Joe,

Thanks for writing.....

Jett does provide some of the best power-to-weight engines you will find anywhere.

I cant specifically help on the thrust numbers. Static thrust means very little in the engine business. About the same can be said for HP numbers - they are usually meaningless since they are rarely measured the same way.

Can you tell me more about the aircraft it will be installed on and what you are looking for for performance (speed, heavy lift, hover/3D stuff/scale ??) That will be very helpful

Some basic information, since you noted the 13x4 prop. Perhaps this will be useful for comparisons.

The Jett SJ-60L is a ".40" size engine - same size and appx weight of an OS .46. This turns an 11x6, 12.25x3.75 or 12x4 APC around 14,700 - 15,000 with the stock jett-stream muffler. Turns a 12x5 or 13x4 prop just short of 14,000 (those are big blades). Configured as a FIRE (rear exhaust) the engine can create some major torque, and will turn up to 13x6 props around 12,000.

The Jett BSE-76L is a ".40" size engine - same size and appx weight of an OS .46. This turns a 14x4W or 14x6 around 10,500 with the Lite-Jett untuned muffler. Due to the nature of the engine, we typically like to keep its max RPM below 13,000, and max static rpm below 12,500 rpm. Configured as a RE engine and a long pipe, this engine can turn more prop while maintaining 10,000 rpm at peak.

Moving up to the "60" size engines, the real moster powerhouse is the BSE-120L. Same size as our SJ-90L and the OS 61/91FX. This will turn a 16x8 up around 9500 rpm or a 15x8 around 11K rpm. Again, this engine should be set up to run between 9000 and 12,000 rpm for best performance, however pushing it to 13K is possible.

If you want killer rpm and power in a '60' size engine, the BSE-90L engine combined with the stock jett-stream tuned muffler will turn an APC 13x4 probably around 15,000 rpm - however I do not believe the APC props of that size are rated for that type of RPM. The 90L typically turns a 12x6 prop up to 14,500 rpm peak, and gets a 12x8 or 13x6 up over 13,000.

Again, let me know a bit more about your application and I can guide you a bit more clearly.

Bob