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rehn(at)rockisland.com
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 Posted: Sat Sep 17, 2016 9:11 am Post subject: Fuel vent |
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A few days ago approaching an airport about 10 miles out 2,000 agl, 135 knots, a sudden high pitched whine started and got my immediate attention, to say the least! Slowed down, at 107 knots noise went away. noise came from rear, not engine, every thing normal up front, seemed speed associated. Spent next few days crawling all over looking for something the air could be causing. Test flew several times after a possible fix, no luck. discovered noise was most intense over fuel tank area! Finally decided to blow out fuel vent, discovered bug parts in vent, not so much to fully block but to create a not so nice musical screamer 107 knots plus.
So the little critter slammed into that tiny vent at 2,000 feet! What are the odds?
I did consider a bug had got into the vent on the ground and then got pushed further into vent, however I keep the vents covered on the ground so think that was unlikely.
All is well now but wanted to share, thought this was a strange one.
I did learn during this process that your iPhone does a great job looking in areas one just can’t see, pics with the flash. I have many photos of areas that would be very difficult to see even with mirrors.
Glad this one is over!
Jerry
Mono XS
914
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Remi Guerner
Joined: 14 Dec 2010
Posts: 284
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| Posted: Sat Sep 17, 2016 11:57 pm Post subject: Re: Fuel vent |
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Jerry,
That is interesting. Thanks for sharing.
I have always considered a fuel vent facing forward was not a safe enough solution, as water and dirt (even bugs!) may enter in flight, being pushed by the airflow. Therefore I have added a second vent which exits vertically at the bottom of the fuselage. The two vents are connected with a tee. Additionally, I have covered the top vent with a stainless steel screen.
The bottom vent is also convenient when filling the tank as it allows excess fuel to flow out before the cobra is filled to the top.
Remi
F-PGKL
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