Yes, that was interesting… but it did not clarify well where the yawing couple comes from.

It was explained with the drag differential. Well, the inside wing might have higher coefficient of drag because of higher angle of attack – but then again, it surely has much slower or indeed negative airspeed….

The inside wing is more stalled than the outside wing… so the outside wing actually produces a bit more lift… partly due to the faster rotation than the inside wing… that extra lift creates a roll moment that is translated into yaw… the spin becomes stablized when the aerodynamic forces and the mass moment forces come into equilibrium… that is the developed spin.

On some aircraft the yaw force must be maintained to remain in a stable spin. Bottom line is that the yaw due to roll and roll due to yaw are coupled with mass dynamics (e.g. the engines, location of fuel, other mass points).

There are other topics that can illustrate some of these concepts… check out my website… the links page has some video of normal and accelerated spins… it is a work in progress.

So was this done at civilian US flying training schools? Were these air cadets kept as civvies so as not to breach the neutrality rules? It’s really quite interesting as this was published on the 3rd of September 1941, so would have been taken some days or weks before then, before the USA was at war and whilst many of the US citizens were convinced that Canada training airmen for the RAF was bad enough. Did they realise it was happening in their own country too?

Does anyone know details? Where did they train? How many Brits went through such courses? Were other nationalities (Kiwis, Aussies, etc) also sent to the USA to train before the USA entered the war?

I don’t know all the details… it was called the Arnold Scheme… and the US trained something like 3000 pilots… mostly on the East Coast… and most of that was in Florida. I knew quite a few of these guys when I was stationed in England over 10 years ago…. try googling the ‘Arnold Scheme’.

What was the Highest Scoring American Fighter Squadron (i.e. not Group) of WWII? :rolleyes:

The 431st Fighter Squadron (P-38) scored 221 Kills in the PTO and
the 61st Fighter Squadron (P-47) scored 230 kills in the ETO.