Thomas-

So you are saying here that at 3 knots the force that you would exsert
holding yourself stationary in DIR config would be 90lbs? And at 7 knots
500lbs?

This analysis seems to be correct as with a scooter putting out 40lbs of
thrust you should only be doing 1.5kt or so, at least that's what it feels
like.

This should put the final nail in this "7 knot current" thing, as I have not
seen a pickaxe yet that you can hold onto with 500lbs dragging you
downstream.

   Jim

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> From: "Charlie Allen" <charlie.allen@us*.ne*>
> Date: Thu, 2 Aug 2001 21:30:55 -0700
> To: <techdiver@aquanaut.com>, "Rogers, Thomas A"
> <Thomas.Rogers@PS*.Bo*.co*>
> Subject: Re: Drag force generated by a diver in the water
> 
> Do you have any comparison of the drag forces of DIR setup vs.
> non-DIR jacket BCD setup??
> 
> Charlie Allen
> 
> ----- Original Message -----
> From: "Rogers, Thomas A" <Thomas.Rogers@PS*.Bo*.co*>
> To: <techdiver@aquanaut.com>
> Sent: Thursday, August 02, 2001 1:39 PM
> Subject: Drag force generated by a diver in the water
> 
> 
>> 
>> I ran some calculations on the Drag force (lbs) which would be
> generated by a diver in the water as a function of the current.
>> 
>> These are ROUGH numbers.  I am also assuming this test subject
> has perfect trim and is not moving.
>> 
>> The test subject was 220 lbs and 76 inches tall. I ran 4
> configurations.  I used PST 104 tanks and a 6 in EE light
>> 
>> Streamlined means Basic DIR setup with canister light and legs
> straight.
>> Bent Knee means Basic DIR setup with canister light and legs
> bent.
>> 
>> Current Velocity (knots) 1 2 3 4 5 6 7
>> Streamlined -single 9 36 82 146 227 327 446
>> Bent Knee - single 16 67 151 269 420 605 823
>> Streamlined -Double Tank 10 42 94 168 262 377 513
>> Bent Knee --Double Tank 18 73 164 291 455 655 891
>> 
> 
> 
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