Model Boat Mayhem

The Shipyard ( Dry Dock ): Builds & Questions => Submarines => Topic started by: Willit on February 06, 2008, 05:45:21 pm

Title: dynamic diving
Post by: Willit on February 06, 2008, 05:45:21 pm: hi guys

I have always been under the impression that dynamic diving occurs at a certain speed, and that the sub will maintain a depth at this certain speed.

Am I right? I quite like the looks of the Robbe Akula.
Title: Re: dynamic diving
Post by: Mankster on February 06, 2008, 05:49:38 pm: Yes you will need forward motion to dive and to maintain depth. The minimum speed needed to maintain depth may be different to that required to dive. As to how much speed, that depends on how much you ballast it down by :)
Title: Re: dynamic diving
Post by: Hansen on February 06, 2008, 05:50:57 pm: ROBBE is manufacturer of AKULA submarine? Are you sure?
Title: Re: dynamic diving
Post by: Mankster on February 06, 2008, 06:00:00 pm: Dumas Akula?
Title: Re: dynamic diving
Post by: Subculture on February 06, 2008, 07:18:04 pm: dynamic diving is affected by three conditions

1. Buoyancy of the boat
2. Speed of boat
3. Size of hydrovanes/planes.

You can calculate the force your hydrovanes will impart on your submarine with the following formula-

F = C A sin(a) 0.5 r v2

F : Force on hydroplane (kg)
C : Friction coefficient (C = 0.1)
A : Area of hydroplane (m2)
v : Velocity of boat (m/s)
r : density of water ( r = 1000 kg/m3)
a : angle of hydroplane (deg)

More on this here-

http://www.heiszwolf.com/subs/tech/tech01.html#Dynamic%20Diving

Andy
Title: Re: dynamic diving
Post by: bbdave on February 09, 2008, 01:22:19 pm: Excellent link subculture! clears up the mud alot!
Title: Re: dynamic diving
Post by: Powered Boat Mouldings on April 29, 2008, 08:33:16 pm: Hi Willit
Trust me it is very satisfying when you master the art of dynamic diving, as you have to constantly give correctional inputs of the slightest control to maintain a perfect periscope depth. I'm all for self levelling devices but to be able to say I'm controlling that, priceless. Have fun and let us know how you get on.

Regards Rob.
Title: Re: dynamic diving
Post by: Willit on May 21, 2008, 01:57:12 pm: woops forgot about this thread, thanks for the info, and yes, I did indeed mean the Dumas Akula, my bad ::)