thanks for the reply Faldrax.
I dug out the cd that came with the gun and it says to use shutter priority and use what ever speed I like.
Also, if I use the TTL section on my gun, I can set HSS and use any shutter speed I like.
As I aim to `try` and stop the movement of the wings, I shall give it a go at 1/8000.
I can also use full manual and let the gun adjust the light output for correct exposure.
will post the results here if I get any thing worth while