have a prop question

[coonhunter39367]

hi im new to props got a question i have a 17 foot skeeter with a 110 evinrude on it the boat will run 45 empty or 41 or 42 loaded the prop has 13 3/8X 17 stamped on it i dont know what rpm its turning but she is screamin what size prop do i need to get the rpms down and the speed up any help would be great

 

[Dhadley]

Re: have a prop question

Get the rpm down from what to what? Performance / efficiency is like planning a trip. In order to get where you want to be you have to know where you're starting from.

 

[Dhadley]

Re: have a prop question

Running the calculations and assuming about 10-12% slip and assuming the speed is by GPS you may indeed be at the high end of your target rpm but that's better than being at the low end. But again, we can't assume.

 

[steelespike]

Re: have a prop question

You could get yourself a tinytach;about $50 and easy to install.One for your motor will work on any 4 cylinder 2 stroke without regard to stator poles.

 

[coonhunter39367]

another prop question

another prop question

hi i had posted a thread last week about prop size and pitch and i had left out some info the boat is a 2000 skeeter 166 its got a 110 evinrude on it at wot trimed the best i can get it its turning around 6300 rpm the prop thats on it is a stainless 13 3/8X17 this boat pulls a tube or skier fine but it tops out about 41 loaded or 45 unloaded i was wanting a little more speed out of it so what should i change on the prop size and pitch or just pitch any help would be nice thanks

 

[steelespike]

Re: another prop question

Re: another prop question

What year is the motor?I couldn't find it.
I have to wonder if the tach may not be accurate. There may be a selector switch
on the back note its position and rotate it a few times to clean the contacts.
With an rpm of 6300 your hole shot should be brilliant.Neck snapping.I think the typical prop on that motor is 17-19.You would need a 21 to get to about 5,500.Its possible if your boat is light and fast it could use a 21.See if you can varify the tach.

 

[Don S]

Re: another prop question

Re: another prop question

Your original post was about 15 posts down, so in order to keep all the information in one thread, I merged the two together.

 

[coonhunter39367]

Re: another prop question

Re: another prop question

the motor is a 1988 i believe and yes sir it will get out of the hole quick fast and in a hurry it just dont have nothing on topend the motor come off of a 20 foot bayboat and i have never run the numbers to check the year

 

[steelespike]

Re: another prop question

Re: another prop question

We can probably assume the tach is accurate.If you go to a 21" pitch it will put your rpm at about 5,500-5,700. Probably close to 50.The 21s hole shot will be slower.