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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 developed a perplexing issue where one landing gear oleo appeared to collapse after landing and during turns, but would slowly re-extend while taxiing.
  • Initial troubleshooting, including dismantling the strut and consulting experts, failed to solve the "sagging" problem until an online forum revealed the true cause: the *opposite* strut was sticking in an extended position.
  • The root cause was attributed to the recent use of Fowler flaps, which reduced touchdown speed and increased residual lift, preventing the aircraft's weight from settling properly on the inherently heavily damped oleo struts.
  • The experience highlighted the importance of accurate problem description and led to an expert confirming the strut design (derived from Piper Arrow gear) is overly damped, with a surprising recommendation to "land harder."
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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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