Turning props inward...faster?
#1
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Joined: Mar 2003
Posts: 2,497
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From: PA/MD
Sorry, I am sure this has been addressed many times but the search on the site never seems to find what I am looking for.
I am just wondering if turning props inward instead of out on a twin engine setup really changes anything. I have heard it is harder to dock but will be faster running at speed.
Is this true? Also, is the boat any harder to control at any point besides at the dock if this is true?
I am just wondering if turning props inward instead of out on a twin engine setup really changes anything. I have heard it is harder to dock but will be faster running at speed.
Is this true? Also, is the boat any harder to control at any point besides at the dock if this is true?
#2
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Joined: Oct 2012
Posts: 464
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From: Grosse Pointe Woods, Mi
I have done it on a non stepped 10 meter fountain. Picked up a couple miles per hour but the handling was terrible. Boat was all over the place. It all depends on the hull design. Maybe I could have played with props to overcome this, but didnt feel it was worth it. Was running lab finished and cut 24 mirage props.
#3
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Joined: Mar 2002
Posts: 2,142
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From: Miami Beach
every boat is different and will respond differently to the change, the props you have also affect the outcome. Best thing to do is try it. I didn't gain any speed but I did get slightly better MPG at cruise spinning in. Docking is not an issue for me, boat leans more in turns but other than that handles pretty much the same, but also my boat is slow only goes 55 mph.
#4
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My 33' boat was set up by the previous owner with inward rotation props. First big wake I ran across with it handling and stability was worse than my 23.5 footer. Talked to Bobby S about it he said it should be outward rotation (which I had figured based on some research). Swapped it to outward readjusted the toe, slowed it down a bit but eliminated the ill handling most often to the point of not noticing a wave, wake or washing machine conditions. I perfer the handling over 2 to 5 MPH anyday sure my passengers unknowingly did also.
Some hulls are designed for inward rotation and come that way from the builder. Someone may correct me here but research led me to believe cat hulls were more apted to have inward rotation suggest contacting the builder for info on a particular hull.
Some hulls are designed for inward rotation and come that way from the builder. Someone may correct me here but research led me to believe cat hulls were more apted to have inward rotation suggest contacting the builder for info on a particular hull.
Last edited by turbo2256b; 11-13-2013 at 11:08 AM.
#5
Pending the prop and the boat, it could very well affect transom lift or bow lift. This could create potentially negative affects in a step bottom boat.
Last edited by Sydwayz; 11-13-2013 at 11:35 AM.
#7
Call me anytime and I can explain the physics.
We can discuss the actual boats personality and your goals and come to a best outcome.
Every identical boat is different and there are secrets to getting where you want to end up.
Brett
We can discuss the actual boats personality and your goals and come to a best outcome.
Every identical boat is different and there are secrets to getting where you want to end up.
Brett
__________________
Brett Anderson / BBLADES Professional Propellers
920-295-4435 http://www.bblades.com/
[email protected]
Brett Anderson / BBLADES Professional Propellers
920-295-4435 http://www.bblades.com/
[email protected]
#8
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Joined: Jul 2004
Posts: 11,332
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From: chicago
I turn mine in on my straight bottom Fountain. No ill handling. Docking is a bit tricky in reverse. Tried turning out, boat ran "wet" and flat. Didn't care for it. Like they said, every boat is different.



