OK, thanks, I thought the RPM are purely decorative.
PS: Apropos de Radar.

The SH3 files say the
FUMO 391 RADAR was put on top of the snorkel. Hystorical accuracy? Dunno?!!
Anyway, since these people figured out jet engines, rockets, and other nice gadgets, I find it hard to believe they never figured out how to put an extensible antena on the sail?! :rotfl: You may snorkel, but while you snorkel you're a sitting duck (whale) :hmm: Hard to believe...
So whatever goes on top of the snorkel, I'm happy with, as long as it gives me a bit of warning!!!!!!!!