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10-29-2016, 08:16 PM
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Join Date: Mar 2014
Location: San Marcos, CA
Posts: 265
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How much Proseal
I need to install 2 locking gas cap sleeves in the wings.
http://www.aircraftspruce.com/catalo...ickkey=3019014
Can anyone tell me if 1oz of Proseal will be enough, or should I get 3.5 ounces?
__________________
~Chuck
DG-800S Sailplane
QB RV-8 -- Working on the canopy and wiring
84CX Reserved
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10-29-2016, 11:38 PM
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Join Date: Nov 2012
Location: Launceston, Tasmania, Australia
Posts: 550
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For most flanges in the tanks, the rule of thumb equation is one gram of proseal for every linear inch of flange interface. Measure the circumference of your tank flanges and round up from there. The tank flanges are probably a little wider than the normal 5/8" rib flange, so you may need to add a margin accordingly.
Good luck.
Tom.
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10-30-2016, 05:11 AM
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Join Date: Dec 2013
Location: Santa Clara, CA
Posts: 180
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__________________
Rodrigo Damazio Bovendorp
San Jose, CA
RV-10 builder #41623
Build log at http://www.airplane.build/
VAF dues paid
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10-30-2016, 05:19 AM
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Join Date: Dec 2013
Location: Santa Clara, CA
Posts: 180
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(a detail to keep in mind is that you only care to apply sealant to the top part of the new cap flange, which will attach (through the sealant) to the already-installed flange, and that old flange is not very deep)
__________________
Rodrigo Damazio Bovendorp
San Jose, CA
RV-10 builder #41623
Build log at http://www.airplane.build/
VAF dues paid
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10-30-2016, 07:42 AM
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Join Date: Dec 2007
Location: Dogwood Airpark (VA42)
Posts: 1,323
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Rodrigo,
Recommend you put a ground wire (ring terminal) under one of your fuel sender screws and then proseal on top of that.
Considering all the proseal, the fuel sender may or may not have a good ground. Simple to do now and avoids problems later.
Carl
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10-31-2016, 03:20 AM
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Join Date: Dec 2013
Location: Santa Clara, CA
Posts: 180
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Quote:
Originally Posted by Carl Froehlich
Rodrigo,
Recommend you put a ground wire (ring terminal) under one of your fuel sender screws and then proseal on top of that.
Considering all the proseal, the fuel sender may or may not have a good ground. Simple to do now and avoids problems later.
Carl
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Thanks for the suggestion. I did test the conductivity between the surface of the sender plate and the skin, and it's conducting well on both tanks (I also measured the resistance from the skin to the sender terminal and it's giving me 235 ohms at one of the extreme positions, which is expected) - do you see any reason to add the ring terminal anyway?
When I installed the senders, I applied sealant on the inside of the sender plates (including some on the inside of the holes, but not the outside surface where the screws would sit), then fastened the screws, and only then applied sealant on top/around them to ensure they wouldn't leak, so there's good contact between the screws and the sender. I'm thinking that any resistance offset from the ground path through the screws and structure will be corrected by the calibration process.
__________________
Rodrigo Damazio Bovendorp
San Jose, CA
RV-10 builder #41623
Build log at http://www.airplane.build/
VAF dues paid
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10-31-2016, 05:24 AM
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Join Date: Dec 2007
Location: Dogwood Airpark (VA42)
Posts: 1,323
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Quote:
Originally Posted by rdamazio
Thanks for the suggestion. I did test the conductivity between the surface of the sender plate and the skin, and it's conducting well on both tanks (I also measured the resistance from the skin to the sender terminal and it's giving me 235 ohms at one of the extreme positions, which is expected) - do you see any reason to add the ring terminal anyway?
When I installed the senders, I applied sealant on the inside of the sender plates (including some on the inside of the holes, but not the outside surface where the screws would sit), then fastened the screws, and only then applied sealant on top/around them to ensure they wouldn't leak, so there's good contact between the screws and the sender. I'm thinking that any resistance offset from the ground path through the screws and structure will be corrected by the calibration process.
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Looks like what you did worked. Remember to recheck once the wings are on to make sure the ground is good all the way to whatever you are using for your common panel ground.
I find it easy to just avoid the issue and add a ground wire.
Carl
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11-04-2016, 03:45 PM
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Join Date: Dec 2013
Location: Santa Clara, CA
Posts: 180
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Quote:
Originally Posted by Carl Froehlich
Looks like what you did worked. Remember to recheck once the wings are on to make sure the ground is good all the way to whatever you are using for your common panel ground.
I find it easy to just avoid the issue and add a ground wire.
Carl
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Thanks, will do.
__________________
Rodrigo Damazio Bovendorp
San Jose, CA
RV-10 builder #41623
Build log at http://www.airplane.build/
VAF dues paid
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