Many thanks Ray,
the idea was to help the promotion of this nice hobby with a practical exemple from A to Z.
May someone thinking to presents his work ! I hope.
Cheers
Claudio
PS: my thanks go to the ones that participated to the over 17000 lectures in 3 months !
Hi Claudio -
I must add my congratulations on a beautiful build, and also my thanks for taking the time to show the building steps. They are very helpful and you have also given me new ideas to try.
:lol: I suppose it is too early to ask what your next project will be?
Perhaps I need to convince you to try multihulls next :scared: - you do know they will probably use those in the next “CUP” ? As always, I do wish you well.
Warmest personal regards, Dick
I appreciate a lot Dick.
It was a pleasure to do it.
It is not too early asking because the next step is to presents the AC33 in scale 1:20 (almost), where the LOA is 120cm as for the existing AC120 class.
It could be a new tread !
I called ‘Fuxia’ waiting what will happen with the real AC.
and probably to build a new competition AC33 class M with a new cotton cloth … of course !
My best regards to you to,
Claudio
The New AREVA from Brescia(Italy)
Sorry the photo
Nice looking boat and nice enviroment, hoping the fishes are happy !
I do not reconise the Areva colors, it is a New Areva ?
Cd
Thanks Tiziano
got it !
Ciao
Claudio
This afternoon was the second trial after the modifications of the adjustments gadgets.
The week time was also spent to produce and reconditioning the 5 cells pack battery in order to get 6volts for the Arm servo that showed some limits at 4.8volts.
Today was much better but the wind was lighter between 3 and 5 knots.
It is not esluded that, in view of using larger sails surfaces, I will shorten the arm and increase the swing of some degrees. Actually are 115°.
The control of the base of the main need again some improvements, therefore news modifications on the vang and outhaul , will be introduced.
Today I took the time to verify also if my the design approach was paying off.
In fact the “flat bottom”, is not producing deep wave when running or reaching and a lot of energy can be spared when running.
To better explains my meaning I shows a couple of pictures taken today and compared with an old existing one pertaining to another Class.
Reaching:
it can be noticed the “Iron Effect” behind the stern ; the wave do not go high and seems like an Iron is passed over the water, or diffently, the boat behave really like an Iron.
Running :
As above the “Ironing” is evident and no deeping wave can be seen on the side
Observing this picture it is easy to see how is going deep the lateral side wave
The difference observed is probably due to the hull deept. The actual AC33 have a deept of 26mm while the others boats seen above, may be fixing this deept around 55mm or even 60mm.
Is clear on this picture that all the models exibit the same effect and producing an hollow wave at mid hull lenght.
Because it is my beliewe that a deep wave absorb much energy, I will try to study on how to find a compromise with my future hull designs.
In parallel I will continue the optimisation of the actual Class M AC33 in order to participate to competitions.
Cheers
Claudio
Congratulations! Claudio…
I am an aeromodeller considering building a boat, and being a Kiwi, the ETNZ is my first choice.
I have read this thread all the way through, and have come to the conclusion that even though my glassing skills are probably good enough that I am clearly out of my depth with all this skill, precision and math!
I will settle for the Thunder Tiger ‘toy’ for now and perhaps revisit a build based on all your excellent tutorials. [edit] Seems there are some good reasons not to buy the TT… my mind is a changin’ [end edit]
Thanks again
Goose (newbie) :zbeer:
Goose, before you buy the ETNZ kit boat would you like to phone me in Wellington on 479-4111. I would like to offer you some advise and I also have a couple of boats to sell. It may be a cheaper and better way to get started.
Cheers, Ian Hull-Brown.
Gidday Ian…
Thanks for your post.
FYI: I’m a Kiwi living in Canada… the ETNZ idea is to bring a little NZ culture into the frozen north and revel in the envy of this boat.
I have been building planes for over 25 years and have experience with fibreglassing, carbon fibre cloth and general construction methods tailored for lightness and strength. I should also mention that I have sailing experience from P-class, Lasers and windsurfers to Tornados and day sailors… not an expert by any means but can make them go 
Claudio’s plans and this thread convinced me that there is a lot more to this than I anticipated, although with the design work done, and the support of all you guys, a build doesn’t seem impossible… perhaps even a web build.
Let me know what you have and are thinking… I ship stuff from all over the world regularly so nothing is too hard.
Thanks a lot!
Goose
pure effing win! Wow, when you said near future, you really meant near future… Buy wow gold buy cheap wow gold wow gold
Sorry, didn’t mean or want to hijack Claudio’s excellent thread… moved to ‘Recommendations’.
Cheers
Goose
Here you go Claudio … looks like a great BIG “A” Class catamaran - something that has ben on steroids for way too long. At least it has a somewhat “quiet” look to the graphics (so far).
Time to get out the foam and have a go at this design - although I already had lines similar for the 65M (65 cm) multihull - only in trimaran form.
Added the little “A” Class photo as a comparison.
Hi Dick,
interesting bow line tilted backward as already done on SUI100, what it is suppose to hide in terms of performances ? I would be curious to knows.
From design point of view I’m totally ignorant for this type of boats.
‘OT’ = My PC was recovered saturday with a new power supply and today is back to the “doctor” because after a very frequent, too frequent in my opinion, Windows Updating, one Windows file is now “missing” and the PC is blocked again.
Hope my wife will not push me out from her laptop !
Cheers
Claudio
PS : to see some more here : http://www.alinghi.com/en/multimedia/photos/index.php?categ_vign=617&sous_categ_vign=1038
Claudio -
Will have to see how well it performs at this big size - especially tacking something this wide.
Cheers, Dick
Hi Dick
I do not think that the 1st point is a valid consideration because the “lenght/width” ratio is, in my opinion, far too high to introduce sufficient “lift” even at the expected high speed.
The 3rd point - I’m not totally sure of this, although may help, since the cross wind effect will be much greater on the orthogonal projection surface presented by the platform tilted at 5° also if it is just a net, unless this boat will not tilt at all…
Ciao
Claudio
The servo arm used was a HS815BB.
The swing angle was limited to 120° (140° allowed)
Apparently he did not supported to stay under pull load for some 10 or 20 seconds.
I was aware that at both swing extremes was making some noise when the sail was pulling.
The wind blowed around 9 knt therefore not very much.
Deceived, I will not use this servo again.
I’ll go back to my old Drum Servo !
Ciao
Claudio
I decided to recover an old servo used for my TUIGA and transfom it to a new one.
just two gears of 30T and 44T + the 10 turns potentiometer of 5k
the basic set-up :
the drum construction full carbon :
All parts glued with Loctite
Need to be tested before deciding to use it. One of my fears is that the drum base is 10mm far away from the servo axis compared with the standard. This will produce a cantilever effort.
Gain on weight will be the next step searching for a lighter support, lighter gears and hubs.
The pulling force is increased of about 68% - due to the drum dia 38mm standard against 26mm
The speed is reduced to 1.52sec/360° against the 1.4sec/360° of the HS-785HB at 6v.
The actual total weight is 168.55g against 119g drum included
Ciao
Claudio