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How Fast Does Your Boat Go?

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7 hours ago, Phillbo said:

I call... We need specs. I doubt any Chap gets 60+   

Several do Phil. GPS does not lie. Bone stock 496 HO, with some minor prop work, 89 octane fuel, unpainted bottom, open windshield, open transom door, lightly loaded, and perfect atmospheric conditions. She will do 60 fully loaded with 5 aboard, coolers full, and every thing my daughter's friends care to bring with. Here are some numbers from last September on an average day. I have seen 63 but that was with me only aboard, and near empty everything. A friends 28 Chap with twins always has the edge on my single. All that said, I am not a WOT guy anyway and typically cruise at 33. I will push the go stick forward a few times a season when conditions are good, and there are no other boats around, because at speeds approaching 60 and above, that hull tends to be a tad unstable. For me seeing the tach bounce off of 5,000 confirms that the engine tune is still valid, and a sub-standard pass could be an indication of a need to take a close look when she's back to home port. W

 

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I got 48 GPS MPH on a couple of occasions.  No isinglass, lightly loaded with 2 people, calm seas, no wind. I think that's as fast as my heavy boat will go.

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4 hours ago, Wingnut said:

Several do Phil. GPS does not lie. Bone stock 496 HO, with some minor prop work, 89 octane fuel, unpainted bottom, open windshield, open transom door, lightly loaded, and perfect atmospheric conditions. She will do 60 fully loaded with 5 aboard, coolers full, and every thing my daughter's friends care to bring with. Here are some numbers from last September on an average day. I have seen 63 but that was with me only aboard, and near empty everything. A friends 28 Chap with twins always has the edge on my single. All that said, I am not a WOT guy anyway and typically cruise at 33. I will push the go stick forward a few times a season when conditions are good, and there are no other boats around, because at speeds approaching 60 and above, that hull tends to be a tad unstable. For me seeing the tach bounce off of 5,000 confirms that the engine tune is still valid, and a sub-standard pass could be an indication of a need to take a close look when she's back to home port. W

 

 

+1 

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               RPM

                        SPEED

                  GPH

                   MPG

2150

17

6.7

2.537

2600

26

8.7

2.989

2650

26.8

9.5

2.821

2700

27

9.8

2.755

2750

28

10.2

2.745

2800

29

9.9

2.929

2850

30

9.9

3.03

2900

30.5

10.4

2.933

2950

31

10.4

2.981

3000

32

10.8

2.963

3050

33

11.4

2.895

3100

33

11.7

2.821

3150

34

11.5

2.957

3200

35

12

2.917

3250

36

12.6

2.857

3300

36.5

13

2.808

3400

37.7

14

2.693

3500

39

15

2.6

3550

40

15.5

2.581

3600

43

18

2.389

3700

46

21

2.19

3800

49

24

2.042

3900

53

27

1.963

4000

56

30

1.867

4500

57.3

33

1.736

4950

58.7

35.5

1.654

5000

59.9

37

1.619

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55 mph for me with people and gear.  Never had a chance to run it with a light load.   But the fuel burn rate is ridiculous at WOT.  

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I've got a very aggressive 17 inch prop that is actually specifically for big blocks so not a speed demon but I get very low 50's on GPS at 5000 but we always have a very light load of gear since we are on a lake and have no need to carry much.  I'd like to get a selection of props for fun and see what it can really do.  All that said, we almost never go WOT for more than a few seconds when it comes time to pass the base five liter everyone seems to have in their boats.  Ha ha.  

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Just to confirm a couple of the guys above, with the HO, the 256 will run over 60 and the 236 will with the 496.  As I posted, I've gotten a best speed of 57.3 on GPS with the stnd 496.  

Also, someone mentioned the rev limiter above.  That's true as I was bouncing off the rev limiter once before I had my props tweaked by BBlades.

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Boats will actually run faster if there is a slight chop rather than smooth as glass.  The glassy flat surface creates more surface tension (friction), which has to be overcome. A very slight chop reduces that surface tension!  

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I'm a little below average at 48 gps on Mag 5.7L 4bbl with BIII drive at 4500ish RPM.

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About 52. Had it at 48 via gps, with more left. 21’ H2O with Yamaha outboard. Btw my gas mileage is great with the outboard. Very pleased with it. 

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The 220 is now so old that the 'official' performance test results were done with GPS and Radar.  The radar test top speed was 58.8 and GPS was 56.4 and the Speedo showed 64 but that was with a B3 versus my B1.  That was with the 350 Mag MPI not the base five liter.  I'd love to test out props for a day and see what my 220 with the same 350mpi could achieve with the B1.  I think the 350 is a lot of engine for a 22 foot boat.  I tend to get a lot of inquiries in the summer as to which engine I'm running because it moves out surprisingly well because I have blasted past them and because it seems so many opted for the 5.0 and the outboards haven't caught on yet around me.  

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50 minutes ago, MonkeySeaII said:

I used to have a 21' Ebbtide with a 350.  That boat was really quick!

Good taste . . . 

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7 hours ago, MonkeySeaII said:

Just to confirm a couple of the guys above, with the HO, the 256 will run over 60 and the 236 will with the 496.  As I posted, I've gotten a best speed of 57.3 on GPS with the stnd 496.  

Also, someone mentioned the rev limiter above.  That's true as I was bouncing off the rev limiter once before I had my props tweaked by BBlades.

And your ride is heavier than mine so 57+ is pretty good. My 496 HO has the Bravo III-X drive too which is a different final drive ratio than the standard Bravo III.  W

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15 hours ago, Wingnut said:

And your ride is heavier than mine so 57+ is pretty good. My 496 HO has the Bravo III-X drive too which is a different final drive ratio than the standard Bravo III.  W

that was with perfect conditions, running down the River, slight chop, with the current, wind behind me.  I also had my props labbed by BBlades.  Best I've gotten on the lake is 56 and that's early Spring with cold water, low humidity, etc.  During the Summer season when the water is warmer and the air more humid--and the boat is loaded with all our crap, I can only squeeze out 53-54 on the GPS.  But I honestly rarely drop the hammer.  Only a couple times/year when I'm alone.

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In perfect conditions, with just me and a 1/2 tank of fuel, I can hit 54 on the GPS. But add another person or if there is a whisper of wind and I am around 50. 

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My 2000 280SSI with twin 350 mags ran 59.7 on the gps with just me onboard.

My 2013 287 with 8.2 mag runs 52 on the gps.

 

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Our five ton Signature 350 will go 48-50mph, however that is with a light fuel load, few passengers and none of the stuff currently onboard.

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So I took her out yesterday and reached 46.5 MPH (GPS) @ 4650 RPM. I have fresh bottom paint, about 77 gal gas, 10 gal water and full Isinglass windshield.

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 When I first got her in (92) she did 49, now with all that she has to haul in creature comforts she can do 45, but who cares, I only run her at 22 water and 55 hwy.  Denny.

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