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12-29-2019, 06:09 PM
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Join Date: Jul 2017
Location: Omaha, NE
Posts: 42
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AOA Retrofit Kit O-ring
I don't think my Kit from Van's included the O-Ring that slides over the aluminum connector tube. It is said to have 1/4" ID, so that's a start for finding one locally. Anyone know the actual size of the one Van's includes?
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12-29-2019, 07:07 PM
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Join Date: Oct 2010
Location: Phoenix, AZ
Posts: 2,818
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You can get a box of various sizes pretty cheap at Harbor Freight.
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12-30-2019, 04:54 AM
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Join Date: Jul 2017
Location: Omaha, NE
Posts: 42
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Quote:
Originally Posted by RFSchaller
You can get a box of various sizes pretty cheap at Harbor Freight.
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Hmmm... I know that the ID is 1/4", but I do no know what the cross section is, nor the material, both of which I want to get right the first time. If I guess wrong, it involves pulling a wings and try a different one. |
12-30-2019, 05:22 PM
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Join Date: Jul 2017
Location: Omaha, NE
Posts: 42
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Found out from Van's, in case anyone else loses their little O-ring  
Bunan Nitrile Rubber 3/8 O.D. 1/4 I.D. That means 1/16 cross section width, or thickness. |
01-03-2020, 10:27 AM
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Join Date: Jul 2017
Location: Omaha, NE
Posts: 42
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OK, sorry for being so ignorant, but...
Has anyone discovered they have a leak during the leak-down test that requires a syringe and modeling clay and a second person to do?
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01-03-2020, 10:42 AM
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Join Date: Jul 2005
Location: Hubbard Oregon
Posts: 9,026
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Quote:
Originally Posted by Strappe
OK, sorry for being so ignorant, but...
Has anyone discovered they have a leak during the leak-down test that requires a syringe and modeling clay and a second person to do?
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Leak test can be done solo if you have a hose long enough to reach near the cockpit.
__________________
Opinions, information and comments are my own unless stated otherwise. They do not necessarily represent the direction/opinions of my employer.
Scott McDaniels
Van's Aircraft Engineering Prototype Shop Manager
Hubbard, Oregon
RV-6A (aka "Junkyard Special ")
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01-03-2020, 10:59 AM
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Join Date: Jan 2017
Location: White Salmon, WA
Posts: 173
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Quote:
Originally Posted by Strappe
OK, sorry for being so ignorant, but...
Has anyone discovered they have a leak during the leak-down test that requires a syringe and modeling clay and a second person to do?
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Yes. Just so you know though, I had a **** of a time making the syringe/modeling clay thing work without the setup itself leaking. I opted to using a football inflation needle inserted into the rivet hole, with a small O ring super glued to the needle base. Then I sealed the needle to the wing skin with a small amount of RTV (emphasis on ?small? ) and don?t get any in the rivet hole. I let it cure overnight then conducted the test.
The system leaked down too quickly so went leak checking, starting with the ADHARS box. The first thing I did was remove and reinsert the AoA tube at the box. Luckily that was the source of the leak. The difference was dramatic. It was rock solid after reseating the tube.
One last thing, the syringes I used had a tendency to ?spring back? when applying pressure. I had to carefully hold the plungers steady during the test.
Hope this helps.
__________________
Steve Morrow
RV-12 N12SM
Builder 121036
White Salmon, WA
2020 Donation Paid
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01-03-2020, 11:05 AM
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Join Date: Jul 2017
Location: Omaha, NE
Posts: 42
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Quote:
Originally Posted by Tacco
Yes. Just so you know though, I had a **** of a time making the syringe/modeling clay thing work without the setup itself leaking. I opted to using a football inflation needle inserted into the rivet hole, with a small O ring super glued to the needle base. Then I sealed the needle to the wing skin with a small amount of RTV (emphasis on ?small? ) and don?t get any in the rivet hole. I let it cure overnight then conducted the test.
The system leaked down too quickly so went leak checking, starting with the ADHARS box. The first thing I did was remove and reinsert the AoA tube at the box. Luckily that was the source of the leak. The difference was dramatic. It was rock solid after reseating the tube.
One last thing, the syringes I used had a tendency to ?spring back? when applying pressure. I had to carefully hold the plungers steady during the test.
Hope this helps.
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Yes, that helps a lot. Thank you! |
01-03-2020, 11:08 AM
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Join Date: Jul 2017
Location: Omaha, NE
Posts: 42
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Quote:
Originally Posted by rvbuilder2002
Leak test can be done solo if you have a hose long enough to reach near the cockpit.
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Longer tube I have on hand.
Thanks |
01-11-2020, 08:07 AM
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Join Date: Jul 2017
Location: Omaha, NE
Posts: 42
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One last question (I hope)
As shown in the image with labels, the depth of insertion after installing the wing with both pins engaged shows that the aluminum tube must be too long since the distance from the fuselage end of the tube to the O-ring is too far. As shown by another image, the length of the tube matches that prescribed by the template. The other image shows the depth of insertion when I shove the tube into the wing receiver. It is identical to the depth shown after wing installation. The instructions state that I should remove 1/32 ths of an inch from the length, but it looks to me like I need to remove a lot more than that.
Of note, the leak test is fine, and the wing is fully engaged by the pins in the fuselage.
So, I assume I need to remove enough of the length of the tube to match the gauge. That appears to be more like a 1/4" . Am I missing something?
Last edited by Strappe : 01-11-2020 at 10:50 AM.
Reason: embed images
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