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belt drive unit



I am a recent airboat owner and needs some advice?
I have a diamondback aribotat pushed by a vw engine with a 2:1 belt reduction unit. The question is on the drive belt unit. It has approximately 6 small belts driving the prop. My question is what type of unit is this, where do I get spare belts, and how do I get the tension off the belts to change the belts.
One other quick question, I live in Wisconsin and the weather has gotten colder and it seems to affect the performance of the boat, not engine wise, but how the prop pushes the boat. Am I crazy or does air temperature affect how the prop operates. It seems the prop spins out at times and does not push, or else the belts may be slipping.

Any info to the new airboat fan would be greatly appreciated.....