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neutron256 Also, about the Seadoo SC, that wheel looks really heavy, the blades are really thick (did you notice that too) ... I tried to do some reading online and concluded that since water-crafts hop over waves while in full throttle, their engines go thru very extreme rpm fluctuations ... impellers are not able to keep up with such fluctuations. As a result, they had to introduce a clutch assembly to the supercharger drive so that the impeller can 'slip' during such fluctuations. For the impeller to maintain its rpm during fluctuations, they had to give it more weight/momentum so that it can 'slip' well.
Do you see this helping/hurting this application ? Does a heavy impeller translate into a less responsive engagement. Also, a heavy impeller means bigger current draw while the impeller accelerates to its peak rpm. Your thoughts ?