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Postby aquadeep » Fri Sep 19, 2008 12:22 pm

For a propultion motor from what I can see your sub is quite streamlined with a small cross section.
With a 3.5 inch prop I would sugest the standard setup I use for subs of this size.

A 12 Volt RS -550 HS type motor are very effecient and very powerfull and run cool.

Just instal this gear box a double ballbearing nylon gear and brass pinion sealed gear box unit by MasterAirscrew and the ratio is 3.5.Have never had to replace one yet all these years.

You will find with this combination that plenty of power and very slow prop speed is obtained without high amprage use.My subs nurmaly run for 2 to 3 hours continuesely with this motor/grearbox and similar prop,even turning a waterpump though not realy necesary.I like to watercool the drive motors.
remove the setscrew on the prop adapter and a 3/16 shaft is there.I then install a MILL spec U joint of stainless steel,Ill sell you one if you like.Or just use a different one.

Tower hobbies has them.http://www3.towerhobbies.com/cgi-bin/wt ... LXZ900&P=7
You can perchase every part of the gear box fom the manufafturer and great prices.
Get the motor on Ebay or surplus for around 5 bucks
Ill get that list of parts for the ballast system for you soon .

Dave :D
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Postby Pirate » Sun Sep 21, 2008 11:43 am

Dave,
Can you post a higher resolution drawing of your ballast system? Can't read anything on this shot. I'm interested too as I will be building my own soon.

Thanks,
Pete
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Postby Bigdave » Sun Sep 21, 2008 1:26 pm

For motors you may want to check out the Integy lathe motors.
Tower sells them. They are very high turn 550 size motors sold to run model motor lathes. I got this tip from Darrin H. He says you can run props this size direct drive easily. Very high torque. BD.
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Postby Pirate » Sun Sep 21, 2008 10:40 pm

BD,
I looked up those motors. They are listed as 45T, 55T, 65T, 75T, and 85T. Are these the ones you're suggesting here? And which is the 550?

Do you know what the differences between the numbers are?

Will it run on 12V too?

Pete
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Postby Bigdave » Mon Sep 22, 2008 8:19 am

Hi Pete,
I am not sure on the voltage. It may say on the home web site for the motors.
They are all 550 motors in size. :D
The difference is the speed and torque.
The higher the number the slower the motor will spin but the higher the torque will be. The 85T (85 turn) motor will spin the slowest. The 45T will spin the fastest. Darrin said the 55T was equivalent to a Dumas Pitman. I have not tried them but he is very impressed. BD.
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Postby Rogue Sub » Mon Sep 22, 2008 11:10 am

so that 85 t could definately do direct drive. I feel a product review coming on!
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Postby Bigdave » Mon Sep 22, 2008 11:33 am

That sound like a good idea. 8) :idea:
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Postby Rogue Sub » Mon Sep 22, 2008 10:31 pm

Ok I went to the source on this one and talked to the guys at integy about the motors.

-these are 540 size motors

-the official spec is 7.2V/8.4V ... but I know people are using 12V with them.

-so if you are running 540 size 27T. The 55T will run much slower, maybe several times slower but with several times but torque.

-I think 85T will be twice as slow as 55T

-6100RPM for the 55 on 6 volts

So this means to me that an 85t with 12 volts will yield ~6100rpm w/ less current.

Only question now is will 6100prm be good enough to make this boat move along with the given pitch of the prop.

Here is the link
http://www.integy.com/cgi-bin/webc.cgi/ ... p_catid=26

Oh I also cut out my missile hatch doors today and started depening the scribe lines around the other hatches. I am doing that because they are all supposed to be separate from the turtle back so I want to try and enhance this look with the others so that the two working hatches dont stand out.
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Postby aquadeep » Mon Sep 22, 2008 11:37 pm

Yes I will make a higher resulution plan for the dive system along with parts list.

Also nuke power check out the mini hydraulics for yor doors,very compact system that will actuate as many doors as you like with stunning realism!

See my video clip on the forward dive planes of the Type XXI.

Dave :D
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Postby Sub culture » Tue Sep 23, 2008 9:21 am

Over 6k sounds too high to me.

My motor cranks around at 2500RPM, and about 1700 RPM under load, with the prop in a bucket.

I'd be aiming for an unloaded speed of a similar figure for your Ohio.

Andy
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Postby Rogue Sub » Tue Sep 23, 2008 11:15 am

David
Not sure I want to go with hydraulics because I want to keep it as simple as possible as far as mechanisms. Not to mention the real door opens in about 1 sec.

Andy do you mean it is 2 slow. I believe the 6k is an unloaded rating. I will probably try out the two extremes of the motors I.E. the 55t and 85t. I just can see buying 100 bux in motors just to use one. There is also another motor a friend has that i will be trying out.
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Postby Rogue Sub » Sat Sep 27, 2008 1:23 am

Started work on the missile hatch door mechanisms and detail. Of course I need to get my lathe to finish them off by making the breach seals. Still need to do some filling and other little details on them but its off and running.
I also made them held in by a pin so that removal is a snap!

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Postby Tony G. » Sat Sep 27, 2008 12:08 pm

Very nice work Kevin.
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Postby Rogue Sub » Sat Sep 27, 2008 2:06 pm

Thanx Tony your my hero!

Started fitting up the hatches today they still need to be cleaned up and more detail added but its going well. Need to decide how I want to do the linkages and so on next.

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Postby petn7 » Sat Sep 27, 2008 2:20 pm

Two curiosity questions:

1. What kind of glue are you using?
2. How far "back" do the missile doors swing? All the way back like a flower petal or only as far back as to keep the doors at a 90 degree angle with the hull deck...or somewhere in between?
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