Don’t worry Stefano ! the pack is a Ni-Mh.
I watch the bulb to avoid reverse voltage !!
Cheers
Claudio
There are some delays , too windy, plus varnish and sheets changes.
While waiting a better meteo I starded the sail costruction and rig for the AC33 configuration.
Because the Head of the Main is rather large, there is a need to have a sort of support either with ribs, rigid panel or a bar :
The carbon tube bar is pivoting around the mast via a soldered copper ring.
the sail and the semi-rigid panel cut from the carbon/kevlar laminated cloth used for the deck.
The basic elements for a solid and light construction of the peak :
A definitive decision is not yet taken , any suggestions ? thanks
Claudio
On my experience with my large head of Main sail, you don’t need a carbon support. I suggest you to use two/three oblique sticks in carbon
(half millimeter diameter) as the real AC Main sails. Watch the Mainsail of my Alinghi SUI-100:
Regards
Mat
Thanks Mat ,
I will consider your suggestion, the point is that I should procure tiny carbon sticks of 0.5mm
My sail head will be only 130mm wide.
Nice picture, but I notice that the anchoring point to the mast for the forestay, seems to me, that is not at 80% of the Main luff, or probably I’m wrong ?
Cheers
Claudio
Claudio, if I have understand your question, the class rule tells that the Headsail height have to be maximum the 80% of Main Luff lenght, the Headsail anchoring point to the mast is not considered.
Mat
Hi Mat,
your are right !
I went reading the Rules and this is what I have understood : jib leach = Main luff x 0.8
Therefore, standing as is, nothing would forbid to anchor the forestay at the top end of the mast !
Others, well known rules, specify, for a Bermuda type rig, that the forestay “anchoring point” to the mast, should be not above 80% of the Mast height, composed of the main luff lenght and the distance between the main base and the deck or something like that.
Under this condition various interpretations could take place like the use of a “Top Jib” as in the “J Class”.
Probably I got something wrong !!! sorry Mat.
Cheers
Claudio
Mat, you were right !!!
I have checked and does’t work proprerly, was not a good idea, so is out !!.
Instead this configuration alone is OK for the time being !!
Cheers
Claudio
Insolite view !
balance chek with the M Rig - the full boat CG is 250mm from the bottom of the bulb with fin Up and at 256mm with Fin Down. For the records the fin is Up/Down adjustable for 30mm.
Finally the full weight (M Rig) is : 4445g against the design of 4225g.
The situation is non so drammatic, because there is a supplementary lift of 126g coming from the fact that the hull was “externally” laminated. Assuming a hull thickness of 0.3mm spread all over the 4200cm² of the hull surface, we have : 4200 x 0.03 = 126cm3.
Therefore the overweight is only 94g that will force an additional deept of 0.5mm - almost nothing !!!
The other Sail Plan of the AC120 type of 74dm² under the Venus’s control !!!
This serie of pictures conclude the full AC33 design & construction started the March 15, just 3 months ago
The next pictures will arrive, I hope, from the water side !
Cheers
Claudio
Beautiful boat! I can’t wait to see the maiden voyage photos.
Thanks,
hope will be good on the water to.
I’ m ready to goooo!!
Cheers
Claudio
Geart looking boat, and nice maiden of the sea behind you!
We’re all waiting impatiently to see how she sails.
Don
You are not the only one !
Ceers
claudio
I have some bad news !
the wind is going to blow for the next 7 days between 14 and 18 kn.
The idea is to do the first test at 5/6 kn and no more.
This situation is rather unusual for this season where the winds are generally below 3/4 kn
Cheers
Claudio
This is my meteo site : http://www.windguru.com/fr/index.php?switchlang=1
It can be used also in USA close to the beaches it is special for surfing and kites.
Finally I did it !!!
It was a windy week , but tired to wait and today since appeared to be a reasonable day with 7kts to 9 kts and some bosts to 10/12kts , we decided to GO !!
Just to tell immediately ! the results are very good since the first time in the water. I just very HAPPY ! Far better than expected !!
I was fearing about the capability to close the wind as mention in many magazine and books about the VOR and Open 60 boats.
These are the good aspects :
1 - Very good lateral stability in spite of a short fin of 43cm and 2.85kg bulb
2 - the centering appeared very good as soon in the water - this was the case for both type of Rigs
3 - Docile to the commands responding very well
4 - manouvrability and changing direction very easy
5 - closing the wind rather easy in spite of my fears
6 - accelerations very good under wind boosting , the nose appears to lift a bit !!!
7 - Surpringly very good stability when Running - no need to use the rudder command !!
We tested both rigs, the tipical Class M type A of 7100cm² in spite of the fresh wind and the AC120 type of 7400cm². Larger surface but shorter mast of 160cm against the Type A of 210cm.
Was too windy to really appreciate eventuals differences, therefore this comparaison will be repeated more often. I can anticipate that the CE height differs of 9cm in heigt.
the less good aspects :
1 - The overall sheeting cords set up deserve a good revision with good quality bowsies and adjusting oppurtunities
2 - The Servo Arm has diffulty pull and harden the Main sheet after changing direction.
To note that the battery used was 4.8 volts and 1000mA/h - before deciding a servo configuration change, the tests will be repeated with a 6 volts battery (50g more)
That’s all for now, the results so far obtained are very positives as such to encourage a new construction and to publish the plans for the AC33 of 120cm lenght
Some shots : (I do not have movie camera) waiting a friend !
The above shots are made with the AC120 Rig of 7400 cm² tested as first configuation fearing too strong wind .
Cheers
Claudio
These shots are the one taken with the M Rig type A in spite of the wind bosts and because encouraged by the lateral stability obtained even with a relative short fin and a small bulb. ( 2850g against a nominal 3000g for the M Class.)
Often the sails could not be properly adjusted because of the sheeting deficiencies.
Cheers
Claudio
Some more pictures that’s all I have ! In July it is possible a movie !
One thing of interest is that the boat do not produces wave during running - this is because the hull is not very deep, only 26mm. This fact result in a very fast boat since the wave resistance is very low !
Cheers
Claudio
Hello Claudio
congratulations :zbeer:, beautiful boat, well done.
I also read your e-mail with your thoughts on the evidence … is perfect.
When will I be in a few days on vacation with his family to St.Aygulf so I will have to see it live and then to make the video.
Hello
Stefano
Thank you Stefano.
Leakage identified !
Following the suggestion of my dear friend Pierre , I started inspiring all along the bond deck/hull.
In various points the air is passing through !!!
Claudio
Claudio, a superb conclusion to an excellent build log. I thank you for sharing your ideas and techniques, some of which I’m going to borrow. Enjoy the results…
Ray