I HAD A 72" 3 BLADE WHIRL WIND PROP BEHIND A BAD 503cid CAD IT WORKED REAL WELL AS FAR AS PUSH WENT YOU NEED TORK FOR A PADDLE PROP THAT IS DIRECT DRIVE I TURNED IT 2850 RPM AND MAN DID IT EVER PUSH I COULD FINALLY RUN DRY BEFORE I HAD A WOOD PADDLE PROP 72" 42 PICH AND I WOULD TURN IT 3200 RPM BUT THAT IS WAY TO MUCH RPM FOR ANY WOOD PROP AND IF YOUR RUNNING DRY I COULDN'T SAY IN THE GAS VERY LONG!!! AND AS FAR AS THE BLADES LOOSEING UP I NEVER HAD ONE PROBLEM WITH THAT IN HOLE TIME I HAD IT AND IT WAS OVER THREE YEARS IN FACT I HAD MY STEERING ARM BROKE AND I WAS RUNNING AROUND 40mph AND MY BOAT TURNED SIDE WAYS ON ME AND MY WAKE CAME IN SIDE THE BOAT AND I HEARD THE PROP HIT THE WATER AND I STOOD ON THE GAS AND IT PULLED THE BOAT STRIGHT OUT OF THE WATER AND DIDN'T EVEN DAMAGED THE PROP I WAS VERY IMPRESSED WITH IT THEN BUT THERE IS A PROP FOR EVERY MOTOR IF YOU ARE RUNNING DIRECT DRIVE WITH A CAR ENGINE WITH ALOT OF TORK I RECOMMEND A WIRL WIND FOR YOUR MONEY AND IF IT'S AN AIRCRAFT ENGINE A WARP DRIVE ANYTHING KIND OF PROP YOU CAN AJUST TO ANY PITCH YOU NEED WITH A WOOD PROP IS JUST A GUESS??? AND IF YOU DON'T LIKE IT YOU WILL HAVE TO BUY ANOTHER THERE IS NOTHING LIKE AN AJUSTABLE PROP!!!!!!!! I DON'T CARE WHAT BRAND IT IS AND THE WIRL WIND PEOPLE TREATED ME REAL WELL!!!!!!Prwlkat":cxpdw6nn said:Has anyone had any experience with a whirl Wind prop? How well does it perform for you?