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Sherlock and the Sagging Strut

** As it turns out, there was more than one way
to solve the mystery of Melmoth 2's sagging
main landing gear strut.**
Gemini Sparkle

Key Takeaways:

  • The author's homebuilt aircraft displayed a puzzling symptom post-landing: one landing gear strut appeared to collapse, causing the wing to slump, before slowly returning to normal.
  • The mystery was solved when external advice suggested the problem wasn't a collapsing strut, but rather the *other* strut remaining over-extended due to its heavy damping.
  • The underlying cause was a combination of using Fowler flaps (reducing touchdown speed and increasing residual lift) and braking, leading the aircraft's weight to settle too gradually for the struts to compress to their static height immediately.
  • The experience highlighted the importance of accurate problem definition, questioning subjective impressions, and leveraging online resources or expert opinions when troubleshooting.
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During the summe of 2010, my homebuilt, Melmoth 2, which had been flying for almost eight years, began to display a mystifying symptom. As I turned off the runway after landing, the main landing gear oleo on the outside of the turn would seem to collapse. The wing on that side would slump toward the ground, and because Melmoth’s wings have relatively little dihedral and are completely wet from root to tip, fuel would sometimes even dribble out of the tank vent at the wingtip. Once or twice the local controller at my home field told me that I had a flat tire, but after seeing me taxi off listing drunkenly to starboard a few times, he must have decided that nobody could have that many flat tires.

But here was the bizarre thing: As I continued to taxi, the strut would slowly return to its normal height.

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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