ThunderTiger Neptune SB-1 New Kit! - Page 2 - RC Groups
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Jan 25, 2009, 08:32 PM
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Hey Aquadeep, I read another thread where they said the lead acid battery charger wasn't working right either. Mine seems to have the same problem. You could buy a new one for like $6.00 from
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Jan 29, 2009, 11:23 PM
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Some vedeo footage,deep bive to 16ft and back.

sub action (0 min 39 sec)

devils den submarine action (1 min 52 sec)
Jan 30, 2009, 04:39 PM
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16 ft? GREAT!
Very impressive...
Jan 30, 2009, 07:58 PM
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Have you tried another sub in the same water? It could be that the water is poluted with metals or clorine ect.Thats what it sounds like to me these are mass produced units and the quality control is very tight.i have been in touch with other SB-1 owners and they dont report this problem.
Try a diferent pool or pond and it should be fine.
where did you buy yours?

I plan on going even deeper in very clear water later and use my pontoon boats depthfinder to verify the depth.

Jan 30, 2009, 08:31 PM
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I think it's relatively easy to get deep radio range, as long as you're standing at the edge of the water, and your submarine is just about straight down from your feet. However, when your submarine is further away from you, the submarine can't go as deep before loss of radio contact.

Nonetheless, 16 feet is still impressive.
Feb 01, 2009, 03:17 PM
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I have just modified the SB-1 to use a larger batery .From the 2.3 amp hour one to a 4.0 amp hour .By useing a dremel tool the craddles are enlargeed so that the new batery fits right in.

The original frame rounds still retain there shape althugh prity close to running out of space.Strenght is good since the outer tube casing also holds the frame in place.

The tubbing from the pump had to be re routed so that it went back around the batery instaed of under it as was originaly done,then the T fitting was made at the front and the pressure sensor remained in the same place,just a bit more tubbing and a better T fitting was used.

I should get much longer run times and I will have to reballance the sub by removing and adjusting the wieghts.

Also I plan on replaceing the direct drive motor with a planetary gear drive unit that will have a 3.33 to one ratio for even longer run time with a redesighned prop kort knozzle and stern planes.

The gear drive is a MP Jet unit and are very well made with ball bearings
and one piece housings and special gears,the kit comes with grease lock tite and pinion gear for regular 550 /600 can motors.Cost 25.00$
I might make it water cooled,that also aids in longer run time.

I have already painted her to be metalic silver and burgundy red,clear coated several times all with automotive paints that are very atractive and long lasting.

Led high intensity lihts will also be installed as well as the color camara,but will come later.
Check out the vedeo in the Deep south group section.

Dave Amur Ship Yard
Last edited by aquadeep; Feb 01, 2009 at 03:50 PM.
Feb 02, 2009, 05:50 PM
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A new update ,just ordered the new batery that replaces the 4.0 amph to 5 .0 amph ,even beter run time,it will wiegh more but Ill just remove more of the bottom wieghts till balanced.
The batery is made by Powertron and is available at Sun Batery Co. in Jacksonville Fl. ask for the PT512 12v 5.0 batery. A reasonable 24.95$

Sorry for a mistake, the salesman sent me the rong batery and there is no other updated batery except the 4.0 amp hour .Which will do just fine ,at least I got to keep the rong batery! The one needed for the mod is longer and a bit thicker than the standard 2.3 AMH one ,and fits right in lenght wise. I will post the model number later.
Last edited by aquadeep; Feb 03, 2009 at 10:55 AM.
Feb 02, 2009, 06:21 PM
What is this a center for ants
avidjeepr's Avatar
Thanks for the review,,i will have mine Thursday..
Feb 03, 2009, 10:59 AM
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Great ! let me know how she runs,be sure to get a charger that will fully charge the main battery.

Feb 07, 2009, 11:51 AM
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Just tested the inner casing in the bathtub and to my joy with just guesing the amount of weigths to use and position ,it floated level and slightly higher than out of the box.Just one center and large washer wieghts where removed and moved the remaining wieght to the center and slightly to the aft.Great ballancing system ,so easy to use!

Once the sides and aft components are installed it should be just about right.

The run time should be greatly increased with the Powertron PT412A 4.0 amp battery from the 2.3 amph one .

Next mod is the installation of the greardrive and led lights switched on the #5 channel.

And then the acsses port for charging on the front plate,made from stainless steel.

Dave Amur Ship Yard
Feb 07, 2009, 02:45 PM
Registered User
What rpm does the motor run at the moment? This sub is already slow, wouldn't fitting a reduction gear box slow it down somemore? You could just run it at half throttle the way it is at the moment to get longer run times.
Feb 08, 2009, 09:26 AM
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The motor directly turns a prop that is too small for the size of the sub,at full it will cruise well but it will use up more power.

By installing a 3.5 to 1 gear reduction and then a much laurger prop say a 2.5 to 3.5 inch size with a moderate to high pitch in a 3 to 6 blade prop will give more thrust and speed with less power usage.
This kind of setup has worked on my subs for years ,motors run cool and maximum run time is obtained.

Finishing up on the paint job so far looks great!

Will post pics soon.

Feb 12, 2009, 10:06 PM
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More video ,this sub is amazing at how well it holds its level even at very slow speed.
Untitled (4 min 10 sec)

Feb 13, 2009, 12:42 AM
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Modifications in progress and with stern planes and larger prop and rudder/kort knozle assembly.Normaly censored.

Tested main drive with a 5 to 6 times speed increase ,will post pics of stern mod and paint.

Dave amur ship yard
Feb 13, 2009, 08:45 PM
What is this a center for ants
avidjeepr's Avatar
I picked up the sub.
Not sure what to disassemble to put the camera in..Sorry for the lame question, but what bolts do I remove without removing to much. Thanks

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