Gear Ratio Debate 1.62 vs 1.75

[FMP]

Then someone rings the dinner bell and it's over till the next day

[Captaincj]

ratio changes affect torque applied to the prop, that effects the diameter you can run due to tip speed, which will force a change to the blade shape, which then comes to do I have enough blade to move the boat with the slip that that prop works best with?
But first you check the air density so you know how much compression to run that day hence now calculate your peak torque then get your custom ratio built while the prop guy is making you todays prop and you pick a gearcase height by throwing darts at a board unless you are sure you know the wave height for the whole race.
The you find out the crew re profiled the gearcase so nobody knows how much lift it will have so the prop guy is throwing darts at the board trying to work out how much rake you need.
Then you find out the fuel density is way off normal so you might not have enough fuel capacity on board , so you shift the fuel tank forward to fix the CoG.
Hopefully you will still get on the plane.
Get all that right and you will be on a podium every time.

Powerabout for the WIN!

[Captaincj]

I do agree that a lower gear ratio will have an easier time spinning up the prop and getting a boat on plane.

[FMP]

Unless it's over propped, ....what too soon!

[Captaincj]

There's a $marta$$ in every group FMP, usually it's me.

[engineermike]

...This really got away from itself....

In all fairness, you put the word "debate" right there in the thread title. You got what you asked for....

[powerabout]

did we mention the water density, fresh to tropical salt to cold salty water in the north?

[Captaincj]

did we mention the water density, fresh to tropical salt to cold salty water in the north?

Yes, but we haven’t covered oceanic circulation currents or the gravitational vortex of the Bermuda Triangle.

[HStream1]

Actually he didnt get what he asked for. with the exception of a few members. He got exactly the opposite. The Original topic was to debate the two different gear ratios if propped properly 1.62 vs 1.75 in the General Boating Discussion Forum.. Then all of a sudden people started Chiming in completely off topic. Car rear end Gear ratios, Tire sizes etc. Never saw a Boat with Tires and never heard of a car having a 1.62 or 1.75 gear ratio.

In all fairness, you put the word "debate" right there in the thread title. You got what you asked for....

[FORBESAUTO]

Exactly, not sure why we even went down the road of if using exact same prop with exact same 0% slip (which ain’t possible and changes depending on how fast it spinning for each prop, which is probably one of the variables that changed acceleration) there would be no change. He said said if propped correctly. He should at least be able to run about the same speed, with a possibility of going a little slower or even a little faster depending on efficiency of prop. In my situation I feel the props in the 27-29 pitch range are just more efficient than the 24-25 pitch props I was running before, allowing me to run a higher top end. Plus seems I had more options in go fast props in that range. My 27 prop is faster than my 29 for whatever reason, could be the prop guy, just not as good of metal, whatever. But whether he looses a tad bit of speed or gains a tad, I can promise him he like driving/ running to boat with the lower gears because of the improved hole shot. Ain’t really one way to find out, and it’s try it. Ain’t nothin but money lol

[HStream1]

Some of what you said here is exactly why I suggested he swap props from boat to boat and see if the speed difference follows.

Exactly, not sure why we even went down the road of if using exact same prop with exact same 0% slip (which ain’t possible and changes depending on how fast it spinning for each prop, which is probably one of the variables that changed acceleration) there would be no change. He said said if propped correctly. He should at least be able to run about the same speed, with a possibility of going a little slower or even a little faster depending on efficiency of prop. In my situation I feel the props in the 27-29 pitch range are just more efficient than the 24-25 pitch props I was running before, allowing me to run a higher top end. Plus seems I had more options in go fast props in that range. My 27 prop is faster than my 29 for whatever reason, could be the prop guy, just not as good of metal, whatever. But whether he looses a tad bit of speed or gains a tad, I can promise him he like driving/ running to boat with the lower gears because of the improved hole shot. Ain’t really one way to find out, and it’s try it. Ain’t nothin but money lol

[davemvegas]

Actually he didnt get what he asked for. with the exception of a few members. He got exactly the opposite. The Original topic was to debate the two different gear ratios if propped properly 1.62 vs 1.75 in the General Boating Discussion Forum.. Then all of a sudden people started Chiming in completely off topic. Car rear end Gear ratios, Tire sizes etc. Never saw a Boat with Tires and never heard of a car having a 1.62 or 1.75 gear ratio.

Just trying to dumb it down with car theory for a couple of you asshats that cant stick your finger up your ass with both hands.

[HStream1]

And Like I said more than once trying to Compare a Cars dynamics to a Boats when the Drag Coefficient if totally different, Horse power to weight ratio etc etc etc etc etc etc is like trying to compare Apples to Pamagranets. So with that being said. Ill say this!!! its some of the jack asses thats posted on here off topic that has caused me over the years to not frequent this site like I used to. And Im not the only one that feels this way. Its WAY deeper than just myself or a few. Its MANY.

Just trying to dumb it down with car theory for a couple of you asshats that cant stick your finger up your ass with both hands.

[Merc 2.5]

Just trying to dumb it down with car theory for a couple of you asshats that cant stick your finger up your ass with both hands.

May be none of my business but this is the 2nd or 3rd thread I've seen u talking **** and trying to put people down. Keep drama so.ewhere else.

[FMP]

I just can't stand it anymore, everybody group hug....ahhhhh