On my 4S info exchange, I get many requests from people regarding the applicability of the different brands and sizes of these excellent engines.

Regarding personal experience, here are some engines and names of individuals who have had extensive experience with them. I emphasize EXTENSIVE as their experience is not limited to a few flight but intensive development and experimentation. They are also people with whom I have had contact and/or who have contributed greatly to the info exchange.

SAITO .50 & .56 ------------Willis Swindell
SAITO .56 ------------------Brad Walker, Steve and Doug Moon, Bob Reeves
SAITO .72------------------Milton Graham & Dee Rice
SAITO .40A ----------------Bob Reeves & Dee Rice
OS Surpass .52-------------Bob Dixon
OS Surpass .40-------------Bob Zambelli & Phil Spillman
OS Surpass .26-------------Bob Zambelli
OS 20 4S-------------------Bob Zambelli
OS 40 4S-------------------Bob Zambelli
SAITO .30------------------Bob Zambelli, Bob Reeves & Willis Swindell
RCV .60 --------------------Bob Zambelli   

So, have I left anyone off?
Have I made any errors?
If so, let me know and I will, of course, amend the list to include them.   
I only ask that, should I include more people, that they join my list if not already on it.
They must also be willing to share any and all their 4S experience.

SAITO 80?
Surpass 70?
SAITO .62?
Surpass 48?
Magnum?
Others?

If you want to send me a private message, please do so at <rzambelli@moog.com>

Bob Z.