Oday 25 rigging question..

Douginmd

Douginmd

.
Feb 16, 2017
31
Okay 25 North East Md
I have a (new to me) Oday 25 that has adjustable blocks on the port and star board sides which is aft
of the winches. Are these for the jib sheets to run through and if so how in conjunction with the winches are they to be used?
 
cb32863

cb32863

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Jun 29, 2010
1,287
Beneteau First 235 Lake Minnetonka, MN
If they are way aft, like I think they are, they are used for spinnaker sheets. There should be a block near the chainplate/shroud connection for your jib sheets. Pics would help.
 
Douginmd

Douginmd

.
Feb 16, 2017
31
Okay 25 North East Md
cb32863 said:
If they are way aft, like I think they are, they are used for spinnaker sheets. There should be a block near the chainplate/shroud connection for your jib sheets. Pics would help.
Click to expand
The jib is a large genoa...If the block is used for the genoa or for a spinnaker (which I don't believe the previous owner ever had) would you run the sheet through the block first and then around the winches or around the winches and then back through the block?
 
Joe

Joe

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Jun 1, 2004
8,323
Catalina 27 Mission Bay, San Diego
Are you able to move the blocks? Are there any other sets of blocks that could be used as jib leads for a smaller sail? Does the sheet, from block to genoa clew, look like it bisects that corner of the sail? If it doesn't, can you find a position that allows it? That's what you need to know.
 
Douginmd

Douginmd

.
Feb 16, 2017
31
Okay 25 North East Md
Joe said:
Are you able to move the blocks? Are there any other sets of blocks that could be used as jib leads for a smaller sail? Does the sheet, from block to genoa clew, look like it bisects that corner of the sail? If it doesn't, can you find a position that allows it? That's what you need to know.
Click to expand
The blocks can be moved about 18-24" forward and aft beginning about 12" behind the winches.
What do you mean "bisects the sail?"
 
Joe

Joe

.
Jun 1, 2004
8,323
Catalina 27 Mission Bay, San Diego
Douginmd said:
The blocks can be moved about 18-24" forward and aft beginning about 12" behind the winches.
What do you mean "bisects the sail?"
Click to expand
If you extend a line from the sheet through the clew (the corner of the sail connected to the sheet) that line should bisect the corner angle... in other words, there will be equal tension on the foot (bottom edge) and the leech (following edge) ..... this would be your neutral, starting position. If conditions warrant a fuller... or flatter... sail, moving the block forward or aft will change the relative tensions of the two sides.
For simplicity, the neutral position can be marked on the jib car track for quick reference and easy communication. You can then instruct the crew to move the car relative to the neutral pin hole. On my boat the pin holes are numbered.... that helps consistency on both sides.
 
jibes138

jibes138

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Jan 27, 2008
3,092
ODay 35 Beaufort, NC
Don Gillette sells a little book on sail trim on this site that is a wonderful instruction on how to use the equipment on your boat to properly adjust your sails. I highly recommend you pick up a copy. Sail trim is a continuous process as wind conditions change and your point of sail changes. It's a lot of fun to see how adjustments effect boat performance.
 
geehaw

geehaw

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May 15, 2010
231
O-day 25 shoal keel Valdez
You should have blocks near the chain plates for the jib. The rear track and block is for a genoa. Not sure all 25's have it but I have block at the aft corner on each side of the boat. I run the genoa sheet through the block on the track then back to the rear block and then to winch. But either way the sheet should go through the block on the track first.
 
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