A #73391, N511RV reserved (2,000+ hours)
Empennage, wings, fuse, finishing kit, now FWF
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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Old 01-28-2019, 11:12 PM
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jcarne jcarne is offline
Join Date: Jul 2016
Location: Worland, Wyoming
Posts: 1,978

Yep these were somewhat of a pain but not terrible. Don't forget that rogue hidden washer on the one on the right too.
Jereme Carne
RV-7A Flying as of 03/2021
Exempt but gladly paying!
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Old 01-29-2019, 08:47 AM
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Draker Draker is offline
Join Date: Jun 2016
Location: Livermore, CA
Posts: 566

Cool idea on that crow foot socket, maybe I'll try something like that. Good to know it's no problem torquing from the bolt side if I don't manage to get the socket down there. Wilco on the hidden washer, was reminded of that guy a couple of times so far.
Ryan Drake
Livermore, CA
Donated 12/31/2020
RV-7A (N12VD): Finishing final tasks for engine-start and airworthiness!
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Old 01-29-2019, 07:35 PM
kthom_441 kthom_441 is offline
Join Date: Mar 2010
Location: Caledonia, MI
Posts: 11
Default Modified Tool

While at that point on my 9A, I took a ratcheting box wrench and added a flat piece of steel, secured together with duct tape. This was the only wrench I had that didn't have too much of an angle to fit in there. I then torqued from the bolt side. I went a little tighter than normal due to the bold drag.
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Old 01-29-2019, 08:04 PM
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rjcthree rjcthree is offline
Join Date: Jan 2007
Location: Bay Village, OH
Posts: 1,001
Default Look, look again

Screwdriver, crows foot, duct tape, I?ll add long extension to the mix. I tended to look at those on the -9, with some forum prewarning, and usually had enough threads to washer both sides, which helped give the option of either nut or bolt turning. Turning the bolt against a stationary nut is sometimes all you have. Practicing against your torque wrench is a good idea to calibrate your hand, there will be one or two you?ll be stuck with feel.
RV-9A N183RC/90432: tip-up, O320H2, Ellison, Dynon D180, CPi2, Sen GA, at KLPR
RV-8 83718, wing kit, tanks done, with a four year plus plan - on hold due to home move
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Old 01-30-2019, 12:05 PM
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dwrichey dwrichey is offline
Join Date: May 2009
Location: Reedley, California
Posts: 85

Don't forget that if a crows foot is extended forward of the torque wrench that a "torque compensation" calculation needs to be performed (see AC43.13) and the value to be read on the wrench compensated accordingly. (If the crows foot is 90 degrees to the wrench handle then compensation is not required.)
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