Build pics of my Aeromarine Titan 33

[Chuck E Cheese]

no the bearing doesnt keep water out, grease does. check all your cooling lines. i would work your way up in props. 447, 1450,450 but stick with 2 blade until you figure it out, 3 blades are alot of prop..

[OshkoshMono]

Ok, ya I wonder if I do have a leaky line. Probably from the octura pickup I just added since the stream off that outlet is much stronger than the rudder pickup, it may have too much line pressure. I am pretty impressed with how much that pickup flows though.

[steve-b]

Greese is great.
For a little added insurance i like to put a piece of fuel tube between the strut and drivedog, i also like to add a piece of heat shrinktube to the stuffing tube in the hull.
I put my thrust bearing at the motor.

[OshkoshMono]

Greese is great.
For a little added insurance i like to put a piece of fuel tube between the strut and drivedog, i also like to add a piece of heat shrinktube to the stuffing tube in the hull.
I put my thrust bearing at the motor.

Cool idea! I'll give it a try. Do you have a peice of fuel line on the motor end of the tube under the heat shrink, or just heat shrink right onto the flex?
I thought I had enough grease in there, but I just repacked it full. Thanks!

[Fluid]

Thrust bearings on Neu motors are probably not a good idea, in fact they can hurt more than do any good. The bearings Neu uses are designed for high axial loads and with their pinned endbells work great as-is.

The problem with external thrust bearings is getting the preload correct. Since Neu motors have little if any axial play, it is far too easy to install a thrust bearing with excessive preload - meaning a bind and excess friction. Set any thrust bearing too loose and it provides no function. Best to leave the external thrust bearings for cheaper motors with cheap bearings or glued endbells.


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[OshkoshMono]

Thrust bearings on Neu motors are probably not a good idea, in fact they can hurt more than do any good. The bearings Neu uses are designed for high axial loads and with their pinned endbells work great as-is.

The problem with external thrust bearings is getting the preload correct. Since Neu motors have little if any axial play, it is far too easy to install a thrust bearing with excessive preload - meaning a bind and excess friction. Set any thrust bearing too loose and it provides no function. Best to leave the external thrust bearings for cheaper motors with cheap bearings or glued endbells.


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Ooo, good point, I didn't know that, but it makes sense. Thanks Fluid! So to keep water out, just grease grease grease eh? Don't some guys put a sponge in the boat where the water collects also?

[JMSCARD]

Greese is great.
For a little added insurance i like to put a piece of fuel tube between the strut and drivedog, i also like to add a piece of heat shrinktube to the stuffing tube in the hull.
I put my thrust bearing at the motor.

I do this on my boats too... the fuel tube keeps alot of water out!

[OshkoshMono]

I do this on my boats too... the fuel tube keeps alot of water out!

Do you cut the fuel line to be the same size as the gap between the strut or stinger and the drive dog, or more like 2/3 of the gap length?

[Fluid]

I prefer a piece of fuel tubing on the inside end of the stuffing tube. It has worked on every boat I've built in the past ten years using it. My boats never have more than a few drops of water inside after a 2 minute race heat with the tubing in place. It does need to be squeezed a bit from a cable tie to just barely touch the flex cable or wire driveline.

Putting a piece of sponge or folded paper towel is okay if the "leak" is small. Several club members who can't solve their water problems do that. All it does is keep the water from sloshing around, but sometimes that can be enough to prevent a wet ESC or pack.



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[Chuck E Cheese]

the best way is to find the leak and stop it. i have never had a problem with water coming in from the shaft, it is usually from somewhere else

[OshkoshMono]

Leak is taken care of, it was coming in the stuff tube. I finally got some decent video. I do need a better prop for sure. Seems to be running a little wet. Anyway: http://www.youtube.com/watch?v=Vl8F1MQLTro

Turns pretty good eh?

[Fluid]

Turns well, but like all monos it will turn better to the right. Why only left turns in the video???

It's not running too wet considering the calm water. You can kick up the prop end of the strut a tad or move the CG back a little to loosen it up some, but then in rough water it may be too flighty. Try a P230 prop on that setup, it will run faster and shouldn't be too much - be sure to check temps often until you know the setup is okay.



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[Rich]

I prefer a piece of fuel tubing on the inside end of the stuffing tube. It has worked on every boat I've built in the past ten years using it. My boats never have more than a few drops of water inside after a 2 minute race heat with the tubing in place. It does need to be squeezed a bit from a cable tie to just barely touch the flex cable or wire driveline.

Putting a piece of sponge or folded paper towel is okay if the "leak" is small. Several club members who can't solve their water problems do that. All it does is keep the water from sloshing around, but sometimes that can be enough to prevent a wet ESC or pack.



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Fluid, can I get a pic of what you are describing here?

[forescott]

I'm with chuck e. chese on this one. Stop the leak, any water coming up the shaft is gonna get flung all over and cause problems.

[OshkoshMono]

Turns well, but like all monos it will turn better to the right. Why only left turns in the video???

It's not running too wet considering the calm water. You can kick up the prop end of the strut a tad or move the CG back a little to loosen it up some, but then in rough water it may be too flighty. Try a P230 prop on that setup, it will run faster and shouldn't be too much - be sure to check temps often until you know the setup is okay.


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Ha, Ya I guess I did mainly left turns. Not sure why. I guess with only maybe 30 mins of total run time on this boat I didn't even think about it. The RPM is a bit low, but hopefully a good prop will improve performance enough that it won't matter so much. After this run, temps were only 70 deg on the motor! It was only 45 deg outside though, so the water was really cold. But I'd say that's some room for prop change eh?