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I've been using the black moly grease used in automotive CV joints for 3 years now. Between that and using the Speedmaster floating bushings I have had no shaft failures nor any visible wear. It's not as thick (less drag) as say the Grim grease but I'll bet the film and shear strength is at least as good. CV joints require the best lube available to be reliable due to the high pressures created as they work. My 2 cents. I suspect, though, that almost any good quality grease with some water resistance will do the job in a properly set up shaft/tube if it is serviced often enough.
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Fast Electrics Have A Small Carbon Wake
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John, you guys crack my A$$ up!!! You must be staying up all night to come up with galvanic corrosion problems in a FE boat. Unless of course, you store it floating in a lake (put zinc bars on it if you do).
If you remove the flexshaft and put your choice of lube on it after a day of running (you should), you don't need to be concerned about corrosion issues.
JIM
No disagreement here, but I'm pretty sure the original poster wants to be able to avoid removing the flex cable at all, and just lubricate it from a fitting. I've seen a similar post over on rcgroups (not sure if it was the same guy). I don't know what his setup is, but he made it sound like it was too much trouble to remove, wipe and grease the flex on his boat.
Again, I agree that removing them and lubricating them after a days running is ideal, I just don't think the OP was up for that much, umm... "trouble"...?Comment
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That was probably me:
As you can see, there are people that have set their systems up to not have to remove their drive system after every run to lube it. Bearing at the rear sounds like an ideal solution to me. Less vibration at the prop, less friction, more grease/lube retained in the stuffing tube.Comment
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I use ball bearings in some of my struts on the micro boats, you get less friction. I use 3 ball bearings on the stub, 1 at the front of the strut & 2 back to back at the rear to take the side load put on the rear bearings. Having 3 sealed ball bearings in the strut also keeps water out + keeps grease in, when i take the shafts out theirs no water on the shaft only grease.Comment
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A lot depends on your tube to flex clearance, 3/16 flex to 1/4 tube has about .030 clearance, for that I run 75-90W synthetic EP (Extreme Pressure) Rear End lube and add STP at 4 oz rear end + 2 oz. STP applied with a pump oil can slowly thru the oil line in the boat. Greases have soap in them, that is the white foam you see on the prop end of the cable when you remove the flex. Thank You Jay Turner, no water inside or rust.Comment
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In my case, you still need something at that end to prevent stuff from flapping around in the stuffing tube.Comment
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