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Author Topic:   Cavitation Plate Height
RCarbon posted 03-03-2004 11:32 AM ET (US)   Profile for RCarbon   Send Email to RCarbon  
Is there a standard formula to calculate the correct setting of a cavitation plate above the bottom transom edge? I believe I heard every inch of of setback (distance between the leading edge of the lower unit and the transom) you raise the cavitation plate 1/4". A 6" setback would allow the cav. plate to be raised 1-1/2" above the bottom of the transom. Does this sound right?
Sal DiMercurio posted 03-03-2004 11:49 AM ET (US)     Profile for Sal DiMercurio  Send Email to Sal DiMercurio     
No, there really isn't a set formula.
The reason is, some props, such as stock just off the shelf oem props, will blow out at or above a certain height, where performance props & surface piercing props can be run much higher, without venting or cavitating.
Bigshot posted 03-03-2004 01:34 PM ET (US)     Profile for Bigshot  Send Email to Bigshot     
Cooling is also an issue. I have a 5" setback and I am about 3-4" ABOVE my drain hole. So almost 6" from bottom edge on my 17'. Suzukis like to run high olus they have 3 water intakes and I guess my OEM SS prop is more on the performance side because she does not blow out unless I try.

It is nice having 6" less of a draft. I puzzle myself sometimes running the flats, especially when the water is real clear. I am whitenuckled thinking I am gonna hit ANY second being I am in less than 18" of water.

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