Question:
I am sailing an Express, and there are some vibrations in the hull when the
boat achieves a certain speed. Is tension in the hull the reason ? Does this
reduce the speed, and if so, what can I do ?
Answer:
- It is most likely tip vortex turbulence from the keel and/or
rudder that you feel. This is not abnormal and, although it
does cause some drag, there is nothing much that can be done
about it. About the only thing that reduces tip votices to
unnoticable levels is a very high aspect ratio appendage. I'm
talking narrow (two or three feet) and deep (12-15 feet). Most
keels and rudders are a compromise in order to not have
prohibitive draft and vortex-related vibrations are a
consequence.
Don't worry about your speeds being reduced as an Express (30
I would guess) is not very fast to begin with. I have
outdistanced a couple of them with my Coronado 27.
- First of all, what Express? California or Canada? 20, 27, 30, 30M, 34, 35,
37?
At what speed? Is it in the rigging or actually in the hull? If in the
hull, from the keel, or from the rudder? Motoring or sailing?
How about a little more detail.
