cavitation and ventilation

[riverbouy]

Looking at buying a new 21 foot bow rider I am considering the Chaparral 210. I test drove one (Volvo 5.0 mpi single prop) and was quite surprized to find prop ventilation driving straight at all planing speeds, simply by appling trim. The boat never porpoised as you would expect, it just cavitated - and ventilated. Has anyone else experienced this with a Chap? Alos found ventilation - trim completely down - coming out of a hard turn.

 

[AvidBoater.com]

Re: cavitation and ventilation

I have driven serveral 210's with merCruiser 5.0L Alphas, and have never expierienced any cavitation at straight plane, in extremly hard turns about any boat will have prop vent, although I haven't witnessed it with the 210. Did you buy a Chaparral 210 yet, they are fantastic boats.

 

[riverbouy]

Re: cavitation and ventilation

I tested the searay with the 5.0 Merc and found the same issue. You get cavitation before you get a lot of bouncing action in the bow. I expected to get a lot of bounce before cavitation. This is experienced above normal trim settings but not anything I've experienced before. I assume this is a result of the new boat building trends that are extending planing surface aft of the transom intended to get less bow rise and faster "time-to-plane" speeds. I think this is just a side effect.<br /><br />I bought the 210 with the 350-MPI merc, ordered it Feb 10, dealer says it is in today, give him two weeks to install the through hull exhaust, wakeboard tower and "perfect pass".