I just made an inquiry to DA on this engine the other day... its right up there in the same class as the OS GF40... although I believe the GF40 produces more HP, but more towards the upper RPM limit... although no numbers were discussed, I suspect this F-50 produces a bit less HP than the GF40, but produces more torque, but not by much.

I like the design, its got a steel liner, and bronze valve guides / seats... if you look at the cut-away images closely, the valve seat inserts are completely catapulted by the rocker base.

The GF40 has a liner-less cylinder, chrome plated aluminum... and chrome plated / aluminum valve seats which are part of the head casting... nothing wrong with that design either... OS has a good reputation for producing very nicely designed and reliable engines... I have one for my super cub.


This F-50, if they can bring the price into a competitive range, will prove to be a good contender in this class of engine... and just because its made in Taiwan, doesn't mean anything in today's world... you can get crappy quality made stuff here in the states, it all depends the individual companies ethics... based on the design of this F-50, Gaui's got some talented people working for them, and who knows where the design initial came from, as the US and other Countries have a large interest in Gaui.

Although its a bit rich for my blood, time will tell whether it catches on and becomes a popular choice in the 4 Stoke market, but I suspect, we'll be seeing other full CNC designs popping up with a bit more competitive pricing.


John M,