----- Original Message -----
Sent: Monday, January 14, 2008 7:21
PM
Subject: Re: [PSUBS-MAILIST]
teathers
Having done many scuba dives in
the area lakes, I have leaned to watch my compass and count my kick
cycles. ...all to no avail. I still come up and have to turn around to
find the boat. :)
I do not have any specific site in mind
but I know that there are people working on integrating low cost
accelerometers into ROV's in order to calculate position. A search on
ROV accelerometer might turn
up something DIY. Let me know if you find something.
A low cost solution by integrating a
digital compass, a sensor connected to the thruster speed circuit and a basic
chip to run a dead reckoning. Some school kids have likely already done
this too.
Even lower cost is a topology map of the bottom, compass and
depth gauge. Works good in lakes with rough terrain, but would
suck in Florida once you could not see a coral head.
Please let me know
if you have anything good, and cheap. :) Thanks --Doug J, Tulsa
OK
-----Original Message-----
From: Recon1st@aol.com
To:
personal_submersibles@psubs.org
Sent: Mon, 14 Jan 2008 5:37 pm
Subject:
Re: [PSUBS-MAILIST] teathers
Doug thanks for the link to drag equation.
I have not run the numbers, don't have them yet, but just looking
at it surprises me.
Which brings me to a point on navigation and communication.
Without surface antenna's any way to accomplish accurate
navigation?
I know there are ways of using GPS and WAAS underwater at depths
but I don't think the navy will loan me the equipment.
And also thanks for the side info on the page
thrust = 35-40lbs per HP
I am sure, this is the first simple conversion it helps us dummies a
lot.
Dean
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