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



Join the AMS - Registered Forum users can become members of the AMS and it's free ...... To join send an email with your name , address and phone number to amstreasure@googlemail.com


For further details of any events shown here also see the "Shows and Events" section on the forum

*STOP PRESS* Coronavirus. A lot of Clubs have already cancelled all activities. Check carefully before you plan any travel

.

CANCELLED because of coronavirus. Papplewick Pumping Station, Nottingham, Sunday 12th & Monday 13th April
CANCELLED because of coronavirus. Bournville Sub Day, Sunday 10th May 2020

. ,

Submarine, Boating & Sailing Weekend, Norwich MBC, Weekend of 25,26th July

,./
.
Model Boat Convention, Haydock Park (Cancelled this year)

.

Bournville Sub Day, Sunday 13th September

,,,,

Club Submarine Regatta, Furness MBC, Barrow in Furness, Sunday 20th Sept 2020

Who is online?

In total there are 4 users online :: 0 Registered, 0 Hidden and 4 Guests

None


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

Latest topics

» Telemetry on openLRS
David Merriman's Nautilus... EmptyToday at 10:55 am by david f

» RC for Submarines
David Merriman's Nautilus... EmptyToday at 10:39 am by david f

» today's work
David Merriman's Nautilus... EmptyToday at 2:09 am by merriman

» 3D printed sub kits
David Merriman's Nautilus... EmptyThu Apr 02, 2020 10:40 am by david f

» British Submarines in Two World Wars by Norman Friedman publ by Seaforth.
David Merriman's Nautilus... EmptyTue Mar 24, 2020 11:27 am by david f

» stretching sprue
David Merriman's Nautilus... EmptyThu Mar 12, 2020 1:13 pm by merriman

» Arduino proportional control of a piston tank
David Merriman's Nautilus... EmptyThu Mar 05, 2020 2:30 pm by david f

» Looking for Paint Colour Advice
David Merriman's Nautilus... EmptyWed Feb 26, 2020 10:30 am by david f

» Voltage or data measurement by WiFi - Node Mcu (Arduino) - A failed experiment
David Merriman's Nautilus... EmptyMon Feb 17, 2020 11:10 pm by C-3PO

Statistics

Our users have posted a total of 11107 messages in 1818 subjects

We have 845 registered users

The newest registered user is exceed

    David Merriman's Nautilus...

    avatar
    Tom(ADMIN)
    AMS Forum Owner

    Posts : 3002
    Join date : 2010-11-05
    Age : 60
    Location : Nevada, USA

    David Merriman's Nautilus... Empty David Merriman's Nautilus...

    Post  Tom(ADMIN) on Sun Dec 08, 2013 4:14 pm

    David asked me to add this about the Nautilus in the 'painting and weathering' section, so here it is, copied and pasted from David's email:

    ''Some may question how the 31-inch long NAUTILUS was able to maintain depth and maneuver credibly underwater without any practical bow or stern planes. The secret to getting around these traditional control surfaces was to gimbal the propeller about the pitch and yaw axis. Works great and avoids adding any non-scale control surfaces that would otherwise ruin the 'look' of the Disney NAUTILUS''.

    David Merriman's Nautilus... 00510

    David Merriman's Nautilus... 01610

    David Merriman's Nautilus... 02610

    David Merriman's Nautilus... 02910

    [url=https://servimg.com/view/15029581/2593
    David Merriman's Nautilus... 03410[/url]

    David Merriman's Nautilus... 04210

    David Merriman's Nautilus... 04310

    David Merriman's Nautilus... 04410

    David Merriman's Nautilus... 04510

    David Merriman's Nautilus... 04610

    David Merriman's Nautilus... 04810
    nigele(ADMIN)2
    nigele(ADMIN)2
    AMS Chairman

    Posts : 1108
    Join date : 2010-11-06
    Age : 66
    Location : Braintree, Essex

    David Merriman's Nautilus... Empty Re: David Merriman's Nautilus...

    Post  nigele(ADMIN)2 on Sun Dec 08, 2013 4:57 pm

    Why not just move the battery backwards and forwards ?,I very rarely use the dive plains I drive the boat by moving the battery
    merriman
    merriman
    Guest

    Posts : 336
    Join date : 2011-10-16
    Age : 71
    Location : Virginia Beach, Virginia

    David Merriman's Nautilus... Empty Re: David Merriman's Nautilus...

    Post  merriman on Sun Dec 08, 2013 7:46 pm

    At any rate above a critical speed, the short moment arm of the shifting c.g. can't beat the magnitude of the moment arm of the upsetting forces that result from asymmetric dynamic forces acting upon the submerged hull and appendages working to upset the submarine about the pitch axis.

    Shifting fixed ballast weight, pumping trim water, and pixie dust work to effect pitch control below the critical speed.

    David
    nigele(ADMIN)2
    nigele(ADMIN)2
    AMS Chairman

    Posts : 1108
    Join date : 2010-11-06
    Age : 66
    Location : Braintree, Essex

    David Merriman's Nautilus... Empty Re: David Merriman's Nautilus...

    Post  nigele(ADMIN)2 on Sun Dec 08, 2013 7:51 pm

    "WOW"
    merriman
    merriman
    Guest

    Posts : 336
    Join date : 2011-10-16
    Age : 71
    Location : Virginia Beach, Virginia

    David Merriman's Nautilus... Empty Re: David Merriman's Nautilus...

    Post  merriman on Sun Dec 08, 2013 8:12 pm

    ... and that makes me the Master of the run-on sentence!

    David
    nigele(ADMIN)2
    nigele(ADMIN)2
    AMS Chairman

    Posts : 1108
    Join date : 2010-11-06
    Age : 66
    Location : Braintree, Essex

    David Merriman's Nautilus... Empty Re: David Merriman's Nautilus...

    Post  nigele(ADMIN)2 on Sun Dec 08, 2013 8:29 pm

    It sure do David.
    avatar
    Tom(ADMIN)
    AMS Forum Owner

    Posts : 3002
    Join date : 2010-11-05
    Age : 60
    Location : Nevada, USA

    David Merriman's Nautilus... Empty Re: David Merriman's Nautilus...

    Post  Tom(ADMIN) on Sun Dec 08, 2013 8:37 pm

    There's no arguing with that, really...
    david f
    david f
    AMS Treasurer

    Posts : 2086
    Join date : 2010-11-10
    Age : 69
    Location : Cumbria

    David Merriman's Nautilus... Empty Re: David Merriman's Nautilus...

    Post  david f on Mon Dec 09, 2013 9:19 am

    So for subs at low speed, the only control methods available are ballast/weight shifting. (My mental picture is always an airship at hover - not at New Jersey and not with flames licking out from it!)

    At higher speeds dynamic forces are much more significant so dive planes, the hull shape and angle of attack and NOW prop pitch and yaw can all be used. (Think of an airship motoring along rushing through the air)

    I had never thought of moving the prop like that. That is clever! Thanks.

    David
    avatar
    Tom(ADMIN)
    AMS Forum Owner

    Posts : 3002
    Join date : 2010-11-05
    Age : 60
    Location : Nevada, USA

    David Merriman's Nautilus... Empty Re: David Merriman's Nautilus...

    Post  Tom(ADMIN) on Mon Dec 09, 2013 9:28 am

    Similar sort of effect (in a way) to movable side thrusters, maybe?
    bwi
    bwi
    AMS member

    Posts : 81
    Join date : 2015-01-17
    Location : Belgium

    David Merriman's Nautilus... Empty Re: David Merriman's Nautilus...

    Post  bwi on Thu Feb 19, 2015 8:15 pm

    Making way trough the forum and stumbled on this......this is a fine example of “Improvise, Adapt and Overcome!”.
    grtz,
    Bart
    merriman
    merriman
    Guest

    Posts : 336
    Join date : 2011-10-16
    Age : 71
    Location : Virginia Beach, Virginia

    David Merriman's Nautilus... Empty Re: David Merriman's Nautilus...

    Post  merriman on Thu Feb 19, 2015 9:39 pm

    bwi wrote:Making way trough the forum and stumbled on this......this is a fine example of “Improvise, Adapt and Overcome!”.
    grtz,
    Bart

    Then, you'll like this:

    I made the dorsal 'heeling' rudder at the trailing-edge of the phase-2 ALBACORE sail practical -- its deflection driven by a servo controlled by an athwartship oriented angle-keeper; as the boat rolls into a high-speed turn, the dorsal rudder produces a roll moment to counter the heel. Just like the real thing!

    I found this to be a great way to 'put on the breaks', when needing to kill head-way; just start fish-tailing the rudder and the hull and control surfaces work to produce a great deal of drag.

    The last shot is of a phase-3 ALBACORE model, with the counter-rotating propellers and X-tail configuration -- turned on a dime and gave back nine-cents change!

    David


    David Merriman's Nautilus... 008_yg10

    David Merriman's Nautilus... Dscf0510

    David Merriman's Nautilus... 005_0010

    David Merriman's Nautilus... 00710

    David Merriman's Nautilus... 000_0010

      Current date/time is Tue Apr 07, 2020 1:51 pm