My boat is SLOW

[thx997303]

Okay, so I have a 14 ft fiberglass boat with a Johnson 9.5 Hp outboard on it and with a relatively light load. (two people, 3 gallons of gas and only necessary equipment) I can only go 7 mph according to my gps.

I'm confused, I'm sure this combo should go a bit faster.

The prop is an 8.5 pitch.

 

[bobbyc]

Weight of passenger and driver???? Angle adjustment on transom??? Motor running on both cylinders??? Planing or plowing???

 

[omc_10]

a 9.5 hp on a 14ft "fiberglass" boat is the wrong conbo

there is no way that the 9.5 hp will get the boat on plane to much weight for the engine!

 

[galamb]

When I run a 9.9 on my 14 foot aluminum (220 pound boat, 75 lb motor, 25 lbs of gas, maybe 20 pounds of junk/safety gear and 2 people - 300 lbs) so maybe 650'ish pounds I get maybe 15-16 mph.

What's the max horsepower rating for your boat (check the plate).

For a boat to perform "as designed" you need to run a motor that's at least 80% of the max rating.

So if your boat is rated for 30 horses you would have to run at least 25 (30 x .8 = 24 horses minimum)....

 

[omc_10]

fiberglass is alot heavier then aluminum i have a 15ft fiberglass boat with a 40hp on it and i cant get her going about 25-30mph

a 9.9 on my boat would troll my boat wouldnt even come close to planning it

 

[thx997303]

It seems to plane just fine.

The motor sits like this.

http://i312.photobucket.com/albums/ll331/thx997303/Boat/100_2471.jpg

The boat weighs maybe 550 lbs. People are 140 and 160 lbs.

Edit: Never mind the 550 lbs. I just lifted the boat, trailer, and tires off the ground myself and I'm not a particularly strong man. 5'6" and 140 lbs.

 

[omc_10]

to me that is alot of weight for a 9.5 what is the max rateing on the boat?

 

[thx997303]

I have no idea.

 

[omc_10]

look at the back of the boat there shoudl be a silver plate giveing you some info

 

[thx997303]

All it has is Fabuglas Co inc and a model number. No more information.

 

[mnobfan]

There is some info on Fabuglas at http://www.fiberglassics.com/library/Fabuglas but they are missing a lot of years.

 

[bobbyc]

The motor angle is way too far out...drop it down several notches so it sits as close as possible to the transom...from that point raise it a notch at a time after testing it...that will give you the best angle to use.

 

[omc_10]

if you want more performance then what you have buy another engine go up to a 30 or 40 hp

 

[thx997303]

If only I had the extra money to buy another engine. It is unfortunately not an option.

I will try bringing the motor in and see how it goes. I really don't need speed, but I would like 10 mph out of it.

 

[omc_10]

true then try playing with the trim and see what happens good luck!

 

[thx997303]

Well, from what I could see, my boat should weigh 450 lbs.

 

[omc_10]

i would say it is closer to 600

 

[thx997303]

Loaded, probably a bit above 600 but the dry hull is supposed to weigh 450 according to the fabuglas brochure.

 

[omc_10]

ok so say around 700 pounds which is a far amount for a 9.5 especially if it doesnt plane alot of pressure fromt he water

 

[thx997303]

It is a fair amount. It is raising the bow out of the water though. Probably because of how far out the outboard is.

I MAY be able to trade my 9.5 for a 35 hp. Guy has a boat too small for the outboard and I have an outboard too small for my boat.

I'm going to play with the trim before I do a trade though.

I know my outboard runs good.

 

[omc_10]

try putting ur gas tank or battery in the front to try and get the bow down and onto plain