[C38] PHRF rating versus actual displacement?

[Steve Smolinske]

The original IOR Certificate for our boats lists them with displacement
of 13,356 

-----Original Message-----
From: listserve-bounces at catalina38.org
[mailto:listserve-bounces at catalina38.org] On Behalf Of
ssorton at sbcglobal.net
Sent: Tuesday, January 12, 2010 9:47 AM
To: glenn at easternyachtri.com; Catalina 38 Listserve
Subject: Re: [C38] PHRF rating versus actual displacement?

Glen,  Part of the displacement increase maybe due to gel coat that was
used on almost all fiberglass boats of that time period.  My hull was
built the last part of '84 with a polyester gel coat system that
included a fire retardant.  This system proved to greatly enhance the
growth of blisters.  I like to race and at haul out every 2-3 years I
couldn't sand the old paint without breaking through the blisters.
Every broken blister had to be recoated with epoxy- I had hundreds and
hundreds of them.  After going through a couple of haul outs repairing
blisters, I had the bottom pealed (removing all gel coat below the water
line- about 1/8th of a inch), and replaced with a vinylester gel coat
system.  Vinyslester system is used on all modern fiberglass hulls.  The
result was no more blisters and the boat floats a good inch higher- not
measured though, just visual.  I also believe the boat is dryer on the
inside.  The bottom line on all this is I believe our hulls can soak up
a lot of water/weight, which could explain some of the weight
deferential between PHRF and actual.
Cheers, Steve Orton (hull #304)

-----Original Message-----
From: listserve-bounces at catalina38.org
[mailto:listserve-bounces at catalina38.org]On Behalf Of Glenn 401 855 4355
Sent: Friday, January 08, 2010 11:34 AM
To: listserve at catalina38.org
Subject: [C38] PHRF rating versus actual displacement?




Has any one compared their actual displacement figures with the factory
specs?

I own hull number 13, POIA, here in New England.  Have owned her for
almost 12 years.

I have the feeling she is "overweight" and like many boat mfgs I work
with this is not unusual to have a displacement spec that was a target
but not achieved.  This particularly happens with the first few boats
built; they are over built which is a good thing.

However, I am going to have POIA measured this spring since if the
displacement is in fact much higher than the specs then her PHRF rating
is lower than it should be.  I would be curious if other members have
any such experiences?

thanks
Glenn Walters



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