bjornhall As it was me who posted:
2) let's take a warrior - Vs (clean) 50 kts, Best climb 79, Best glide 73: 60 degree bank, 2g, Vs goes up by 1.4 multiplier - i.e. 70kts. Uncomfortably close, but not actually above the glide speed.
Good point regarding the CAS - I learned something.
CAS or IAS, I'd allow some extra knots in the turn. No one in their right mind would fly 60degrees at best glide - flying bare knots from the stall is hideously inefficient - best glide is calculated for a 1g loading, once you depart from wings level the speed changes (upwards) anyway. Merely pointing out it's not quite as unfeasible as some people seem to think.
So I stand by my point - irrespective of whether the turnback is a good idea or not (I firmly believe not except in rare circumstances), turning at low speed does not automatically end in a spin, nor does a high angle of bank end in a spin. I'm railing against the "if you exceed 30deg of bank you'll spin and die" brigade more than anything.
However, to add fuel to the fire - 2 recent departures, same aircraft, same runway.
1) MTOW/43deg/nill wind - ROC pitiful. Book said yes, but them trees seemed awful close - and my ROC was a lot less than a gliding ROD.
2) 1POB/10deg/10kts - nearly 1000fpm, crossed the upwind boundary at somewhere close to 600agl.
2 very very different propositions had there been a hiccup.