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

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

  • Rotax A

    Votes: 0 0.0%
  • Rotax B

    Votes: 0 0.0%
  • Rotax C

    Votes: 0 0.0%
  • Rotax E

    Votes: 0 0.0%
  • SPG

    Votes: 0 0.0%
  • Hirth

    Votes: 0 0.0%
  • Compact Radial Engines

    Votes: 0 0.0%
  • Rotax A

    Votes: 0 0.0%
  • Rotax B

    Votes: 0 0.0%
  • Rotax C

    Votes: 0 0.0%
  • Rotax E

    Votes: 0 0.0%
  • SPG

    Votes: 0 0.0%
  • Hirth

    Votes: 0 0.0%
  • Compact Radial Engines

    Votes: 0 0.0%

  • Total voters
    0
  • Poll closed .

stevel

Well-Known Member
Joined
Feb 2, 2012
Messages
116
Location
Camarillo, California
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.
 

Armilite

Well-Known Member
Joined
Sep 5, 2011
Messages
3,360
Location
AMES, IA USA
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.
 

bmcj

Well-Known Member
HBA Supporter
Joined
Apr 10, 2007
Messages
13,519
Location
Fresno, California
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.
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.
 

Dana

Super Moderator
Staff member
Joined
Apr 3, 2007
Messages
9,376
Location
CT, USA
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
 

Armilite

Well-Known Member
Joined
Sep 5, 2011
Messages
3,360
Location
AMES, IA USA
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
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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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