Well, I can confirm that Dave's method works as well...
I tried Lamber's but always ended up inverted, so my timing must be wrong.
Flew 5 batteries, doing almost only upright and inverted spin (or screwed up upright that ended up in inverted spins).
The best comment from a bystander: " That's a great airplane, as soon as you loose signal, it spin down by itself
He was thinking it was a feature that would save the plane if you let go the control and it would slowly come down spinning! I quickly showed him what happen if you don't touch the control... It's amazing how fast the Stryker go down in a staight dive!