CD 27 Working Load on Genoa Blocks?
Moderator: Jim Walsh
-
- Posts: 150
- Joined: Dec 3rd, '05, 23:09
- Location: CD 27 (1977) "ABIGAIL"
City Island, New York
CD 27 Working Load on Genoa Blocks?
Can anybody give me an approximate minimum safe working load I should have in mind in shopping for new blocks for my 140% genoa sheets. Believe it or not, I have still been using what I think must be the original CD snatch blocks, which have 2" dia. sheeves. They carry no name or number code. The manual says original 27 and 28 genoa blocks were Schaefer 07-83, but I can't correlate that to model numbers on Schaefer's current products. These blocks get very expensive fast as one moves up the size scale, so I want to avoid overkill. Thanks.
Bob
Bob
-
- Posts: 188
- Joined: Feb 8th, '05, 11:12
- Location: 27' Cape Dory (Alerion),
9' Dyer,
Grosse Pointe, Michigan
This be the one...and yes, inflation has taken it's toll
As I recall, the CD27 has 1" t-track...take a look at the following URL...or maybe you could be patient and watch eBay for a better deal?
http://schaeferhardware.com//detail.aspx?ID=1281
http://schaeferhardware.com//detail.aspx?ID=1281
Possible Alternative
I believe Garhauer Marine has one for less than $50.00. You might, also, consider car with snatch block.
MY CD 28 is a '79 and it still has its original genoa sheet blocks. They are Schaefer 5 series, not 7 series, and they work fine. If Cape Dory started specifying 7 series blocks, I think it must have happened sometime after my boat was shipped.
Wichard has published load charts for most Cape Dorys, including the 27.
http://www.wichard-usa.com/Boat%20pages ... 20page.pdf
Wichard has published load charts for most Cape Dorys, including the 27.
http://www.wichard-usa.com/Boat%20pages ... 20page.pdf
-
- Posts: 150
- Joined: Dec 3rd, '05, 23:09
- Location: CD 27 (1977) "ABIGAIL"
City Island, New York
Immensely Helpful
Just what I needed, Stan. Thanks very much.
Bob
Bob
- Warren Kaplan
- Posts: 1147
- Joined: Feb 5th, '05, 11:44
- Location: Former owner of Sine Qua Non CD27 #166 1980 Oyster Bay Harbor, NY Member # 317
Harken Load calculations
Here is something that I found quite useful when picking new hardware that would be under load. Scroll down and look at it all. You may be able to calculate the loads on your blocks depending on the sails you are using.
http://www.mauriprosailing.com/Harken/h ... rmulas.htm
http://www.mauriprosailing.com/Harken/h ... rmulas.htm
"I desire no more delight, than to be under sail and gone tonight."
(W. Shakespeare, Merchant of Venice)
(W. Shakespeare, Merchant of Venice)
Raw PHRF calculation (approx...) & sheetload spreadsheet
Here's a spreadsheet I built from scrounging PHRF info & Harken's formulas with data set for a "cruising-mode" CD28.
http://sv-kayla.org/KAYLA/misc/Raw_PHRF ... s_CD28.xls
Just adjust the BLACK numbers as needed and the BLUE numbers will calculate for you. If you do not have a excel or OpenOffice (which is FREE!), you can upload this into a Google account (also FREE!).
Hope it helps!
http://sv-kayla.org/KAYLA/misc/Raw_PHRF ... s_CD28.xls
Just adjust the BLACK numbers as needed and the BLUE numbers will calculate for you. If you do not have a excel or OpenOffice (which is FREE!), you can upload this into a Google account (also FREE!).
Hope it helps!
-michael & Toni CDSOA #789
s/v KAYLA CD28 #318
2012 FLSTC Heritage Classic
Niceville FL
+30° 30' 24.60", -86° 26' 32.10"
"Just because it worked, doesn't mean it works." -me
No shirt + No shorts = No problem!
s/v KAYLA CD28 #318
2012 FLSTC Heritage Classic
Niceville FL
+30° 30' 24.60", -86° 26' 32.10"
"Just because it worked, doesn't mean it works." -me
No shirt + No shorts = No problem!