Pinned by a T-Storm Downdraft
A couple of years ago I was coming back from the Isles of Shoals in my 05H36 when I noticed a very dark cumulo-nimbus coming out to meet me. Its radar image was a more solid yellow than the shore return, with lots of blue to either side (where I could see rain curtains), so I 3-reefed the main and took in 10 turns on the jib, planning to feather into it.
As it got to me, I started feeling a little cocky about how well I was doing with wind machine readings up to 48kts, when a sudden downdraft of more serious wind (and water) came straight down on my head. The wind direction got chaotic and the jib back-winded, spinning Persephone around where these winds pinned her on her port side and held her there. (The blow-dried weather-person later referred to "several thunderstorms with over 60mph gusts.")
While I was crawling along what had been the side of the cockpit to reach and release the cabin-top halyard winch, the boat just calmly fore-reached as nice as you could ask for, with water only reaching the side deck and the cockpit as dry as a bone. (Let's hear it for broad-sterned Glen Henderson designs with "too much freeboard.")
Once I released the halyard, Persephone righted herself as if nothing had happened, and we headed up and feathered (in an entirely new direction from before) until the winds died down. I now have a lot more faith in her (and more respect for T-Storm downdrafts).
Masochistic Reverse Nantucket Sleigh-ride
The week after the Fugawi race weekend is a great time to sail the Vineyard and Nantucket, with few crowds, no need for dockage reservations and cheap rates. This season, our clever captain (yours truly) scheduled our return from Nantucket to Vineyard Haven to coincide with the ebb in Nantucket Sound, so as to get a 2kt westward speed boost, shortening a 4hr trip.
Unfortunately, Captain Clever didn't count on 20-25kt westerlies gusting to 30, and what that would do against 2 kts in such a shallow body of constricted water. The answer, students, is 4-6ft chop (i.e. 4-6 second wave period) holding my 7.5kt boat to under 4 kts when motor-sailing into it at full RPMs.
While the boat did quite well, after 7 hrs of this we were very glad to tie up at Black Dog Wharf. Rick, the surfer-dude dockmaster, said "well, aren't you hardy sailors. I was out with my board off East Chop, but it was too rough for me." I gamely tried to smile, but the look my wife shot me said "you really owe me for this one." Once again - what the boat can take is not necessarily what the crew can take.
Downwind is Different
This September 25th, as came out of Portland's inner harbor on our way to Kennebunkport, the cold front that had come in overnight was giving us a steady 25kts on the nose, and staring to build some really nasty chop. By the time we rounded Cape Elizabeth with the wind dropping back to our port quarter, the waves had built to 3-5ft and growing.
However, once we reached our 7.5kt hull speed (under 3-reefed main and most of our little 110% jib out), what had been waves with a 5 sec (or less) period became apparent swells with almost twice that period. They continued to grow in magnitude (4-6), but that made little difference (although I did have to hand steer to avoid any unpleasant autopilot changes in heading). We made good 30nm dock-to-dock to Chick's Marina in 4hrs and 10min. Nice.
Persephone's Limits (and mine)
Since my eye-level when standing at the helm is 8ft above the waterline, I don't mean to imply great accuracy in mentioning waves higher than that. If they are swells and the shore disappears in the troughs, I can only guestimate based on my lifeline heights/spacing.
However, last year's trip up to Maine had that happening as we passed Richmond Island, with my estimate being 10-12ft. I've learned that wave period in relation to height is much more important than absolute height. The aforementioned seas were just swells, and it doesn't take long to relax and enjoy them. On the other hand, 5ft seas with 5sec period can beat you to death, even though with a 10sec period they are hardly worth mentioning.
With the custom sails I had Doyle make for me when I ordered Persephone, I have verified that they did, indeed, meet my specification of "good for anything between 3 and 30kts."
I don't volunteer for more than 6ft seas and 30kt winds, but have exceeded both with the boat having far more in reserve than me. However, "it's not the wind, it's the seas."
Fair winds,
Al
s/v Persephone