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Fuel tank instructions, Tips, Hints

 
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n8vim(at)arrl.net
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PostPosted: Tue Jan 03, 2006 3:39 pm    Post subject: Fuel tank instructions, Tips, Hints Reply with quote


Anyone else notice that the fuel tank instructions must have been
written by someone other than who wrote the previous sections? They seem
to leave out important information, requiring some head-scratching at
the dinner table.
For example: What do you countersink on the tank attach bracket? What do
you dimple on the skin? Should you countersink the skin on the attach
bracket, or dimple it and countersink the bracket?
This is what I have so far (Add it to the tip list.. if I'm correct that is)
1. Countersink ALL #40 holes on the tank attach bracket.
2. Do not countersink ANY #19 holes on the tank attach bracket.
3. Do not dimple the skin at the location of the fuel sump/drain
flange (the flange is pre-countersunk)
4. Dimple the skin holes with a regular #40 dimple die
5. Dimple the stiffeners, ribs, and J-stiffener with a #40 tank
dimple die (allows room for proseal between the dimples)


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n8vim(at)arrl.net
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PostPosted: Wed Jan 04, 2006 12:18 pm    Post subject: Fuel tank instructions, Tips, Hints Reply with quote


Anyone else notice that the fuel tank instructions must have been
written by someone other than who wrote the previous sections? They seem
to leave out important information, requiring some head-scratching at
the dinner table.
For example: What do you countersink on the tank attach bracket? What do
you dimple on the skin? Should you countersink the skin on the attach
bracket, or dimple it and countersink the bracket?
This is what I have so far (Add it to the tip list.. if I'm correct that
is)
1. Countersink ALL #40 holes on the tank attach bracket.
2. Do not countersink ANY #19 holes on the tank attach bracket.
3. Do not dimple the skin at the location of the fuel sump/drain
flange (the flange is pre-countersunk)
4. Dimple the skin holes with a regular #40 dimple die
5. Dimple the stiffeners, ribs, and J-stiffener with a #40 tank
dimple die (allows room for proseal between the dimples)
Also, I have been advised to not Alodine the inside of the tank because
the Alodine will come off with constant exposure to avgas. This is from
someone who has built an RV-8 and has rebuilt a few production aircraft.
-Jim 40384 Tanks almost ready for the joy of proseal!


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ricksked(at)earthlink.net
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PostPosted: Wed Jan 04, 2006 2:35 pm    Post subject: Fuel tank instructions, Tips, Hints Reply with quote


James,
You'll find the plans will start to get more vague as you progress, Not bad but the plans get less handholding than in the earlier sections. One tip I have is to look ahead and see where things are intended to go then you get a clearer picture of why you doing something that seems not "normal". Be prepared to make countersink vs. dimple decisions, stuff like that.
Rick S.
40185
Fuselage


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