Jim,
I've built three subs using the Engel Piston tanks, two detailed on this site.
On both occasions I used simple small nitrile O rings and shaft collars to form a seal on both ends of the prop shaft. Here is the outer hull end of a 4mm prop shaft..........
..................and here is the inner end of the shaft..................
.................with two locking bolts up to the O ring.
By compressing the O rings a litlle (not enough to strain the motor) a tight seal is made that can withstand the pressure of the WTC filling with air when the tanks are full of water. I know a few people (including Engel) have questioned this approach but it works and the O rings hardly ever wear out.
If you want to spend money, Rabosech do a line of fully sealed prop shafts (same principle as mine, there's a compressed O ring in the bulge at the end), a pair will set you back around 100 bucks.
Both my method and the Raboesch prop shafts are superior to the Engel silicone hose method in my view.
The Boattrainman
I've built three subs using the Engel Piston tanks, two detailed on this site.
On both occasions I used simple small nitrile O rings and shaft collars to form a seal on both ends of the prop shaft. Here is the outer hull end of a 4mm prop shaft..........
..................and here is the inner end of the shaft..................
.................with two locking bolts up to the O ring.
By compressing the O rings a litlle (not enough to strain the motor) a tight seal is made that can withstand the pressure of the WTC filling with air when the tanks are full of water. I know a few people (including Engel) have questioned this approach but it works and the O rings hardly ever wear out.
If you want to spend money, Rabosech do a line of fully sealed prop shafts (same principle as mine, there's a compressed O ring in the bulge at the end), a pair will set you back around 100 bucks.
Both my method and the Raboesch prop shafts are superior to the Engel silicone hose method in my view.
The Boattrainman
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