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>what are the advantages of controlling speed by propellor pitch (as in >Gavins and clones) as opposed to voltage/gearing combinations (as in >Aquazepps). Because electronic control systems are inherently less reliable. As an electrical engineer that spent 15 years running charter boats I can confirm from personal experience that water and electricity coexist very poorly. Even if a scooter never leaks and is run exclusively in fresh water it is in a high humidity environment which is not friendly to electronics. And, even without the added stress of the damp environment electronic components do fail. The adjustable pitch prop is very simple, has few moving parts and will be less likely to fail, a desirable trait when one is a distance back in a cave. >A runaway Zepp can be stopped by putting the voltage switch into >"neutral" (midway between 12V and 24V settings) if a trigger or relay >jams open. What options are available on runaway Gavins (and it does >happen sometimes)? The prop can be feathered to reduce the speed to dead slow if necessary. >How do you stop from deep-discharging the batteries? Easy enough with a >light battery -- it starts to go yellow. Do scooters give up any early >warning signs or do you base it purely on burn time? I guess if it is a >choice between a long swim and save the batteries or new batteries and >save yourself then you'd do the latter, so maybe this is a moot point? The batteries are burn tested and the max run time based on the results. >Anybody using the Silent Submersion Gavin clones? No, but I've seen one. Stick with the real thing. Skip -- Send mail for the `techdiver' mailing list to `techdiver@aquanaut.com'. Send subscribe/unsubscribe requests to `techdiver-request@aquanaut.com'.
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