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Author Topic:   Propeller for Evinrude 35-HP

larpad posted 11-14-2005 10:48 AM ET (US)
[The author has an 1989 Evinrude 35-HP motor with a 10 X 13 propeller. He reports the engine speed seems high, but does not have a tachometer to measure.]
Is there a better choice [of propeller] to increase [boat] speed?
Peter posted 11-14-2005 01:16 PM ET (US)
That propeller is what my Evinrude 35 was turning on my classic 13-foot Whaler many years ago. If the engine really is revving high, you might want to check to see if you've spun the hub.
lorin posted 11-14-2005 04:28 PM ET (US)
If you use a 10x15 prop your engine speed should decrease and hopefully your boat speed (top end) should increase.
larpad posted 11-14-2005 05:45 PM ET (US)
The hub is not spun. [The boat] will do 26-MPH, but it should do closer to 30-MPH. The engine seems to rev way too high.
jimh posted 11-14-2005 09:09 PM ET (US)
I don't really see how any meaningful discussion can occur without measurement of engine speed and boat speed. If you think the engine speed is too high you should try a propeller with more pitch. It is as simple as that.
dburton posted 11-15-2005 12:33 PM ET (US)

This is a good time to consider adding a tach to your motor. I would recommend a Tiny-Tach. They work well and also give you an hours’ gauge.
I am assuming that you have a 13 foot Sport. The standard wire length of a Tiny-Tach is six feet. You will need 12 – 15 feet depending on your install. Order the tiny-tach directly from the company. The Tiny-Tach people will add additional length for a $10 charge. If you call them they will help you choose the right model.
Here is the url for their web site.
http://www.tinytach.com/tinytach/index.php

Here are a couple of threads that the tiny tach was discussed.
http://continuouswave.com/ubb/Forum4/HTML/000307.html

http://continuouswave.com/ubb/Forum4/HTML/003008.html
Doug
dburton posted 11-15-2005 12:50 PM ET (US)
By the way, I also have a 35-HP motor (1981) with a 10 X 13 propeller. I turn about 5100 rpm at WOT and have a top speed of around 28mph. I have been considering getting a lower pitch prop but I will probably stick with the 10 x 13.
It is possible that your prop is a lower pitch than a 13. A prop shop can change the pitch of a prop (within reason). A previous owner may have had it done.
Jimh is right. Get a tach.
Doug
Peter posted 11-15-2005 01:34 PM ET (US)
Well if he is running the 35 Evinrude on a classic 13 Whaler, then there were basically two propeller choices: 1) a 10 1/2 x 11 "power prop" good for water skiing and 2) 10 x 13 "speed prop" good for speed with light loads. At some point in the 1980s Evinrude changed the gear case and raised the gearcase ratio of the 521 cc 2 cylinder engine platform (20, 25, and 30 HP models). The older gearcase with the lower ratio has a straight skeg and the newer gearcase with the higher ratio has a swept back skeg. I think this change happened about the same time as they switched from flywheel to prop shaft HP rating. The change in gearcases effectively shifted the usable propellers for the classic 13 up one step. The 10 x 13 became the power prop and the 10 x 15 became the speed propeller.
The Judge posted 11-15-2005 01:43 PM ET (US)
Back in the days I had a 82 13' with a 35 Johnson. With the 10x13 and just my 120lb butt I would hit about 5500 WOT(redline). With the 10x15 I would hit about 5200 and haul booty but add another person and she would be a dog. I suggest getting a new 10x13 and call it a day.

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Author	Topic: Propeller for Evinrude 35-HP
larpad	posted 11-14-2005 10:48 AM ET (US) [The author has an 1989 Evinrude 35-HP motor with a 10 X 13 propeller. He reports the engine speed seems high, but does not have a tachometer to measure.] Is there a better choice [of propeller] to increase [boat] speed?
Peter	posted 11-14-2005 01:16 PM ET (US) That propeller is what my Evinrude 35 was turning on my classic 13-foot Whaler many years ago. If the engine really is revving high, you might want to check to see if you've spun the hub.
lorin	posted 11-14-2005 04:28 PM ET (US) If you use a 10x15 prop your engine speed should decrease and hopefully your boat speed (top end) should increase.
larpad	posted 11-14-2005 05:45 PM ET (US) The hub is not spun. [The boat] will do 26-MPH, but it should do closer to 30-MPH. The engine seems to rev way too high.
jimh	posted 11-14-2005 09:09 PM ET (US) I don't really see how any meaningful discussion can occur without measurement of engine speed and boat speed. If you think the engine speed is too high you should try a propeller with more pitch. It is as simple as that.
dburton	posted 11-15-2005 12:33 PM ET (US) This is a good time to consider adding a tach to your motor. I would recommend a Tiny-Tach. They work well and also give you an hours’ gauge. I am assuming that you have a 13 foot Sport. The standard wire length of a Tiny-Tach is six feet. You will need 12 – 15 feet depending on your install. Order the tiny-tach directly from the company. The Tiny-Tach people will add additional length for a $10 charge. If you call them they will help you choose the right model. Here is the url for their web site. http://www.tinytach.com/tinytach/index.php Here are a couple of threads that the tiny tach was discussed. http://continuouswave.com/ubb/Forum4/HTML/000307.html http://continuouswave.com/ubb/Forum4/HTML/003008.html Doug
dburton	posted 11-15-2005 12:50 PM ET (US) By the way, I also have a 35-HP motor (1981) with a 10 X 13 propeller. I turn about 5100 rpm at WOT and have a top speed of around 28mph. I have been considering getting a lower pitch prop but I will probably stick with the 10 x 13. It is possible that your prop is a lower pitch than a 13. A prop shop can change the pitch of a prop (within reason). A previous owner may have had it done. Jimh is right. Get a tach. Doug
Peter	posted 11-15-2005 01:34 PM ET (US) Well if he is running the 35 Evinrude on a classic 13 Whaler, then there were basically two propeller choices: 1) a 10 1/2 x 11 "power prop" good for water skiing and 2) 10 x 13 "speed prop" good for speed with light loads. At some point in the 1980s Evinrude changed the gear case and raised the gearcase ratio of the 521 cc 2 cylinder engine platform (20, 25, and 30 HP models). The older gearcase with the lower ratio has a straight skeg and the newer gearcase with the higher ratio has a swept back skeg. I think this change happened about the same time as they switched from flywheel to prop shaft HP rating. The change in gearcases effectively shifted the usable propellers for the classic 13 up one step. The 10 x 13 became the power prop and the 10 x 15 became the speed propeller.
The Judge	posted 11-15-2005 01:43 PM ET (US) Back in the days I had a 82 13' with a 35 Johnson. With the 10x13 and just my 120lb butt I would hit about 5500 WOT(redline). With the 10x15 I would hit about 5200 and haul booty but add another person and she would be a dog. I suggest getting a new 10x13 and call it a day.