2013 5th Annual Sailnet Chesapeake Rondevous- June 8, 2013 - Page 9 - SailNet Community

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Go Back   SailNet Community > Out There > Destinations > Chesapeake / Central US east coast > Chesapeake Bay
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  #81  
Old 01-27-2013
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Re: 2013 5th Annual Sailnet Chesapeake Rondevous- June 8, 2013

brokesailor is absolutely right:

From Eldridge Tide and Pilot Book 2013, p 150.

EAST Flood Starts

June 6th Friday: 3:40 a.m., 3:10 p.m., predicted velocity after a.m. 2.0 knots

WEST Ebb Starts

June 6th Friday: 10:08 a.m., 8:56 p.m., predicted velocity after p.m. 2.3 knots
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Last edited by jameswilson29; 01-27-2013 at 08:55 AM.
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  #82  
Old 01-27-2013
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Re: 2013 5th Annual Sailnet Chesapeake Rondevous- June 8, 2013

From Eldridge Tide and Pilot Book 2013, p 150.

EAST Flood Starts

June 7th Saturday: 4:20 a.m., 3:52 p.m., predicted velocity after a.m. 2.0 knots

WEST Ebb Starts

June 7th Saturday: 10:54 a.m., 9:29 p.m., predicted velocity after p.m. 2.4 knots
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Last edited by jameswilson29; 01-27-2013 at 08:56 AM.
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  #83  
Old 01-27-2013
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Re: 2013 5th Annual Sailnet Chesapeake Rondevous- June 8, 2013

3rd thoughts, jameswilson is correct, though slack at the Delaware river end varies by up to an hour by station, Reedy Point radio tower, to 1.1 miles east of jetty, to bulkhead shoal at Delaware City.

We should leaving Essington June 7 before noon about 2 hours before ebb, in the flood meeting the ebb before Cherry Island ( 4:30 PM max ebb at Cherry Island -1.5), to allow entering the C&D before 5:30 PM closer to 4:00 PM if possible to ride the flood arriving well before sunset at 8:30 PM but not later than the start of Chesapeake City ebb at 9:30 PM.

A 2 knot opposing current means I would be doing 2 knots, a 2 knot favorable current means I would be doing 6 knots, a big difference for me.

Latest possible time to enter the C&D to stay in flood would be 6:30 PM which would allow for a later departure from Essington.
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  #84  
Old 01-27-2013
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Re: 2013 5th Annual Sailnet Chesapeake Rondevous- June 8, 2013

Quote:
Originally Posted by brokesailor View Post
Take 5: I thought the C&D Canal flooded from the Chesapeake and EBB'd toward the Bay.
(Eldridge)
I went back to figure out my confusion. NOAA lists two separate sensors located 0.01 minute of latitude (~60 feet) apart from each other:

Chesapeake and Delaware Canal Entrance 15d 39° 33.63' 75° 34.20'
Flood Direction, 264 True. Ebb (-)Direction, 087 True.

Reedy Point Radio Tower, south of 19d 39° 33.62' 75° 34.20'
Flood Direction, 078 True. Ebb (-)Direction, 263 True.

Interestingly, the current preductions are not exact mirror images of each other, so it would appear that they are totally different sensors.

After looking at a whole bunch of sensors on the canal, I realized that every single one of them defines flood as coming from the Chesapeake. The C&D Canal Entrance is the only one that is the opposite. My confusion resulted from the fact that I look at the C&D Canal Entrance sensor more than any other, and did not realize that it was the sole outlier. In the future, to avoid confusion, I'll use the Reedy Point Radio Tower instead of C&D Canal Entrance.

However, my observations of the effects of current on travel time are unchanged by this. It's just a little easier to explain now with all the sensors defined the same way.
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Last edited by TakeFive; 01-27-2013 at 01:36 PM.
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  #85  
Old 01-27-2013
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Re: 2013 5th Annual Sailnet Chesapeake Rondevous- June 8, 2013

I could be wrong about all this, so I'm posting again to make my point as clear as possible. I hope I am wrong - feel free to show me where my errors are.
Quote:
Originally Posted by Ulladh View Post
3rd thoughts, jameswilson is correct, though slack at the Delaware river end varies by up to an hour by station, Reedy Point radio tower, to 1.1 miles east of jetty, to bulkhead shoal at Delaware City...
Yes, his numbers seem to agree with mine give or take an hour. And that hour difference can be explained by the effect of approximating the whole canal's current with a single number instead of NOAA's multiple stations. I'm probably guilty of over-complicating this by looking at too many current stations.
Quote:
Originally Posted by Ulladh View Post
...to allow entering the C&D before 5:30 PM closer to 4:00 PM if possible to ride the flood...
This is where you lose me, because James and I both show the current in the canal turning against us starting around 4 pm, and getting worse after that. Entering the canal between 4 and 5:30 pm looks to me like it would be the worst time. We'd be opposing the flood (eastward flow as James pointed out), not riding it.
[EDIT: Oops, I just realized that "ride the flood" probably refers to sailing down the Delaware, not through the canal. I agree that we want to get close to the canal entrance before the Delaware River current opposes us too strongly.]
Quote:
Originally Posted by Ulladh View Post
...arriving well before sunset at 8:30 PM but not later than the start of Chesapeake City ebb at 9:30 PM...
While it would be nice to arrive before sunset, the Chesapeake City ebb helps us because it's toward the west. Arriving before 9:30 means fighting the current the whole way though the canal. After 9:30 the current favors us. The tradeoff is having to find a spot to anchor in pitch dark.

My concern is that when I run the numbers on my spreadsheet for your boat's motoring speed, arriving before dark looks to be impossible. So if we'll be in the dark anyway, we might as well take a break at Delaware City and wait it out for easy, fast motoring.
Quote:
Originally Posted by Ulladh View Post
...A 2 knot opposing current means I would be doing 2 knots, a 2 knot favorable current means I would be doing 6 knots, a big difference for me...
This is why I was so concerned about it. I can motor 5.5 kt SOW with ease, so my swing is 3.5 to 7.5 kts. 3.5 knots still mean a 3-4 hour transit for me. 2 knots could mean a 6 hour transit for you, which means you'll be effectively waiting out the current change while burning a lot of fuel.

Quote:
Originally Posted by Ulladh View Post
...Latest possible time to enter the C&D to stay in flood would be 6:30 PM which would allow for a later departure from Essington.
I think I created much of the confusion of "flood" vs. "ebb," since it's defined in opposite directions on different current stations. But my NOAA predictions show that the current at the canal entrance goes against us from 4 pm to 9 or 10 pm, and with us after that. James' numbers show pretty much the same thing.

This whole analysis is a great learning experience for me, so thanks for guiding me through it. We've got 4 months to figure this out - I'll try not to take up the whole time with this exercise.
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Last edited by TakeFive; 01-27-2013 at 01:50 PM.
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  #86  
Old 01-27-2013
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Re: 2013 5th Annual Sailnet Chesapeake Rondevous- June 8, 2013

Maybe its time to start a new thread? Just say'in
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  #87  
Old 01-27-2013
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Re: 2013 5th Annual Sailnet Chesapeake Rondevous- June 8, 2013

Quote:
Originally Posted by T37Chef View Post
Maybe its time to start a new thread? Just say'in
Yeah, I shoulda thought of that before. Please post responses on the topic of C&D Canal currents here.
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  #88  
Old 01-27-2013
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Re: 2013 5th Annual Sailnet Chesapeake Rondevous- June 8, 2013

Whew, thought I was going to have to post a a sail plan.
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  #89  
Old 01-27-2013
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Re: 2013 5th Annual Sailnet Chesapeake Rondevous- June 8, 2013

Quote:
Originally Posted by T37Chef View Post
Dave, you got us down for slip correct? Havent heard anything
Yep you are taken care of. Sorry I didnt answer
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Old 01-27-2013
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Re: 2013 5th Annual Sailnet Chesapeake Rondevous- June 8, 2013

Quote:
Originally Posted by chucklesR View Post
Whew, thought I was going to have to post a a sail plan.
Sail plan...from the Magothy...finger in the air...figure out wind speed...crack beer....avoid Dobbins...crack another beer......go through the inlet....hand over to Mary...sail north... when you see the steel mill....have lunch,,, when you see the white rocks....shoot between them...
Dock safely.....Then have fun.

Thats all the sail plan you will need
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Last edited by chef2sail; 01-27-2013 at 05:22 PM.
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