New Posts New Posts RSS Feed: What does this measurement rule mean?
  FAQ FAQ  Forum Search   Register Register  Login Login

What does this measurement rule mean?
 Post Reply Post Reply Page  123 4>
Author
  Share Topic Share Topic  Topic Search Topic Search  Topic Options Topic Options
Daniel Holman View Drop Down
Really should get out more
Really should get out more


Joined: 17 Nov 08
Online Status: Offline
Posts: 997 		Post Options Post Options   Quote Daniel Holman Quote  Post ReplyReply Direct Link To This Post Topic: What does this measurement rule mean?
    Posted: 06 Jan 19 at 11:15pm
😀
Back to Top
craiggo View Drop Down
Really should get out more
Really should get out more
Avatar

Joined: 01 Apr 04
Location: United Kingdom
Online Status: Offline
Posts: 1810 		Post Options Post Options   Quote craiggo Quote  Post ReplyReply Direct Link To This Post Posted: 06 Jan 19 at 10:32pm
Sorry Dan, I did note the sarcasm.

Was just making the point for the benefit of others who might not!
OK 2129
RS200 411
Back to Top
zeon View Drop Down
Far too distracted from work
Far too distracted from work


Joined: 20 Aug 16
Online Status: Offline
Posts: 316 		Post Options Post Options   Quote zeon Quote  Post ReplyReply Direct Link To This Post Posted: 06 Jan 19 at 9:48pm
Originally posted by davidyacht

I went for a CP of .55 with Annie Apple, which was slippery in light winds and ran out chines to the transom for planing performance.  Worked pretty well, until my daughter became more adult sized.  I drew a foiling rudder for her but never had the courage to see it through.  With hindsight I would have gone for a deeper, filled out stem, with less compromise for planing sections, putting more emphasis on the foils for lift.

.60 sounds high, but in the 14 sailing in light winds is of less relevance.

Ref. Midship section, you need to consider the small tweak of resting the rise of floor jig on the topside chine, and have maximum overhang for the gunwales, also you don’t necessarily need to go for minimum freeboard, the geometry of the double floor and the length of your lower leg might push you to a higher freeboard, also this has the effect of reducing the beam of the topsides lower down.

Oh wow . Are you the original owner/ designer of Annie Apple ? This boat has been at our club for about the last decade . It’s still going great , in light winds too, with a female crew that is definitely adult sized lol 
Back to Top
Rupert View Drop Down
Really should get out more
Really should get out more


Joined: 11 Aug 04
Location: Whitefriars sc
Online Status: Offline
Posts: 8956 		Post Options Post Options   Quote Rupert Quote  Post ReplyReply Direct Link To This Post Posted: 06 Jan 19 at 9:18pm
Actually, I'm the quest for speed, ease of sailing does appear to be forgotten in many cases, as does a decent light wind performance. Probably one reason dinosaur designs are still popular.
Firefly 2324, Puffin 229, Minisail 3446 Mirror 70686
Back to Top
Rupert View Drop Down
Really should get out more
Really should get out more


Joined: 11 Aug 04
Location: Whitefriars sc
Online Status: Offline
Posts: 8956 		Post Options Post Options   Quote Rupert Quote  Post ReplyReply Direct Link To This Post Posted: 06 Jan 19 at 9:16pm
Because sarcasm always works on the the internet...
Firefly 2324, Puffin 229, Minisail 3446 Mirror 70686
Back to Top
Daniel Holman View Drop Down
Really should get out more
Really should get out more


Joined: 17 Nov 08
Online Status: Offline
Posts: 997 		Post Options Post Options   Quote Daniel Holman Quote  Post ReplyReply Direct Link To This Post Posted: 06 Jan 19 at 8:57pm
I realise that all too well with these days pre mk1 Neanderthal processing. I was being facetious / flippant / sarcastic.
Back to Top
craiggo View Drop Down
Really should get out more
Really should get out more
Avatar

Joined: 01 Apr 04
Location: United Kingdom
Online Status: Offline
Posts: 1810 		Post Options Post Options   Quote craiggo Quote  Post ReplyReply Direct Link To This Post Posted: 06 Jan 19 at 8:47pm
Numerical optimisation is all well and good but you need to be able to keep it in the design groove with MK1 human processing otherwise it won't be very successful.
OK 2129
RS200 411
Back to Top
Daniel Holman View Drop Down
Really should get out more
Really should get out more


Joined: 17 Nov 08
Online Status: Offline
Posts: 997 		Post Options Post Options   Quote Daniel Holman Quote  Post ReplyReply Direct Link To This Post Posted: 06 Jan 19 at 8:06pm
Originally posted by craiggo

It's also worthwhile checking the underwater shapes when heeled to +10°. You don't want to create something which comes to a grinding halt whenever the crew fails to pinch of ease sheet.

Nonsense you always design a boat for sailing beyond reproach 😀
Back to Top
craiggo View Drop Down
Really should get out more
Really should get out more
Avatar

Joined: 01 Apr 04
Location: United Kingdom
Online Status: Offline
Posts: 1810 		Post Options Post Options   Quote craiggo Quote  Post ReplyReply Direct Link To This Post Posted: 06 Jan 19 at 7:57pm
It's also worthwhile checking the underwater shapes when heeled to +10°. You don't want to create something which comes to a grinding halt whenever the crew fails to pinch or ease sheet.

Edited by craiggo - 06 Jan 19 at 8:42pm
OK 2129
RS200 411
Back to Top
davidyacht View Drop Down
Really should get out more
Really should get out more


Joined: 29 Mar 05
Online Status: Offline
Posts: 1345 		Post Options Post Options   Quote davidyacht Quote  Post ReplyReply Direct Link To This Post Posted: 06 Jan 19 at 3:22pm
I went for a CP of .55 with Annie Apple, which was slippery in light winds and ran out chines to the transom for planing performance.  Worked pretty well, until my daughter became more adult sized.  I drew a foiling rudder for her but never had the courage to see it through.  With hindsight I would have gone for a deeper, filled out stem, with less compromise for planing sections, putting more emphasis on the foils for lift.

.60 sounds high, but in the 14 sailing in light winds is of less relevance.

Ref. Midship section, you need to consider the small tweak of resting the rise of floor jig on the topside chine, and have maximum overhang for the gunwales, also you don’t necessarily need to go for minimum freeboard, the geometry of the double floor and the length of your lower leg might push you to a higher freeboard, also this has the effect of reducing the beam of the topsides lower down.
Happily living in the past
Back to Top
 Post Reply Post Reply Page  123 4>

Forum Jump Forum Permissions View Drop Down

Bulletin Board Software by Web Wiz Forums® version 9.665y
Copyright ©2001-2010 Web Wiz
Change your personal settings, or read our privacy policy