Paco
minimum IMC speed, which in the Dauphin is 76 knots.
To be pedantic the min IMC speed is 40kts with other limits as table below:-
IMC flight
The approved IMC envelope is shown at Figure 1
At least one lane of each autopilot channel must be operative.
Minimum airspeed 40 knots (IAS Hold engaged)
Minimum airspeed VY (normal operation)
Maximum airspeed VNE.
The only a/c I have flown that you could climb vertically IMC ( if within HOGE ) is the Seaking which had a doppler meter giving groundspeed in any direction up to 40kts. I only every used it once to climb IMC and that was in the Cairngorms (Scotland) where I had to do an IMC climb from amongst the mountains on a SAR callout. The idea was to fly at min IMC speed commensurate with keeping the doppler meter as near zero as possible, accelerating once past MSA.
I am sure that anybody who tried to hover IMC with no doppler meter would soon meet their maker!
HF