[PSUBS-MAILIST] Actual Inclinometer Usage Need?

Sat May 16 12:09:56 EDT 2020

 Steve, one more response on this thread.  On the R300, I use the inclinometers on every dive.  I have manual bubble inclinometers for both roll and pitch.  I also have a primary and backup inclinometer sensor for roll and pitch that feed into my PLC and are displayed on the HMI.  For my boat I have forward and aft MBT and a relatively short 2.2 inch span by design between my GG and CB.  So when executing a MBT flood, if the adjustable trim weight location is off then the boat could pitch forward or back.  Under certain conditions this pitch could be extreme enough to trap air in my forward or aft MBT preventing me from diving the boat.  So having the itch inclination angle measurement enables me to mitigate this.  When submerged, because of the small CG-CB spread I can drive the boat into +-45 degree pitch orientation.  Having the measurement enables me to monitor the degree of pitch.  For conventional Psubs with large CG-CB spreads, my guess is that the  measurements of pitch and roll are really not needed under normal operating conditions.  However for abnormal conditions, such as an inoperable vent valve on MBT, it is nice to have these measurements.  
Cliff

    On Saturday, May 16, 2020, 08:29:38 AM CDT, Steve McQueen via Personal_Submersibles <personal_submersibles at psubs.org> wrote:  

 Thanks for all the responses and information. Much appreciated!Steve
On Fri, May 15, 2020 at 3:28 PM MerlinSub at t-online.de via Personal_Submersibles <personal_submersibles at psubs.org> wrote:

Steve on the Euronaut we have multiple of them on all axis. 

One is longitudinal bubble and shows very fine + - 5 °.with less than a half degree. 

We use it during diving to get the boat on a propper even keel periskop depth - before we dive deeper.

Otherwise we lost energy moving forward. 

This is in use on each dive and also to trim the boat stern heavy on the surface.. 

Also helpful during refueling the submarine with fuel. 

Another one is a weight typ from a russian submarine and in longtidudinal direction and rough + - 45 °

Only useful during crash dives in front of enemy aircrafts. 

(Over 45° we use the handheld Microfonspeaker on a spiral cable of the UHF radio.)

One is from a sailboat +-15° and to show trim over the beam - and not very needed. 

Two are from the buble globe typ (flat horizontal discs with the bubble in the center and showing in all horizontal direction the trim. 

One of them is in the diver chamber and in use if we want to move the 750 Kg Anchor weight out and in - and very needed. 

The anchor weight nloks and goes heavy if the boat is not in all direction horicontal. Both have +-5° all over the horizont. 

On a small sub I would recommend only one : A +-5°  longitudinal simple bubble typ. 

If you are for example 2 degree stern heavy you may will not notice it. 

If you drive short over the ground your stern maybe make a lot of mud clouds. 

vbr Carsten

-----Original-Nachricht-----

Betreff: [PSUBS-MAILIST] Actual Inclinometer Usage Need?

Datum: 2020-05-15T14:45:29+0200

Von: "Steve McQueen via Personal_Submersibles" <personal_submersibles at psubs.org>

An: "Personal Submersibles General Discussion" <personal_submersibles at psubs.org>

So how often are small subs needing to know inclination in real life operating experiences? I have bubble inclinometers but am debating if I really need them in a 1 person K-250.  I think the pilot is capable by observatory sensation to have enough awareness of inclination without an instrument. Thoughts? Steve_______________________________________________
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