Quotes From The Net. Options

[Spudly]

Had me worried, My haines is a newer model, but my tank is nothing like that, the sender is on the back of the tank.

[Jumpus GooDarus]

Spud that boat has had it's floor up no Q about that nor is that a factory fitted sender
Some of those guys are bigger gooses than ewe no hu

[nimrod]

That guy was an utter goose frank

Mod1 did shoot me a friendly pm & i explained to him i refuse to let people get me angry & revert to taking the piss out of them to stay calm/level headed i'd rather be laughing than sulking

What gets me is all the worms who come out of the wood work when they think they've got me

That red guy is an utter twit the only time you'll ever see him rear his head is to have a go @ someone.

Dont worry if you follow the other threads you get a good idea most of the other guys dont get involved sit back & have a laugh @ what i post

Jumpy I will tell you something about that red guy but it would have to be done in PM, if you want to hear it.

[Jumpus GooDarus]

Good guess he's got 2 user names

Comes out as red when he wants to bitch

[nimrod]

Good guess he's got 2 user names

Comes out as red when he wants to bitch

No only the one user name, you're probably not interested but i will tell you anyway.

[Spudly]

No only the one user name, you're probably not interested but i will tell you anyway.

Tell me! hahaha

[Fed]

Tell me too! HaHaHa

[Fed]

My haines is a newer model, but my tank is nothing like that, the sender is on the back of the tank.

Never seen one mounted on the side rumpus I think it's about time you did a thread on the boat with plenty of pics.

[Jumpus GooDarus]

This quote was a classic

Leaves the gumballs quote for dead guess who said it & what it's refering to

I want Rocket Jumpers for the boat

[Fed]

Here we go again, picture showed a trim tab turned to the right.

You've posted a clear photo of your tab and the way it is pointed will do two things:
1: Looking at the prop and tab as you photographed it, think of the water coming past the tab towards you, it will hit the right side of the tab and want to turn the bow to the right, so you may have to turn the steering to the left to counteract that.
The test is, when you're underway, let go of the steering wheel and if the boat tracks right, the back of the tab, as you look at it, has to be turned to the left. Make slight adjustments until it tracks straight.


2: Because the tab is below the C of G of the boat mass, the water hitting the right side of the tab will roll the hull clock-wise or to starboard.
The more it's straightened, the less affect it will have on lean.
Thrillseeker

It only goes to prove that these posters HAVE NEVER DONE IT THEMSELVES.

[Fed]

Who wants the rocket jumpers, you must be getting under someone's skin.

[Jumpus GooDarus]

They've got no idea @ all Fed

Then they want to have a go @ me for trying to set the record straight

It's all they know trim tab anode 90% of them wouldn't have a clue on how to drive/trim out a motor/'s to settle a boat so it's driving true

Not all boats are built with same degree angle on transom where motor gets bolted to hell i even had to go 8 degree wedges on mini me to get it runing trurer.

Since gone with last mods

[Fed]

Nothing wrong with adjusting the anode but you'd think they would know which direction to adjust it.
They all seem to think the anode is a rudder for some reason.

I think they're all losing touch because of the NFB & higher ratio hydraulic steering.

[Fed]

Finally some sanity, let's see how many of the wankers eat some humble pie now.

I will say it one more time, the tab steers the MOTOR, not the boat, it does NOT act like a rudder as such on the boat, it steers the motor, that in turn steers the boat, you need to be very clear about that, or you will adjust it oposite to what you think.
Noelm1

[Spudly]

As far as i have understood the trim tab is only to counteract the turn of the prob which trys to turn the motor one way making the steering turn one way easier and the other harder. Its equalizes this by putting a small amount of turn on the motor to make the steering balanced.

[Fed]

The prop has nothing to do with it Rumpus, it's the engine block trying to turn in the opposite direction to the crankshaft.

Go & give your car a small rev while it's in gear with your foot on the brake and watch the engine block try & turn in the engine bay, same thing.

If I give my outboard a rev on the flusher my motor immediately flicks to the right and the prop is not even in the water.

Another point to ponder, twins running one counter rotating gearbox & prop.
They do not cancel each other out because the engines are not counter rotating so they will both still try to turn to the right.

Now if one of the actual engines was a counter rotator then they would cancel each other out completely.

And then there's trim which is a whole new ball game when you consider the attack angle of the prop blades in a negative trimmed or positive trimmed situation.
The moment the prop shaft is not running parallel to the water surface a steering pressure is exerted by the unbalanced blade attack angle from port to starboard.
All of this gets back to people using their trim to counteract a forward/aft weight distribution problem, I see it all the time.

I think a lot of these guys posting have never had cable steering so the NFB hydraulic c/w higher steering ratios is masking what their boats are actually doing.

They should run their boats with a temporary tiller steer to get it set up then connect their hydraulic steering feeling confident if they ever blow a hydraulic hose the boat won't do an instant U turn and chuck them in the water.

[Spudly]

Disagree Fed.... Often Counter rotators will have straight tabs as they dont need them, a car engine jumps because of the weight of the flywheel spinning.. Thats why cars have flywheels to provide that turn. If the case was that the motor was trying to turn the boat then it would have not as great effect on the lean as the prop turning would as the prop is trying to spin the boat sideways, just like a drill spears off if you dont have a pilot hole..

"Torque trim tabs help to counteract the effects of torque, or wheel-walk, on the vector of the boat. Wheel-walk is a phenomenon that is created by differing water pressure at the top and the bottom of the propeller. As the propeller rotates through the water, the pressure at the bottom of the propeller is greater than the pressure at the top. This creates greater drag at the bottom than at the top and makes the propeller try to "walk" sideways through the water.

This makes a right-handed prop (clockwise rotation) move laterally through the water, and makes the stern of the boat swing to the right, making the boat turn to the left when underway. Counter-steering with the helm will not correct this and will only succeed in making the entire boat move at an oblique angle to the direction that the bow is pointing."

[Spudly]

ust thought, another example of this is when docking a boat... Coming into a wharf at a diagonal and then hiting reverse will bring the stern of the boat into the wharf if you come in the right way, if you come in the wrong way it will move the stern away from the wharf.. In a Clockwise rotating prop you want to approach a wharf with the starb. side closer and then when you hit reverse the boat should skew into position.

[Fed]

Disagree Fed

Then we'll have to agree to disagree Rumpus.

Often Counter rotators will have straight tabs as they dont need them

Just because people don't know how it works doesn't make it right unless you're talking about counter rotating engines and then I agree they will cancel each other out.

a car engine jumps because of the weight of the flywheel spinning.

The block of a car engine will try and spin in the reverse direction to the crankshaft.
Same as an outboard motor will try & spin in the reverse direction to the crankshaft, OMC even have a built in bias in the trim tab so that when you set it straight it's already got it's trailing edge pointed towards the starboard side.

If the case was that the motor was trying to turn the boat then it would have not as great effect on the lean as the prop turning would as the prop is trying to spin the boat sideways, just like a drill spears off if you dont have a pilot hole..

I have no idea what you are trying to say there mate so I'll put that down as jibberjabber for now.

"Torque trim tabs help to counteract the effects of torque, or wheel-walk, on the vector of the boat. Wheel-walk is a phenomenon that is created by differing water pressure at the top and the bottom of the propeller. As the propeller rotates through the water, the pressure at the bottom of the propeller is greater than the pressure at the top. This creates greater drag at the bottom than at the top and makes the propeller try to "walk" sideways through the water.

This is an interesting point you've brought up Rumpus and I think most people are aware that if you're pulling up at a wharf (say 45 degrees on starboard side) and hit reverse with a clockwise prop the boat will skew sideways but tell me this, with higher water pressure on the bottom of the prop & the prop going in reverse why doesn't it skew the back of the boat to the port?

This makes a right-handed prop (clockwise rotation) move laterally through the water, and makes the stern of the boat swing to the right, making the boat turn to the left when underway. Counter-steering with the helm will not correct this and will only succeed in making the entire boat move at an oblique angle to the direction that the bow is pointing."

Same as my answer above but reverse the observation to allow for the boat being underway.
I don't dispute the paddle wheel effect at all but you'd think a clockwise rotating prop would walk to the right while underway. I personally believe that effect is so small it's hardly worth mentioning in the context of the discussion.

I'm sticking with the function of the trim tab to counteract the engine torque, the beauty of doing it this way is that the correction is done with water pressure on the tab and being an external force none of this load is transmitted into the hull through the steering and that it's self regulating, as the HP increases so does the speed & so does the pressure on the trim tab.

In a Clockwise rotating prop you want to approach a wharf with the starb. side closer and then when you hit reverse the boat should skew into position.

How do you explain that when the higher water pressure is at the bottom of the prop, the prop is spinning anti clockwise therefore the back of the boat should move to the port.

Interesting shit eh?

This post has been edited by Fed: Jan 9 2012, 11:04 PM

[Spudly]

Damn, do you have to write so much, its hard to reply to it all...

Same as an outboard motor will try & spin in the reverse direction to the crankshaft, OMC even have a built in bias in the trim tab so that when you set it straight it's already got it's trailing edge pointed towards the starboard side.

Most trim tabs have this bias (i assume you mean a concave in the tab) for counters the concave faces the opposite way, if you have twin counters you can get straight ones with no bias. with twins you have much more control over the whole boat also.

This is an interesting point you've brought up Rumpus and I think most people are aware that if you're pulling up at a wharf (say 45 degrees on starboard side) and hit reverse with a clockwise prop the boat will skew sideways but tell me this, with higher water pressure on the bottom of the prop & the prop going in reverse why doesn't it skew the back of the boat to the port?

Was refering more to a boat at speed in this post.

The block of a car engine will try and spin in the reverse direction to the crankshaft.

The engine is balanced, its only the initial burst of torque that turns the engine, then it will balance and sit in its operating position, so by what your saying here is that the boat will only require a trim tab when you are increaseing the revs of the motor, not at a fixed rpm which is incorrect, the probelm exists at fixed speeds and therefore must come down to prop torque not engine torque??

EDIT; Im still thinking bout this but biit sunburnt and sore so will have to get back to this....