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Author Topic:   Proper Prop For 75` `17 Currituck

whalernut posted 05-23-2000 09:32 PM ET (US)
Does anyone know what prop size would be for good all around use: Fishing-Tubeing-Runabout. Mostly used for very slow trolling. The engine is a 75` 85h.p. Johnson, it has no tilt/trim. I know they offer 13in.-15in.-17in.-19in.-and 21in. Should I use cupped or uncupped propellers? Please help! Regards-JACK.
kent posted 06-01-2000 12:55 AM ET (US)
Jack, I don't know if this is what you are looking for, but give it a try.
http://www.omc-online.com/docktalk/prop/propchrt.html
It is OMC's prop selection guide.
whalernut posted 06-01-2000 04:44 PM ET (US)
Thanks Kent, I`ll check it out! Regards-JACK.
Bill D posted 06-02-2000 08:06 AM ET (US)
Jack, Since you indicate in another post that you have no gauges I would suggest you work with a good prop shop. You should be able to borrow a tach and a number of different props. The prop people will be able to suggest correct props for you to test.Take them to your local lake and try each to see which preforms best on your setup. Measure times to get on plane and times to cover a set distance at WOT. And of course be sure your operating in the factory apporoved rpm range at WOT. Good Luck
BTW- I did this on my Montauk years ago and
was amazed at the difference in performance betweend brands of props, due to the cupping and rake differences.
whalernut posted 06-03-2000 07:18 AM ET (US)
Thanks Bill, thats a great idea and will give it a go! Regards-JACK.
jimh posted 06-07-2000 08:38 AM ET (US)
Having a tachometer is an important factor in determining proper prop choice. It is also handy to have when you have a guest at the helm: you can tell them "Just run at so-and-so RPM" and they'll be more comfortable about throttle setting.
If the console on the Currituck is like the one on my Sport, there is no good place to mount a tachometer. See http://continuouswave.com/whaler/reference/15/models.html for my solution: a sloping extension to the dashboard.
--jimh
whalernut posted 06-07-2000 06:31 PM ET (US)
Thanks Jim, I am haveing one installed as we speak, because the shop that is tuning my engine up recommended it for proper performance and monitoring it! Regards-Jack Graner.
wds posted 06-25-2000 09:26 AM ET (US)
We have a 1977 85 HP Johnson on a 17'.
A 15" steel prop is fine for water skiing, but limited on the top end at about 30-33 mph.
I's suspect a 17" or 19" will be ideal from a power point of view, but it make move too fast for trolling. There's a plastic plate available (forget the proper name) that attaches to the cavitation plate and can be lowered with a control string so it's vertical directly behind the prop. This slows the boat down considerably at idle for trolling.
whalernut posted 06-26-2000 04:48 PM ET (US)
Thanks wds, I am not sure what pitch prop is on my Currituck, but I may try a 15" prop. If that doesn`t slow it down enough, I`ll try the fish troller divise you mentioned. Regards-JACK.

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Author	Topic: Proper Prop For 75` `17 Currituck
whalernut	posted 05-23-2000 09:32 PM ET (US) Does anyone know what prop size would be for good all around use: Fishing-Tubeing-Runabout. Mostly used for very slow trolling. The engine is a 75` 85h.p. Johnson, it has no tilt/trim. I know they offer 13in.-15in.-17in.-19in.-and 21in. Should I use cupped or uncupped propellers? Please help! Regards-JACK.
kent	posted 06-01-2000 12:55 AM ET (US) Jack, I don't know if this is what you are looking for, but give it a try. http://www.omc-online.com/docktalk/prop/propchrt.html It is OMC's prop selection guide.
whalernut	posted 06-01-2000 04:44 PM ET (US) Thanks Kent, I`ll check it out! Regards-JACK.
Bill D	posted 06-02-2000 08:06 AM ET (US) Jack, Since you indicate in another post that you have no gauges I would suggest you work with a good prop shop. You should be able to borrow a tach and a number of different props. The prop people will be able to suggest correct props for you to test.Take them to your local lake and try each to see which preforms best on your setup. Measure times to get on plane and times to cover a set distance at WOT. And of course be sure your operating in the factory apporoved rpm range at WOT. Good Luck BTW- I did this on my Montauk years ago and was amazed at the difference in performance betweend brands of props, due to the cupping and rake differences.
whalernut	posted 06-03-2000 07:18 AM ET (US) Thanks Bill, thats a great idea and will give it a go! Regards-JACK.
jimh	posted 06-07-2000 08:38 AM ET (US) Having a tachometer is an important factor in determining proper prop choice. It is also handy to have when you have a guest at the helm: you can tell them "Just run at so-and-so RPM" and they'll be more comfortable about throttle setting. If the console on the Currituck is like the one on my Sport, there is no good place to mount a tachometer. See http://continuouswave.com/whaler/reference/15/models.html for my solution: a sloping extension to the dashboard. --jimh
whalernut	posted 06-07-2000 06:31 PM ET (US) Thanks Jim, I am haveing one installed as we speak, because the shop that is tuning my engine up recommended it for proper performance and monitoring it! Regards-Jack Graner.
wds	posted 06-25-2000 09:26 AM ET (US) We have a 1977 85 HP Johnson on a 17'. A 15" steel prop is fine for water skiing, but limited on the top end at about 30-33 mph. I's suspect a 17" or 19" will be ideal from a power point of view, but it make move too fast for trolling. There's a plastic plate available (forget the proper name) that attaches to the cavitation plate and can be lowered with a control string so it's vertical directly behind the prop. This slows the boat down considerably at idle for trolling.
whalernut	posted 06-26-2000 04:48 PM ET (US) Thanks wds, I am not sure what pitch prop is on my Currituck, but I may try a 15" prop. If that doesn`t slow it down enough, I`ll try the fish troller divise you mentioned. Regards-JACK.