BMA Viscount Spool-up Behaviour

[ABUKABOY]

Viscount engine note..............

As an ex 815-er, and to put it simplistically, on any Dart if the power is introduced slowly and gently, when the prop starts to govern, it will drag down the engine rpm, as there is not a whole lot of power applied to overcome the effects of the first coarsening. A good fist of power at this point will result in a steady rpm as the prop absorbs the applied power. (If the power stays low, more hunting of rpm will result). A steady determined application of power in the first place will result in one slight decrease as the prop "catches", and a steady note thereafter.

Think of your car. As you let in the clutch, the rpm dies away as it is engaged, then accelerates with the car. If you increase the power as the clutch is engaged, you can prevent the rpm from dying down.

Hope that helps.