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Old 09-05-2013, 04:10 PM
xz3ltt xz3ltt is offline
TT Newbie
Join Date: Mar 2013
Boat: 1988 prostar 190
Location: midwest
Posts: 21
1988 Prostar 190 cavitates when pulling a skier and "turning"

love the boat. BUT when the wife is at the end of the lake and turning for a return run (we always turn to the right), the boat "cavitates". It does NOT do it when she makes a W-I-D E turn, or when she is skiing (im at 185 lbs,,,she's alot less), or when im just getting out of the water.

I tested with two "known good" props, so thats not the issue.

Have validated that the direct drive is full of trans fluid.

Kinda thinking bad clutch plates, but its somewhat hard to beleive that it..because theres more drag/resistance when getting me out of the hole.

Based on the articles in this forum, im thinking to pull the direct drive over the winter months and rebuild.

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Old 09-05-2013, 04:23 PM
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mustangtexas mustangtexas is online now
MC Fanatic
Join Date: Sep 2012
Boat: 2005 MasterCraft Prostar 197 & 1989 190
Location: North Texas/St. Germain, WI
Posts: 666
Cavitation (which is often confused with ventilation) is a phenomena of water vaporizing or "boiling" due to the extreme reduction of pressure on the back of the propeller blade. Many propellers partially cavitate during normal operation, but excessive cavitation can result in physical damage to the blade surface due to the collapse of microscopic bubbles in the metal.

There may be numerous causes of cavitation such as incorrect matching of propeller style to application, incorrect pitch, physical damage to the blade edges, etc...

Be advised disturbances in the water flow forward of the propeller can result in blade damage which appears to be blade cavitation, but is actually due to non-favorable water flow.
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Old 09-05-2013, 11:53 PM
Greenwood87 Greenwood87 is offline
TT Enthusiast
Join Date: May 2013
Boat: 1989 Mastercraft Tri Star 190
Location: Southeast
Posts: 111
My boat does this with a perfect prop also. I attribute this to the angle of the rudder to the prop.
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Old 09-06-2013, 02:28 PM
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190 Skier 190 Skier is offline
TT Regular
Join Date: Sep 2010
Boat: MasterCraft, PS 190, 1990, 351 windsor
Location: Northern CA
Posts: 43
My boat had this occur last year as well, only on a tighter turn. It was the tranny slipping not the prop cavitating. Had it rebuilt and found the clutches were well worn. Not an issue since the rebuild.
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