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hull form infusion vs 5.8/6.0 #285889
02/17/17 05:52 PM
02/17/17 05:52 PM
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Pam62 Offline OP
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Pam62  Offline OP
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Hi, can somebody tell me which one has the most volume before the beam?
And maybe someone has measured the hull plan of the infusion?

-- Have You Seen This? --
Re: hull form infusion vs 5.8/6.0 [Re: Pam62] #285892
02/17/17 06:17 PM
02/17/17 06:17 PM
Joined: Jun 2001
Posts: 12,303
South Carolina
Jake Offline
Carpal Tunnel
Jake  Offline
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Posts: 12,303
South Carolina
Originally Posted by Pam62
Hi, can somebody tell me which one has the most volume before the beam?
And maybe someone has measured the hull plan of the infusion?


Hull volume? Probably the infusion by a little bit - but the hull concepts are VERY different. If you are asking from the perspective of pitch-pole resistance, the Infusion is considerably more pitch pole resistant than any of the older, spherical bottom style, Nacras. The rocker location is different and the hull has more of a wide shape below the water line to better bridge the difference between two hull sailing and one hull sailing displacements.

I owned a Nacra 6.0NA for a while and have had an Infusion for several years.

Last edited by Jake; 02/17/17 06:18 PM.

Jake Kohl
Re: hull form infusion vs 5.8/6.0 [Re: Pam62] #285915
02/18/17 04:11 AM
02/18/17 04:11 AM
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Kingston SE South Australia
JeffS Offline
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Yep Infusion has much more buoyant shape but is a foot shorter, doesn't reach well but is made for up and back


Jeff Southall
Nacra 5.8 1667 Ram Raider
Nacra 18 Square
Taipan 5.7 134
Arrow 1576
Re: hull form infusion vs 5.8/6.0 [Re: JeffS] #285982
02/20/17 11:04 AM
02/20/17 11:04 AM
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Naples, FL
waterbug_wpb Offline
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Jeff has good points, although I always thought the 6.0 was designed just to kill/maim crew with the spin-zilla rear beam sheeting.

Of course, the 5.5 was even more fun with the wire running across the trampoline for the jib barberhauler.

And one of the desings had a pole running down the length of the middle trampoline. A wonder I still have kneecaps...


Jay

Re: hull form infusion vs 5.8/6.0 [Re: waterbug_wpb] #285986
02/20/17 02:18 PM
02/20/17 02:18 PM
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Posts: 473
Panama City, Florida
Redtwin Offline
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The 5.2 was the version with the "knee buster" bar down the middle. I sort of liked it because it gave me a place to put my foot for leverage.



Rob V. Nacra 5.2 Panama City
Re: hull form infusion vs 5.8/6.0 [Re: Pam62] #286010
02/21/17 06:29 AM
02/21/17 06:29 AM
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Kingston SE South Australia
JeffS Offline
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The 18 squares had knee breaker poles, thankfully mine has been modified


Jeff Southall
Nacra 5.8 1667 Ram Raider
Nacra 18 Square
Taipan 5.7 134
Arrow 1576
Re: hull form infusion vs 5.8/6.0 [Re: Pam62] #286322
03/03/17 09:03 AM
03/03/17 09:03 AM
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Solomon's Island, MD
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samc99us Offline
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I'd argue that the Infusion has more hull volume than the more modern 6.0 incarnation, the Nacra 20. I've sailed extensively on both, and the one thing the 20 does better is light air sailing, its a little lower drag hull shape in pre-planning mode (under 10kts of breeze) but more waterline and sail area are the biggest factors.

On a reach, I'll take the Infusion with the rig dropped back one or two pin holes , driver in the rear foot strap and crew just on the rear beam pushing hard over almost anything else. It's like being in an Audi R8 vs. the Nacra 20's A6, I know because we ran down the 20's like they were sitting still last year blast reaching in close to 20kts. The only better boats are 10' wide or maybe the Cirrus R and Falcon F18's which have another 25% volume over the Infusion. The Cirrus R has never shown good performance in light to medium conditions (anything below double trap) and the Falcon I think is lacking a little bit of rocker and the foils are a bit too narrow, but it can be made to perform and if its reaching it is blistering quick, Mike and Tripp were ~25 minutes in front of the next F18 team at the statue race in 2014 and that next team was ranked top 10 in the country so not exactly slow. Its also well built and Matt's service is second to none. Between the Infusion and C2 reaching its a toss, the C2 is a little faster downwind in light air (slightly narrower hulls) and the Infusion faster upwind (stiffer rig, deeper, higher aspect boards yet still forgiving). In medium conditions its a wash and the Infusion may be slightly faster in breeze but usually the man or gal on the end of the stick matters more.

What will be interesting to see is how the new Cirrus R2 and Exploder F18 perform, as well as the Edge. The Phantom F18 has a proven track record as well but they aren't building F18's anymore.

In the 20' space, I'll say the Tornado is a rocketship on all points of sail, though requires footing a bit upwind compared with the newer boats w/ deep daggers. The F20c and F20FCS are also fantastic boats with advanced rig designs and effectively extended Infusion hull shapes. They are very powered up beasts though, hull flying upwind in 5-6kts of breeze with equivalent boatspeed. Not for the faint of heart, especially when the whole boat comes out of the water (C board boat) and you have 300 sq. ft of spinnaker up in 13-14kts of breeze...pull those C boards up a little and you have a very very stable ride that is pretty pitchpole resistant with the beam, length, hull shape and foils all working to your advantage.

Something else to consider, most of the 5 and 6 series Nacras are well over 20 years old and most not kept to the standards a racer would, the parts aren't cheap and aluminum doesn't last forever in a marine environment, especially without a fair bit of care! I would go for an 07-09' Infusion first, fit the longboards if serious about class racing (price has come down, last quoted at ~$2100 for the set), but enjoy the boat as-is for a while. With F18 worlds coming up in 2018 its never been a better time to join the class!

Last edited by samc99us; 03/03/17 02:00 PM.

F18 Infusion
Re: hull form infusion vs 5.8/6.0 [Re: Pam62] #286359
03/05/17 07:16 AM
03/05/17 07:16 AM
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Pam62 Offline OP
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Pam62  Offline OP
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Thanks all and especially Sam for the extensive explanation.
The background of my question was that I wanted to know what makes one boat more pitchpole resistant than another. I own a nacra 5.8 but would want a 28 foot catamaran. There are a few KL28's on the market (in Europe) but they have category D designation. I trying to find out what would be necessary for cat A/ B. (ISO12217-2,: 2013). One of the parameters would be hull form. Still working on that.


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