Vmca
On the B.15 - and your Dad will remember this - the Wing Clear switch just forward of the throttles (and nicely within middle finger rapid-jabbing distance) did just what was wanted -everything fell off the wing (not the engines, for you purists) and Vmca came straight back to IIRC 125 kts, just like the B.2/B.4. Made life a lot more comfortable, but of course the H&S Authorities might still get a touch of the trembles these cautious days.
Anyway - Many Happies to your paternal relative.
JP