Buying a used ultralight aircraft - things to look for.
Buying a used ultralight aircraft - propellers
UltralightNews.com
The propeller is usually the most neglected part of the propulsion system. Yet it is what takes
the power and creates the thrust which result in the wings developing lift. An improper
propeller can cause the engine to over rev, resulting in overheating and engine failure. Under
rev resulting in poor climb, usually resulting in an accident.
It also is subject to a great deal of stress, from changes in engine RPM, aircraft attitude, and
vibration from the engine, and improper prop balance. It is also subject to environmental
damage from the sun, wind, rain, and ground.
Propeller failures have resulted in engines being completely separated from the aircraft, resulting in loss of control, causing
serious injury and death!
Check the prop for nicks or cracks
Check it for signs of environmental damage, rotting, paint pealing.
Check the inside of the hub area on older Warp Drive and IVO props for cracking .
Check bolts that hold it to the reduction drive for bending, rust, corrosion.
Check the prop spinner for cracks .
On aircraft using the Ultraprop, in a tractor configuration it is
recommended that the prop spinner not be used, or be securely wired on.
Check the prop for proper diameter and pitch, for reference use the prop
guide chart found in the CPS, and Leaf catalogues.
If the craft you are buying is going to be on floats make sure the prop has some kind of leading
edge protection. Without leading edge protection your prop will be a wall ornament after the
first take-off! Props range in price from $200 to well over $1,000.00
Warp Drive Propeller Failures.
Ultralight Aircraft, buying a used ultralight aircraft,
how to buy a used NOT abused ultralight!
Other areas to look at are; the cowls surrounding the engine, the fan tower, intake manifold(s)
recoil housing ignition wiring especially on Kawasaki, Cuyuna engines using CDI ignition, failure
of the wiring occurs where wires engine CDI box.
If engine is equipped with Rotax electric start look to see that spacer between magneto and
flywheel has been update from that shown on left to that on right. Check the magneto for
damage, caused by improper propeller balance, loose magneto nut, substandard motor engine
installation.
Also check to make sure wiring has not been pinched or burnt . A poor ground on electric start,
will result in severe damage to electrical system.
Look at the physical appearance of the engine! It should be clean! Any sign of leakage from
gaskets, or seals means the engine requires disassembly, replacement of parts and reassembly.
A leaking seal or gasket can result in, erratic engine performance, overheating, lack of
performance and or engine failure!
