Model Boat Mayhem

The Shipyard ( Dry Dock ): Builds & Questions => Navy - Military - Battleships: => Topic started by: Jack D on April 01, 2013, 10:53:23 pm

Title: 1:72 destroyer Drive systems
Post by: Jack D on April 01, 2013, 10:53:23 pm

 
Hi all.
 
I'm thinking of building a 1:72 scale K class destroyer with two props, but I'd like to get as much running time out of it as I can. Are there any recommendations? I was thinking of either two small low drain motors in parallel driving the shafts or one big motor driving both shafts at once via a belt system.
 

Title: Re: 1:72 destroyer Drive systems
Post by: Umi_Ryuzuki on April 02, 2013, 04:54:46 am

My Italian Maestrale Class started out with two DUMAS 6 volt motors direct drive to 40mm propellers.
It later transitioned to two PITTMAN 14volt motors when I changed the systems to 12volt batteries.

Both ran systems ran great and could push the boat well past a scale speed.

 :-)

Title: Re: 1:72 destroyer Drive systems
Post by: thunderchild on April 02, 2013, 11:50:10 am

Good Day Jack
 
I'm building a 1/72 scale Tribal Class Destroyer. She's fitted with 2 x Graupner Speed 720BB Torque 12 volt motors, turning 45mm props, each motor is run by a Viper Marine 15 (Plug and Play) ESC, both fed from a 12 volt, 7.2 A/h battery. Each motor pulls approx .9 amps unloaded (or 1.8 A/h together). When our club sails, sunday morning 0830 to 1130, I have yet had to change a battery during the sailing (she also very quick).
 
(http://i1221.photobucket.com/albums/dd468/Rogue-Wolf/Stage10-MotorMounts4.jpg)
 
(http://i1221.photobucket.com/albums/dd468/Rogue-Wolf/Stage11SeaTrials-AruntaatSpeed.jpg)
 

Title: Re: 1:72 destroyer Drive systems
Post by: Jack D on April 03, 2013, 12:20:11 pm

Thanks for the replies!
I actually use a Graupner 720bb motor with a 40mm prop on my 1:48 Flower class Corvette and I'm really happy with the battery life- it can do about ten miles on a full charge from a 12v 7ah battery.
I just wasn't sure if you could actually get a 12v 7ah battery on board a destroyer due to its fairly narrow beam. However if I could it would be ideal- just carry a spare in a backpack and it could probably do any canal run fairly easily.

Title: Re: 1:72 destroyer Drive systems
Post by: Umi_Ryuzuki on April 03, 2013, 07:42:55 pm

I use a 12 volt 3.3ahr battery.

It is smaller, and I get a decent run time out of it.

 ok2

Title: Re: 1:72 destroyer Drive systems
Post by: Rob Wood on April 06, 2013, 07:52:58 am

To Thunderchild: What is the make and model of your tiller arm?

Thanks,

Rob

Title: Re: 1:72 destroyer Drive systems
Post by: thunderchild on April 06, 2013, 08:32:13 am

Good Day Rob
 
The brand wasn't listed when I bought them, the link is below (but I think they're a Robbe item), you get sleeves for both 3 and 4 mm shafts. It's the third item on the page.
 
http://www.cornwallmodelboats.co.uk/acatalog/tiller-arms.html (http://www.cornwallmodelboats.co.uk/acatalog/tiller-arms.html)
 
Richard

Title: Re: 1:72 destroyer Drive systems
Post by: Rob Wood on April 07, 2013, 04:32:52 pm

Thanks, Richard!

Rob