Snip lots of discussion about cavitation, ventilation or whatever: Interesting thread...
I've noticed similar problems to Terry's on Locksley, particularly the rudder vibration at the top end of normal cruising range (1300 revs or so) on shallow canals. I noticed some slight play in the bearing where the rudder stock goes through the counter, and replaced a rubber 'O' ring last autumn. This tightened things up a bit and all was well for a few months, but now the problem is back again. I think the diagnosis of air being drawn in right. Whenever I've been river cruising, I've noticed frequent low rumbling noises (the kind an elephant would make in the bath I should imagine!) coming from the general area of the propeller. I'm not sure whether ballast will solve the problem though, the counter base plate is normally well below water level. Still , it's worth a try, I've got a few surplus lumps of steel at the pointy end that I can move back. Oh, and on the 'cavitation vs ventilation' issue, take a look at: http://www.powerboat-training.co.uk/articles/articles-propellers-ventilation,%20cavitation.htm No idea if it's right or not, but it sounds authoritative to me. -- Robin - nb Locksley Yahoo! Groups Links <*> To visit your group on the web, go to: http://groups.yahoo.com/group/canals-list/ <*> To unsubscribe from this group, send an email to: [EMAIL PROTECTED] <*> Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/
