The position of the oil tank and whether the airplane is equipped with a nosewheel or tail wheel
figure into your knowing when the oil level is acceptable (tank shown at lower left).
When you’re building your own aircraft
and thinking about controls, consider that
the Rotax carburetors have built-in throttle
springs. (In the event of throttle cable
breakage, the throttle will go to full rpm, so
you won’t be left with idle power at a critical phase of flight. With full power
hard-wired, you at least have control with
the mag switch.) That means the carburetor will always be trying to pull the throttle
open. A vernier throttle (as you’d ordinarily
see handling mixture control on a
Lycoming or Continental) or other friction-type throttle system helps keep the throttle
from creeping open as you fly. Note that
some airframe manufacturers use these
throttle springs to pull to idle! Be sure you
know how your aircraft is set up and know
what to expect if a throttle cable breaks.
If you build your own aircraft, remem-
ber that the Rotax was designed as a
system. If you change intake or exhaust
systems, for instance, you should plan
extensive experimentation to get the carb
jetting and needle profiles just right. Don’t
know how to do this? Use the whole sys-
tem, as delivered.
Tim Kern, EAA 825075, is a private pilot and
Certified Aviation Manager as well as an
aviation writer and consultant based near
Indianapolis, Indiana. You can find him online
at www.TimKern.com. Special thanks to
Mark Paskevich of Rotech Flight Safety Inc.
REGISTER AT ROTAX-OWNER.COM
To better understand the unique requirements of your Rotax, explore the resources at www.Rotax-Owner.com (Registration, e-mail updates, and product reviews are free.) That site hosts a complete
video library of both e-learning and expanded video instructions that explain proper maintenance,
available for an annual fee. This information is especially useful if your mechanic is not familiar with
Rotax engines. Rotax engines have unique requirements; by watching Rotax-Owner videos, owners,
operators, and maintenance personnel will be better informed to perform the right procedures and
appreciate additional training rather than working from assumptions that do not apply to your Rotax.
Lastly, register at www.Rotax-Owner.com to receive all critical safety and service information about
Rotax engines as released by the Rotax factory. This factory-authorized site is the best way to stay up
to date on the latest Rotax information and news. The more you know about your engine, the
happier you will be with it!
PHOTOGRAPHY BY JIM KOEPNICK
Visit: www.SonexAircraft.com or call: 920.231.8297