CB vs MH (silly question)

[kpgraci]

Searching around I find references to both to an 'ODay 22 CB' and an 'ODay 22 MH'.

Now I think CD stands for Center board, and MH for...Mast Head sloop?

I know after 78 or so the fixed keel ODay 22 became a swing keel and around the same time changed from a masthead to a fractional jib, so is that what the model references are about?

I saw somewhere that NE PHRF numbers for the CB were 279 and the MH at 285, indicating that the CB, while slow, was faster than the MH.

Am I interpreting that correctly?

 

[Sunbird22358]

The 22 was a shoal-keel from 1972-78 with a draft of 1'11" and had a masthead rig (22' mast length). The keel was changed to a Keel/Centerboard (K/CB) in 1979 with a draft of 1'3" bd-up 4'3" bd-down. In 1980 the rig was changed to a fractional rig (27' mast length). The ballast was 600# originally, incresed to 700# in 1979 and to 800# in 1980.
There never was a swing-keel version and in fact O'Day went to great lengths to tell the advantages of their K/CB designs versus their competitor's swing-keel designs.