Re: [PSUBS-MAILIST] Minn Kota - Thrust

["Paul Suds" <paul_suds@hotmail.com>]

Jon, I really like your AUV design. You have a real talent for graphic 
design. I would however,  rethink your speed sensor. I designed air flow 
sensing in the past for air samplers. Hall Effect sensors such as Alegro"s 
are easy to use and design stuff with, and they are good from a purely 
digital perspective. Unfortunately, if this unit was operating in areas of 
variable current, your location mapping would be in error. If you have 
already broached the sonar and ultrasonics detection for depth and collision 
avoidance, you may want to also incorporate this knowledge of yours into 
determining speed as well. I've looked at doppler for air flow analysis and 
it may be something to consider. You could use an array to orient a point of 
reference on the bottom or top surface of the water and integrate these 
values to determine speed. This would be a lot more accurate. Again, I love 
your designs and concepts. Keep up the good work.
paul
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