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-   -   Thinking out loud: Variable pitch prop (http://www.wakeworld.com/forum/showthread.php?t=798385)

06-01-2013 10:57 PM

Thinking out loud: Variable pitch prop
 
Im surprised that no company has designed a variable pitch prop for a wake boat. Just think of the benefits of that. It would almost be like shifting in a car but it would be smooth and unnoticeable. it probably would require a different shaft support but It could work like a cable actuated diff lock in a car. Im sure their really wouldn't be a market for a setup like that but with all this new technology, i wouldn't be surprised it it did.

alexair 06-01-2013 11:30 PM

very very difficult to have no vibration

jrw160 06-01-2013 11:40 PM

When did MB stop offering 2 speed transmissions in their boats? Seems like a 2 speed transmission would be a better option.

06-01-2013 11:50 PM

Were they autos or manuals? I never knew they offered that. It would definitely be nice to run a crazy pitch prop for low and have your top end also.

robertstone9 06-02-2013 6:58 PM

it's been done on outboards not sure about inboards http://www.torqueshift.aeromarine.com/

lfadam 06-02-2013 7:02 PM

They do it for airplane propellers...don't see why it couldn't be done in boats.

I still don't get why boats don't have gears like cars. It seems ridiculous that we are stuffing these huge engines into boats because we are basically running them only in first gear. If cars didnt have gears, think about what kind of engines we would be putting in there. I understand the drag of water may present challenges when shifting, but I feel like it shouldn't be that difficult. (And I heard pretty good things about the MB 2 speed...?)

rdlangston13 06-02-2013 8:03 PM

you could use a CVT to avoiding having to shift

beretta5spd 06-02-2013 8:19 PM

We had a Larson with a variable pitch prop. It was finicky and needed lots of attention to run properly. I heard the company went bankrupt because of warranty issues. It truly did feel like a 1-2 shift in a car. I think ours was a 15-21 pitch.

nitrousbird 06-03-2013 7:22 AM

Quote:

Originally Posted by rdlangston13 (Post 1825201)
you could use a CVT to avoiding having to shift

Have you seen the little motors they put behind these CVT's? Even your weakest 80's ski boat puts out a lot more torque than any of these CVT cars. They are normally put behind N/A 4 and 6 cylinder vehicles. A boat would shred one quickly.

boardman74 06-03-2013 8:28 AM

CVT is just a fancy twin clutch set up like in a snowmobile or automatic four wheeler. In high horse power(200+ hp drag sleds, etc.) applications is not the clutch's that shred it's the belts. I think the cars are running a chain versus a belt to join the primary clutch to the secondary(variator). So the belt or chain is the weak point, not the clutches. What shreds them in snowmobiles is when you have a ton of studs in the track and everything hooks up really well traction wise. So with the slippage of a prop in water that would never be an issue. So it might actually work really well even with higher hp. I think mounting might be an issue as they do not work inline. Thats why you only see them in front wheel drive with transverse mounted engines.

sppeders 06-03-2013 1:04 PM

How about a hydrostatic transmition.... or.....

a Diesel!!!

phillywakeboarder 06-03-2013 1:46 PM

I think manufacturers should just concentrate on making boats heavier and adding more touchscreens. I don't feel like I burn enough gas and I'm sick of having to bring my iPad on the boat.

skiboarder 06-03-2013 2:02 PM

Eric--I love that post.


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