Prop Suggestions -- general ball park....
I'm looking for suggestions, knowing there can be no science or hard answers....350 ci Carb'd engine
23' cuddy cabin boat
4100lbs Current prop is a SS 14x19
Old prop (I'm assuming, becuase it was on teh boat) is alum 14x17 I don't know the WOT RPM as the outdrive is currently off; but want to get an
approximate or good starting prop for 1st sea trial. I heard the current SS prop was hard to get up on a plane, had to be going
fairly fast, and once on plane, dropping off the throttle, it'd drop back off
plane. Discussion, suggestion, etc is appreciated.
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Josh
Oct 25
2006
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| I saw that -- doesn't go back to 92; and picking 2000 & going thru it; it tells
me: Errors
Application outside of current selector limits. Please see your local Mercury
dealer or visit the Ask Mercury section of our website. Thanks
-josh |
Josh
Oct 26
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| I have a 22.5 foot 2000 crownline 3600lbs 280hp with a EFI 350 cid
mercruiser and run a 19X14.5 prop.. w/19degree deadrise hull at the transum. Planes fast and tops out at 56mph wot. If you are looking for a better whole shot I would consider th 17 inch
pitch. Not really sure what you are looking for performance wise.(nore
whole shot or top end, Or the HP rating of your powert plant. Capt Jack R.. |
Jack
Oct 26
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| 23' boot, 4100 lbs, 260 @ the prop. 350ci 4bbl carb I'm looking for best cruising/commuting fuel usage. Thanks
-josh |
Josh
Oct 25
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| Thanks! I know about the differences between ss and alum
I know in the past, I've seen not much difference between AL and SS when engines
are low in HP. It wasn't so much the material; bu the fact that two different
props existed. If it were me; I'd have an alum to "experiment" with and then once figured out;
go SS for the longevity.... I'll stick with the current prop & go from there. Cheers!
-josh On Thu, 26 Oct 2006 00:28:50 GMT, Short Wave Sportfishing
<fivesixseven@eight.com> wrote:
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Josh
Oct 25
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| can't do much without knowing WOT of current prop. But if it had a 17p
before I would go for a 14.5 x 17SS. The extra diameter should help getting
up and going due to having more blade area. "Josh Assing" <XjoshX@jassing.com> wrote in message |
Lost
Oct 25
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| Hmmmm.... Assuming you can get one to try, you might want to try a four blade
14"x17p SS prop - that will get you out of the hole guick and give you
some real bite while cruising. I switched from a 14.5x19 three blade to a 14.5'x19 four blade and the
difference was startling - in fact, it turned the Ranger CC into a
whole different boat. Plenty of bite out of the hole, terrific
efficiency and it gave me something I've never had on that boat, lots
of bow lift. Consider a four blade. |
Short
Oct 26
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| I have a comparable boat, slightly heavier, that runs
a 3 bladed 15 x 17. Don't know if its optimal but it seems about right. |
Wayne.B
Oct 26
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| Out of curiosity, have you tried any other prop? |
Short
Oct 26
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| Interesting, I had always believed a 4 blade is less effecient fuel wise as it
has more drag. and the less blades is hte most effecient. If balance could be
worked out a 1 blade is "ideal" . I can't recall where I read that; but it was
from multiple sources.... I'll check out a 4 blade, worth a try anyway. Thanks
-j |
Josh
Oct 26
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| Great; thanks wayne. On Thu, 26 Oct 2006 10:16:12 -0400, Wayne.B <waynebatrecdotboats@hotmail.com>
wrote:
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Josh
Oct 26
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| I had a spare for awhile that was something like 14 1/2 x 17. It
didn't seem to make much difference. |
Wayne.B
Oct 26
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| MerCruiser has a prop selector at
http://appcenter.mercurymarine.com/propSelector/home.do;jsessionid=431ce3282fa14b8ca160be9a7bf666c2.n6XIsAyIpkjMmQPvqAzIngTxpQOUaN0Ka3D3lN4RawSMaMSK-x8L-x8Kn6bycgTAn38Lb65Abx4M-wOSa30K8Nzta5WN-AfJpBDD-APzqAbHml9DpAiImQXH8N4QbNmKaMbCpQPz8QvJpkixn6jAmljGr5XDqQLvpAe_
that might be of interest. "Josh Assing" <XjoshX@jassing.com> wrote in message |
Bill
Oct 26
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| call your local prop shop mine here in Iowa has domo and loaners to try for
free if returned with no damage. |
Chad
Oct 25
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| I'll check them out -- good idea.
Tacoma Prop here has (previously) taken back (exchange) props. I live on an island tho, so "testing" tends to be a pain -- wanted a general
ball park idea to start with & then be able to adjust.... Cheers
-josh |
Josh
Oct 25
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| Start with the 14x19 and go from there. A two step increase/decrease
is a pretty common circumstance and usually done to maintain both
cruising and WOT rpms. Stainless props flex less than aluminum, generally have a longer life
and considerably more hydrodynamic efficiency derived from the stiffer
blades. They are easily repaired, but the repairs can be expensive.
Less than a new prop though. Aluminum props are relatively low in cost, have good strength, good
corrosion resistance and are easily repaired. On the other hand, they
are easily damaged, suffer a lot of dings and what not and can suffer
from electrolysis problems. I'm not sure where the dropping off throttle drops plane comes from.
Once the boat is on plane, backing off the throttle doesn't affect
much at all other than efficiency. Doesn't have much to do with the
material the prop is made of. If it were me, I'd just leave the SS prop on it and try that first,
then play with other props if you aren't satisfied. |
Short
Oct 26
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