cavitation plate add ons

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Darryl34

Petty Officer 3rd Class
Joined
Mar 14, 2004
Messages
86
what exactly do those plastic extansions do that you bolt on?Is this to keep the bow down at slower speeds?Newbie question.
 
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honda21

Recruit
Joined
Apr 3, 2004
Messages
4
Re: cavitation plate add ons

these can serve two purposes: the first being to stabelize the transom more while driving, and the second purpose is that it can be bend down to a 90 degree angle to cause more drag, and more drag equalls slower speeds on the boat<br /><br />hope this helps
 
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andrewkafp

Lieutenant Commander
Joined
Mar 15, 2003
Messages
1,668
Re: cavitation plate add ons

This is the theory, whether in air or water.<br /><br /> http://cavity.ce.utexas.edu/~kinnas/uti99/node2.html <br /><br />Mine (on a 50hp) really only assisted in keeping the steering straighter while moving slowly<br />(under 5 knots), however, there are some good raps from some members on iboats. Perhaps it's horsepower related.
 
JB

JB

Honorary Moderator Emeritus
Joined
Mar 25, 2001
Messages
45,907
Re: cavitation plate add ons

Moving to General Outboard
 
Jdeagro

Jdeagro

iboats.com Partner
Joined
Jul 30, 2003
Messages
1,682
Re: cavitation plate add ons

Honda21 is talking about a trolling plate (happy troller), what you are inquiring about is a Hydrofoil planning device. Do a search on hydrofoils on this site. There is plenty to read.
 
C

cp

Petty Officer 1st Class
Joined
Feb 1, 2004
Messages
367
Re: cavitation plate add ons

Like Unicorn says, those fins are intended to provide lift to help the boat get on plane and stay on plane easier at less throttle. They're more effective at higher speeds when they provide more lift, as shown in Unicorn's diagram, but keeping in mind their small area versus the overall weight of the motor and stern of the boat, they may make no noticeable difference if used on a 20' boat packing a 500# four-stroke, for example. Unicorn - do you have any numbers as to the amount of lift, e.g. xx pounds of lift per sq. inch of foil at yy knots?
 
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