The TPE 33-10 X inlet down version is widely available and has no significant operational differences from its sister engine, the inlet up. The largest propeller available is the four bladed Hartzell @ 109.5 inches in diameter.

The TPE 331-10 UX inlet up version is widely available and has no significant operational differences from its sibling engine, the inlet down.  There are two styles of torque sensors available on the inlet up engine (hydraulic and strain gage) The largest propeller available is the four bladed Hartzell @ 109.5 inches in diameter. 

The TPE 331-11 UX is an inlet up version. This engine is near identical to the -10s above.  The difference is a stronger gear reduction system and prop shaft.  This allows the use of the larger Hartzell 5 bladed propeller @ 118.7 inches. With  the use of water injection this engine is rated at 1100 SHP for 5 minutes.  With out water injection this engine is rated at 1000 SHP continuous and maximum.