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rider weight and planing ?
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cgoudie1



Joined: 10 Apr 2006
Posts: 1199
Location: Killer Sturgeon Cove

PostPosted: Tue Aug 14, 2012 4:14 pm    Post subject: Reply with quote

Actually, the OPs original question was same board same rig, how much
earlier to plane, he then followed by saying he'd lose weight in a later
post, wherein I just recommended a bigger sail. Somewhere the
thread veered into how to get the same planing
power. I thought my response best reflected the original question.
from a physics standpoint, it's surface area and shape (and weight),
not volume. Certainly most 135s are built to plane earlier than 120s,
and the reason they do is because they are wider (or have some
other derivation of a larger more efficient surface area), not because
they have more displacement.

-Craig



isobras wrote:
cgoudie1 wrote:
If your hypothetical 120 and
135 Ltr boards had identical bottom dimensions, and were only different
in top to bottom thickness, then there would be little difference in how
quickly they plane up under the same rider and rig weight

I don't see where anyone claimed that, and that's a mighty big "If". In a given brand and model of board, the 135 will be wider (and probably be shaped with earlier planing in mind) than the 120. And between different brands or models, the shapes are not likely to be identical.
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w8n4wind



Joined: 12 Nov 2008
Posts: 268
Location: canada

PostPosted: Tue Aug 14, 2012 5:06 pm    Post subject: Reply with quote

cgoudie1 wrote:
Actually, the OPs original question was same board same rig, how much
earlier to plane, he then followed by saying he'd lose weight in a later
post, wherein I just recommended a bigger sail. Somewhere the
thread veered into how to get the same planing
power. I thought my response best reflected the original question.
from a physics standpoint, it's surface area and shape (and weight),
not volume. Certainly most 135s are built to plane earlier than 120s,
and the reason they do is because they are wider (or have some
other derivation of a larger more efficient surface area), not because
they have more displacement.

-Craig



isobras wrote:
cgoudie1 wrote:
If your hypothetical 120 and
135 Ltr boards had identical bottom dimensions, and were only different
in top to bottom thickness, then there would be little difference in how
quickly they plane up under the same rider and rig weight

I don't see where anyone claimed that, and that's a mighty big "If". In a given brand and model of board, the 135 will be wider (and probably be shaped with earlier planing in mind) than the 120. And between different brands or models, the shapes are not likely to be identical.


ya, lets stay on topic..its all about me.. Wink

yes, i could rig a bigger sail, but right now im using a northwave 7.2/kona 11'5'' as my lightwind 'wave' setup, and dont really want to rig bigger..
and, also the cost involved rigging bigger..a new sail, and a mast..
but by losing weight id actually be saving some cash.. so then that cash could be used to buy the bigger sail..that i wouldnt need anymore because i was already planing earlier because i lost weight.. uh, never mind.

really i just want to get the planing threshold down to about the same as buddy on his 15m kite..
Mad

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boardsurfr



Joined: 23 Aug 2001
Posts: 519

PostPosted: Tue Aug 14, 2012 5:21 pm    Post subject: Reply with quote

w8n4wind wrote:
and if it is... im going on a diet.
as that extra 2 miles an hour can make a big difference where i sail.

Loosing weight will let you plane earlier, no doubt about it. When I need a 7.0 to plane, my wife can typically plane on a 5.0. Our skills are similar, but I am about 40% heavier than she is. One time when I dropped from 195 lb to 185, I definitely noticed the difference, and the size difference in our sails was less.

Improving your skills will also get you planing on smaller gear, but loosing weight may be easier and faster. My planing threshold on 6.5-8.5 m sails has dropped about 1 mph per year for the past 3 years, but that's with about 100 sessions and several ABK camps each year. However, I am not the fastest learner, and I have decades of bad habits to unlearn. For better learners and younger windsurfers, the progress is faster.
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cgoudie1



Joined: 10 Apr 2006
Posts: 1199
Location: Killer Sturgeon Cove

PostPosted: Tue Aug 14, 2012 5:55 pm    Post subject: Reply with quote

Dang straight it is. ;*)

So since you don't wanna rig bigger, and you wanna outplane your buddies
Kite, I recommend a loss of 20 lbs, a bigger fin, and maybe even a
more efficient hull. Konas are a sweet for wave riding, but not the most efficient planers. Maybe you want something shorter and about 72cm
wide (like my Angulo Sumo 155). A board like that won't be great for waves, but it's rideable, and it'll plane up earlier if that's your goal.

-Craig

w8n4wind wrote:
[ya, lets stay on topic..its all about me.. Wink

yes, i could rig a bigger sail, but right now im using a northwave 7.2/kona 11'5'' as my lightwind 'wave' setup, and dont really want to rig bigger..
and, also the cost involved rigging bigger..a new sail, and a mast..
but by losing weight id actually be saving some cash.. so then that cash could be used to buy the bigger sail..that i wouldnt need anymore because i was already planing earlier because i lost weight.. uh, never mind.

really i just want to get the planing threshold down to about the same as buddy on his 15m kite..
Mad
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spennie



Joined: 13 Oct 1995
Posts: 787
Location: Thousand Oaks, CA

PostPosted: Sun Aug 19, 2012 10:59 am    Post subject: Reply with quote

So loosing weight will get you planning faster? What?
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dennis_c



Joined: 05 May 1998
Posts: 639
Location: Rio

PostPosted: Sun Aug 19, 2012 2:37 pm    Post subject: Reply with quote

http://www.thinkgeek.com/product/894a/
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