[PSUBS-MAILIST] Sub Launch at Harbor

[Cliff Redus via Personal_Submersibles]

 Congratulations on the successful surface maneuvering test and dive.  You might want to experiment with different orifice inserts in the forward MBT vent opening to see if you can reduce the pitching moment when flooding by reducing the flowrate of air out of this tank.  I use this technique on the R300 for the same purpose.
Cliff


    On Wednesday, August 26, 2020, 11:27:53 AM CDT, Brian Cox via Personal_Submersibles <personal_submersibles at psubs.org> wrote:  
 
 Yeah, that's my super secret emergency dive procedure !
Brian


--- personal_submersibles at psubs.org wrote:

From: Alec Smyth via Personal_Submersibles <personal_submersibles at psubs.org>
To: Personal Submersibles General Discussion <personal_submersibles at psubs.org>
Subject: Re: [PSUBS-MAILIST] Sub Launch at Harbor
Date: Wed, 26 Aug 2020 12:03:20 -0400

Hey, that wasn't a launch, it was a dive!! Congrats! When the bow went down like that, did it rest on the bottom? That was a pretty radical angle, and the speed of it makes me think you had a massive free surface displacement in the MBT. Normally that induces lateral instability, but due to the length of your boat in this case it would be longitudinal instability.
Thanks,Alec
On Wed, Aug 26, 2020 at 10:44 AM Brian Cox via Personal_Submersibles <personal_submersibles at psubs.org> wrote:

Hi All,                 Have a couple of videos from down at the harbor:

https://www.youtube.com/watch?v=iERfLiioGJA&t=628s



https://www.youtube.com/watch?v=OGiAqeocq4s


Cheers,
Brian

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