The Fin
Integration of the alluminium strip and adding a layer of glass in order to compensate the thickness. Half Fin represented in this picture
close-up
The holes will help to obtain a better adhesion strenght.
Claudio
The Rudder again !
as is
Claudio
Fin section view
The carbon rod glueing on the leading edge
Claudio
The rudder End of story !
Some finishing with wet sanding and painting !
That’s all !
Claudio
Claudio.
That looks great! With the press, do you use a high density foam to get the poly to wrap around the fin shape?
Andrew
Hello Claudio…Brescia is here
Hi Andrew,
no only a medium soft foam like that :
Cheers
Claudio
Nice also !
Ciao
The Fin again
I do expect an additional 45/50g for 3 carbon layers of 95g/m².
Claudio
Preparing for the fin carbon/epoxy lamination… 2 layers of 93g/m² and 1 layer of 180g/m² cut at 45°
The cloth weight will be higher and the projected weight will be around 170g
Protecting the rods from the resin polimerisation. simply plastic tape .
Cutting at 45° - (one layer)
Controlling the cloths weight in order to prepare the same amount of resin. To note that the actual cloths are larger then the fin dimensions therefore the resin will be in excess of what really needed. Generally, I never forget that the weight is an important parameter. There is no sense to use more resin of what really needed even because the only gain is ‘weight’ .
During lamination
Claudio
The press elements :
IMPORTANT !!!
The wooden plates shall be kept parallel as such to procure the same pressure to the foam and, more importat, to obtain a straight fin otherwise will be good for the garbage…
The Press : I tight the clamps as such that the foam is compressed to about 60%
Claudio
Claudio! Incroyable!
Félicitations! Très impatient de voir l’engin dans l’eau!
(In English: Congrats, can’t wait to see the beast in the water!)
Salutations,
Olivier.
Claudio,
It’s amazing how the waterplan of an AC33 when tilted 30 deg. looks like and un-tilted AC120!
Hi Olivier,
nice to see you here !
Indeed, it is very interesting to see how differents are the two water plans at 0° and when tilted at 30°.
Being for the moment an experimental model, I’m curious for the future ! Actually one thing disturb my mind and it is the high prismatic coeficient of this hull, on the other hand it should be the one that may authorizes an higher speed ! who knows ! Definitively I need to wait…
Cheers
Claudio
The Fin is almost ready !
New to me, the polyane film is partially stiky to the carbon surface and I ignore the reasons !
Disturbing a little; the wet sanding will arrange this !!
The Fin is lighter than expected by 15g
Just a trial with my funny bulb !
Some wet sanding work to be carried out, but outside is raining cats & dogs.
I will keep busy anyhow by fixing the wooden strips around the deck line borders of the hull …
Claudio
I think it should be fast on calm waters, but you are right, it is so hard to tell until you actualy test it.
Looks like you are getting close! Thanks for sharing your progress.
On my 2 SUI100, I am making the bulb adjustable (forward and rear, I can slide it and lock it in so I can adjust the CG if I am not satisfied with the behavior) Once I find the ideal position, I will lock it into place for good.
Regards,
Olivier
Good idea Olivier !
once you find out the definitive position, I would suggest to insert a tube (brass) and filling up all the space around it with some compound like loaded resin, to reinforce the area. Lead is very fragile and it easy to get deformations.
Ciao
Claudio
ciao Claudio…
Look this
Hi Tiziano
it look like a very nice mechanical masterpiece. Alluminium ? What is the weight of the structure ?
Ceers
Claudio
Setting up the hull !
Wooden strips 3x5mm glued all around the deck lines
Dummies carton frames, momentarily inserted, just to ‘recover’ the deck shape. Mini beams will be used to keep the form until the deck mounting.
This is necessary because I do not have a female mould when all integrations operations could be carried out keeping the hull inside the mould without the risk of hull deformations.
This easy situation of course, in this actual AC33 construction, is not available for the time being.
Today is not raining , so I can finish the Fin and start preparing for the ‘fin box’ construction.
The rudder tube will be better mounted, increasing strength.
Claudio