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Old 09-22-2009, 09:31 PM
Ironflight's Avatar
Ironflight Ironflight is offline
VAF Moderator / Line Boy
Join Date: Jan 2005
Location: Dayton, NV
Posts: 12,886
Default Tip: Never, Ever, Ever Assume?.

So there I was, a nice pleasant evening, all by myself, fabricating a couple of fuel tank close-out plates for the RV-3 (Louise gave me permission to fabricate these in her absence, since in most of the sophisticated kits, they come pre-cut and punched, and I enjoy bringing parts from raw stock to ?kit? status). For some reason, we didn?t even get material for them with our QB wings, but a neighbor had a nice chunk of .063 to cut some 6? circles out of, and I was on my way. I used some translucent graph paper on the root ribs to transfer the location of the close-out nut plates from the tank to the plate, and marked the location for the fuel pick-up and the fuel level senders. Working on the left plate (because it was the one shown on the drawing) I cleverly used the fuel sender gasket to mark the location of the marking holes, because I remembered from my previous build that the holes are NOT evenly spaced ? they are spaced funny to prevent you from installing the sender upside down or sideways.

In production mode, I then moved to the right plate and marked the same things, flipping the gasket for the sending unit over to make sure it was going to be right side up.

[OK, stop here?see my assumption? I ASSUMED that the bolt hole pattern on the right sender was a mirror image of the left sender?.WRONG!! Not only do they drill the holes in an irregular pattern so that you can?t mount the sender the wrong way, they have SEPARATE patterns for the left and right senders?.]

Out came the drill in production mode, and sure enough, when the chips had flown and the holes produced, the right sender mounting holes wouldn?t line up in any orientation. Of course, this meant that I got to have the fun of starting over from scratch on the right plate ? fortunately, I had enough extra material to cut out one more 6? circle. And fortunately, I had nothing else to work on, so this gave me an excuse to spend another half hour in the shop ? quality time!

Tip, Lesson, What-have-you?.Never assume that the Right and Left of ANYTHING are going to be mirror images. Many times, they will be, but just when you get on a roll?..Van?s will snap you back to reality!

Paul F. Dye
Editor at Large - KITPLANES Magazine
RV-8 - N188PD - "Valkyrie"
RV-6 (By Marriage) - N164MS - "Mikey"
RV-3B - N13PL - "Tsamsiyu"
A&P, EAA Tech Counselor/Flight Advisor
Dayton Valley Airpark (A34)
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Old 09-22-2009, 10:15 PM
the_other_dougreeves the_other_dougreeves is offline
Join Date: Jan 2006
Location: Dallas, TX (ADS)
Posts: 2,180

There's a great poster that hangs in our club's towplane hangar shop. It's not safe for VAF, but it involves a woman in a tennis skirt outfit and in large letters, the word "CHECK"....

Doug "The Other Doug Reeves" Reeves
CTSW N621CT - SOLD but not forgotten
Home Bases LBX, BZN
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Old 09-23-2009, 03:09 PM
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rv7boy rv7boy is offline
Forum Peruser
Join Date: Jan 2005
Location: Austinville, Alabama
Posts: 2,498
Default Reality hits you really hard sometimes.

I confess I was so naive when I started my RV-7 that I thought I would not have to drill out any rivets and that I would not have to re-make any parts.

Then reality bonked me on the noggin'!

Oh well, I have a special place for messed up aluminum parts. It's those red plastic Folger's coffee containers over there on the bottom shelf. There's always hope that some of them can be used to re-make parts I may mess up later.
Don Hull
RV-7 Wings
KDCU Pryor Field
Pilots'n Paws Pilot
N79599/ADS-B In and Out...and I like it!

?Certainly, travel is more than the seeing of sights;
it is a change that goes on, deep and permanent, in the ideas of living." Miriam Beard
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Old 09-23-2009, 03:19 PM
scsmith scsmith is offline
Join Date: Jan 2008
Location: Ashland, OR
Posts: 3,015
Default details....

Interesting, Paul. They're just trying to keep us on our toes.

But the left and right sensors do use the same gasket. So, those clever guys figured that you could flip the gasket over and create a different pattern.
Steve Smith
Aeronautical Engineer
RV-8 N825RV
IO-360 A1A
WW 200RV
"The Magic Carpet" Flying since Sept. 2009
Hobbs 700
1/4 share in 1959 C-182B (tow plane)
LS6-15/18W sailplane SOLD
bought my old LS6-A back!!
VAF donation Dec 2021
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