BoatBanter.com

BoatBanter.com (https://www.boatbanter.com/)
-   ASA (https://www.boatbanter.com/asa/)
-   -   How keel winglets really work (https://www.boatbanter.com/asa/19133-how-keel-winglets-really-work.html)

DSK February 9th 04 01:15 AM

Herreshoff Pic... & more heel
 
http://www.herreshoff.org/frames/mmphotojboat6big.htm
.... But is it "powered up"?



Nav wrote:
No it isn't. She's not near her hull speed (look at the stern) and the
wind is light. I'll be she'd be closer to hull speed when heeld to 25-30.


And I bet she's going appreciably faster, and a much higher percentage
of her hull speed, than you think.

As for light wind, this is a boat of approx 130' LOA. What looks like
ripples on the water around her is a substantial chop.

Secondly, when I look at the stern and just aft of the stern, I see a
substantial wave train. With a 90 foot waterline, she could be moving at
10+ knots making such waves.

BTW this boat is one of those type specifically designed to increase the
waterline when heeled. But not as extreme a type as this one

http://boatdesign.net/gallery/showph...cat/all/page/1

http://www.boatdesign.net/gallery/sh.../cat/501/page/

BTW this second pic has the grand daddy heavyweight champ of all stern
waves... boat is heeled a good bit... about time to take in that topsail
I'd think ;)

Fresh Breezes- Doug King


Nav February 9th 04 01:56 AM

Herreshoff Pic... & more heel
 


DSK wrote:



http://www.boatdesign.net/gallery/sh.../cat/501/page/


BTW this second pic has the grand daddy heavyweight champ of all stern
waves... boat is heeled a good bit... about time to take in that topsail
I'd think ;)


What would you estimate the angle of heel to be?

Cheers


Nav February 9th 04 01:58 AM

Herreshoff Pic... & more heel
 
Now this _is_ too much

http://www.boatdesign.net/gallery/sh.../cat/501/page/

Cheers

DSK wrote:

http://www.herreshoff.org/frames/mmphotojboat6big.htm
.... But is it "powered up"?




Nav wrote:
No it isn't. She's not near her hull speed (look at the stern) and the
wind is light. I'll be she'd be closer to hull speed when heeld to 25-30.



And I bet she's going appreciably faster, and a much higher percentage
of her hull speed, than you think.

As for light wind, this is a boat of approx 130' LOA. What looks like
ripples on the water around her is a substantial chop.

Secondly, when I look at the stern and just aft of the stern, I see a
substantial wave train. With a 90 foot waterline, she could be moving at
10+ knots making such waves.

BTW this boat is one of those type specifically designed to increase the
waterline when heeled. But not as extreme a type as this one

Now this _is_ too much

http://www.boatdesign.net/gallery/sh.../cat/501/page/

Cheers


DSK February 9th 04 02:23 AM

Herreshoff Pic... & more heel
 
Nav wrote:
Now this _is_ too much

http://www.boatdesign.net/gallery/sh.../cat/501/page/


How about this

http://www.boatdesign.net/gallery/sh...php/photo/334/

What do you estimate the heel angle of these two to be? Hint- is is
pretty close to the range you were claiming is "powered up" earlier.

BTW you never did clarify what you meant by 'powered up' with regard to
VMG or speed relative to true wind velocity or what.

DSK


Nav February 9th 04 02:55 AM

Herreshoff Pic... & more heel
 


DSK wrote:

Nav wrote:

Now this _is_ too much

http://www.boatdesign.net/gallery/sh.../cat/501/page/




How about this

http://www.boatdesign.net/gallery/sh...php/photo/334/

What do you estimate the heel angle of these two to be? Hint- is is
pretty close to the range you were claiming is "powered up" earlier.


You really think that boat (?668) is beating to windward? Is 45 close to
30 when discussing trim and heeling?


Cheers


Scott Vernon February 10th 04 01:55 AM

IACC Boat speed at 30 degrees heel?
 
he he, I still chuckle at the picture of them bailing out the boat with
their cedar bucket.
;)

Scotty


"Thom Stewart" wrote in message
...
Nav,

Really!! You're not being fair calling those "Solo around the world"
boats mono's. Their beams are so wide and their draft so shallow that
they are Cats built in one piece and designed to sail with more than
half the hull flying.

They were just about as bad as the Kiwi POS used for the cup defense.

Their failure rate in that last so called race wound up being for
survival and not for speed!

Ole Thom



Nav February 10th 04 02:05 AM

IACC Boat speed at 30 degrees heel?
 
It was very sad indeed. To have banked their defense so heavily on
lighter winds was not a good call.

Cheers

Scott Vernon wrote:

he he, I still chuckle at the picture of them bailing out the boat with
their cedar bucket.
;)

Scotty


"Thom Stewart" wrote in message
...

Nav,

Really!! You're not being fair calling those "Solo around the world"
boats mono's. Their beams are so wide and their draft so shallow that
they are Cats built in one piece and designed to sail with more than
half the hull flying.

They were just about as bad as the Kiwi POS used for the cup defense.

Their failure rate in that last so called race wound up being for
survival and not for speed!

Ole Thom





Scott Vernon February 10th 04 02:28 AM

IACC Boat speed at 30 degrees heel?
 
sad? I thought it was funny.

SV

"Nav" wrote in message
...
It was very sad indeed. To have banked their defense so heavily on
lighter winds was not a good call.

Cheers

Scott Vernon wrote:

he he, I still chuckle at the picture of them bailing out the boat with
their cedar bucket.
;)

Scotty


"Thom Stewart" wrote in message
...

Nav,

Really!! You're not being fair calling those "Solo around the world"
boats mono's. Their beams are so wide and their draft so shallow that
they are Cats built in one piece and designed to sail with more than
half the hull flying.

They were just about as bad as the Kiwi POS used for the cup defense.

Their failure rate in that last so called race wound up being for
survival and not for speed!

Ole Thom






Nav February 10th 04 02:33 AM

IACC Boat speed at 30 degrees heel?
 
I see. I expected more from you.

Cheers

Scott Vernon wrote:

sad? I thought it was funny.

SV

"Nav" wrote in message
...

It was very sad indeed. To have banked their defense so heavily on
lighter winds was not a good call.

Cheers

Scott Vernon wrote:


he he, I still chuckle at the picture of them bailing out the boat with
their cedar bucket.
;)

Scotty


"Thom Stewart" wrote in message
...


Nav,

Really!! You're not being fair calling those "Solo around the world"
boats mono's. Their beams are so wide and their draft so shallow that
they are Cats built in one piece and designed to sail with more than
half the hull flying.

They were just about as bad as the Kiwi POS used for the cup defense.

Their failure rate in that last so called race wound up being for
survival and not for speed!

Ole Thom






Scott Vernon February 10th 04 02:45 AM

IACC Boat speed at 30 degrees heel?
 
You didn't see the humour in a multi million dollar boat, with a multi
million dollar crew backed by a multi million dollar syndicate being bailed
with a plastic bucket?

SV


"Nav" wrote in message
...
I see. I expected more from you.

Cheers

Scott Vernon wrote:

sad? I thought it was funny.

SV

"Nav" wrote in message
...

It was very sad indeed. To have banked their defense so heavily on
lighter winds was not a good call.

Cheers

Scott Vernon wrote:


he he, I still chuckle at the picture of them bailing out the boat with
their cedar bucket.
;)

Scotty


"Thom Stewart" wrote in message
...


Nav,

Really!! You're not being fair calling those "Solo around the world"
boats mono's. Their beams are so wide and their draft so shallow that
they are Cats built in one piece and designed to sail with more than
half the hull flying.

They were just about as bad as the Kiwi POS used for the cup defense.

Their failure rate in that last so called race wound up being for
survival and not for speed!

Ole Thom








All times are GMT +1. The time now is 09:12 PM.

Powered by vBulletin® Copyright ©2000 - 2025, Jelsoft Enterprises Ltd.
Copyright ©2004 - 2014 BoatBanter.com