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Old Mar 25, 2014, 01:42 PM
R/C Potts...
Grantham
Joined Jun 2008
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Discussion
Bilge pump power?

Realistically, can a pair of bilge pumps be used to propel a 1:350 Typhoon along at a decent pace (ballast system, not dynamic)... and if so, what bilge pumps to use?
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Old Mar 25, 2014, 05:44 PM
Registered User
California Desert... 7 miles from nearest town
Joined Jan 2010
376 Posts
1:350 scale Typhoon submarine
-----------------
This would be a model measuring about
Length = 19.68 inches
Beam = 2.59"
Height (hull only) = .47"
------------
This is a very small subject.
I have never tried building less than 1:44 scale.
I don't know where to even look for items small enough to make this work.

I will watch your progress because this is off interest.
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Old Mar 25, 2014, 10:37 PM
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Philippines
Joined Jan 2005
892 Posts
Think your Typhoon look like the Starship Enterprise.

A pair of bilge pumps would propel it at warp speed.
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Old Mar 26, 2014, 11:51 AM
R/C Potts...
Grantham
Joined Jun 2008
28 Posts
Excellent, redboat! Power to excess (only for emergencies, mind :-D).

Cliffhanger, the Hull is 20.5" long, and about 2.5" wide.

Looking for that 'unique' project, as it seems TK SSBNs have been done to death!
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Old Mar 26, 2014, 12:15 PM
Ah, so its THIS again. . .
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United States, NV, Sparks
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What are you trying to build? The Red October?
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Old Mar 26, 2014, 12:59 PM
R/C Potts...
Grantham
Joined Jun 2008
28 Posts
http://i892.photobucket.com/albums/a.../Photo0075.jpg That's the idea!
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Old Mar 26, 2014, 01:43 PM
Man from Atlantis
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London
Joined Nov 2003
906 Posts
Have you built a sub before?
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Old Mar 26, 2014, 01:56 PM
R/C Potts...
Grantham
Joined Jun 2008
28 Posts
Nope. Just surface boats.
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Old Mar 26, 2014, 02:02 PM
Man from Atlantis
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London
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Okay, I would strongly advise you start with somethign simpler and larger. Howes are flogging the Moebius/Revell Skipjack 1:72 scale for 25 quid at the moment, which is a complete bargain. Get one, and convert that. there are kits available if you are lacking in workshop facilities. Norbert Bruggen does a kit for 120 euro, so you can be in the water for about 150 if you have a radio.
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Old Mar 26, 2014, 02:55 PM
R/C Potts...
Grantham
Joined Jun 2008
28 Posts
Thanks for the advice SubCulture. I already have a radio (Focus 6), hull (dusty Alanger Typhoon from a friend's layapart store), and servos. Looking at finishing up with bilge pumps as: a) it's slightly unique in the slew of Typhoons I have seen out there, b) the pumps offer me space (as far as my block design goes so far) to be a static diver, and c) just like with my boat projects, I enjoy tackling difficult projects head-on. Will keep an eye on the Skipjack / NB kit if this one goes south.
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Old Mar 26, 2014, 07:26 PM
Man from Atlantis
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Okay. Bear in mind that very few modellers build at this small scale, those who do accept that pretty much everything will have to built from scratch, as there is virtually nothing available off-the-shelf for these small models.

The Skipjack has been converted by many modellers, there are at least two commercial conversion kits available, and plenty of good practical advice.
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Old Mar 26, 2014, 07:51 PM
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At this size you will be able to find small motor(s) to drive propellers. The motor/pump will be the hardest part to find that will fit in the hull.

If you go the way of a syringe, you will have to build the gear box to push and pull the plunger.

The simplest system would be a water pump in to a closed ballast tank in to a bladder letting the water reduce the air volume in the hull. The bladder works because it has not fixed shape and will conform to the internal shape.
Remember there can be no sharp edges against the bladder.
I does not turn out well if there is.

Small pumps are out there. I just did a google search for "micro water pump". Then click images and go from there.

Here's one

$8.00
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Old Mar 27, 2014, 12:56 AM
Man from Atlantis
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I've tried those, they're not what I'd describe as micro, also they're not very dependable, the gears are too soft and burn out easily.
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Old Mar 27, 2014, 02:14 AM
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Good to know. about those pumps. Thanks.

I have no experience with them.
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Old Mar 27, 2014, 11:31 AM
Man from Atlantis
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London
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906 Posts
Decent waterpumps are becoming hard to find. Production of many trusted versions moved from European countries to China, and the quality control went straight to hell.

Tiny water pumps are out there, but are extremely specialized and thus the price of these will give you kittens.

There are various options for a baby ballast system, but my advice is to avoid fitting one to start with, and build the boat as a dynamic diver. Leave room for one to be fitted at a later stage.

If you can leap all the hurdles of getting this thing reliably watertight and functioning well as a dynamic diver, adding a ballast system shouldn't pose any major difficulties.
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