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Old 08-07-2019, 07:33 AM
pappa pappa is offline
Join Date: Feb 2010
Location: B'ham, Al
Posts: 31
Default Spar blocks

Starting on fuselage. My plans say to make blocks. They MUST be 1.438 inches to match the thickness of the spars. Just happened to put a dial caliper on the spars. Well, they all read thicker, The thickest reading.....1.448. .?????. How once everything is locked down and riveted, can a solid piece of metal that is larger than the hole it is supposed to go in, actually go into that hole. So, how did you'all do it. Your thoughts are greatly appreciated.
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Old 08-07-2019, 09:44 AM
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longranger longranger is offline
Join Date: Mar 2007
Location: 45G, Brighton, MI
Posts: 1,865

There’s more flex in the center section than you think. When building up my F-704 bulkhead I used a set of blocks from a previous RV-7 builder and even added a couple of layers of masking tape to give myself a little cushion. When I measured the center section and spar stubs in preparation for mating the wings to the fuselage for the first time I was horrified to find that the spar stubs were 10-15 mils thicker than the space in the bulkhead. I did some research and found that several builders before me had the same issue and ended up not having a problem mating the wings. Per the manual I lightly beveled the ends of the spars and greased them and the center section. It took a few minutes of jockeying to get the spars lined up with the center section, but once we did the spars slid right in.
Miles (VAF# 1238, Paid up as of 2018)
RV-7 TU 904KM (reserved)
Wings Fitted and Finish Kit on site

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Last edited by longranger : 08-07-2019 at 09:51 AM.
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Old 08-07-2019, 09:45 AM
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N804RV N804RV is offline
Join Date: May 2013
Location: Mount Vernon, Wa
Posts: 559

I bought the 1.445" spacers from Buller.
Ken W.
Mount Vernon, WA
2019 VAF Supporter
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Old 08-07-2019, 05:48 PM
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Vlad Vlad is offline
Join Date: Oct 2008
Location: Utah
Posts: 7,949

I used plywood. Doubled the pieces shaved to required thickness and left there for couple years. Drilled them later to secure the fuselage while transporting to the airport.

Where is N666BK?

Не имей сто рублей, а имей сто друзей.
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Old 08-07-2019, 06:57 PM
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wirejock wirejock is offline
Join Date: Oct 2005
Location: Estes Park, CO
Posts: 3,539
Default Buller

Originally Posted by N804RV View Post
I bought the 1.445" spacers from Buller.
Same here. Worked great.
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)
HS SB, empennage, tanks, wings, fuse, working finishing kit
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 08-07-2019, 08:13 PM
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bruceh bruceh is offline
Join Date: Mar 2008
Location: Ramona, CA
Posts: 2,281

I had a scrap piece of thin walled electrical conduit. I cut 4 pieces to rough length with a tubing cutter, then chucked it up in the drill press and filed it down to the correct length. Measured everything with calipers until it was a perfect fit. Wood will potentially change its length with humidity. These spacers worked great and didn't take up any unnecessary space in the spar carry-through area.
Bruce Hill
RV-9A N5771H flown over 700 hours!
APRS Tracking for KJ6YRP and New Flying Blog
2019 VAF donator
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Old 08-08-2019, 12:08 AM
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Wunderon Wunderon is offline
Join Date: Jun 2014
Location: Seattle (Edmonds) and Iowa
Posts: 190

PVC pipe cut and sanded to length.
Dave Grimmer
RV8 N46LG for Lynda
Edmonds WA
paid 2019
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