RT188 top speed

[BigJfrank]

What are you guys seeing? I am getting about 45 MPH in ideal conditions at about 55-5600 RPM max, that's about as good as it gets. 115 OptiMax

[Jeff Hahn]

My buddy has an RT188 and about 45 mph is about top end with the 115 hp motor.

[almostlude01]

Getting about 45-47 on my 115 evinrude etec depending on conditions. I typically don't pack a crap ton of gear, half tank of fuel

[drtyrat30]

With my 115 ProXS CT with 21p tempest plus I'm seeing 47.5 gps loaded with gear and 3 Batts. With a power pole.

[oldgoat188]

I've actually gotten over 50 a couple of times. Merc 4s 115 , re-cupped 20pitch Trophy11 prop, 4" setback, 50% of trim tabs.

[Mike198P]

I've actually gotten over 50 a couple of times. Merc 4s 115 , re-cupped 20pitch Trophy11 prop, 4" setback, 50% of trim tabs.

Those rpm's look to be a little high.

[n2ratfishin]

I've got 50 a few times by myself in the winter. The conditions have to be right. I have a 2017 115 ProXS 4S. It's more of a 45 mph boat day in and day out and to be honest it sees lots of time in the 30's.

[Bosh]

45 is pretty normal unless you do a lot of tuning with props and motor depth etc. not a "speed boat" for sure.

[oldgoat188]

Those rpm's look to be a little high.

That was taken before the prop work was done. Runs at 5900 now. And like most I probably run most of the time at about 35mph.

[bass8]

49mph at 5800RPM is the best for me, running a 115 SHO

[jigging15]

Mine is a 2015 with Mercury 4 stroke and a 21 pitch Laser II on a 4" setback plate. It runs 41-42 loaded with 550 lbs of driver and passenger. 43 with just me. I really need to buy or try a 20 pitch Laser or a 19 Spitfire for mine and see if I can get a few more mph out of it.

[tcesni]

44 mph by myself with half tank of fuel with a 13 year old 90 hp Optimax

[winnebasschamp]

Mine is a 2015 with Mercury 4 stroke and a 21 pitch Laser II on a 4" setback plate. It runs 41-42 loaded with 550 lbs of driver and passenger. 43 with just me. I really need to buy or try a 20 pitch Laser or a 19 Spitfire for mine and see if I can get a few more mph out of it.

I have the same year and model motor with the same prop and setback plate. I'm getting 46 by myself and 44 with a passenger and gear. Not sure the difference, but I don't carry much gear at all.

[jigging15]

I have the same year and model motor with the same prop and setback plate. I'm getting 46 by myself and 44 with a passenger and gear. Not sure the difference, but I don't carry much gear at all.

Maybe mine is more of a motor mounting height issue. I need to look and see which holes mine is mounted in. I get great performance out of it. Jumps out of the hole good even with three guys and livewell full. Just not the top end numbers the other guys are getting. I thought if the lake froze over this winter I may send my prop to Cronxton to have it repitched to a 20 and have some cup added. I wish I had a merc monitor on it to get some true rpm readings. My gauge shows somewhere in that 5400-5600 even with the cool water temps we have right now in Missouri. Maybe I will run in to someone around here with a 20 pitch prop to let me try and see if it helps before sending mine off and possibly not getting any better numbers by repitching it.

[krr6581]

Those rpm's look to be a little high.

Analog tachs are notorious for not being accurate. When I installed my MercMonitor there was a 250 rpm difference. Analog my max RPM’s was reading almost 5900 rpms. Actual according to the monitor it was a little above 5700 with my 115 Optimax’s max RPM being 5750. So he more than likely is okay on rpms. Besides if he really was running that high he’d probably heard his motors alarm go off.

[jml]

Low forties, with aluminum stock prop. Hopefully get an x7 this spring.

[tin wacker]

I have a 188 115 4s merc mounted in the 3 rd hole . 45-46 gps tournament load . 5600 rpms analog tac with laser 2- 20p cupped. Recently put on hyd steering and 4 inch set back. Haven't run it much to see any improvement in speed. Handling has greatly improved. May try an x-7 -19 p in the spring.

[TxBassfisher]

I see 47-51 depending on water/wind conditions average being 48/49. I have hit 55mph GPS 3 times in the most perfect conditions you can ask for. 2017 pro XS 4s non-ct with 20p laser 2.

[GOTTA BIG SACK]

42-44 usually

[iabass8]

21p SS viper 115 Etec. 47-48.