mw system

[jchenry]

is the mw system on the fw d-9 dora and the m-e109 k-4 the same

[razo+r]

Basically yes. Both use MW-50 from an auxiliary tank to boost the engine power output.

[grafspee]

But engage method is different.

In K-4 you have extra forward movement on throttle probably you would need noticeable more force to enter this throttle position. In K-4 engine will go to MW50 power settings regardless MW-50 switch position, and this is very dangerous. Max throttle is 1.45ATA and 2600rpm when you push throttle pass stop gate engine will run up to 1.8 and 2800rpm which can be used only with MW50 at high alt you can use 1.8/2800 without MW50 but i can't remember exact alt.

In D-9 when you engage mw50 it will bypass engine boost regulator and it will add more boost, boost gain will differ on which supercharger gear you are and your alt. In D-9 you don't get increased engine rpm, and if your mw50 switch is off you can operate throttle with full range, because increased ATA is only obtainable via mw50 switch.