TAMIYA Thrust Ball Bearing

[Alfa Spirit]

I want to use this one piece Thrust Ball Bearing between 2 teflon washers in front of the propeller.

Size is perferct 5mm x 11mm x 4mm.

The two external parts and balls make one piece perfectly adjusted and very strong

[Prodrvr]

A thrust bearing goes between the collet and motor mount.

[Alfa Spirit]

A thrust bearing goes between the collet and motor mount.

Sometimes, yes

[NativePaul]

Why the Teflon washers if you are using a thrust bearing? Is the brass part recessed behind the races faces,or will you have to concave the drive dog and strut slightly tomato sure it doesn't touch there?

[T.S.Davis]

A 5mm stub shaft? Where would you find a prop for that?

I use that bearing on every spec boat but at the motor face. They do work well.

[RaceMechaniX]

You can use these on the strut end, but you will have to find a thin tube shim to center the 5mm thrust bearing on a 3/16" shaft.

[T.S.Davis]

Probably depends on the strut too. You don't want a thrust bearing or a washer that's bigger around than the strut.

[CraigP]

It’s really important where the boat is being pushed at. Typically, it is not a good thing to push a boat from the strut or back. Ideally, pushing at the COG is the best and that’s why the thrust bearing is mostly mounted between the shaft coupler and the front motor face. Those thrust bearings won’t hold up to water lubrication for long. I have all my boats running this bearing at the motor. The proper spacing on the strut to prop hub is also important. The no-brainer, don’t want to worry about it spacing is the diameter of the flex shaft. I run it about 75% of that number. Some flex shafts wind up more than others, you got to learn that. I used the graphite washers at first in the space, then when I could see witness marks of it hitting gave me a good number.

[ray schrauwen]

Some H&M stubs are 5mm step down to 3/16".

[Alfa Spirit]

Typically, it is not a good thing to push a boat from the strut or back. Ideally, pushing at the COG is the best and that’s why the thrust bearing is mostly mounted between the shaft coupler and the front motor face

Are you serious ???

Pushing at the COG your boat will want to go Under the water ...

[akula]

Are you serious ???

Pushing at the COG your boat will want to go Under the water ...

Alain, my friend

The thrust on the COG of your boat will only have the effect of dropping it from its shelf ... LOL
Did you at least drill a hole in the hull ?? I don't think so...

cheers

[Prodrvr]

Thrust bearings go between the collet and motor mount to save the motor bearings because they aren't designed for lateral loads. I've never seen a thrust bearing placed between the strut and prop. And what's up with pushing the boat at the CG? What?? WTH is that about? LOLOL

[CraigP]

I’m talking about hydros... Go under water? Serious drugs are being used here. Do any of you ever think that any racing hydro with an inboard engine are pushed from the back? We go to great lengths to design thrust packages in racing hydros to get the push as close to the CG as possible. Huge effects in turning stability! Whether RC or full scale, the force vector diagram is the same.

[Prodrvr]

The OP is talking about using a thrust bearing...where did hydros come into the discussion?

[sammyha]

I’m talking about hydros... Go under water? Serious drugs are being used here. Do any of you ever think that any racing hydro with an inboard engine are pushed from the back? We go to great lengths to design thrust packages in racing hydros to get the push as close to the CG as possible. Huge effects in turning stability! Whether RC or full scale, the force vector diagram is the same.

Serious question. I want to learn. If it pushes close to the cg, behind the motor, then why does strut angle matter? It would be pushing thru the flex cable and at an angle up to the motor, if what you're saying is true. Then it would push the bow down, right?

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