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Author Topic:   200 Dauntless, Verado 175 Gen-I

boatdryver posted 05-30-2008 03:18 PM ET (US)
I thought this performance data might be of interest to anyone wondering about real world fuel figures on a mid sized trailerable boat with a modern Mercury Verado 175-HP Generation-One engine. This Boston Whaler 200 DAUNTLESS is a 2007 20-foot 6-inch by 8-foot 6-inch beam center console model introduced in 2007 with a conventional modified V-hull form aft instead of the previous Dauntless hull shape (which was I believe somewhere in between this and a Montauk type shape). I would expect the tradeoff in return for a smoother ride to be a little higher fuel consumption with the new shape. I've owned the boat for three months and have 22 hours on the tachometer.
Test conditions; Dry weight about 3,200-lbs, plus half-full fuel (35 gal), and one person on board; flat water; 5-knots of wind; factory T-top and bottom paint; Engine mounted one hole up; Anti-ventilation plate 1 to 2-inches above water, not changed from factory setup; fuel flow per Smartcraft; 87 Octane.
RPM GPH Statute MPH by GPS 2 ways MPG
650 0.3 2.8 9.2
1200 0.8 5.0 6.25
3250 4.2 21.5 5.12
3500 4.0 23.7 5.4
3750 5.0 25.5 5.1
4000 5.5 26.9 4.9
4500 7.4 31.2 4.2
6400(WOT) 20.6 43.4 2.1
I found it interesting that MPG doesn't change significantly from 3250 to 4000 rpm, so I can let engine noise and water conditions dictate my rpm.
With two on board 3250 is a mushy plane and with three on board it takes 3500 to achieve a solid plane. Of course with heavier loads the fuel consumption will suffer at all speeds
glen e posted 05-30-2008 03:39 PM ET (US)
[N]ice report. [W]hat prop? I assume a [MIRAGEplus]. [W]hat pitch? 6,400 is a bit high. [Y]ou could probably go up one pitch and get a bit more speed and drop to a perfect 6100-6200.
boatdryver posted 05-30-2008 03:50 PM ET (US)
Prop is a 15 1/2 X 17 MIRAGEplus.
glen e posted 05-30-2008 04:46 PM ET (US)
[W]ould be interesting to see how it worked with a enertia 19. [I]f you're anywhere near [P]ompano [B]each Florida you can borrow mine if you want.
boatdryver posted 05-30-2008 06:23 PM ET (US)
Actually, with two on board and 75% to full fuel the max rpm with the 17 pitch MIRAGEplus is 6,200. I don't care anything about max speed. My priority is quiet cruise around 22-25 mph. If I could reduce rpm by 200 and maintain the same speed it might be worth a prop change.
I'm in the San Francisco area.
With the MIRAGEplus 15.5 X 17 prop I get mild ventilation on hole shot performed at medium power, as the V transom digs a big hole and the motor is not buried.
I've arrived at doing a more nearly full throttle hole shot for about the first second and a half, then pulling back quickly on the throttle to 3500-3750. No ventilation then, and plenty quick to plane (about 3 seconds). Does this strategy sound reasonable?
Jim
glen e posted 05-30-2008 08:44 PM ET (US)
[S]ounds perfectly resonable. [F]or me, MIRAGEplus ventilates quickly. ENERTIA less, TEMPEST and REVOLUTION4 none whatsoever. Ask Mr Clark here what he thinks. I wonder what a 15 REVOLUTION4 would do? I imagine much of what you want, however I think the improvements would not be a night and day difference as your numbers look good now.
Good luck and congrats!
jimh posted 05-31-2008 08:33 AM ET (US)
That mid-throttle fuel economy looks very good. Thanks for the data. I am sure others will find it very interesting.
Sal A posted 06-01-2008 06:07 PM ET (US)
I appreciate the data. I have the same motor. Thank you.
boatdryver posted 06-02-2008 12:04 AM ET (US)
You're welcome, Sal. I forget which hull you have.
I'd be interested in any comments from anyone regarding what technic others with a boat weight and motor similar to mine have arrived at to accelerate from a standing start in order to minimize prop ventilation.
As I mentioned, I for now am using a full throttle start for the first second and a half. that kind of bothers me because I don't drive a car that way and rarely run a boat wide open.
JimL
boatdryver posted 06-02-2008 12:05 AM ET (US)
You're welcome, Sal. I forget which hull you have.
I'd be interested in any comments from anyone regarding what technic others with a boat weight and motor similar to mine have arrived at to accelerate from a standing start in order to minimize prop ventilation.
As I mentioned, I for now am using a full throttle start for the first second and a half. that kind of bothers me because I don't drive a car that way and rarely run a boat wide open.
JimL
andygere posted 06-02-2008 03:24 PM ET (US)
Jim, nice performance report. The boat clearly goes as good as she looks. I have never been a big fan of the post classic hulls, but the 200 Dauntless is a very good looking boat.
In my Outrage 22 Cuddy, I typically give it a fair amount of throttle to get on plane, but do not have any problem with ventilation if I don't. I'm running a 17" Mercury Offshore/Vensura (stainless 4 blade) which holds in like crazy, gives a nice holeshot and good top end. If you have a chance to run one of these, it might be worth a try. My motor is a 200 h.p. E-TEC, mounted in the third hole down from the top.
boatdryver posted 06-10-2008 11:12 AM ET (US)
birdsey, Here's the type of chart I was thinking you could do on your repower. It only took me about 30 minutes to do the run.
JimL
tbirdsey posted 06-10-2008 08:28 PM ET (US)
JimL
Its on my list!!

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Author	Topic: 200 Dauntless, Verado 175 Gen-I
boatdryver	posted 05-30-2008 03:18 PM ET (US) I thought this performance data might be of interest to anyone wondering about real world fuel figures on a mid sized trailerable boat with a modern Mercury Verado 175-HP Generation-One engine. This Boston Whaler 200 DAUNTLESS is a 2007 20-foot 6-inch by 8-foot 6-inch beam center console model introduced in 2007 with a conventional modified V-hull form aft instead of the previous Dauntless hull shape (which was I believe somewhere in between this and a Montauk type shape). I would expect the tradeoff in return for a smoother ride to be a little higher fuel consumption with the new shape. I've owned the boat for three months and have 22 hours on the tachometer. Test conditions; Dry weight about 3,200-lbs, plus half-full fuel (35 gal), and one person on board; flat water; 5-knots of wind; factory T-top and bottom paint; Engine mounted one hole up; Anti-ventilation plate 1 to 2-inches above water, not changed from factory setup; fuel flow per Smartcraft; 87 Octane. RPM GPH Statute MPH by GPS 2 ways MPG 650 0.3 2.8 9.2 1200 0.8 5.0 6.25 3250 4.2 21.5 5.12 3500 4.0 23.7 5.4 3750 5.0 25.5 5.1 4000 5.5 26.9 4.9 4500 7.4 31.2 4.2 6400(WOT) 20.6 43.4 2.1 I found it interesting that MPG doesn't change significantly from 3250 to 4000 rpm, so I can let engine noise and water conditions dictate my rpm. With two on board 3250 is a mushy plane and with three on board it takes 3500 to achieve a solid plane. Of course with heavier loads the fuel consumption will suffer at all speeds
glen e	posted 05-30-2008 03:39 PM ET (US) [N]ice report. [W]hat prop? I assume a [MIRAGEplus]. [W]hat pitch? 6,400 is a bit high. [Y]ou could probably go up one pitch and get a bit more speed and drop to a perfect 6100-6200.
boatdryver	posted 05-30-2008 03:50 PM ET (US) Prop is a 15 1/2 X 17 MIRAGEplus.
glen e	posted 05-30-2008 04:46 PM ET (US) [W]ould be interesting to see how it worked with a enertia 19. [I]f you're anywhere near [P]ompano [B]each Florida you can borrow mine if you want.
boatdryver	posted 05-30-2008 06:23 PM ET (US) Actually, with two on board and 75% to full fuel the max rpm with the 17 pitch MIRAGEplus is 6,200. I don't care anything about max speed. My priority is quiet cruise around 22-25 mph. If I could reduce rpm by 200 and maintain the same speed it might be worth a prop change. I'm in the San Francisco area. With the MIRAGEplus 15.5 X 17 prop I get mild ventilation on hole shot performed at medium power, as the V transom digs a big hole and the motor is not buried. I've arrived at doing a more nearly full throttle hole shot for about the first second and a half, then pulling back quickly on the throttle to 3500-3750. No ventilation then, and plenty quick to plane (about 3 seconds). Does this strategy sound reasonable? Jim
glen e	posted 05-30-2008 08:44 PM ET (US) [S]ounds perfectly resonable. [F]or me, MIRAGEplus ventilates quickly. ENERTIA less, TEMPEST and REVOLUTION4 none whatsoever. Ask Mr Clark here what he thinks. I wonder what a 15 REVOLUTION4 would do? I imagine much of what you want, however I think the improvements would not be a night and day difference as your numbers look good now. Good luck and congrats!
jimh	posted 05-31-2008 08:33 AM ET (US) That mid-throttle fuel economy looks very good. Thanks for the data. I am sure others will find it very interesting.
Sal A	posted 06-01-2008 06:07 PM ET (US) I appreciate the data. I have the same motor. Thank you.
boatdryver	posted 06-02-2008 12:04 AM ET (US) You're welcome, Sal. I forget which hull you have. I'd be interested in any comments from anyone regarding what technic others with a boat weight and motor similar to mine have arrived at to accelerate from a standing start in order to minimize prop ventilation. As I mentioned, I for now am using a full throttle start for the first second and a half. that kind of bothers me because I don't drive a car that way and rarely run a boat wide open. JimL
boatdryver	posted 06-02-2008 12:05 AM ET (US) You're welcome, Sal. I forget which hull you have. I'd be interested in any comments from anyone regarding what technic others with a boat weight and motor similar to mine have arrived at to accelerate from a standing start in order to minimize prop ventilation. As I mentioned, I for now am using a full throttle start for the first second and a half. that kind of bothers me because I don't drive a car that way and rarely run a boat wide open. JimL
andygere	posted 06-02-2008 03:24 PM ET (US) Jim, nice performance report. The boat clearly goes as good as she looks. I have never been a big fan of the post classic hulls, but the 200 Dauntless is a very good looking boat. In my Outrage 22 Cuddy, I typically give it a fair amount of throttle to get on plane, but do not have any problem with ventilation if I don't. I'm running a 17" Mercury Offshore/Vensura (stainless 4 blade) which holds in like crazy, gives a nice holeshot and good top end. If you have a chance to run one of these, it might be worth a try. My motor is a 200 h.p. E-TEC, mounted in the third hole down from the top.
boatdryver	posted 06-10-2008 11:12 AM ET (US) birdsey, Here's the type of chart I was thinking you could do on your repower. It only took me about 30 minutes to do the run. JimL
tbirdsey	posted 06-10-2008 08:28 PM ET (US) JimL Its on my list!!