The Association of Model Submariners.

Would you like to react to this message? Create an account in a few clicks or log in to continue.

* THE FORUM FOR ALL THOSE INTERESTED IN BUILDING AND OPERATING MODEL SUBMARINES *


What would be the right trim level  14212712

Just a reminder that this Forum will close for posts next November (2025) . It will continue to be available as a reference on the Wayback Machine https://web.archive.org/

What would be the right trim level  14212712

For a guide to past events see the "Shows and Events" section.
B i
::::

S

P~~~

$$$

Who is online?

In total there are 3 users online :: 0 Registered, 0 Hidden and 3 Guests :: 1 Bot

None


Most users ever online was 180 on Tue Nov 05, 2019 6:03 am

Latest topics

» Microprocessor choices
What would be the right trim level  EmptyWed Dec 04, 2024 7:26 am by geofrancis

» Robbe Seawolf V2
What would be the right trim level  EmptyWed Dec 04, 2024 7:17 am by geofrancis

» Futaba -868/915mhz equipment
What would be the right trim level  EmptyTue Oct 29, 2024 4:46 pm by tsenecal

» RC Drift Gyro for pitch control
What would be the right trim level  EmptySun Oct 20, 2024 2:04 pm by geofrancis

» WW2 mini sub build
What would be the right trim level  EmptyThu Oct 17, 2024 2:34 pm by geofrancis

» sonar data link
What would be the right trim level  EmptyMon Oct 14, 2024 4:31 pm by geofrancis

» ExpressLRS - 868/915 Mhz equipment
What would be the right trim level  EmptyFri Oct 11, 2024 8:58 pm by Marylandradiosailor

» Flight controllers as sub levelers
What would be the right trim level  EmptyFri Oct 11, 2024 8:14 pm by geofrancis

» 868/915 Mhz as a viable frequency for submarines.
What would be the right trim level  EmptyThu Oct 10, 2024 3:21 am by tsenecal

Statistics

Our users have posted a total of 12536 messages in 1992 subjects

We have 1021 registered users

The newest registered user is Mike Echo

2 posters

    What would be the right trim level

    avatar
    Michaelc


    Posts : 32
    Join date : 2021-04-22

    What would be the right trim level  Empty What would be the right trim level

    Post  Michaelc Fri May 28, 2021 11:14 am

    Hi chaps. Today I started to work on my drenell T class sub. First time in water. This is just the bear hull with props in place. The hull fills water and goes to the bottom like a stone. So here are my questions.
    1. Should the hull itself have negative buoyancy when in the bear state or should it sink.
    2. How low should the hull sit in the water when WTC cylinder is included.
    Thanks, Michael
    salmon
    salmon
    AMS Forum Owner


    Posts : 312
    Join date : 2011-09-02
    Age : 64
    Location : Las Vegas, Nevada - USA

    What would be the right trim level  Empty Re: What would be the right trim level

    Post  salmon Fri May 28, 2021 4:32 pm

    Just the bare hull? Do you have a ballast system installed?

    If you have a ballast system, and what type, will make the best advice if it should be negative buoyant or positive (and add personal preference into the mix). I have gas based systems that I keep positive buoyant (so with tanks flooded about an inch or about 25mm above the surface).
    If it is just a empty hull, then yes it will sink as the material it is made from is heavier than water (~ 1 to 1.7 times I have been told). If you are doing this to figure what size ballast tank you need to lift it up, Then you add closed cell foam to the sides (below waterline) or beneath until you get the correct waterline. Then add a percentage just as a safety and to compensate for add ons.

    Did this help or did I completely miss answering your question?

    Peace,
    Tom


    _________________
    If you can cut, drill, saw, hit things and swear a lot, you're well on the way to building a working model sub.

    david f likes this post

    avatar
    Michaelc


    Posts : 32
    Join date : 2021-04-22

    What would be the right trim level  Empty Thanks

    Post  Michaelc Fri May 28, 2021 9:03 pm

    Thanks. Will play with the foam tomorrow.

    david f likes this post


      Current date/time is Thu Dec 12, 2024 8:21 pm