Boat test
 

Just as an FYI my Yamaha manual says 4500 -5500 as the WOT setting. Seems very strange to have such a wide range on RPM for WOT.

Ran my boat a local lake this last weekend with the Navman system and a Lowrance 350 GPS/FF/Plotter, full fuel ( 60 gal ) 1 person, no T-top, med load of gear.
Using the Boating Mag test profile ( 90% of fuel cap 54 gal.) Boat had maximum range of 186 statute miles.

Test results are as follows.

RPM * * * * *MPH * * * * *GPH * * * * *Range * * * * *MPG
1000 * * * * *5.3 * * * * * *2.4 * * * * * *119 * * * * * * 2.2
2000 * * * * *8.2 * * * * * *4.5 * * * * * * *98 * * * * * * 1.8
2500 * * * *13.0 * * * * * *6.1 * * * * * *115 * * * * * * 2.1
3000 * * * *20.5 * * * * * *7.1 * * * * * *156 * * * * * * 2.9
3500 * * * *28.3 * * * * * *8.2 * * * * * *186 * * * * * * 3.4
4000 * * * *33.5 * * * * *10.3 * * * * * *176 * * * * * * 3.2
4500 * * * *38.6 * * * * *12.0 * * * * * *174 * * * * * * 3.2
5000 * * * *43.4 * * * * *15.6 * * * * * *150 * * * * * * 2.8
5400 * * * *48.5 * * * * *20.1 * * * * * *130 * * * * * * 2.4

It's nice to know I can get a 150 mile range with a wide range of speeds. *After looking at the numbers I am going to add a 19 gal permanent tank under the console. We regularly fish 30-50 miles offshore for tuna and will need the extra fuel for trolling and saftey margin.
I ordered a T-top to be made locally and that will increase fuel usage also. *
These tests were made under ideal conditions, no wind, 75 degrees and on a lake with no swell or chop. Please do not use these numbers for your boat. *

I can say that I have been very satisfied with the Navman unit so far. It says to mount sensor in a vertical position for best results but I mounted mine right above the gas tank in a horizontal position and put a small fuel filter right in front of it, seems to work great. The features are much better than the FloScan that I had in my last boat.
You get current consumption,total, trip & fuel remaining w/alarm. You do have to reset the fuel remaining after each fillup. You can also set it to read Liters, Imp. gallons and US gallons and also has a calibration mode if readings are not exact. My Floscan system was consistently off by about 3-5 % over and under.
This thing a great buy at $149.00 from outerbanks.com
no tax and no shipping charges.
No I don't work there but I would if I could get a big discount ;D

Charlie Buzzetti

Re: Top Speed??
 

Hey Charlie, I like the sound of that Navman. It's a good price for all those features. I may have to look into one myself. ;D
PS, you should get that bracket in a couple of days. ;)

Re: Top Speed??
 

I also forgot to mention that it fits into a 2 1/8" hole. So it takes very little room on the dash. It does need about 3.5" behind dash.
I like knowing exactly how much fuel is in the tank. I have had std gas gauges lead me astray before.

Thanks for the update on the bracket, it's time to start looking for the kicker to put on it.

Cbuzz

Re: Top Speed??
 

Wow I guess you no your boat. I would like that kind of system. But I have spent so much this year with the conversion and all that it anit happening this year.
CBuzz what size motor do you have?? 5000 rpm 43.4 mph. My I/O 165 had all it could do to get me to 30 mph. I have been hoping that this 175 Yamaha would inprove that some. And sounds like it will. Of corase there are differentinces in all boats even if they are the same. But I have a 1974 cuddy and it is a heavy boat.

Re: Top Speed??
 

MJ, From my experience in having both outboards and I/O's, unless you get into high performance motors, an outboard of equal horsepower as an I/O will give you much better speed. It's mostly due to the power to weight ratio.
My guess is, you'll top out at around 40-45 mph with that 175 Yammi provided you get the rpm's where they need to be. I get around 38 mph with my 150 but I'm not sure I'm getting full WOT (need to experiment more once I splash) and cbuzz is getting just over 48 mph with his 200 hp. So you should end up somewhere in between.
As we discussed before, you may find that you'll need trim tabs to give the stern a little more lift and a better attitude because of the offset of the bracket.
Weather's not looking too good and neither is the extended forcast for the weekend. When do you think you'll be splashing?

Re: Top Speed??
 

1991 V-20 CC, 1992 200 Yammie.
I had the opportunity to watch the boat from shore as a friend drove it around.
I was impressed by the way it looks in the water at speed. Bow up 3-5 degrees and riding well back on the hull. Very similar to the way a large sportfisher looks at speed.
I have yet to get it on the ocean. It has been very windy here and the salmon have not really started to bite yet anyway. Forecast for this week is increasing winds thru weekend up to 30 knots. Only blowing 10-20 now with a 4-6 foot swell plus wind chop.
The good side is it doesn't blow as hard in the summer and the Albacore tuna are starting to show up in San Diego. Should be mid June before we get a shot at them here.

Re: Top Speed??
 

CBuzz,
* *Thanks for posting the stats with your new boat!! * They (v20's) really do look great. *

Re: Top Speed??
 

iI am repowering a v20 with a 200 optimax. I cannot find what shaft length to use. HELP..

Re: Top Speed??
 

Pbain you will need a 25" I belive. You measure from the top of the transom were the motor will rest down to the very bottom of the boat (center) this will be your shaft leanth. What size shaft do you have on there now??
I have repowered with a Yamaha 175 and a gill bracket. I have used it anough now to coment on it. I LOVE IT!! I get 5000 rpm and I get 40 mph when I am alone. I curise at 4000 to 4400 and go about 32 to 35 much nicer then the old I/O. Now I am not sure on the excat milige but I go from Green pond Falmouth to Laucs Shgolas which I no this is a 13.5 mile run one way. 27 mile round trip plus all the running back and foruth after a drift. One day of this I use about 15 to 18 gal of gas. The old I/O used about 13 to 15 so I feel that I am doing ok.

Re: Top Speed??
 

thanks for the help. I had an older 200 merc. and wasn't sure if they measured the same.