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Gunboat G4 Foiling cabin boat #278351
04/12/15 01:25 PM
04/12/15 01:25 PM
Joined: Jan 2008
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Portland, Maine
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ThunderMuffin Offline OP
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It was just about this time last year when we were all dazzled by the spectacle that was the Phantom and the N20FCS and GC32... now Gunboat has managed to make a cat that has berths, galley and a head fly... amazing.

https://vimeo.com/124676763

-- Have You Seen This? --
Re: Gunboat G4 Foiling cabin boat [Re: ThunderMuffin] #278359
04/13/15 01:30 AM
04/13/15 01:30 AM
Joined: Jun 2009
Posts: 519
Petten Netherlands
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northsea junkie Offline
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Indeed, amazing.

But I doubt if the balance is correct. The hulls tend to lean a bit forward. Pitchpoling!

(and the crew look like a group posh chickens)


ronald
RAIDER-15 (homebuilt)

hey boy, what did you do over there, alone far out at sea?..
"huh....., that's the only place where I'm happy, sir.
Re: Gunboat G4 Foiling cabin boat [Re: northsea junkie] #278361
04/13/15 07:01 AM
04/13/15 07:01 AM
Joined: Jun 2001
Posts: 12,310
South Carolina
Jake Offline
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Originally Posted by northsea junkie
Indeed, amazing.

But I doubt if the balance is correct. The hulls tend to lean a bit forward. Pitchpoling!

(and the crew look like a group posh chickens)


I can vouch that at least some of the crew are quite experienced sailors and foilers. This is not a low budget or corner-cutting operation. I agree, though, it did seem a little bow-down for a lot of that video but it seemed to slice through the waves while staying on foil.

I think your impression of the people was one they were actively trying to portray (perhaps with a little "tongue in cheek")...a relaxed foiling experience....whether that's reality or not, I guess time will tell.


Jake Kohl
Re: Gunboat G4 Foiling cabin boat [Re: ThunderMuffin] #278363
04/13/15 08:22 AM
04/13/15 08:22 AM
Joined: Dec 2005
Posts: 1,121
Eastern NC, USA
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tshan Offline
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I like how they cut in scenes at anchor in the midst of the foiling scenes. Makes it seem rather posh to go foiling.

Beautiful boat and quite the foiler.


Tom
Re: Gunboat G4 Foiling cabin boat [Re: Jake] #278364
04/13/15 08:37 AM
04/13/15 08:37 AM
Joined: Jan 2008
Posts: 3,655
Portland, Maine
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ThunderMuffin Offline OP
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Originally Posted by Jake
Originally Posted by northsea junkie
Indeed, amazing.

But I doubt if the balance is correct. The hulls tend to lean a bit forward. Pitchpoling!

(and the crew look like a group posh chickens)


I can vouch that at least some of the crew are quite experienced sailors and foilers. This is not a low budget or corner-cutting operation. I agree, though, it did seem a little bow-down for a lot of that video but it seemed to slice through the waves while staying on foil.

I think your impression of the people was one they were actively trying to portray (perhaps with a little "tongue in cheek")...a relaxed foiling experience....whether that's reality or not, I guess time will tell.


The daggerboard wells have three separate fore-aft adjustable positions 31cm apart. They're using this one as the "test" to figure out the best position.

Re: Gunboat G4 Foiling cabin boat [Re: ThunderMuffin] #278365
04/13/15 08:47 AM
04/13/15 08:47 AM
Joined: Dec 2001
Posts: 5,590
Naples, FL
waterbug_wpb Offline
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anything that can foil at 20+ knots while blending my favorite beverage and has hot showers ready gets my vote (and money if I win the lottery)... regardless of how the bow looks smile


Jay

Re: Gunboat G4 Foiling cabin boat [Re: ThunderMuffin] #278367
04/13/15 09:35 AM
04/13/15 09:35 AM
Joined: Nov 2008
Posts: 69
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Lost in Translation Offline
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In my experience, foiling a little bow down is more stable than foiling a little bow up. As the boat lifts in that attitude, it doesn't build towards increasing lift and spiraling up until crashing down. Oracle's AC72 often was a little bow down as well.

This is different from "foiling" with C boards in foil assist configurations where you want the bow up all the time and the sterns still planted in the water.

Maybe they want perfectly level flight, but I think they looked very good and very in control, something everyone will want and need when sailing a 3 ton, 40 foot cat.


Re: Gunboat G4 Foiling cabin boat [Re: northsea junkie] #278369
04/13/15 12:50 PM
04/13/15 12:50 PM
Joined: Sep 2004
Posts: 2,584
+31NL
Tony_F18 Offline
Carpal Tunnel
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Originally Posted by northsea junkie
Indeed, amazing.

But I doubt if the balance is correct. The hulls tend to lean a bit forward. Pitchpoling!

(and the crew look like a group posh chickens)

I think it might look more bow down than it actually is due to the "fat" stern though.

Re: Gunboat G4 Foiling cabin boat [Re: Lost in Translation] #278371
04/13/15 03:15 PM
04/13/15 03:15 PM
Joined: Sep 2002
Posts: 3,222
Roanoke Island ,N.C.
Team_Cat_Fever Offline
Carpal Tunnel
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Roanoke Island ,N.C.
Originally Posted by Lost in Translation
In my experience, foiling a little bow down is more stable than foiling a little bow up. As the boat lifts in that attitude, it doesn't build towards increasing lift and spiraling up until crashing down. Oracle's AC72 often was a little bow down as well.

This is different from "foiling" with C boards in foil assist configurations where you want the bow up all the time and the sterns still planted in the water.

Maybe they want perfectly level flight, but I think they looked very good and very in control, something everyone will want and need when sailing a 3 ton, 40 foot cat.



Bingo!


"I said, now, I said ,pay attention boy!"

The cure for anything is salt water - sweat, tears, or the sea
Isak Dinesen
If a man is to be obsessed by something.... I suppose a boat is as good as anything... perhaps a bit better than most.
E. B. White
Re: Gunboat G4 Foiling cabin boat [Re: ThunderMuffin] #278448
04/18/15 02:57 PM
04/18/15 02:57 PM
Joined: Dec 2007
Posts: 1,430
california
F-18 5150 Offline
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california

Last edited by F-18 5150; 04/18/15 02:57 PM.

Richard Vilvens
Brand Ambassador
PSA Capricorn USA
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Fairfield, Ca
F-18 5150

http://www.capricornsailing.com/
Re: Gunboat G4 Foiling cabin boat [Re: F-18 5150] #278449
04/18/15 05:16 PM
04/18/15 05:16 PM
Joined: Jan 2005
Posts: 6,046
Sebring, Florida.
Timbo Offline
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Sebring, Florida.
Originally Posted by F-18 5150


Yeahbut..think of the sunsets1


Blade F16
#777
Re: Gunboat G4 Foiling cabin boat [Re: Timbo] #278450
04/18/15 06:13 PM
04/18/15 06:13 PM
Joined: Dec 2006
Posts: 2,490
On the Water
P.M. Offline
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On the Water
Originally Posted by Timbo
Originally Posted by F-18 5150


Yeahbut..think of the sunsets1

Insurance rates for foiling cruising cats just tripled


Philip
USA #1006
Re: Gunboat G4 Foiling cabin boat [Re: ThunderMuffin] #278453
04/18/15 08:06 PM
04/18/15 08:06 PM
Joined: Sep 2002
Posts: 3,222
Roanoke Island ,N.C.
Team_Cat_Fever Offline
Carpal Tunnel
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Roanoke Island ,N.C.
If you're on the cutting edge , ya might get cut.
It's righted and back at the dock. Nice to see that they were pushing it hard enough for that to happen.


"I said, now, I said ,pay attention boy!"

The cure for anything is salt water - sweat, tears, or the sea
Isak Dinesen
If a man is to be obsessed by something.... I suppose a boat is as good as anything... perhaps a bit better than most.
E. B. White
Re: Gunboat G4 Foiling cabin boat [Re: ThunderMuffin] #278457
04/18/15 11:14 PM
04/18/15 11:14 PM
Joined: Jun 2003
Posts: 712
mikekrantz Offline
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very cool that they were able to right with the mast and mainsail intact!


Re: Gunboat G4 Foiling cabin boat [Re: F-18 5150] #278461
04/19/15 02:57 AM
04/19/15 02:57 AM
Joined: Jun 2009
Posts: 519
Petten Netherlands
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Petten Netherlands
Originally Posted by F-18 5150


That shows exactly my point which I made earlier.

This Gunboat is nothing more than an overdressed sports-catamaran. And like each sport catamaran, it can flip and it can pitchpole.
And when that happens it's a super-heavy unmanageable cat.

The original promo video, showing lounging white dressed yups drinking champagne during sailing, is foolish. They had no lifevests on, so they were all lucky to survive soaked on their capsized dreamboat.

This forum is fooled by this Gunboat mirage.



ronald
RAIDER-15 (homebuilt)

hey boy, what did you do over there, alone far out at sea?..
"huh....., that's the only place where I'm happy, sir.
Re: Gunboat G4 Foiling cabin boat [Re: ThunderMuffin] #278462
04/19/15 03:34 AM
04/19/15 03:34 AM
Joined: Jul 2007
Posts: 976
France
pepin Offline
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France
It's apparently exactly the same failure mode as Paprec Virbac, the classical Extreme 40 capsizes, or the big off Team NZ got at the last america's cup: You can't dump an hydraulic mainsheet instantly.

I expect the G4 will be equipped with a tilt sensor linked to an instant mainsheet release of some sort in a very near future.


Re: Gunboat G4 Foiling cabin boat [Re: ThunderMuffin] #278464
04/19/15 07:14 AM
04/19/15 07:14 AM
Joined: Aug 2011
Posts: 774
Greenville SC
bacho Offline
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Greenville SC
I read that gunboats had a automatic sheet release as a safety. Seems like I read PJ say that it would dump the sails before flying a hull when activated. I would guess it's something that can be overridden.

Seems they would really need a good/fast system on the G4.


Re: Gunboat G4 Foiling cabin boat [Re: ThunderMuffin] #278468
04/19/15 01:37 PM
04/19/15 01:37 PM
Joined: Jul 2007
Posts: 976
France
pepin Offline
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pepin  Offline
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France
Watch the capsize video: no release of the main, it just went sideways…

Re: Gunboat G4 Foiling cabin boat [Re: ThunderMuffin] #278469
04/19/15 03:07 PM
04/19/15 03:07 PM
Joined: Oct 2002
Posts: 307
maui
jollyrodgers Offline
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maui
Dyslexic driver, maybe steering is slightly backwards when keeping the boat up on foils. Anyway they took that gust up instead of down from the get-go.

TNZ wasn't really the same. They have a sheet with a winch for letting the wing out. Their problem was no hydro to tack the wing. As i understand it, they had to physically tack the wing using hydraulic controls and that had a lot to do with how fast they could tack and jibe. It seemed to me they may have been bringing the boat through the eye of the wind partially using the wing.

If Ronald is correct about the no life jackets, they will probably start wearing them after this.

Re: Gunboat G4 Foiling cabin boat [Re: ThunderMuffin] #278471
04/19/15 04:39 PM
04/19/15 04:39 PM
Joined: Dec 2006
Posts: 2,490
On the Water
P.M. Offline
Pooh-Bah
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On the Water
Agreed. You would think the helm had enough experience to not head up. Hard to tell in the video but it looks like he might have loaded up the lee rudder and lost authority due to ventilation. I would wager we'll see second generation rudders with a bigger winglet and more chord.


Philip
USA #1006
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