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  #11  
Old 12-19-2016, 11:52 AM
staylor staylor is offline
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With the Tempest I think your set-up is pretty much optimum. The available 4 blade props are a bit slower than the Tempest unless you are having issues with not being able to lift the bow. I have yet to run into another brand/model of 3 blade prop that is any better than the Tempest in 14.5 diameter. A "wild card" is the 4 blade, 13.75 diameter Trophy Plus- but the small hub with its over and thru exhaust may kill your hole shot- and although the Trophy Plus carries the bow of my 17 ft hull nicely, it is not as good a bow lifter as the Tempest so it may not work on a 18 ft hull. On my 17 ft hull, a Starcraft, the Trophy Plus gains 1 mph over a equal pitch Tempest.

Have you raised your motor up to see if going up another hole or two helps top end?
Doug
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  #12  
Old 12-19-2016, 12:29 PM
staylor staylor is offline
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I should also add that my Merc 150 4S gets best top end when propped to around 5600-5700 rpm, rather than propping for best overall performance at 5700-5800 rpm.
Doug
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  #13  
Old 12-19-2016, 06:52 PM
PAUL-EYE PAUL-EYE is offline
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Hi staylor I had my dealer check the location of my motor and he said it was optimum. My boat runs 5600 to 5700 also. I was thinking of trying an enertia prop.
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  #14  
Old 12-19-2016, 10:10 PM
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Red Cabin Red Cabin is offline
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I've got the same rig without a kicker, 49 mph a couple times during the break in with a very light load. Since then it rarely hits 47 mph. But very little bow lift, just dump the throttle and gone!
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  #15  
Old 12-20-2016, 02:27 AM
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jeffbilodeau jeffbilodeau is offline
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Originally Posted by REW https://www.walleyecentral.com/forums...s/viewpost.gif
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



Quote:
Originally Posted by REW View Post
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
Absolutely ridiculous! The guy has a new boat and was just wondering if "other Impact owners" are getting similar performance or have experience in tweaking a little more speed out of their rigs. So he gets a reply to his question from someone with likely no direct experience with a 1875 Impact Sport talking about stripping the entire boat and putting a 250 on a hull rated for 150. How is this helpful to the OP? As Chris Berman would say...."COME ON MAN"!
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  #16  
Old 12-20-2016, 06:00 AM
Darrenf442 Darrenf442 is offline
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Only way to try and gain more mph is raise or lower your engine and/or change props. Either way its $$$$$ and no guarantee you will gain anything.
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  #17  
Old 12-20-2016, 12:44 PM
texasdeepv texasdeepv is offline
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I have that boat with a Honda 150. By myself (im 6'1" 210) in the boat i get 50-51 gps. Thats fully loaded with gear and a light chop on the water. I add my son in the deal and ill get 47-48. That 51 drinks the gas like crazy so i dont run it that hard all the time.
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  #18  
Old 12-20-2016, 01:49 PM
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MERCONLY MERCONLY is offline
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Honda Power Texas!!!!! The Honda 150 Vtec is a Killer Motor and way stronger than 150hp, just check the Honda Accord HP
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  #19  
Old 12-20-2016, 04:35 PM
texasdeepv texasdeepv is offline
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Its seems to be a good motor. So far no complaints. I initially wanted a 4 stroke Merc on it but the dealer sold me on the Honda. I didnt have and experience with the 150 on either brand.
Bottom end torque is really good on it and will plane the boat out pretty quick as well.
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  #20  
Old 12-21-2016, 08:52 AM
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big popi big popi is online now
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I have the same setup. I bumped 50 (on GPS) during the break-in with basically nothing in the boat. With the boat typically loaded I run 46-47 downstream & 44-46 upstream depending on the current in the Miss
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