... the ... proas, ... lifts the ... proas ... slightest ... I would say when reaching or running, with the wind more or less abeam. But in that case the boat...
2685
Tom Whicher
twhicher@...
Jun 1, 2001 3:32 pm
Ok, so im no mathmation, and to be honest i havent been completly following this debate but surely atlantic types have the advantage that the heeling moment is...
2686
John Dalziel
johndl@...
Jun 1, 2001 4:34 pm
... The traditional proa when reaching off is trying to heel to _windward_ due to lift from the crab-claw. But since the center of both drive and lift is well...
2687
Brian Southwood
briansou@...
Jun 2, 2001 5:51 am
Rob, We wait with bated breath for the next development. Might a plan be sold? Could another proa be started? These things don't happen every day, and I for...
2688
Rob Denney
carbondesign@...
Jun 2, 2001 9:57 am
Gday, ... How many times? Very few. I have raced harry a couple of times, and been shafted to windward by a very well set up and sailed F31. Matched him ...
2689
Rob Denney
carbondesign@...
Jun 2, 2001 9:59 am
... Ooops, looked like I should have waited before shooting my mouth off as well. I got lost in the maths towards the end. What is the final upshot? Are pac...
2690
hbijlard@...
Jun 3, 2001 1:54 am
... diagram ... Hello Rob, and any others interested in proa-stability. Long before Rob posted this, I started to make a model of my proa's righting moments in...
2691
Malcolm Smith
mal@...
Jun 3, 2001 6:55 am
I have uploaded a spreadsheet to http://groups.yahoo.com/group/proa_file/files/Mal%20Smith/HeelCalc.xls which will calculate: a) the change in angle of attack...
2692
Greg Blanchette
abuzz@...
Jun 3, 2001 7:41 am
At the risk of sounding pedantic, we've had a lot of loose language in this debate. I'd just like to point out that a moment is the result of TWO forces of...
2693
Malcolm Smith
mal@...
Jun 3, 2001 11:57 am
... And the risk of me sounding pedantic, the above is true except when the righting moment is generated by hydrofoils or by sails or wings arranged to do so. ...
2694
hbijlard@...
Jun 3, 2001 12:44 pm
... Now Mal's spreadsheet shows us that this effect is considerable, and as nobody else came up with a name for it, I propose: HIRAA-effect (Heel Induced...
2695
John Dalziel
johndl@...
Jun 3, 2001 4:01 pm
... Mal, thanks for doing this. What we are accomplishing here is demystifying the process of heeling and ultimately providing *everyone* interested with a...
2696
John Dalziel
johndl@...
Jun 3, 2001 4:34 pm
... OK: a subject worth going into: is a traveller that _prevents_ the boom from going to neutral at deep angles of heel, forcing at least a bit of uplift, a...
2697
John Dalziel
johndl@...
Jun 3, 2001 5:01 pm
Excel 97 opens it fine. ... John Dalziel...
2698
K_S_ONeill@...
Jun 3, 2001 7:33 pm
... http://groups.yahoo.com/group/proa_file/files/Mal%20Smith/HeelCalc.xls ... Mal I've been intending to work on this, but had to go sailing instead... Would...
2699
K_S_ONeill@...
Jun 3, 2001 7:46 pm
Went out for the second day sailing, yesterday. A few observations: The Gibbons rig is a breeze to shunt. Easy easy. I'm a little worried about it swinging...
2700
Gary Dierking
garyd@...
Jun 4, 2001 2:08 am
... I'm assuming that you're using a single line with an end tied to each end of the yard. If it's not overly long it insures that there's never much slack at...
2701
mal@...
Jun 4, 2001 2:26 am
... instead... ... have a ... Kevin, Where: Boat heading = Heading Angle of attack = AOA Angle of heel = $B8 The Excel formula for change in AOA for constant...
2702
Rob Denney
carbondesign@...
Jun 5, 2001 4:09 am
G'day, I asked Tom Speer if I could post this to the list. I also asked him to pay us a visit, which he didn't answer. Perhaps he will after he recieves some...
2703
Greg Blanchette
abuzz@...
Jun 5, 2001 4:59 am
... Ix-nay, Mal. No matter how the sails or hydrofoils are arranged, it is always the *vertical* components of the generated forces which provide righting...
2704
Greg Blanchette
abuzz@...
Jun 5, 2001 4:59 am
At 12:35 3/6/01 -0400, you wrote: <snip> ... <snip> Another possibility that I've long considered. Separate the ama from the ballast tank (pacific...
2705
Dave Culp
dave@...
Jun 5, 2001 5:51 am
... "Always?" And when I arrange a kite, hundreds of feet to leeward, in such a way that it's force is applied through the hydrodynamic center of a suitably...
2706
Malcolm Smith
mal@...
Jun 5, 2001 8:04 am
... Further to this: 1) Two opposing canted sails will cancel out the heeling moment and all of the vertical lift components. In this system, no heeling moment...
2707
terho.halme@...
Jun 5, 2001 11:43 am
Hello, I'm Terho Halme, a multimad from Finland, studying yacht manufacturing and surveying at Southampton Institute, UK. I have sailed mostly with monohulls...
2708
Arto Hakkarainen
ahakkara@...
Jun 5, 2001 1:13 pm
Welcome aboard / Tervetuloa mukaan. Nice to know there are at least three proanuts in Finland :-) Arto P.S. Rob Denney on tällä listalla, joten hän varmasti...
2709
Bepi
bepibott@...
Jun 5, 2001 5:38 pm
I've been reading for some time this list. I'm not really involved with proas (at the moment...) but I find the debates interesting and useful also for...
2710
K_S_ONeill@...
Jun 6, 2001 12:31 am
... with ... useful also ... Saw off one ama! Sorry, sorry. ... home a ... English is ... Benvenuto indietro. ... for a ... accuracy ... except ... Of course....
2711
Dan Heil
nocrash@...
Jun 6, 2001 2:42 am
unsubscribe [Non-text portions of this message have been removed]...
2712
Greg Blanchette
abuzz@...
Jun 6, 2001 3:35 am
At 22:53 4/6/01 -0700, you wrote: <snip> ... Whew, this is going on beyond its significance! The *horizontal* component of the kite's lift is applied well...
2713
Rob Denney
carbondesign@...
Jun 6, 2001 8:02 am
G'day and welcome to the list, W has been sailed extensively, and according to it's owner, works well. The flexible structure is a success in terms of reducing...
