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The Throttle Jockey RevMax is an RPM limiter. It allows
the pilot to maximize the power from the engine whilst
preventing overspeeding.
RevMax allows normal throttle signals from the receiver
to pass directly to the throttle servo under most
conditions. This is done anytime that the engine rpm is the
same as or lower than the target rpm. When an overspeed
condition is detected, RevMax enters a governor mode and
controls the throttle servo. The target RPM is set by an
auxiliary channel. RevMax does not require a super servo.
Why does it matter?
The Rev-Max is a new concept . This unit differs from the
usual engine governor and may be coined an "RPM limiter", or
as industry often terms an "Over-speed Governor"
The Rev-Max does not govern an under-speed condition relying
solely on the throttle curve for this function. The problem
with all governors is a slight throttle lag. This issue has
been completely addressed with this product.
The Rev-Max deals with less than half the workload during
engine rpm management thus allowing for a better and direct
connection between the engine and rotor. When the limiter is
not needed it is completely by-passed. As an example, during
rapid tic-tocs this unit will supply more useable power to
the rotor at the ideal time resulting in a faster, stronger
and more impressive maneuver. The throttle simply stays in
sync with the rapidly changing rotor loading. Fast multiple
rolls benefit in a similar manner as do others.
Tuning the throttle curve is fairly straight forward after
selecting a target rpm on the ground using the lower point
on the current curve. This verifies that the unit is
clipping at the desired rpm. Once this is completed the rest
of the idle-up points are set in flight to maintain or
slightly exceed the target rpm. The engine note will give
ample under-speed clues since confusing over-speeding is
non-existent. Cyclic to throttle mixing will now co-exist
with the Rev-Max and can be set in flight to remove any
under-speeding during hard over cyclic maneuvers. A direct
and very connected feel is maintained with no over revving
of the engine or rotor.
The Rev-Max will not easily mask a poor mixture setting as a
governor might, and will encourage smoother and more
available engine power. With the smaller 30 and 50 sized
governed machines the extra useable power is most welcome.
Competition pilots have always wanted a direct link between
the throttle and rotor but had to put up with annoying over
speeding. This is because different maneuvers load the rotor
differently at similar collective settings. Many flying the
bigger helicopters presently employ a governor to this end
as the lesser of two evils, while hard-core stubborn
perfectionists refuse to have any part of a governor. Today
we have the cure for both.
"The Rev Max limiter works better then any governor on the
market today, superior midrange power is achieved resulting
in a more positive feeling model. This is the only rpm
limiter on the market that I know of, it's very good idea
which allows one to get even more performance out of their
helicopter."
Stephen and Colin Bell CANADA
Review: Michael Prewitt
www.raptortechnique.com
RCHeli Review :
www.rchelimag.com
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