Spectrum RX550 Beaver ultralight aircraft troubleshooting report.

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.

Troubleshooting the Spectrum Beaver RX550, RX35, and RX 28 family of ultralight aircraft by Spectrum Aircraft.

Beaver RX 35 Powered by Rotax 377, Rotax 447 or Rotax 503 twin cylinder aircraft engines.

UltralightNews.com

A problem reported with the use of the above engines on the Beaver has been crankshaft failures. Personal experience indicates that contributing factors to these failures may be: 1: The use of Rotax engines in a inverted installation. When the Rotax 337/447/503 are used in an upright installation a gravity feed system is used to supply oil to the crankshaft main bearings through channels in the crankcase. While oil is still supplied to these bearings in an inverted application, it is being supplied by internal engine pressure, rather than gravity. When an upright engine, is left in storage oil flows down into the channels in the case coating the crankshaft bearings.

In an inverted installation this oil flows AWAY from the bearings. This lack of oil on start up can lead to premature bearing failure. Before starting an engine that has been left in storage it is recommended that the engine be turned over for several revolutions, with the ignition turned off to bring oil back up into these bearings. 2: The use of long two blade or three blade propellers with too much pitch. This prevents the engine from developing full RPM which causes the crankshaft to be under load all the time. Proper RPM for a 277 engine Proper RPM for a 377/447 Rotax engine Proper RPM for single carb 503 engine Proper RPM for a dual carb 503 engine To much pitch will result in to low an RPM

Beaver, Beaver ultralight aircraft, Beaver RX 35 ultralight

aircraft, Beaver RX 550 ultralight trainer troubleshooting report.

Spectrum Beaver RX 35 ultralight aircraft powered by Rotax 377/447

Rotax 377/447/503 twin cylinder ultralight aircraft engine used on Beaver RX35 and RX 550

full power full power full power full power

straight and level flight should be 6350 RPM straight and level flight should be 6600 RPM. straight and level flight should be 6350 RPM. straight and level flight should be 6500 RPM. To little pitch will result in too high an RPM

Rotax 277 single cylinder ultralight aircraft engine used on Beaver RX28