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Ultralight Aircraft Reduction Drives.
UltralightNews.com
Ultralight Aircraft, buying a used ultralight aircraft,
how to buy a used NOT abused ultralight!
Belt Reduction drive systems:.
This was the second type of system used in ultralights. These drives used an upper and
lower pulley, of different diameters, and a single or series of belts, to reduce the prop
RPM. This allows the use larger propellers for better performance and reduced noise.
When buying a craft equipped with a belt drive system check out the
two pulleys for wear or damage, the condition of the belts, shaft
bearings wear . Also check the reduction drive casings for signs of
cracks or damage .
Early model Quicksilver MX aircraft used a coupler to connect the
driveshaft to the engine. This coupler failed and was updated to a
large diameter coupler ).
Many early designs used belt drive systems on the Rotax engines. On early model 277
engines over tightening the drive belt can result in failure of a plastic liner used to
support the crankshaft PTO end bearing.
Failure has also been reported on 377/447/503 crankshafts using belt drive systems. If
purchasing an aircraft with over 100 hours on it using a belt drive on a Rotax engine,
like an Quicksilver MX, Rotec Rally, a complete tear down and rebuild of the engine is
recommended!
Planetary Reduction Drive System Failures:
Several planetary systems were used over the years on ultralight aircraft. Most are no
longer available.
One widely used system was the Winters reduction drive. Failure of this system forced
the manufacturer to stop production. Failure has occurred at the output shaft,
resulting in the propeller exiting the aircraft.
Failure also occurs in the aluminum ring supporting gears inside the casing, usually
resulting in seizure of the drive system, resulting in a forced landing.
Recommendation: If the craft you are considering, has this re drive system; DO NOT FLY until you change the drive system.
Consult aircraft manufacturer or someone knowledgeable in the industry for advice.
