Join Date: Nov 2007
Location: SF Bay area
Thanked 7 Times in 6 Posts
Rep Power: 9
How much does heel contribute to weather helm? Since the theoretical hull speed is based on water line, will the leeward side (with a longer longer line) not be able to generate more speed than the windward side; ending in a round up?
I think not, not until you're going fast enough that the leeward side can take advantage of the longer waterline. I have experienced weather helm when my boat speed was much lower than my theoretical hull speed.
Instead I think that weather helm due to heel is primarily a result of the fact that the COE of the sails is no longer over the centerline of the boat, adding a moment to the forces on the boat. This moment will always tend to turn the boat away from the side the rig is on.
This effect will be present regardless of boat speed.
s/v Laelia - 1978 Pearson 365 ketch
s/v Essorant - 1972 Catalina 27