Copyright of RotorSport UK Ltd
Document number RSUK0288
Page 25 of 55
After any blade adjustment, ensure all blades have the same angle to within 0.5deg –
recheck after tightening the hub. Max ground rpm should be circa 5,400, but do not adjust
the propeller blade angle to achieve this value - flight test to ensure the engine does not
rev higher than the Rotax maximum, and, if then required, adjust to suit. Note that the
prop is pitched to not exceed 5,800 in level flight at 100mph. If adjustment over 1degree
is needed, check engine performance! Note that the 914UL engine carries a datalogger,
available for interrogation of engine parameters by service engineers (with appropriate
equipment).
ALWAYS recheck all the hub bolt torques after first flight after adjustment, and if fitting a
new prop or blades, check the bolt torques after the first 25hrs, to compensate for the
blades settling into the hub. Failure to do so may lead to cracking of the gelcoat around
the blade to hub attachment.
Blade tracking is recommended as no more than 12mm deviation blade to blade,
measured at the blade tip, and is reset by slackening the hub bolts and pushing the
affected blade forwards or backwards, retightening and rechecking.
Special setup instructions
An RSUK gauge is available to aid blade setting.
Repair methods
Page issue 2, dated 11.03.13
