thrust bearing.....what's your take?

[Luck as a Constant]

thrust bearing.....what's your take?

No. That would depend on your strut adjustment . Now , running a gap yesway. If you have your motor angled down in the front of the boat and your thrusting with the flex watch it go nose down.

Are you proposing that the motor angle will affect the ride of the boat?
I can see that


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[rearwheelin]

Yesway. Also the gyroscopic effect of the motor .

[kfxguy]

Motor angle affect what?

[rearwheelin]

Motor angle affect what?

Yeah think about it ! lol

[kfxguy]

Yeah think about it ! lol

I have. No matter what angle the motor is at, it not going to affect it. The prop shaft angle is what will affect it. Think about it. You could face the motor backwards. It's still going to do the same thing. The prop and shaft are pushing it straight ahead. All you need is something to stop the shaft from traveling to far in the boat if you will (collet/motor) and no matter what angle you have the motor at, your going to have forward thrust dependent upon prop angle.

[rearwheelin]

Very true.

[ray schrauwen]

You are pretty lucky to have one of his boats.

Ray,
You are correct. I have finally realized (admitted to myself) that I am not a hull builder at all. So I talked to Grim and asked if he knew anyone with a Rigger for sale. Happy to say he did and I bought one of Brian's. It was run 2014 at the Nat's and I am lucky for it to be in my home in Chicago, IL now. Plans are to run at Flint, MI this spring. I cannot wait until spring.
Mike

[tlandauer]

Would it be more or less correct for me to think in the following way?
As said from one of the posts, if the prop is pushing the boat, that kinetic energy is transferred through out the drive line. In a typical one piece flex cable where there is a gap between the drive dog and the stinger/strut, the forward thrust then is compressing the cable ( never mind the negligible shrinkage that everyone talks) , which in turn is transferred/relayed to the collet, motor shaft, bearing, endbell, finally to the motor mount which fortunately is secured to the floor and thus pushing the boat forward.
So, if we push a car from the rear, we push the bumper or the lid of the trunk, can't imagine we will open the driver's door and push( pull) the car by the head-rest on the seat. With this logic, the two piece shaft makes most senses because you can place a thrust bearing between the stinger/strut and the prop (or without it like TFL setups) and that would serve as the rear most point to push the boat.

In light of the usual set ups, since it is recognized that the cable does shrink, no matter how little it is, the torque that is causing the shrink is still greater than the pushing force that can compress the cable, and because of that, we don't have excessive cable whip.

[rearwheelin]

I have. No matter what angle the motor is at, it not going to affect it. The prop shaft angle is what will affect it. Think about it. You could face the motor backwards. It's still going to do the same thing. The prop and shaft are pushing it straight ahead. All you need is something to stop the shaft from traveling to far in the boat if you will (collet/motor) and no matter what angle you have the motor at, your going to have forward thrust dependent upon prop angle.

So the u bend stuffing tube going to the reverse motor is now the thrusting point which means it will push the boat at the apex of the bend . If your u bend is high up it will try to lift the bend if it's low it will push more evenly. A thrust bearing at the strut would eliminate any negative handling effect of a stuffing tube like this. Just saying !

[keithbradley]

Would it be more or less correct for me to think in the following way?
As said from one of the posts, if the prop is pushing the boat, that kinetic energy is transferred through out the drive line. In a typical one piece flex cable where there is a gap between the drive dog and the stinger/strut, the forward thrust then is compressing the cable ( never mind the negligible shrinkage that everyone talks) , which in turn is transferred/relayed to the collet, motor shaft, bearing, endbell, finally to the motor mount which fortunately is secured to the floor and thus pushing the boat forward.
So, if we push a car from the rear, we push the bumper or the lid of the trunk, can't imagine we will open the driver's door and push( pull) the car by the head-rest on the seat. With this logic, the two piece shaft makes most senses because you can place a thrust bearing between the stinger/strut and the prop (or without it like TFL setups) and that would serve as the rear most point to push the boat.

In light of the usual set ups, since it is recognized that the cable does shrink, no matter how little it is, the torque that is causing the shrink is still greater than the pushing force that can compress the cable, and because of that, we don't have excessive cable whip.

I usually push cars from the driver's door with the window down so I can steer. Otherwise you might run in to something.

[keithbradley]

yesway

Were you recently bitten by Dana?

[Luck as a Constant]

Were you recently bitten by Dana?

:yesway:

[keithbradley]

So the u bend stuffing tube going to the reverse motor is now the thrusting point which means it will push the boat at the apex of the bend . If your u bend is high up it will try to lift the bend if it's low it will push more evenly. A thrust bearing at the strut would eliminate any negative handling effect of a stuffing tube like this. Just saying !

I had to read this 10 times. I finally understand what you're saying. It's just not true. Don't draw an imaginary line from the prop to the motor, that is not how thrust vectoring works. Regardless of where the flex is contained and what angle it's at, the boat is being pushed relative to the axis of the prop hub, not the axis of the motor shaft or flex.

EDIT: By the way, your hypothesis would be correct if it were based on a solid shaft, because the "thrusting point" that you're imagining would be relative to the axis of the prop hub. With a flex, it's not.

[flraptor07]

I have. No matter what angle the motor is at, it not going to affect it. The prop shaft angle is what will affect it. Think about it. You could face the motor backwards. It's still going to do the same thing. The prop and shaft are pushing it straight ahead. All you need is something to stop the shaft from traveling to far in the boat if you will (collet/motor) and no matter what angle you have the motor at, your going to have forward thrust dependent upon prop angle.

Gyroscopic effect and torque does come into play slightly, I think that's where the motor angle thing came from..

[tlandauer]

I usually push cars from the driver's door with the window down so I can steer. Otherwise you might run in to something.

Now you tell me!! Hmmm, that explains all the lawsuits and insurance policy cancellations!