The weekend report and several firsts

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Sep 20, 2006
2,953
Hunter 33 Georgian Bay, Ontario, Canada
This past weekend was Canada Day... eh, and since July 1 was Tues., meant taking Mon. off as well. :) Managed to get a few days of different types of sailing over the weekend and along with past weekends chaulked up a few more firsts for us on the boat. - set a new speed record for our boat 9.2 knots SOG GPS, on a run with jib out only and gusting to 25 knot winds along with a 2 ft. swell and surfing. - first time I went out solo. Went up to the boat a couple weekends ago to work on the boat, but it was too nice to stay in the marina ( life's too short to stay tied to the dock), cast off and singled out to Beckwith Island, dropped anchor and stayed the night, raised anchor and docked... all by myself, which compared to this time last year is a huge leap !! - went out past Mon. for a first evening sail. Had been out for a couple of days with friends on board and got back Mon. aft. exhausted. After they left and had showers, drinks and snacks we looked at each other and said there's no way were staying in the marina tonight ( 14 yr. old daughter was the instigator) Bonus was a 1 1/2 hour sail in 18-22 knots wind on a broad reach with full sails out *yks which was great sailing at steady 7 - 8 knots sailing until the wind shifted and put us into a beam reach.... got a little tense for a bit until I could release the jib and let out the main some more... was worth the ride tho. - first thinderstorm on the hook. Sat. night a thunderstorm blew in around 11:30 pm after we had gone to bed. Poked my head up into the cockpit, full enclosure, and flicked on the instruments ( steady 35 knots) and saw the red/green nav. lights of another boat headed our direction sideways. I hit it with a search light to see him on the bow scrambling with anchor lines. Rain lit up with the light was going in every which direction. Passed between us and a power boat within 50 ft. They managed to reset several hundred yards past us heading out into the main bay. ( this island is exposed to Geaorgin Bay and beyond the shelter of its cove your into open water. Anchor on our boat held fast, of course as it is a Rocna and I set it properly with pleny of scope ;) not to mention the other 16 boats in the anchorage held on Bruces and CQR's but that must have been pure luck ;D Just thought I'd post something about sailing instead of the usual mechanical issues.
 

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jviss

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Feb 5, 2004
7,090
Tartan 3800 20 Westport, MA
9.2 kts. in a 33?

You must have quite a current there! How long did you sustain 9.2 kts.?
 
Sep 24, 1999
1,511
Hunter H46LE Sausalito
figuring it out

hmmm. LWL on a 33 would be 27', which calculates [1.34 * (LWL)1/2 LWL] to 7 knots, which means you've exceeded theoretical hull speed by 131%, approximately. Yeah. I can see it happening for short bursts.
 

Joe

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Jun 1, 2004
8,319
Catalina 27 Mission Bay, San Diego
please, please......

you guys with the theoretical hull speed calculators give us a break. Did you read the post.... SOG means speed over ground.
 
Sep 20, 2006
2,953
Hunter 33 Georgian Bay, Ontario, Canada
no current or tide

just following waves and yes it was a very short burst, but fun. Speed indicator on boat read 9.4. And the LWL is 29'-5
 
Sep 24, 1999
1,511
Hunter H46LE Sausalito
oops, you're right

I must have been reading the spec sheet on the older 33. Let's see, that gives you a hull speed of 7.28, which means you were only exceeding by 126%. Definitely surfing, however. My guess is that your boat will remain stable up to 150%, which means that with good sail trim you won't have to worry about broaching until STW gets close to 11 knots. At that point you ought to be throwing a rooster tail, and it serves you right! My guess is that all the realtors are getting a bit grumpy in this market. But yeah, Joe, I certainly know what SOG means. Did you miss the word "surfing" in the original post? It's what happens when you're no longer in displacement mode. At that point, theoretical hull speed is highly relevant, especially on the type of boat you sail, which is not going to remain stable on a plane for very long in a following sea.
 
Sep 20, 2006
2,953
Hunter 33 Georgian Bay, Ontario, Canada
some white knuckles

I think I was maintaining well over 7 knots on the jib alone that day but wasn't as OMG as Mon. night when I had full sails out in the same area. I was crossing "the slot" between the mainland and an island that runs N to NW into Georgian Bay and produces a funnel effect and can be stronger and gusty than the rest of that area.
 
Jun 12, 2004
1,181
Allied Mistress 39 Ketch Kemah,Tx.
Scott...Dumb Question

How do you know there was not any current? I am not familiar with your sailing area, but Georgian Bay is quite large. Do you also have a speed log to compare to the GPS? The reason I ask is because if you are in a strong current, usually there is no other way of knowing because everything moves relative to it. Just curious. I have known sailors that made 12 knots SOG for sustained periods in the Gulf Loop Current. I on the other hand, have had my boat laying over prety good and felt like i was going like hell, but the GPS said 1K and sometimes 1.5K in the same Loop Current. Other than the GPS, there was no way of me knowing that there was an adverse current. As for Joe from Mission Bay " please, please...... you guys with the theoretical hull speed calculators give us a break". LOL I agree 100%. Tony B
 
S

Scott

Dumb question ... yes, tonyb

(just kidding!) There are no tides on the Great Lakes. Without tides, there are no tidal currents, either. There are currents, due to water flow through the lakes, but the effect is imperceptible in terms of the affect to the speed of boats. But then again, maybe I'm wrong!
 
Sep 20, 2006
2,953
Hunter 33 Georgian Bay, Ontario, Canada
Big lakes

Georgian Bay is a big bay off Lake Huron which is part of the Great Lakes. The only "current" to speak of goes through Detroit at St. Clair Lake and Detroit River where the US have opened a "big hole" in the lake according to GLCC, but that's another topic. No there is no tide and there is no current.... even if there was a current it certainly was not in the direction I was headed. I certainly did not mean for this to get into a huge discussion on theoretical SOG, tides, currents, GPS vs. SOG VMG etc. etc. I really can't remember if it was the chartplotter reading 9.2 or the Raymarine ST60 speed log reading 9.2, but what the he## it was fun and I did sustain well over 7 - 8 knots on the jib alone ( both GPS and Raymarine ) downwind, NO CURRENT, following seas, and surfing. ;D ..... and I've had a lot of fun the past few weekends having fun and doing new "firsts" on our new to us boat ;D
 
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