I can JUST recall flying Jack Miller's J1N 'HHU' out of Wellcross, (Sussex, UK) and seem to recall the power on stall speed as 14 MPH???
Decades later air testing one with company engineer aboard doing the VMO run, and I KNEW there was something wrong from the angle and the noise but he was INSISTENT I kept going to get it done. I quit! We found a largish leak in the Pitot line................ Only the Lord knows what IAS we got to!
Great machines. Hated those heel brakes!