Location of the mast on deck.

Greetings all,
 
 
I have (finally) reached the point of mounting the chain plates.
 
To accomplish this I must first locate the center of the mast mark on deck
 
Can anyone tell me the diameter of the mast hole on deck and how this hole
is located on the centerline.
 
I have one page from the manual  which SEEMS to indicate that the leading edge of
the mast hole is located 10' 11 1/2" from the stem. Is this correct?
 
This is a somewhat critical measurement and I'd like to get it right. Sumiyo? Roger?
 Anyone?
 
Thank you for your attention.
 
Cheers
 
Donald Kircher
 
 
 
Sumio:
 
Excellent technical support.  We can all rest assured that Sam L. Morse Co. is in very capable hands - thank you.
 
Fair Winds,
 
Rod
S/V IDUNA
----- Original Message -----
From: Sumio Oya
Sent: Thursday, January 23, 2003 9:03 PM
Subject: Re: [bcc] Location of the mast on deck.

Hi Don,
 
There is center dot on the deck where mast center should be.
Which is 6-1/2" from the cabin face.
So, make another 6-1/2 marks in front of the each side of the cabin,
Then draw the straight line which cover all three dots.
Each ends of the line at the edge of the deck are the location of the center chain plats.
 
The size of the hole is depend on the mast and mast collar.
If you have a fax number and if you are using same Forspar mast,
then I can send you the actual drawing of the mast and mast collar with
4 point center lines.
 
Best Regards,
Sumio Oya
Sam L. Morse Co.
 
Hi Don,
 
There is center dot on the deck where mast center should be.
Which is 6-1/2" from the cabin face.
So, make another 6-1/2 marks in front of the each side of the cabin,
Then draw the straight line which cover all three dots.
Each ends of the line at the edge of the deck are the location of the center chain plats.
 
The size of the hole is depend on the mast and mast collar.
If you have a fax number and if you are using same Forspar mast,
then I can send you the actual drawing of the mast and mast collar with
4 point center lines.
 
Best Regards,
Sumio Oya
Sam L. Morse Co.
----- Original Message -----
From: Don
Sent: Thursday, January 23, 2003 10:12 AM
Subject: [bcc] Location of the mast on deck.

Greetings all,
 
 
I have (finally) reached the point of mounting the chain plates.
 
To accomplish this I must first locate the center of the mast mark on deck
 
Can anyone tell me the diameter of the mast hole on deck and how this hole
is located on the centerline.
 
I have one page from the manual  which SEEMS to indicate that the leading edge of
the mast hole is located 10' 11 1/2" from the stem. Is this correct?
 
This is a somewhat critical measurement and I'd like to get it right. Sumiyo? Roger?
 Anyone?
 
Thank you for your attention.
 
Cheers
 
Donald Kircher
 
 
 



Thank you for the information Roger.
 
On my boat the dimple is there but has been filled in with 5200 or something. I couldn't see it till I got  right down close on my hands and knees
A bit of magic marker made it obvious.
 
 
 
----- Original Message -----
Sent: Thursday, January 30, 2003 2:57 PM
Subject: Re: [bcc] Location of the mast on deck.

Don, I really cannot help because I do not have the exact mearurements with me in Fresno.  However, I am sure Sumio will respond.  I do remember that there is a bump in the mould which indicates the center of the hole. This should show up as a dimple on the deck.  Before you start cutting, be sure to check with Sumio.  Also, since I know you will be installing the mast step soon, remember to set it perpendicular or plumb, not forward as your drawing may indicate.  This will reduce the rake in the mast, thus reduce weather helm.
 
Roger
 
Don, I really cannot help because I do not have the exact mearurements with me in Fresno.  However, I am sure Sumio will respond.  I do remember that there is a bump in the mould which indicates the center of the hole. This should show up as a dimple on the deck.  Before you start cutting, be sure to check with Sumio.  Also, since I know you will be installing the mast step soon, remember to set it perpendicular or plumb, not forward as your drawing may indicate.  This will reduce the rake in the mast, thus reduce weather helm.
 
Roger
----- Original Message -----
From: Don
Sent: Thursday, January 23, 2003 10:12 AM
Subject: [bcc] Location of the mast on deck.

Greetings all,
 
 
I have (finally) reached the point of mounting the chain plates.
 
To accomplish this I must first locate the center of the mast mark on deck
 
Can anyone tell me the diameter of the mast hole on deck and how this hole
is located on the centerline.
 
I have one page from the manual  which SEEMS to indicate that the leading edge of
the mast hole is located 10' 11 1/2" from the stem. Is this correct?
 
This is a somewhat critical measurement and I'd like to get it right. Sumiyo? Roger?
 Anyone?
 
Thank you for your attention.
 
Cheers
 
Donald Kircher
 
 
 



Tom, I doubt it will cause a problem.  I don't advise doing anything until the boat is sailing then make necessary adjustments.  The primary concern is to set the mast as perpendicular as possible.
 
Roger
----- Original Message -----
Sent: Thursday, January 23, 2003 4:37 PM
Subject: Re: [bcc] Location of the mast on deck.

Roger.......I have a 4 section Sitka spruce mast with quite a bit of builtin rake starting @ the top spreaders......5 or 6 inchs.  The mast was
glued up that way.  Will this increase weather helm ?
 
Don....do you recommend this manual for construction?
 
Thanks,
 
Tom Chapman
St. Helens
S/V COLD MOUNTAIN
----- Original Message -----
Sent: Thursday, January 30, 2003 11:57 AM
Subject: Re: [bcc] Location of the mast on deck.

Don, I really cannot help because I do not have the exact mearurements with me in Fresno.  However, I am sure Sumio will respond.  I do remember that there is a bump in the mould which indicates the center of the hole. This should show up as a dimple on the deck.  Before you start cutting, be sure to check with Sumio.  Also, since I know you will be installing the mast step soon, remember to set it perpendicular or plumb, not forward as your drawing may indicate.  This will reduce the rake in the mast, thus reduce weather helm.
 
Roger
----- Original Message -----
From: Don
Sent: Thursday, January 23, 2003 10:12 AM
Subject: [bcc] Location of the mast on deck.

Greetings all,
 
 
I have (finally) reached the point of mounting the chain plates.
 
To accomplish this I must first locate the center of the mast mark on deck
 
Can anyone tell me the diameter of the mast hole on deck and how this hole
is located on the centerline.
 
I have one page from the manual  which SEEMS to indicate that the leading edge of
the mast hole is located 10' 11 1/2" from the stem. Is this correct?
 
This is a somewhat critical measurement and I'd like to get it right. Sumiyo? Roger?
 Anyone?
 
Thank you for your attention.
 
Cheers
 
Donald Kircher