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Re: New Hobie F18? [Re: ThunderMuffin] #159876
11/07/08 12:49 PM
11/07/08 12:49 PM
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california
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looks like a inverted anti-pitchpole foil
Is it just the angle of the pic or is the hull asymetric?

Last edited by hobie18rich; 11/07/08 12:53 PM.

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-- Have You Seen This? --
Re: New Hobie F18? [Re: F-18 5150] #159880
11/07/08 02:12 PM
11/07/08 02:12 PM
Joined: Jun 2001
Posts: 733
Home is where the harness is.....
Will_R Offline
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Home is where the harness is.....
I have a guess... but it's a SWAG

That "lip" causes air to be sucked into the water flowing next to the hull, similar to a stepped hull on a power boat. Decreases resistance.

Now, if not that... maybe it's just to deflect spray a little.

Re: New Hobie F18? [Re: Will_R] #159889
11/07/08 03:49 PM
11/07/08 03:49 PM
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South Carolina
Jake Offline
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It's too high up for that though...and it's indented the wrong way to be an anti-pitchpole feature. I can't figure out what the idea is behind that.


Jake Kohl
Re: New Hobie F18? [Re: Jake] #159890
11/07/08 03:59 PM
11/07/08 03:59 PM
Joined: Jun 2001
Posts: 733
Home is where the harness is.....
Will_R Offline
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Home is where the harness is.....
Yeah, i was thinking the same thing too b/c a step would be 90 degrees to what it is on this hull... but got to thinking a/b the way water flows over these hulls. It's not just a fore/aft flow but there is a lot of flow vertically in that area of the hull. Unless Hobie tells us, this is all guess work anyway.

Re: New Hobie F18? [Re: Will_R] #159891
11/07/08 04:18 PM
11/07/08 04:18 PM
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california
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the lip looks to be bigger on top than bottom. thats what made me think of the pitchpole foils.
like it will create a lifting force on the bow if driven down. maybe we will see at the paris boat show when its unveiled.


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Re: New Hobie F18? [Re: F-18 5150] #159894
11/07/08 05:02 PM
11/07/08 05:02 PM
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Posts: 1,884
Detroit, MI
mbounds Offline
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It's like the deck lip on a Hobie 16 - a spray deflector.
[Linked Image]

I really can't see where that's going to be any faster.

Re: New Hobie F18? [Re: F-18 5150] #159895
11/07/08 05:03 PM
11/07/08 05:03 PM
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Posts: 266
UK
Cheshirecatman Offline
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Just a spray rail. Look where it fairs back into the hull. The Mk1 hawk had a problem with the spray from this area flowing over the rounded deck and hitting the main beam making the leeward hull a very wet area for the crew.

Cheshirecatman

Re: New Hobie F18? [Re: Cheshirecatman] #159896
11/07/08 05:13 PM
11/07/08 05:13 PM
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Posts: 12,310
South Carolina
Jake Offline
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Originally Posted by Cheshirecatman
Just a spray rail. Look where it fairs back into the hull. The Mk1 hawk had a problem with the spray from this area flowing over the rounded deck and hitting the main beam making the leeward hull a very wet area for the crew.

Cheshirecatman


OK, I can see that. I can really feel that water washing over the deck and hitting the front beam on the I20 and it drives me nuts. Nacra solved that on the Infusion by making the top forward deck relatively flush with the main beam. They wouldn't stop a pitchpole but maybe you can get a little lift out of it with those chines (or whatever you would call them).


Jake Kohl
Re: New Hobie F18? [Re: Jake] #159898
11/07/08 05:55 PM
11/07/08 05:55 PM
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UK
Cheshirecatman Offline
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Originally Posted by Jake
Originally Posted by Cheshirecatman
Just a spray rail. Look where it fairs back into the hull. The Mk1 hawk had a problem with the spray from this area flowing over the rounded deck and hitting the main beam making the leeward hull a very wet area for the crew.

Cheshirecatman


OK, I can see that. I can really feel that water washing over the deck and hitting the front beam on the I20 and it drives me nuts. Nacra solved that on the Infusion by making the top forward deck relatively flush with the main beam. They wouldn't stop a pitchpole but maybe you can get a little lift out of it with those chines (or whatever you would call them).


I can't see the angle or additional buoyancy of the rails doing anything for pitchpole resistance, even in a modest bow down attitude. However, look at the low down hull buoyancy.

Cheshirecatman

Re: New Hobie F18? [Re: Cheshirecatman] #159902
11/07/08 07:03 PM
11/07/08 07:03 PM
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Posts: 1,884
Detroit, MI
mbounds Offline
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It's not like this is a new concept, although the implementation is different.

Shark Catamaran (check out the spray deflector on the bow):
[Linked Image]

If you look closely at these Cougar catamarans, you can see the same spray deflector (this is from 1965):
[Linked Image]

Re: New Hobie F18? [Re: mbounds] #159908
11/07/08 07:57 PM
11/07/08 07:57 PM
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Posts: 1,021
Australia
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I thought it was a handle for lifting the boat on the beach smile



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Re: New Hobie F18? [Re: macca] #159909
11/07/08 08:04 PM
11/07/08 08:04 PM
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+31NL
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Putting sponsor stickers on the bow will be a real pain with those spraythingies getting in the way.

Re: New Hobie F18? [Re: mbounds] #159910
11/07/08 09:03 PM
11/07/08 09:03 PM
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Posts: 266
UK
Cheshirecatman Offline
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UK
Originally Posted by mbounds
It's not like this is a new concept, although the implementation is different.

Shark Catamaran (check out the spray deflector on the bow):
[Linked Image]

If you look closely at these Cougar catamarans, you can see the same spray deflector (this is from 1965):
[Linked Image]


You can add:
Hellcat and other early c-class
Manta
Thai
Shearwater
Dolphin
Yachting World Cat

and I am sure many others. All 40+ years old.

Cheshirecatman

Re: New Hobie F18? [Re: macca] #159913
11/07/08 09:40 PM
11/07/08 09:40 PM
Joined: Nov 2005
Posts: 5,582
“an island in the Pacifi...
hobie1616 Offline
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“an island in the Pacifi...
My guess is the slots will be attached to tubes that vent out the stern. They will produce a rooster tail. That will bring in the powerboat crowd that can no longer pay for gas.


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Re: New Hobie F18? [Re: hobie1616] #159914
11/07/08 09:42 PM
11/07/08 09:42 PM
Joined: Dec 2007
Posts: 1,430
california
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Double Super Secret bow design.


Richard Vilvens
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PSA Capricorn USA
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Fairfield, Ca
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http://www.capricornsailing.com/
Re: New Hobie F18? [Re: F-18 5150] #159924
11/08/08 03:00 AM
11/08/08 03:00 AM
Joined: Aug 2002
Posts: 545
Brighton, UK
grob Offline
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It could also be to add stiffness locally, or just styling.

Gareth

Re: New Hobie F18? [Re: grob] #159927
11/08/08 08:11 AM
11/08/08 08:11 AM
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Detroit, MI
mbounds Offline
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Originally Posted by grob
It could also be to add stiffness locally, or just styling.

Gareth


DING! DING! DING! We have a winner!

Re: New Hobie F18? [Re: mbounds] #159944
11/08/08 04:24 PM
11/08/08 04:24 PM
Joined: Dec 2007
Posts: 1,430
california
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Its a pretty pretty that you don't have . My boat has them yours don't. Now you have to get one. Love the f-18 class.


Richard Vilvens
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PSA Capricorn USA
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Re: New Hobie F18? [Re: F-18 5150] #159951
11/08/08 06:16 PM
11/08/08 06:16 PM
Joined: Jun 2001
Posts: 3,116
Annapolis, MD
Mark Schneider Offline
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ahh... consider it character building to forgo the pretty pretty and just try to win with the basics!

But... if the contest is limited just to the bar after the race... Pretty Pretty has enormous rhetorical value and you should absolutely go for it.

Now curved banana boards in the A class that is a story yet to be told... so it could be worse!


crac.sailregattas.com
Re: New Hobie F18? [Re: Mark Schneider] #159952
11/08/08 06:22 PM
11/08/08 06:22 PM
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Posts: 531
Lake Murray SC
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Spray rails on the Cougar were a total failure...


Race cheap, race faster, Damnit!

E-Scow
24' ULDB

18HT hulls plus Gcat 5.7 rig = 18GT!
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