waterproofing

[daisycutter]

Can someone tell me how to waterproof a sub driveshaft?
I'm making a sorta-scale sub which cruises with only the conning tower and a bit of the hull sticking out of the water.I got inspired after watching the torpedo episode of Junkyard Wars,and took apart my Tyco Canned Heat RC car.I plan next to make an aquarium terror sub using BitCharG parts,I am currently working on an bit airplane.

Any feedback will be greatly appreciated

-Big D

[Umi_Ryuzuki]

Since it sounds like you won't be diving very deep, or sailing it like a small boat, try this...

Build a "Stuffing Tube"

Get some telscoping brass tubes. Two sizes, and one brass rod.
I am sure you want this as small as possible.

These should all slide into each other without binding.

Cut the largest tube long enough to reach from your motor to outside the hull. Leave some room between the motor and tube to connect the motor to the rod.

Then cut two short pieces of the next smaller size of tubing and superglue or solder each piece into the end of your large tube.
These "bushing" should be no longer than 1/8"(3mm)

Glue this tube thru your hull with superglue or epoxy.

Push a little vaseline into the tube and then push your brass rod/propeller shaft thru and mount it to the motor using heat shrink or some other plastic tubing.

Add your Propeller and it should be ready to go. ;)

With such a small application, If you are staying on the surface you may just be able to push the propeller shaft thru the hull and put some vaseline over the hull penetration. But it will leak eventually. Even the stuffing tube may leak if you go deeper than say 12"(30cm).

A "stuffing box" is even easier. build a small box inside the hull where the propeller shaft exits the hull, and fill it with vaseline and put a cover on it.

[daisycutter]

How do big subs,model and real waterproof their driveshafts?:confused:

[sinkinpat]

WITH A DRIVE SHAFT SEAL FROM WWW.RCBOATS.COM