Beastx MICROBEAST PLUS Manual page 255

Fast rampup speed (K)
When using a very fast rampup speed in consequence the throttle will be opened
very quick. Especially when recovering from an autorotation maneuver this can cause
the rotor blades to fold in or will damage the main gear. So only increase the value
stepwise and with care. With nitro helicopters using quite low values is recommended
(even the setting "same as slow rampup speed (J)" may be sufficient) as here an abrupt
throttle change from idle position can cause the engine to quit! Also nitro motors react
quite slow to throttle changes and it takes some time to speed up the rotor. When the
change rate does not fit to the physical speed up, it can happen that the motor is driven
to full throttle during spool up by accident as the motor does not come to speed. In
this case for technical reason it may happen that the systems stays at full throttle then!
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