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03-26-2013, 12:29 PM | #1 |
Like Gixxxxer But Not
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What is pitch for a Prop...Like gearing for a car/bike?
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03-26-2013, 12:34 PM | #2 |
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Exactly. Hole shot vs top speed
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03-26-2013, 12:38 PM | #3 |
Like Gixxxxer But Not
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Got ya.
Makes sense. Just never got into Boats much
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03-26-2013, 03:49 PM | #4 |
SFL Expatriate #1
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Location: ATL Burbs
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Pitch is how far it will travel forward in one complete rotation, in inches. So I went from 19" to 17", with the objective being to get more spin in a same linear distance, thus providing more thrust powering up from an idle, to ease in pulling a skier/wakeboarder up out of the water faster. Hope I'm explaining it correctly, this stuff is relatively new to me.
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03-26-2013, 04:22 PM | #5 | |
Ride Like an Asshole
Join Date: Feb 2008
Moto: nothing...
Posts: 11,254
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Quote:
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03-27-2013, 06:59 PM | #6 | |
SFL Expatriate #2
Join Date: Nov 2008
Location: Raleigh, NC
Moto: CBR1000
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Quote:
I assume there are some fluid dynamics that come into play similar to HP and Torque, I'm just having trouble visualizing which pitch favors which. |
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03-27-2013, 07:28 PM | #7 | |
restorer of the original
Join Date: Mar 2008
Location: Zionsville,PA
Moto: '93 ZR1100 &'73 Kawasaki H1 500
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Quote:
On my 4.3L powered 18' Celebrity, I added a "whale tail" to the lower unit. At the expense of about 2 mph on top end, I get much better hole shots ( made a BIG difference pulling water skiers) and increased stabilty in rough water ( less rocking) |
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03-28-2013, 12:19 AM | #8 | |
AMA Supersport
Join Date: Feb 2009
Posts: 4,756
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Quote:
To compare it to something you are more familiar with look at motorcycles. Using the same logic 6th gear (19") would give better acceleration and top speed than 1st (17") since 6th gives more forward motion per rotation than 1st. For essentially the same reasons as a boat accelerating the mass of the bike and overcoming friction means this is not the case. |
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03-28-2013, 10:11 AM | #9 |
Movie Star
Join Date: Feb 2011
Location: Kingsport, TN.
Moto: KLR650
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Then of course, you have to walk the fine line between thrust and cavitation! Too shallow a pitch and the prop will rip through the water and not gain any forward traction for the force applied. It's like everything else, it's a trade-off between holeshot and top speed. As previously mentioned, whale-tails make a huge difference in holeshot at the expense of top-end. They also help make slightly smoother wake for wakeboarders and the like.
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03-26-2013, 01:04 PM | #10 |
Viff6N Mutated Warrior
Join Date: Mar 2009
Location: Texas
Moto: '01 Honda VFR 800 & '09 ER-6N
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Pitch doesnt matter much when youre hitting stumps and boulders. LOL. Are lakes are ponds now.
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