| The Graupner Systems Cat is a semi scale version of the 1986 world offshore championship winner. The boat can be set up either for electric or nitro power. |  |
| I purchased this boat used. It was already set up with the standard electric set up consisting of a Graupner flex drive and speed 700 motor. This setup is designed for 12 cells using two 6 cell battery packs. Instead of the standard black, this boat was painted bright red. |  |
I changed the drive line after receiving the boat because I did not like the looks of the original equipment. It had a very short metal guide tube and a oversized teflon liner. The liner was oversized to fit around the flex cable which had a cap soldered onto the motor end. This cap prevented the use of a standard .130 teflon liner. I was able to remove the end cap by heating it with a torch. After the cap was removed, I build a new stuffing tube using brass tubing with a teflon liner. I extended the brass tubing all the way from the motor strut to about 1/4 of an inch from the motor. The boat came with a nice water cooling set up featuring a water cooled RC-Hydro ESC, a brass motor cooling coil and... | 
|
...this trick custom pickup mounted in the Graupner flex drive unit. The pickup looks like a factory original piece. A propeller was not included but a Graupner drive dog adapter was. I was not able to use the adapter with an Octura x445 prop because the prop is too long and did not allow the adapter to screw onto the threads. I was able to use a Prather 220 prop which is shorted then the Octura. | 
|
| I experienced a leak in the first two trials of this boat. I thought that the leak was coming from a seam in the hull but it turned out that the water was actually coming from the flex line even though it is well above water. The water apparently is being pump up the flex cable. The fix was easy, I added a piece of silicon fuel line tube to the end of the brass liner. This effectively sealed the leak, no more problem! |  |
