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Troubleshooting the Beaver family of ultralight aircraft - Suspension System
UltralightNews.com
Lorem Ipsum is simply dummy text of the printing and typesetting industry. Lorem Ipsum has been the industry's standard dummy text
ever since the 1500s, when an unknown printer took a galley of type and scrambled it to make
a type specimen book. It has survived not only five centuries, but also the leap into electronic typesetting, remaining essentially
unchanged.
Beaver, Beaver ultralight aircraft, Beaver RX 35 ultralight
aircraft, Beaver RX 550 ultralight trainer troubleshooting report.
Other solutions that have been reported to work are the use of shorter three blade propellers, especially props like the IVO prop
which are much lighter. Rotax has recently updated their drives so that the smaller holes are no longer threaded. This means that
the bolts now require a nut and washer to secure the prop to the flange, which helps eliminate over torquing of the bolts and the
stripping of the threads in the output shaft flange. This update can be done on older drives by carefully drilling out the holes and
replacing the bolts, with a bolt, nut and washer.
Beaver Ultralight Aircraft Suspension System
The Beaver airframe, uses aluminum tube, bolt together construction. While this type of construction makes for quick and easy
building times, it has also shown itself to be a system that will show its age quickly if abused, or neglected. The type of suspension
used on the Beaver uses a shock absorber system.
Owners have reported failure of the shock absorbers after a hard landing, or on cross wind landing. This is an area that should be
inspected closely before each flight.
Another area of reported failure is the axle assembly. It has been reported to fail where the bolts for the mounting plates for the
shocks are located.. These axle arms have also been reported to crack and break where they are crushed at the top.
The nose wheel support tubes
Failure of the nose wheel support tubes have been reported. The proper solution requires the replacement of worn or damaged
support tubes with new.
Main wheels:
Owners have reported loosing wheels on landing of their craft. This is apparently due to the wear on the roll pin used to retain
the wheel on the axle shaft. In some cases this is due to the incorrect installation of the wheel. There should be a large flat
washer between the wheel and the roll pin. This helps prevent excessive wear on the pin.
Beaver Ultralight Aircraft Airframe:
The horizontal stabilizer jury struts. Wear has been reported at the end of the horizontal stabilizer support tube where it
connects to the main boom. This wear is caused by vibration. If wear is apparent the rivets should be removed the bracket and
boom inspected any damaged parts repaired or replaced.
Root tube:
In late 1989 several owners reported failure of the main root tube on Beaver aircraft. These failures apparently occurred aft of
the trailing edge spar bracket. Reports of "hairline fractures propagated around the square tubing at the cantilever point for the
engine." Beaver RX Enterprise recommended "immediate inspection of the root tube on all aircraft with inverted engine mounts.
Especially the area around the rear down tube pickups to the forward edge of the engine mounts." They update this area of the
craft by installing a 1/8" wall sleeve (a round inner sleeve) into the square root tube.
Another area of reported failure on the RX28/35/550 series of aircraft was the wing attachment brackets (#2986). These
apparently were originally aluminum brackets, and were updated to a steel bracket.
