Ok, I'll say it again. Fiddle with -" SHP
PLUS RPM "
E Propultion =
DRAIN
D Propultion =
CHARGE
Battery Multiplyer =
RATE
Ok example - increase SHP, decrease RPM = Same consumption same speed, but different Drain/Charge properties or increase RPM, decrease SHP.
However, be aware that a FASTER D Propultion RPM with more SHP than an E Propultion RPM and SHP resualts in a faster speed at snorkel depth.
The Type XXI is REVERSE to all other Subs in that it has a Better E Propultion than its D Propultion.
Ohh PS : The Type XXI does NOT have a RADAR mounted ontop of its Snorkel, its ment to be the Radar Warning Reciever IIRC. A radar ontop of the snorkel at sea level is rather redundent as it would have a VERY limited range, BUT a reciver to pickup the aircraft radar is of course self explanertory !
However placing a Radar emmiter ontop would be nice for when ur surfaced to get a tad more range
