Rotax RM 1 Benutzerhandbuch Seite 126

The acceleration potential between 9.200 and 12.200 r.p.m. is essentially higher than between
12.200 and 13.600 r.p.m. There it does not always make sense to use this r.p.m. range (high top
speed on a straight) and to leave the acceleration potential of the lower r.p.m. range (out of sharp
corners) unused.
This should only be a hint. The optimum choice can only be found at exact knowledge of the race
track.
For an approach or optimization of the reduction gear ratio the Charts 2 and 3 should be helpful.
The optimization procedure for the reduction gear ratio for a new race track is explained step by
step by the following example:
Start with the standard gear ratio (35 : 62, equivalent to 12 / 90 at 1
gear).
Now you must decide on the following criteria whether a shorter or longer gear ratio is necessary:
Does the engine reach 12.500 r.p.m in 2
IF YES:
Chose the next longer gear ratio (36 : 61 equivalent to 12 / 87 in 1
nd
in 2 gear).
IF NO:
Chose the next shorter gear ratio (34 : 63 equivalent to 11 / 87 in 1
83 in 2
If this gear ratio still should not be sufficient, try the next shorter or next longer gear ratio.
Note: When using short gear ratios it may happen that the response behaviour of the
engine in 1
lap time often a longer gear ratio is helpful to achieve a reasonable performance
behaviour.
Note: As hint and to facilitate the choice of the adequate gear ratio you find below two
Charts in which also the traditional gear ratios and the top speeds in [kmh] are
indicated that can be reached in the respective gear at an engine speed of 12.500
r.p.m.
Seite/page 126/132
Operator`s Manual RM1
the longest straight?
nd
gear).
st
gear is aggressive and the vehicle handling gets difficult. For a good
ROTAX KART RM1
st
gear and 14/79 at 2
nd
gear at the end of
st
gear and 14 / 76
st
gear and 14 /
Ausgabe/Edition 05/2003
nd