[PSUBS-MAILIST] Sub Launch at Harbor

Wed Aug 26 20:02:12 EDT 2020

 Brian, I put down spouts on the MBT's to make sure air can bleed off on crazy angles.Hank
    On Wednesday, August 26, 2020, 5:51:11 PM MDT, Brian Cox via Personal_Submersibles <personal_submersibles at psubs.org> wrote:  

 David,  Right , anymore of an angle and I quite possibly would not be able to get the nose up due to air bleeding out the bottom opening.
Brian

--- personal_submersibles at psubs.org wrote:

From: David Colombo 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 16:34:01 -0700

Brian, good thing it was shallow there.  It would be quite a ride to determine how long it would take to level off with that angle snd it was deeper.David 
On Wed, Aug 26, 2020, 2:21 PM Brian Cox via Personal_Submersibles <personal_submersibles at psubs.org> wrote:

Alan,  Underwater I was sitting at nearly a 45 degree angle, with the nose on the bottom and the sphere up.
Brian

--- personal_submersibles at psubs.org wrote:

From: Alan 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: Thu, 27 Aug 2020 08:44:53 +1200

Congratulations Brian,how was the stability when you were under? Did you move up in to the conningtower & shake her around?You should have done a circle underwater.Alan
On 27/08/2020, at 5:12 AM, Brian Cox via Personal_Submersibles <personal_submersibles at psubs.org> wrote:

Cliff,   I think that would only delay the inevitable , I think I would still be at the same angle.
Brian

--- personal_submersibles at psubs.org wrote:

From: Cliff Redus via Personal_Submersibles <personal_submersibles at psubs.org>
To: Brian Cox via Personal_Submersibles <personal_submersibles at psubs.org>
Subject: Re: [PSUBS-MAILIST] Sub Launch at Harbor
Date: Wed, 26 Aug 2020 16:44:48 +0000 (UTC)

 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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