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  #31  
Old 02-17-2020, 01:14 PM
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Eyecatcher23 Eyecatcher23 is offline
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Originally Posted by trapin View Post
I'm ordering my Lund Impact 1875 XS with a 115 ProXS and 17 pitch stainless prop and I doubt I'm going to have a problem with it, especially with my fat arse driving. 38mph? That'll suit me fine. Walleye's can't swim that fast anyway. ;-)
Command thrust or no?
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  #32  
Old 02-17-2020, 02:22 PM
trapin trapin is offline
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Command thrust or no?
I dunno what you mean. It's the Mercury ProXS 115hp. What's Command Thrust?
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  #33  
Old 02-17-2020, 02:38 PM
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Eyecatcher23 Eyecatcher23 is offline
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Originally Posted by Eyecatcher23 View Post
Command thrust or no?
I dunno what you mean. It's the Mercury ProXS 115hp. What's Command Thrust?
It’s the larger/lower gear ratio lower unit. Either way it seems like a heck of an outboard, I’m just trying to gauge my prop pitch selection compared to similar boat set ups. It came with a 19p and I’m scared it might be over propped.
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  #34  
Old 02-23-2020, 08:14 AM
sledman77 sledman77 is offline
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Originally Posted by Eyecatcher23 View Post
It’s the larger/lower gear ratio lower unit. Either way it seems like a heck of an outboard, I’m just trying to gauge my prop pitch selection compared to similar boat set ups. It came with a 19p and I’m scared it might be over propped.

I know Lunds 2020 Redbook recommends the 17p Spitfire X7 it's a 4 blade SS prop. for the Merc 115 ProXS (not sure about how the lower gear ratio aspect comes into play).
Anyways that's how I ordered my 1775 Impact XS..
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2020 1775 Impact XS
115 Merc ProXS
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Hummingbird 10" SI MEGA G3N
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  #35  
Old 02-23-2020, 10:18 AM
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Originally Posted by sledman77 View Post
I know Lunds 2020 Redbook recommends the 17p Spitfire X7 it's a 4 blade SS prop. for the Merc 115 ProXS (not sure about how the lower gear ratio aspect comes into play).
Anyways that's how I ordered my 1775 Impact XS..
Sled man, you ordered right! You will be very happy with that prop.
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  #36  
Old 02-28-2020, 03:00 PM
Kevin R Kevin R is offline
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You are right, general rule is to max out HP. I run a 1850 Crestliner with a 175 HPDI Yamaha. (2002 was then rated for 175) The initial HP cost investment is a one time deal. The gas saving costs are forever, when you don't have to travel WOT to get where you want to go. I am able to keep my RPM rate at 40 and travel long lake runs at 40 MPH, thus sipping gas vs guzzling it with an underpowered 115 at WOT traveling 36-40 mph. And when I need to get up and go 50+ MPH is still their for me.
When I was in the market I looked at trade shows and was being hypnotized by the 115 sales pitch and the sales guys are good at convincing buyers of exactly what you are struggling with. They buy piles of 115's pre-season and must be incentivized to move them an any watercraft they sell. "This is all the HP you'll ever need." or "Why would you want to spend that extra money for something you will never need."
Good Luck and power up when the sticker says it's ok.
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I would total agree with this before fuel injection, I was running 200hp on 18-19 ft boats back in 1988 then in 2010 I owned what I would call my first boat not maxed it was rated for 150 & I had previously had the same boat with the 150 top speed 50 new boat had a 115 it top out at 45 but was easy on fuel even at full throttle. In 2000 I had purchased a new 20FT rated for 200 so I ordered a 200 optimax but motor was delayed so the 135 Opti went on until my 200 arrived after using them both I came to the conclusion that the 135 Opti was a better match less weight on the transom much better MPG & only about 2 MPH SLOWER after I added now needed trim tabs. It was this boat that started me not being a max power guy. If you can run the boat or check with owners some boats will do well even not having the max power. Fuel injection has made the smaller motors much more fuel efficient & Mercury now has command thrust on small outboards after owning one I am very impressed I would put the Mercury F115 CT on any boat rated up to 200HP. I have a friend who is a Guide that runs a Mercury F150 on a 24ft AVENGER with a tower, I have a 25 AVENGER with a F200 getting 4 MPG offshore these same boats are typically powered with F300 but do well with smaller motors. Last picture we had 9 on boat that day. Top speed 44 F300 will do over 50.
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  #37  
Old 03-01-2020, 08:14 PM
Hunts1 Hunts1 is offline
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I have a Lund Impact 1875 that is 2 years old. I have a Yamaha 115 SHO with aluminum prop. I run 40mph alone with gear and 36 fully loaded. Plenty fast for my needs. I got the 115 as it met my needs and trolls slow for the short trolling runs I do. I could afford the 150 but it didn’t seem necessary. I remain very happy with the 115 Yammie on the back of my boat. I wouldn’t change a thing. The prop is important though. I run an aluminum prop as I fish some rocky waters. A SS prop would get you better performance. Don’t listen to the “max the horsepower” folks. It may apply to many but not all.

Get what you need and not what others tell you that you need.
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  #38  
Old 03-28-2020, 01:34 PM
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Originally Posted by Hunts1 View Post
I have a Lund Impact 1875 that is 2 years old. I have a Yamaha 115 SHO with aluminum prop. I run 40mph alone with gear and 36 fully loaded. Plenty fast for my needs. I got the 115 as it met my needs and trolls slow for the short trolling runs I do. I could afford the 150 but it didn’t seem necessary. I remain very happy with the 115 Yammie on the back of my boat. I wouldn’t change a thing. The prop is important though. I run an aluminum prop as I fish some rocky waters. A SS prop would get you better performance. Don’t listen to the “max the horsepower” folks. It may apply to many but not all.

Get what you need and not what others tell you that you need.
2 things. 1) I will stay with my max HP rule simply because it eliminates any compromising you need to do in your head. We ski and fish alot with our 1850 Sportfish. Slalom skiing requires good hole shot and we ski at low to mid 30's. Fishing on Crane-Sandpoint-Namakan-Rainy, also then Clearwater-Pipestone, or Lac Seul means long runs on the water. I am just not a believer in constantly pushing WOT to get to where I'm going. When we fish these waters I rarely run over 4000 rpm, which puts me at about 40mph/gps. My 175HPDI is very fuel efficient with these rpm rules. Constant WOT is not in the best interest of longevity of your investment. My HPDI is a 2002 and zero added maintenance issues thru 18 years of use. I change plugs and lower unit lube and that's about it.
2) I run a SS prop and I know that proper pitch/diameter is key for hole shot, top end speed and fuel consumption. I tried 3 different props 19-3 blade, 21-3 blade, 21-4 blade. The 21-3 blade was the best, but not a complete win.
So, I had had it dual pitched, 20-21 by our local prop shop to get the best of both worlds.
Good Luck and Tight Lines
7
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