Subject: [harryproa] Re:: HP balance
From: "ryanonthebeach@gmail.com [harryproa]"
Date: 3/26/2019, 9:30 AM
To: <harryproa@yahoogroups.com.au>
Reply-to:
harryproa@yahoogroups.com.au

 

Rick - I think we are saying the same thing, and it seems you experienced first hand the performance boost of getting it all nicely balanced.

Doug - Yes, by balance I mean Weather and lee helm which is caused by the interaction of CE and CLR, see:
https://johnellsworth.com/writing/nautical/balance_helm/balance.html
Balance can shift a bit upwind and downwind as the sails (CE) moves around and with some of the racing boats they move the CLR with the boards (angled back, as you raise the board the CE moves forward) or with tri's multiple boards, center board and boards set more forward on the amas (sometimes C foils to help lift the nose downwind). They would drop the ama board downwind and raise the center board. 

General 
You can see this balance shifting as a disadvantage or an advantage with an HP, I'm sure the cat and tri racers will love to be able to shift the CLR around as much as is possible on an HP. For cruisers it's a bit of a pain... same reason asymmetric boards are not used on cruisers, cruising boats are generally designed to already be balanced on either tack (slight weather helm), so you can thrown her over and get back to your beer without running around to much. To mitigate, there should be a system of lines leading to the cockpit on an HP to lift the front board and drop the aft one on a shunt to kick the CLR back. I've sketched one out, but was wondering if anyone has already solved for this. 


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Posted by: ryanonthebeach@gmail.com
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