Does the Hydrovane have difficulty in performing on longer keeled boats?
A long keel boat does have more directionally stability than a fin keel. Once trimmed and balanced it will hold its course better than a fin keel but conversely, once off course it does take more effort to get back on course. A big help to the steering of full keel boats is in achieving a well balanced boat which means attention to sail trim. A Hydrovane has no problem with long keeled boats – unless there are trim and balance issues that only need some attention.