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Rx for Overactive Vents

Aftermarket bladder tanks on a Mooney protect
the vent with a streamlined ice catcher.

(Photo by Robert Takacs)
Gemini Sparkle

Key Takeaways:

  • The author's parked plane experienced a significant fuel leak from a wingtip vent, caused by uneven weight distribution and strut compression that tipped the aircraft.
  • Initially believing it was a unique flaw, the author learned from other pilots that this fuel-spillage issue is common in aircraft designs featuring narrow landing gear, outboard wing tanks, and small dihedral angles, where vents are easily overflowed.
  • To prevent recurrence, the author plans to modify his wingtip vents by extending them upwards through the wingtips, creating a higher outlet point.
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The day began benignly enough. I flew to Las Vegas in midmorning to pick up a couple of friends and bring them back to Los Angeles. The flight up was routine, cruising at 7,500 feet, 15-knot headwind, but smooth and clear with unlimited visibility.

We put in 20 gallons at North Las Vegas, where the price was a bit lower than at my home field of Whiteman (WHP). During the takeoff roll something went wrong: a change in the exhaust note, a drop in the manifold pressure. I aborted and taxied off the side of the runway.

Peter Garrison

Peter Garrison taught himself to use a slide rule and tin snips, built an airplane in his backyard, and flew it to Japan. He began contributing to FLYING in 1968, and he continues to share his columns, ""Technicalities"" and ""Aftermath,"" with FLYING readers.

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