[QUOTE=Geriaviator;11552226]Interesting info. Sorry I can't remember the detail as I was only a youngster at RAF Binbrook in 1948-51 and worshipped my father's friend Bob Nash, RCAF, who had flown two Lancaster tours and patiently drilled me each Sunday in the fully equipped cockpit of the old Lancaster used for dinghy/crash practice. He remarked one day that they often used emergency power for takeoffs, such were the bomb-fuel loads. (The Lancaster startup/taxi/takeoff drill was quite a showstopper at our kids' parties and other parents gave my mother a sympathetic look, today I would probably be sent for counselling.)
Bob remarked one day that some of his countrymen had a belly gun in place of the H2S cupola, though he preferred the navaid. Of course I couldn't understand the significance of either. With hindsight we know the Luftwaffe had an H2S homing device within a few months of its introduction so Allied crews were advised to use it for a few seconds only.
Pleasure sir.
On H2S, Naxos wasn't that effective in tracking aircraft and after a captured Ju88 (in summer 44) crew told of its ineffectiveness, it continued to be used.
The biggest threat was from night fighters homing in on Monica, or 'boozer' as crews called it, with 'Flensburg'.
After this discovery , Monica was removed.