Hi to all of you

let me introduce myself. I'm a newbie from France. I'm just fascinated by gyros and try now to make one myself.
Some of you may find it stupid, but i'm not keen on ready-to-fly kits, although suited for beginners. I prefer the thrills of making my own mistakes.
I hope, i can convert my flying skills as a plane pilot into rc piloting.
I have been in touch with Mike Smith from aerobalsa for months, and I wonder how fast will a 70" rotor spin (SG6042)?
Can anybody answer this question please?

thanks for your support

best regards