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  #1  
Old 12-18-2016, 10:35 AM
PAUL-EYE PAUL-EYE is offline
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Default 1875 impact sport top speed

Hi everyone I have a 2016 Lund impact sport with a mercury 150 fourstroke. I really want to increase top speed. I run 48-49 downstream and 45-46 upstream. I currently have the tempest plus 19p prop. Not complaining at all about boat performance or motor performance. I love my merc! I just want some feedback from other impact owners. I used the merc prop selector and it recommended the Enertia. Any feed back would be appreciated thanks.
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  #2  
Old 12-18-2016, 11:03 AM
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jeffbilodeau jeffbilodeau is offline
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I had one with a 150 Verado and the best I ever got was 50 mph gps. You could try a higher pitched prop but a 21 is going to suck on hole shot. Haven't heard of anyone Honestly I would leave well enough alone because if you really want significantly more speed you are going to spend a lot of money with very little result. At best you might squeeze another 2 mph with the perfect prop but that will likely be only when lightly loaded and low end may be compromised. If you think you boat is slow....run it against any other aluminum deep vee boat of same size and hp. You'll likely find it's just as fast if not faster than most anything out there.
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  #3  
Old 12-18-2016, 11:39 AM
rickn rickn is online now
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My brother has the same rig. He hasn't done any thing with the prop, whatever it came with. Two of us, kicker, 3 batteries, awesome holeshot, top end about 48. I don't think there's much more there.
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  #4  
Old 12-18-2016, 12:44 PM
PAUL-EYE PAUL-EYE is offline
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Thanks guys. Yes hole shot is amazing. And I do not want to spend a lot of money for 2 mph. My boat has 4 batteries and a kicker. I always am fully loaded with tackle and fuel I never want to take anything out. Thanks for the comments.
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  #5  
Old 12-18-2016, 02:58 PM
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T Mac T Mac is offline
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The Mercury Boathouse Bulletins manager and I did 2016 testing for Lund last spring.
The 19 tempest was the fastest we tested on similar (ie: 1875 Crossover w/ Merc 150 4/Stroke).
49.6 mph. @5650 rpm ...with 2 of us and a less than a tournament load was the best we did.

The results of all Lund tests should start showing up on in the not too distant future.https://www.mercurymarine.com/en/us/...ests/outboard/

PS: Lund no longer recommends Inertia on Lund aluminum hulls.
Lund doesn't offer it as a package option for them, either

Last edited by T Mac; 12-18-2016 at 03:06 PM.
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  #6  
Old 12-18-2016, 09:25 PM
REW REW is offline
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The quickest and easiest way to get more speed, is to put more HP on the back of your boat.

Put a 250hp on the back of the boat and you should pick up about another 8-12 mph.

Good luck
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  #7  
Old 12-19-2016, 03:00 AM
WireLine WireLine is offline
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Quote:
Originally Posted by REW View Post
The quickest and easiest way to get more speed, is to put more HP on the back of your boat.

Put a 250hp on the back of the boat and you should pick up about another 8-12 mph.

Good luck
Seriously? How is this helpful?
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  #8  
Old 12-19-2016, 07:35 AM
REW REW is offline
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Wireline,
This is helpful, since a given hull with a given hp driving it will have a limit on the top speed of the combo.

The original post speaks of a combo that is at or near the top of the combo's top speed potential.

To get more speed out of the situation, one needs to add more hp or use a different hull on that engine.

The only other simple way to get more speed out of the current combo is to remove every pound of non needed weight when one wants to achieve top speed. i.e. one battery, no kicker or trolling motor, no tackle, no gear, all storage boxes empty and just a 100 lb driver wearing his life vest with 5 gallons of fuel in the fuel tank. Under these conditions and with the motor at the right height and the right prop - set up for maximum speed - it might be possible to get to a speed that is greater than 50 mph. It might take a 1/4 mile to get the boat on plane due to the high pitched prop that one would use to obtain this high speed, but this experiment would show the potential of the hull and the motor combination.

Speaking of weight - that would mean removing the windshield, all of the compartment storage doors, the port side console and anything else that is not needed to float the boat. It would be pretty easy to remove an awful lot of weight from the boat's current configuration.

In a nut shell, rig the outfit, so that there is only 1 foot of boat hull in the water and only the blades of the prop in the water with everything else out in free air where there is no water drag and you are close to achieving the top speed of the rig.

To achieve the absolute best speed of a boat and motor combination, one needs to get virtually all of the boats hull and virtually all of the motors lower unit out of the water into the air where there is much less drag.

-----------------------
Does doing this make any sense for an average boat owner and user - of course not.
But the question was asked - how to get more speed out of a particular boat and motor combination. Reducing total rig weight and drag are two ways to increase the potential speed of a rig.

If you have ever ridden in a high powered, high performance bass boat - you will understand the message about reducing drag and increasing hp. When running flat out, a combination like this will have next to no boat or motor in the water and will literally be flying on a cushion of air - not water.

Good luck
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  #9  
Old 12-19-2016, 07:43 AM
REW REW is offline
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By the way, you have ownership of a wonderful 45 mph boat and motor combination that will give you thousands of hours of great performance and supply a tremendous fishing platform.

Enjoy your wonderful rig.

Be safe
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  #10  
Old 12-19-2016, 09:07 AM
bobk bobk is offline
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Quote:
Originally Posted by WireLine View Post
Seriously? How is this helpful?
It's not.
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