short flex cable filling hull with water

[sampit]

I been having a few problems running a short flex cable in my Rico 31" water in the hull

My problem is the the COG is around 1" to forward so i have removed the motor mount and would like to place the motor 1" further back this will make the cable even shorter and put the cable on a tight angle, is there any tips to stop me filling the hull when i run I tend to run full throttle without any stop starting, but still end up with a good cup full of water in the hull
Would I be better to run a teflon linner? at the moment its just running a 3/16 cable in a 1/4 brass tube with grease
just got a T600 1400kv motor to replace the 1760kv motor in the picture.

[srislash]

Do the silicone tube trick Sam. Put a piece of the tubing (1/4-3/8) on the end of brass tube so it hangs over and seals the flex.

I just did this to my Bling Rocket for the same reason. No water now

[Fluid]

I run a similar setup in my Titan 40 but the motor is further back. I use the silicone tubing trick and zero water after a 2 minute race heat WOT the whole time. No need for Teflon tubing, or heavy grease for that matter. I run 70W synthetic gear oil on my flex cables, many of my boats don't even need the silicone tubing trick.


.

[rickwess]

Any one of you show a pic? I anticipate needing to do the same.

Is the tube sealing the against the flex shaft or just the liner? If it's the flex shaft, how fast does the silicon tube wear out so that it no longer seals effectively.

[tlandauer]

If you are not using the liner, the silicone tube goes over the stuffing tube and will naturally " step down" once it is with the flex cable.
When using liner, I find that it is best to still go over the stuffing tube, meaning that don't just slip over the protruding liner. It really depends on how much of the liner is protruding from the brass tube ( another words , how much longer than the stuffing tube).
Silicone tube last a long time. The tough part is to find the correct diameter to match the stuffing tube and still be tight enough to form a meaningful seal around the cable. Too tight on the cable and you get extra drag. Get a bunch different size silicone tubes and try them on to see for yourself. At least that's the way I have been doing it. Worked out pretty well so far...
DSCN1824_1330.jpg
I used another piece to "collar" down the silicone tube, because I could not use any smaller dia. to go over the brass tube, the "step down" wasn't enough to form a meaningful seal around the cable.

[capnswanny]

A cup of water seems a bit excessive for flex shat entry. Are you sure you don't have a leaky motor jacket or pinhole in a line?

[srislash]

A cup of water seems a bit excessive for flex shat entry. Are you sure you don't have a leaky motor jacket or pinhole in a line?

I agree with caps wanna here. My first runs resulted in a cup of water and I found a 90 on the jacket giving up some water. It was one like the Leopard ones that are two piece design.

[lenny]

I would check that FC esc that you are using for leaks to,
They were having some problems with them leaking at one time that I know of.

[part time rc]

Make sure the leading edge of drive dog is not flat. Needs to be beveled or angled or pointed or chamfered to the shaft. Fixed my problem on a stock Revolt 30.

[Doug Smock]

Hey Sam,
Did you run the stuffing tube all the way up in the stinger until it meets the bushing?

[Alexgar]

this is why i use a stuffing tube with liner and grease

[Rumdog]

linerless, taper the laeding edge of the drive dog and use grimracer grease. dry as a bone.

[Rumdog]

OH! forgot to mention, make sure to use a thrust bearing between the motor collet and motor mount with that outrunner. A single E-clip isn't gonna like that load!

[martin]

The inner piece of silicon tube on the stuffing tube works very well at stopping water, also taking the square shoulder off of the dog with a taper also works well. It stops water being trapped between the stinger & dog & forced into the strut/stinger & up into the stuffing tube.

[sampit]

Thanks for all the help on this one, just started working my way down the list!

Martin any idea as to where i can buy a 6mm thrust washer in the UK as Rumdog suggests i should use on the out runner motor, cant find a 6mm one .