Have you ever had an Ultralight/Kitplane Gear Drive Fail?

Discussion in 'General Experimental Aviation Questions' started by Armilite, Aug 21, 2015.

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Have you ever had an Ultralight/Kitplane Gear Drive Fail?

Poll closed Oct 5, 2015.
  1. Rotax A

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  2. Rotax B

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  3. Rotax C

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  4. Rotax E

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  5. SPG

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  6. Hirth

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  7. Compact Radial Engines

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  8. Rotax A

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  9. Rotax B

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  10. Rotax C

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  11. Rotax E

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  12. SPG

    0 vote(s)
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  13. Hirth

    0 vote(s)
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  14. Compact Radial Engines

    0 vote(s)
    0.0%
Multiple votes are allowed.
  1. Aug 21, 2015 #1

    Armilite

    Armilite

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    Have you ever had an Ultralight/Kitplane Gear Drive Fail?

    What happened?
     
  2. Aug 22, 2015 #2

    Dana

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    Yes, 3 times, but none of the above, they were all PPG belt drives.

    Dana
     
    SVSUSteve likes this.
  3. Aug 22, 2015 #3

    bmcj

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    Haven't flown much behind a gear, but I have blown out the belts on a multi-belt drive.
     
  4. Aug 22, 2015 #4

    stevel

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    Nope! I have seen several belt-drive failures, but never a gear-drive.
     
  5. Aug 22, 2015 #5

    Joe Fisher

    Joe Fisher

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    The Sunburst Had a Cuyuna 430 engine and a planetary gear reduction. The end of the engine crank shaft snapped off.
     
  6. Aug 24, 2015 #6

    stevel

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    We had a Cuyuna from our field fail at a neighboring field recently. He called it a crank failure too, but I don't know what part of the crank. Anyway, that's not a gear-drive failure. I concede that there is the possibility that the drive contributed t these failures, but they are still engine failures, not gear-drive failures.
     
  7. Aug 25, 2015 #7

    Guyo

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    No time with gears but several belt failures.
     
  8. Aug 25, 2015 #8

    Armilite

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    If you had only a Belt Drive Failure, what Failed if you know, Belt(What Type of Belt), Bearing, Backing Plate, Pulley, and list the Brand Name if known. I'm sure many People would like to know WHY it failed, WHAT Brand Failed, What Rpms it failed, on What Engine it failed on, HP used.
     
  9. Aug 25, 2015 #9

    bmcj

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    Mine broke one belt in a multi-belt system. The broken belt jammed in the system and took out the rest of them. That was 30+ years ago, so I don't remember what brand.
     
  10. Aug 25, 2015 #10

    Dana

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    I should point out that none of the three belt drive failures I've had were the belt itself. Once the aluminum prop shaft fractured, once the eccentric for adjusting belt tension came loose, once the mounting bolts broke. Poor design, in every case. Belts rarely fail without warning if pay attention to them during preflight.

    Dana
     
  11. Aug 26, 2015 #11

    Armilite

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    So far 0% failures for gear Drives.

    That's nice to know it wasn't account of the Belt/Belts. Each Type of Belt Drive, Belt has a Service Life. Like all things, People push them limits. I have heard of some older Hegar Belt Drives that failed for some of these same reasons, Bolts, Backing Plate Cracking, Pulleys, Bearing, etc.

    The only Gear Box failure I have read about was an A/B box with some rare 3.0 Gears. Most common Gear Ratio's was 2.0, 2.25, 2.58 ratio's for the A/B.
     

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