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Started By
Message
Kenner boat mph question - calling meajeaux2
Posted on 6/19/15 at 7:42 am
Posted on 6/19/15 at 7:42 am
i have a 21' kenner vision w/ 200hp merc (2-stroke) on the back and 21" pitch prop (merc labeled prop). no trim tabs or hydraulic jack plate, only manual adjustment (nuts and bolts). hole shot is acceptable but i'm wondering if i'm leaving something on the table with regards to top-end speed. the sticker on the engine says max rpm's of 5500. at 5500 rpm's i'm running about 40-42 mph on the gps. if i bury the throttle and exceed 5500 rpm's i'm topping out in the upper 40's mph range but less than 50 mph.
i know kenner's ain't the fastest hulls and i REALLY like the ride but should i be getting a little more speed outa' her?
performance i listed above is with 4 adults: 2 guys and 2 girls, no fishing gear, just cruising in calm water.
opinion's?
i know kenner's ain't the fastest hulls and i REALLY like the ride but should i be getting a little more speed outa' her?
performance i listed above is with 4 adults: 2 guys and 2 girls, no fishing gear, just cruising in calm water.
opinion's?
This post was edited on 6/19/15 at 7:55 am
9
Posted on 6/19/15 at 7:49 am to mack the knife
Our 21' sea hunt with a 150 Yamaha and 3 people and gear tops out at 55ish.
Posted on 6/19/15 at 7:54 am to maisweh
quote:
Our 21' sea hunt with a 150 Yamaha and 3 people and gear tops out at 55ish.
that's what i'm talking about. other's are getting better top-end speed than i am with less hp.
This post was edited on 6/19/15 at 7:57 am
Posted on 6/19/15 at 8:10 am to mack the knife
How many rpm will it turn with that 21?
Posted on 6/19/15 at 8:13 am to maisweh
I'd say your at the peak of your speed range. You can do some stuff to increase hp,you can play with props, plates etc and pick it up a little more. Kenners were built for ride, not
speed. A stage 1 hp increase, and some prop work would prob put you around 50. Most bay boats dont have padded hulls so your only going to see minimal gains. My father in law put 1200 in performance mods on his 200 Yamaha, bought a custom prop etc. He went from 50-52 to 54-55 on his Blazer Bay. He's still not happy cuz my stock Pathfinder will run 57-60. The hull design means everything.
speed. A stage 1 hp increase, and some prop work would prob put you around 50. Most bay boats dont have padded hulls so your only going to see minimal gains. My father in law put 1200 in performance mods on his 200 Yamaha, bought a custom prop etc. He went from 50-52 to 54-55 on his Blazer Bay. He's still not happy cuz my stock Pathfinder will run 57-60. The hull design means everything.
Posted on 6/19/15 at 8:15 am to mack the knife
I have the 22 Kenner with an Etec 200HO. I can get about 55 running with 4 adults no gear. The fastest I've ever had it was 63 alone, slight wind to my back, and running on fumes. I found my hull to be quite fast TBH.
Posted on 6/19/15 at 8:17 am to KJS
My dad has a 21 Kenner, not the vision. He has a 150 Yamaha 2 stroke and he can get 50ish out of it. That's also no jack plate. Ill check the prop but your vision is heavier then his but you should be able to hit 50.
Posted on 6/19/15 at 8:22 am to WHODAT514
quote:
WHODAT514
quote:
your vision is heavier
1850 lbs hull
quote:
you should be able to hit 50.
i'm JUST under 50mph
Posted on 6/19/15 at 8:39 am to mack the knife
I'm just under or right at 50 at 5,800 in my Nautic Star 19 with 150 even after some prop mods. I've just accepted that Bay Boats are slow. I may go ahead and get an Inertia, but I doubt I'd ever get over 52, so frick it.
Posted on 6/19/15 at 8:42 am to AlxTgr
i'm not looking to go balls-to-the-wall fast but i'm wondering if i'm getting everything out of this boat that i should
Posted on 6/19/15 at 8:44 am to mack the knife
quote:
i'm not looking to go balls-to-the-wall fast but i'm wondering if i'm getting everything out of this boat that i should
Doesn't sound like it.
Posted on 6/19/15 at 8:46 am to mack the knife
quote:If you are not exceeding 5,800 buried, then there's not much you can do. If you think you can exceed, then more pitch or faster steel is the only answer. Have you looked for those tests that they do one boats? Yours might have been done.
i'm not looking to go balls-to-the-wall fast but i'm wondering if i'm getting everything out of this boat that i should
Posted on 6/19/15 at 8:52 am to mack the knife
quote:
Our 21' sea hunt with a 150 Yamaha and 3 people and gear tops out at 55ish.
that's what i'm talking about. other's are getting better top-end speed than i am with less hp.
Damn. ya'll need to be happy. My 19.1 Mako with 150 tops out at 42 MPH at 5800 RPM and sucks some gas.
Posted on 6/19/15 at 8:54 am to AlxTgr
quote:
Have you looked for those tests that they do one boats? Yours might have been done
what tests are you referring to?
btw, i'm perfectly happy with cruising along at 40 mph. i'm reall just curious.
Posted on 6/19/15 at 9:02 am to mack the knife
Top speed = RPM/Ratio * Pitch/constant (1 - (slip/100))
Top speed of that prop (prop only, no hull, zero drag) in a perfect world without any slip is around 57 mph. The world is an imperfect place so figure you're losing somewhere between 6 and 10% at full throttle so let's call it 53 mph for that prop at 5500 rpm.
In other words, you right where you should be. Hulls and outboards vary from boat to boat so I would say + - 3 mph is an acceptable range for a non racing hull.
There are too many variables to say for sure. Your boarboad could be too high in the water and it's blowing out or it could be too low causing drag. Maybe you could trim the motor out a little bit or move some weight to the front of the boat.
I would say that 42 mph, loaded with 4 adults, is pretty average. You could probably squeeze a few mph out of the hull by moving things around or raising/lowering the motor, but is it really worth all the hassle?
Top speed of that prop (prop only, no hull, zero drag) in a perfect world without any slip is around 57 mph. The world is an imperfect place so figure you're losing somewhere between 6 and 10% at full throttle so let's call it 53 mph for that prop at 5500 rpm.
In other words, you right where you should be. Hulls and outboards vary from boat to boat so I would say + - 3 mph is an acceptable range for a non racing hull.
There are too many variables to say for sure. Your boarboad could be too high in the water and it's blowing out or it could be too low causing drag. Maybe you could trim the motor out a little bit or move some weight to the front of the boat.
I would say that 42 mph, loaded with 4 adults, is pretty average. You could probably squeeze a few mph out of the hull by moving things around or raising/lowering the motor, but is it really worth all the hassle?
Posted on 6/19/15 at 9:04 am to mack the knife
quote:
max rpm's of 5500. at 5500 rpm's i'm running about 40-42 mph
How much throttle do you have left?
quote:
bury the throttle and exceed 5500 rpm's i'm topping out in the upper 40's mph range but less than 50 mph
You should be able to get close to that same speed by spinning a bigger wheel that won't exceed your 5500 rpm. However, you're going to impact your hole shot. I'd suggest trying some props -- 3 and 4 blade. Make sure to try some that are vented to give you the best hole shot possible.
All that said -- you also may want to consider what all of that does to your gas consumption. My guess is, what you have set up is probably the best performance/fuel burn-rate combination for your hull.
Posted on 6/19/15 at 9:05 am to mack the knife
Kenner's are freaking heavy, bro. But they ride great.
Posted on 6/19/15 at 9:05 am to Motorboat
quote:
Damn. ya'll need to be happy. My 19.1 Mako with 150 tops out at 42 MPH at 5800 RPM and sucks some gas.
Two stroke - chump.
Posted on 6/19/15 at 9:08 am to Barf
quote:
Barf
quote:
Top speed = RPM/Ratio * Pitch/constant (1 - (slip/100))
never knew this.
fuel consumption is really good as well now. like i said, i'm not looking to or wanting to make drastic changes but i was just wondering if i'm getting all i should.
Posted on 6/19/15 at 9:09 am to mack the knife
Is your gear ration on that engine 1.87?
If so, with a 21 pitch prop, 5500 rpms, and speed of 42 mph, you are getting some significant prop slip at 28%.
Talk to some prop experts about your set-up, could make a world of difference for you
If so, with a 21 pitch prop, 5500 rpms, and speed of 42 mph, you are getting some significant prop slip at 28%.
Talk to some prop experts about your set-up, could make a world of difference for you
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