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I think you are right as:

my sheerline is 550mm from mast step plus 6100, would give a mast length of 6650mm. my current mast is only 6400mm.  the longer mast would mean a foot to boom of 1125 rather than the 800 I have now.  1125 as a max would give a respectable area under the boom, and a lot less head banging!

many thanks
Mark

This does seem quite tricky;
I have read from the class measurement manual and:

1. from sheerline to bottom black band 380mm
2. from bottom band to top max 6100mm

with my boat the sheerline is 550mm from mast step plus 380mm from above gives 930mm to boom ( I am assuming the boom gooseneck sits on the bottom black line?)

930mm from bottom of boat to boom seems quite low compared to other boats in my dinghy park.

Its a Proctor Mk IX ( 1960 clinker)

I belive the mast is a super spars.

I have a somewhat technical question;  I acquired a 2nd-hand mast which was okay with my old sails, however, I have now acquired new sails necessitating the lowering of the boom.  This was okay but has become a bit of a headache ( literally).
 The luff of my new mainsail is some 5525mm and my mast-foot to the sheerline is some 550mm. My questions are:
1. what length should the mast be?
2, what distance should the boom be from the mast foot?  ( hull mounted not deck) currently this distance is only 800mm from mast foot to boom.  

 that will be 1851 then....

Does anybody know what the PY No is for a Proctor iX?

Blimey! I wasn't but my boat was.   Middle pic '1851' moored up by the 'suites' hopefully, that wasn't their sailing attire!

I have owned 1851 for nearly 20yrs, my friend in the Lake District had her for a few years prior to this.   I would be very interested in the missing 25 or so yrs, do you know any of her history or have any other photo's?

best rgds
Mark

I have recently got my 1960 Mark IX ( 1851) back in the water after some 18 years.  I am still using the orginal sails, however,  after some 46 years of use I think the boat is ready for a newer set.  Does anybody have a set they no longer require?