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Old 02-10-2019, 07:58 PM
tjo tjo is offline
Join Date: Dec 2009
Location: La Center,wa
Posts: 203
Default Fuse Center section

In the instructions it says to bolt together the fwd and aft center sections with 1.438” blocks to test fit, then take the apart. Seems kind of a waste to fabricate wood blocks to this specific dimension just to put them together and take them apart. Is this really important? Is it really necessary? What is the goal? I appreciate any input.

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Old 02-11-2019, 06:56 AM
JackZ JackZ is offline
Join Date: Nov 2015
Location: neustadt ontario
Posts: 110

You need the spacers to ensure that your wing will fit nicely into the fuselage later. I borrowed some from a seven builder. They had dried a bit and the wings are very tight fit. Better yet is to make spacers out of aluminium that will remain stable. They are required.

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Old 02-11-2019, 08:37 AM
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wirejock wirejock is offline
Join Date: Oct 2005
Location: Estes Park, CO
Posts: 3,677
Default Buller

Buller makes spacers. He can make standard dimension or custom to the dimension of your wing spars. I used 1.444". .005" thicker than the spars. My wings slide in with just the right amount of effort. I left them in place till the fuse was riveted together.
Larry Larson
Estes Park, CO
wirejock at yahoo dot com
Donated 12/03/2019, plus a little extra.
RV-7A #73391, N511RV reserved (2,000+ hours)
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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 02-11-2019, 12:22 PM
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airguy airguy is offline
Join Date: Oct 2006
Location: Garden City, Tx
Posts: 4,947

Yep, you need the spacers. I made some out of aluminum for better dimensional tolerances. Find a buddy with a CNC and bribe him with a six-pack.
Greg Niehues - PPSEL, IFR, Repairman Cert.
Garden City, TX VAF 2020 dues paid
N16GN flying 600 hrs and counting! IO360, SDS, WWRV200, Dynon glass, 430W
Built an off-plan KC9A with too much fuel and too much HP. Should drop dead any minute now.
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Old 02-11-2019, 02:54 PM
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longranger longranger is offline
Join Date: Mar 2007
Location: 45G, Brighton, MI
Posts: 1,867

I borrowed spacers from another 7 builder. They were pieces of laminated wood milled to the corrrect thickness. I added a layer of blue painter’s tape to each side to ensure I wouldn’t have a problem fitting the wings. I’m glad I did, as I measured the spacing just before fitting the wings and came up with a 10-15 mil interference fit. (I think I tightened the temporary bolts a bit too much and compressed the spacers slightly). Surprisingly enough, after chamfering the inboard edges of the spars and greasing the spars and center section, there was enough give in center section that the wings slid in with a minimum of effort.
Miles (VAF# 1238, Paid up as of 2018)
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Old 02-11-2019, 07:58 PM
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bruceh bruceh is offline
Join Date: Mar 2008
Location: Ramona, CA
Posts: 2,301

I took some good old 1/2" electrical conduit tubing, cut it with a tubing cutter, then worked it down to the correct length on the grinder. Check the length with some calipers and stick them down between the front and rear sections and bolt them in place.

Since everything is prepunched, it is probably overkill, but at least you'll know that the wing spar will fit in there nice and tight.
Bruce Hill
RV-9A N5771H flown over 700 hours!
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