[PSUBS-MAILIST] Air comp

Sat Aug 12 16:10:05 EDT 2023

 Jon, I wish I thought about this volume test before the dive, I would have made sure it was accurate.  I think it was 3000 psi, but can't guarantee it.  More testing is needed.  Hank
    On Saturday, August 12, 2023, 12:31:43 PM MDT, Jon Wallace via Personal_Submersibles <personal_submersibles at psubs.org> wrote:  

  It does kind of confirm the air consumption issue Cliff was concerned about which would make replacement of the air-tank a primary design consideration as well as planning for extra tanks.  Calculates to a max of 4 dives to 400 feet per tank assuming a 3000psi start, maybe three dives for 4 inch diameter 101's.  Folks with 1000 foot capability are going to use a lot more air.  Also demonstrates we can't simply calculate the volume of the motors.  All the hoses and parts that make up the plumbing have to be considered.
Jon

    On Saturday, August 12, 2023 at 01:26:58 PM EDT, hank pronk via Personal_Submersibles <personal_submersibles at psubs.org> wrote:  

  Cliff, my thrusters are 3 inch housings, so smaller than yours. I have two scuba second stage hoses  and about 12 feet of 5\16 hose going to the aft motors.  The whips are 1\4, but I wanted bigger to compensate for the length.  The tank may have been a bit under also.  The system is pretty tight because this morning when I checked the aft motors, they gave off a puff of air, and the tank was shut off when I loaded the sub.Hank
    On Saturday, August 12, 2023, 11:07:05 AM MDT, Cliff Redus via Personal_Submersibles <personal_submersibles at psubs.org> wrote:  

  That's interesting.  I calculated you would I would go from 3000 psig to 2,832 psig from a 80 scf tank at 400 feet for four MD-101 thrusters alone.  2,250 is a bit lower than expected.  Are these MK 101's ?  Are you using the air in this scuba tank for anything else?  My calc does not take into account tubing connecting the regulator to thrusters.  How many liner feet of tubing do you have and what size?
Best

    On Saturday, August 12, 2023 at 10:47:16 AM CDT, hank pronk via Personal_Submersibles <personal_submersibles at psubs.org> wrote:  

 Cliff, the pressure in my 80 cu tank dropped to 2250 from 3000 to supply the 4 motors to 400 feet.  Hank

Sent from my iPhone

On Aug 11, 2023, at 7:51 PM, Alan James via Personal_Submersibles <personal_submersibles at psubs.org> wrote:

Thanks Hank, look forward to any videos.Alan

Sent from Yahoo Mail on Android 

  On Sat, 12 Aug 2023 at 1:41 pm, hank pronk via Personal_Submersibles<personal_submersibles at psubs.org> wrote:   _______________________________________________
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