Max hull speed on 1985 C&C
Posted by Quantum_Fuzzics@reddit | sailing | View on Reddit | 15 comments
Apologies if this is a basic beesh question. New-ish to sailing and racing. Does anyone know where I could find the max hull speeds for the different points of sail for a 1985 C&C 33 MK1? Thanks to anyone who can point me in the right direction!
pdq_sailor@reddit
1985 ... means its a MKII not a Mk I which was 1975... Upwind ... max is 6.5 knots, flat water perhaps a tick higher.. Reaching ... 7.5 at 60 degrees AWA... Downwind max can be much higher if you are surfing with a chute up... surging to 10 knots steady at 7.5 ... This boat is an interesting collection of Rob Ball's innovations... Rudder, deep sump, variable wall thickness mast...
Quantum_Fuzzics@reddit (OP)
Damn you are good. And 100% correct. Was typing late last night and accidentally wrote 1985 instead of 1975. It’s a 1975 MK 1. Thanks for catching my mistake
pdq_sailor@reddit
I am not so sure if I am good or old or perhaps both... The 1975 Mk I was Rob Balls FIRST solo design... it was intended as an IOR 3/4 ton racer... Atomic Four engine with a V drive was the typical power plant.. I have a friend who owns one.. I can ask if he has the polar diagrams for it....
overthehillhat@reddit
6.5 knots is about what most 30somethings do
the best way to know how designs compare speeds is PHRF ratings
Just_Medium6815@reddit
This guy sail boats
pdq_sailor@reddit
Yes... I sail and have done so for over fifty years. I crewed on a very successful C&C custom over 50' as a young man and got to sail with and against some of the finest sailors ever. Our classic C&C design has been well maintained and upgraded extensively including in performance and its very fast..
Dolphin008@reddit
A quick search reveals there’s at least one ORC certificate for a mk2, so while the polar probably won’t be 100% it at least will give you an idea
https://data.orc.org/public/WPub.dll/CC/246018
Quantum_Fuzzics@reddit (OP)
Thank you much! :)
Cultural-Brain-8594@reddit
That’s interesting, because some boats have a greater wetted waterline when heeled so on a dead run they’d have less speed. I’m just commenting to learn more from the answers don’t mind me
the__itis@reddit
This is correct and part of the history of the America’s Cup.
mk3waterboy@reddit
What you want is a polar digram. A quick search doesn’t surface any publicly available copies. You might try contacting US sailing, or your local authority.
FYI, hull speed usually refers to a theoretical max speed of a hull defined by the wave form produced by the hull. Boats can exceed this by surfing, planing etc. less so for heavier boats with hull shapes like the C&C 35.
hackshowcustoms@reddit
An ORC cert will generate polars. OP would have to pay and enter all their sail data of course but I'd guess that someone has already measured the hull and all that.
Cultural-Brain-8594@reddit
https://letmegooglethat.com/?q=1985+c%26c+33+mk1+sailboat+hull+speed&l=1
PacificIsMyHome@reddit
Square root of the length of the wetted waterline (in feet) x 1.34 = speed in knots.
Golywobblerer@reddit
Sailboatdata.com
But probably 6-7 kts