plug in all the numbers, except the prop pitch, and use 10% as your slip
that prop has a very aggressive cup, and it may be labeled as a 19, but the cup makes it in reality a 22 pitch, and a 22 pitch will provide the performance numbers you are reporting
www.teamcharlestonmarine.com
www.joinrfa.org
IF I RESPOND IN ALL CAPS, ITS NOT ON PURPOSE, AND I AM NOT YELLING
prop companies lie about the pitch of their props, it makes their 19 pitch prop “faster” than their competitors. Generally Mercury props are the most accurate and consistant. Mach propellers were notoriusly off from their numbers. Most high performance guys have theor prop blue printed before they ever put it on the boat, so they know what they are dealing with. Blue printing checks the prop pitch, diamter, and suface area on each blade, then the blades are adjusted so they are as close to each other as they can be. Then the prop is run and its performace frecorded and compaired to the other props that have been run. If you are changing brands between prop changes, theres no telling what you have compared to each other.
BTW, if you like 61 in a 16 footer, 103mph in a 17 footer is that much more fun
quote:
Originally posted by chris Vplug in all the numbers, except the prop pitch, and use 10% as your slip
that prop has a very aggressive cup, and it may be labeled as a 19, but the cup makes it in reality a 22 pitch, and a 22 pitch will provide the performance numbers you are reportingwww.teamcharlestonmarine.com
www.joinrfa.org
IF I RESPOND IN ALL CAPS, ITS NOT ON PURPOSE, AND I AM NOT YELLING
And that is why I told you all I could care less about that prop calc. It’s a TOOL
It is not the Gospel. It is a tool to ESTIMATE some things. It doesn’t take into account any of these variables.
The only real way is to try them out and see.
Wadmalaw native
1999 16’ Bentz-Craft flats
1994 16’ Bentz-Craft flats
15’ Alumacraft, 1979 35 Johnson
ISLAND ARMORY, LLC - CONTACT ME FOR ALL OF YOUR FFL NEEDS!
quote:
It is not the Gospel. It is a tool to ESTIMATE some things. It doesn't take into account any of these variables.The only real way is to try them out and see.
</font id=“quote”></blockquote id=“quote”>That is a fact. Finding the best prop for any boat is about half math, half trial and error, and a little bit of black magic. I went through 5 on my boat before I found the best, and if I tried 5 more I might find a better one yet. Reach a point where it’s good enough.
Capt. Larry Teuton
Swamp Worshiper
And that’s where I am finally. Now the pain of ordering a $400 prop…and a hub kit!
Wadmalaw native
1999 16’ Bentz-Craft flats
1994 16’ Bentz-Craft flats
15’ Alumacraft, 1979 35 Johnson
ISLAND ARMORY, LLC - CONTACT ME FOR ALL OF YOUR FFL NEEDS!
quote:
Originally posted by Lawmanquote:
Originally posted by leadenwahboyThat was a Havoc, boat built in Arkansas. It FLIES!
There is only one of those around here with a 90. I always wondered how that thing ran.
Put twice the rec. HP on any boat and I bet it will fly. Seen way to many friends get hurt running 15’-16’ boats in the rivers going 60+ mph. Not worth it IMO.
“Wailord”
1979 17’ Montauk
90 Johnson
Wilderness Ride 115
For the record, the Bentz Craft came from Robert with a 90 Yamaha on it. If you’ve ever been in one, you’d know that it is perfect power to weight, without being unstable at WOT.
The Havoc on the other hand…
Wadmalaw native
1999 16’ Bentz-Craft flats
1994 16’ Bentz-Craft flats
15’ Alumacraft, 1979 35 Johnson
ISLAND ARMORY, LLC - CONTACT ME FOR ALL OF YOUR FFL NEEDS!
Yeah, I wasn’t referring to the Bentz Craft. Though that is a small boat for a 90, it is still set up with better chines and pad than a lightweight aluminum boat. I doubt it can handle any 90 hp motors made today. a 70 Yamaha is likely the motor of choice if you ever had to repower new.
“Wailord”
1979 17’ Montauk
90 Johnson
Wilderness Ride 115
I will never put a 4 stroke on these boats.
The 16’ with the 70 is pretty slow…I have enough parts laying around to rebuild the 90’s a couple of times hopefully.
Wadmalaw native
1999 16’ Bentz-Craft flats
1994 16’ Bentz-Craft flats
15’ Alumacraft, 1979 35 Johnson
ISLAND ARMORY, LLC - CONTACT ME FOR ALL OF YOUR FFL NEEDS!
That havoc with the 90 takes balls to drive!
Ive run outta sick days, im calling in dead!