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Author Topic:   honda 9.9 on a 13 footer
paco355 posted 05-18-2003 07:24 PM ET (US)   Profile for paco355   Send Email to paco355  
i was figuring the boat would go about 12 to 13 mph but the best i could get with me the wife and son and some fishing stuff was 9.5 . does that seem right ? the prop is a 9-1/4 X 8 inches aluminum 4 blade . any suggestion on what to do to get a few more mph . the pin is in the 4th hole up out of 5 hole .
David Jenkins posted 05-19-2003 06:51 AM ET (US)     Profile for David Jenkins  Send Email to David Jenkins     
The boat is rated for a 40 hp engine and you are concerned because it doesn't go fast enough with a 9.9 carrying two adults?
paco355 posted 05-19-2003 09:57 AM ET (US)     Profile for paco355  Send Email to paco355     
david the lake i go to the most is limited to 10 horse . so a 40 horse would be no good to me .
David Jenkins posted 05-19-2003 04:11 PM ET (US)     Profile for David Jenkins  Send Email to David Jenkins     
Right. Now I understand. I bet the 9' would get up and go with a 9.9 hp engine, but the 13 is a heavy boat. Best of luck.
makksumm posted 05-20-2003 07:53 PM ET (US)     Profile for makksumm  Send Email to makksumm     
paco355, Do the restictions specify how many 10's can be on the back? Or just motor size no greater than 10hp allowed? Add one or two more, and you may get some decent speed. :-) (just joking around paco)
brisboats posted 05-20-2003 09:10 PM ET (US)     Profile for brisboats  Send Email to brisboats     
Actually Paco I think with that load and horsepower you are doing quite well. The 13 hull roughly goes 1 mph per horsepower and you are exceeding that and with a load.


paco355 posted 05-20-2003 11:26 PM ET (US)     Profile for paco355  Send Email to paco355     
thanks for the input guys . honda offered a bigger prop 10 x 6.5 and called it a power trust i think i may try to get a prop that size and see what happens .
David Jenkins posted 05-21-2003 07:17 AM ET (US)     Profile for David Jenkins  Send Email to David Jenkins     
With a heavy load, you may want a smaller prop, not a bigger one.
brisboats posted 05-21-2003 09:53 AM ET (US)     Profile for brisboats  Send Email to brisboats     
Semantics? He is going bigger diameter with less pitch, that would move a heavier load but I doubt you will pick up much in the way of speed. Worth a try just to see though, would be great if you could rent that prop for a test run before you buy. While at the Honda dealer ask them what is the main difference between the 9.9 and the 15. If similar to an OMC its just the carb. You could switch over to the 15 carb leave the 9.9 cover and cheat a little on your lake. I am sure you wouldn't be the first. Just a thought.


wd posted 05-28-2003 01:46 PM ET (US)     Profile for wd  Send Email to wd     
paco 355 let me know if you get the 9.9 I am thinking about getting a mer 15hp 4 stroke on my 13ft whaler and would like to know how your boat does with the 9.9
Lil Whaler Lover posted 05-28-2003 06:54 PM ET (US)     Profile for Lil Whaler Lover  Send Email to Lil Whaler Lover     
Past experience previously reported here. 13' Whaler with 9.9 4-stroke Evinrude gave me 20mph on GPS with one 200 pound adult and 18.5 with 350 pounds of people and supplies. The 9.9 Honda should do much better that the numbers reported.
Paco, what elevation are you operating at? Elevation drains off horsepower.
If one looks at the old whaler literature they reported a speed of 20 mph with a 10 HP and a light load. (See Whaler Catalogue Collection). Dave
my1st13sport posted 05-29-2003 09:43 PM ET (US)     Profile for my1st13sport  Send Email to my1st13sport     
I have a 1974 13 sport with a 1998 40 hp 3 cyl. merc 2stroke,let me tell ya it seems a bit much for this hull, but it must just be me,although get this 40 hp merc wound up with my 13 sport hull,well let me tell you,I wish I had grab rails..
paco355 posted 05-29-2003 10:49 PM ET (US)     Profile for paco355  Send Email to paco355     
well to let you all know i have messes with it some more but didn't change the prop . with just me fishing stuff and 9 gallons of gas i can get 17.5 mph out of it . and i can run 2 days on 3 gallons of gas . i messed up on the 1st post i had the pin in the second hole up now i have it in the fourth hole up . i'm going to try a doel fin on it soon and see if that helps .
Kelly posted 05-30-2003 12:09 PM ET (US)     Profile for Kelly  Send Email to Kelly     
Be carefull using a doelfin on motor if the motor is not bolted onto the boat. A friend had the experience of the uplift from the doelfin pushing the motor right off of the transom. While Whalers are unsinkable, motors are not.


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