Gear Ratio Debate 1.62 vs 1.75

[davemvegas]

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.

Take it how you want to. I get pissed when i post to tell someone my actual experience to guide the poster who ask a question. This 1.62 vs 1.75 is issue i have experience with. Then the keyboard engineers start in. Then it gets to trying to use a example that maybe the people that refuse to to believe that my answer is not guessing the difference of 1.62 vs 1.75. my answer is from trying it over and over on a few different boats. Then i get the typical YOU type. That seem to think they are the internet police to my attitude. I am old and have a bad attitude. Not any chance that you are going to fix it. There is a ignore feature that you can use to never see any of my post or comments. Use it if that will put you at ease.

[Merc 2.5]

Take it how you want to. I get pissed when i post to tell someone my actual experience to guide the poster who ask a question. This 1.62 vs 1.75 is issue i have experience with. Then the keyboard engineers start in. Then it gets to trying to use a example that maybe the people that refuse to to believe that my answer is not guessing the difference of 1.62 vs 1.75. my answer is from trying it over and over on a few different boats. Then i get the typical YOU type. That seem to think they are the internet police to my attitude. I am old and have a bad attitude. Not any chance that you are going to fix it. There is a ignore feature that you can use to never see any of my post or comments. Use it if that will put you at ease.

Thanks for the advice. I will ignore ur pissy ass post. Wouldn't have this prob if u wasnt just a PRICK. My
.02. So what's your excuse for the other threads. This is all **** u can type and think u big bad ass. I'd love see you say sum **** lik to the the faces of these people. I'm no key board police. Just dont like your bull**** drama on this boating site. Keep drama for your Facebook or sumthin. Out.

[FMP]

So what about the props, a slower turning high pitch vs a faster turning lower pitch, same engine rpm, same travel distance. More shorter steps vs fewer longer steps to achieve the same distance, buried and surface running, light vs heavy hull load, same hull , pad or v or tunnel? Different ratio match to props pitch as usual to achieve same travel on paper.

[Captaincj]

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.

Here's your chance to give him what he wants to know!

Kidding, of course.

[davemvegas]

Thanks for the advice. I will ignore ur pissy ass post. Wouldn't have this prob if u wasnt just a PRICK. My
.02. So what's your excuse for the other threads. This is all **** u can type and think u big bad ass. I'd love see you say sum **** lik to the the faces of these people. I'm no key board police. Just dont like your bull**** drama on this boating site. Keep drama for your Facebook or sumthin. Out.

I know you did not hit ignore. you to weak to walk away. Did you ever hear the saying... Don't throw rock in a glass house? Or pot calling the kettle black?

[rude tim]

This is all I have to say on this matter from now on. WHAT HAS A CARS THIRD MEMBER GEAR RATIO AND TIRE SIZE GOT TO DO WITH THE ORIGINAL QUESTION??????? Again I say Its like trying to compare apples to pomegranates. The two cant be compared at all. Running on H2O vs asphalt, Drag Coefficient etc??? A TFH has achieved a 3.43/274.92 mph pass while a TF Dragster has achieved a 3.8/336.15 mph. Both in 1000 ft. Break that one down for me fellow engineers

put the starting lights at the rope and the difference will be even grater. TFH get a good run at the lights.

[engineermike]

.... I am out of here.

I know you did not hit ignore. you to weak to walk away. ....

hmmm...

Or pot calling the kettle black?

[davemvegas]

hmmm...

Yes. I am weak. I tried to stay away. I came crawling back to keyboard.

[FORBESAUTO]

Let’s get back on track here, about the topic at hand. 1st want to say I respect all you guys input. Let’s take the info that has been given to us and try to get a logical conclusion. We got a few guys saying gears is the bomb, these fellas where coming from mid 20 pitch props to upper 20 pitch props. Got a few guys saying don’t make a hill a beans, if I had to guess these guys starting out upper 20 pitch props going to low 30 pitch props being test where on Allison’s and such. This tends to make me believe the efficiency of upper 20 pitch props are far superior as Joe mentioned also. So probably correct answer is gear to run these pitch’s whether it’s up or down?

[HStream1]

That cant be debated until it happens and the TFH changes the Tune to accommodate.

put the starting lights at the rope and the difference will be even grater. TFH get a good run at the lights.

[FMP]

Would only drop your average speed

[LakeFever]

Let’s get back on track here, about the topic at hand. 1st want to say I respect all you guys input. Let’s take the info that has been given to us and try to get a logical conclusion. We got a few guys saying gears is the bomb, these fellas where coming from mid 20 pitch props to upper 20 pitch props. Got a few guys saying don’t make a hill a beans, if I had to guess these guys starting out upper 20 pitch props going to low 30 pitch props being test where on Allison’s and such. This tends to make me believe the efficiency of upper 20 pitch props are far superior as Joe mentioned also. So probably correct answer is gear to run these pitch’s whether it’s up or down?

Thats pretty much how I see it. The secret sauce is in the prop which I can surely appreciate is very hull dependent and the gear ratio is used to dial in the sweet spot so the sauce dont sour, so to speak

[Double Rigged]

Just to add .02 cents to this crazy discussion and owning two sets of lower units and countless hours of testing Davemvegas is spot on in what he is saying. In theory things look like you can adjust with just pitch of the propellor and things will be the same. I can tell you that is not the case. Depending on what you are looking for their are multiple combinations that can give you an edge over the rest. They are not huge gains but that is what allows one boat to out run the other even it is only a few MPH.
Have fun testing and see what works for you. That is what makes this so much fun and a challenge.

[LakeFever]

Just to add .02 cents to this crazy discussion and owning two sets of lower units and countless hours of testing Davemvegas is spot on in what he is saying. In theory things look like you can adjust with just pitch of the propellor and things will be the same. I can tell you that is not the case. Depending on what you are looking for their are multiple combinations that can give you an edge over the rest. They are not huge gains but that is what allows one boat to out run the other even it is only a few MPH.
Have fun testing and see what works for you. That is what makes this so much fun and a challenge.

Thats because the prop was better suited to the performance, not the gear ratio. The gear ratio required to allow the better performing prop do its work is one of the tools used to provide the better performing prop with more favorable conditions to tame chaos. If one ratio vs another comes out on top if I was racing? I would spend a lot of time looking at the differences between the two props and ask why? There are gains in there somewhere, something to learn.

Interesting how this dynamic can be viewed rationally from both sides of the coin though.

[Captaincj]

Thats because the prop was better suited to the performance, not the gear ratio. The gear ratio required to allow the better performing prop do its work is one of the tools used to provide the better performing prop with more favorable conditions to tame chaos. If one ratio vs another comes out on top if I was racing? I would spend a lot of time looking at the differences between the two props and ask why? There are gains in there somewhere, something to learn.

Interesting how this dynamic can be viewed rationally from both sides of the coin though.

I believe that when operating somewhere within the *intersection* of the *optimal efficiency spectrum* of the hull (at speed), the prop (at speed) and the engine (in its powerband) that the gear-ratio differences can be neutralized with prop pitch changes (holding prop slip, efficiency equal, in theory). But, boats don’t always operate in that narrow intersection of hull, engine and prop efficiency!

I believe that the lower gear ratios have a distinct advantage in the transition from idle to planing especially. When you begin to spin the prop up to plane the boat, it’s mostly prop slip on these lightweight performance hulls. When you bury the throttle to get the boat on plane you are winding the prop up (winding up a heavy 14-17 inch stainless steel prop through a very dense liquid) through a period of heavy drag and heavy slip, where in my opinion the torque from the lower gears has a distinct advantage.