As always, thanks for all the details on your build methods 
Thanks,
today is the 208st picture since February 2017.
After the deception about sliding jib box weight, I changed design strategy.
In spite of lower weight for the Savox Arm servo, I choose to go ahead with the Hitec winch. The Battery pack 2/3 AA cells of 6V-1600mA/h is also too heavy with 148g.
The Arm Servo would have forced to reposition the bonded station and I did not liked.
Changed central supports methods and presentation of servo winch and rear pulley at the right height before bonding.
Iâm still relying for the prototype on wood sticks, but next I could use carbon square tubes from 6x6mm to 8x8mm
progressing, but less then I was expecting.
Today tuning of the Jib box inside de shadows and with the peaked deck for the first time close together.
I observed some rotating small frictions over 80° turn.
Open the bottom of Jib Box to see what I can do. I will explain with a drawing in an other reply.
Fairlead constructionâŚ
As promised, here the drawing explaining the reasons for friction, I was suppose to know it before, but I missed and the bottom plate of the box too far to stop down sliding due to gravity !!!
I try to arrange what I have, if not OK a new one is needed !
Meanwhile Iâm working for a new and lighter model, full carbon !
After the frictions problems observed on the actual Radial Jib boom, I decided, also for curiosity, to anticipate the âEsterel 45â Radial Jib construction â Full Carbonâ.
I do also believe that is strong enough, but only trials will prove it. The boom itself is made with a carbon tube of 5.5mm diameter integrated into a 8mm tube.
The external supporting tube is 10mm. To avoid previous problems I have provisory inserted copper rings/collars that shall be bonded to the rotating shaft.
The weight drop from 46g to 18g !
After preparing some space I started the deck laminate composed of 1 layer of glass tissue of 105g/m² and 1 layer of 48g/m².
Actual panel size 40x70 cm² - laminated weight expected 87g.
Deck surface 18dm² therefore the expected deck laminated glass weight should be : 1.05 + 0.5 x 2 x 18 = 55.8g. One brush stroke more or less the weight may change by 5/6g.
The support is a 8mm Glass survived one of the many removals !
Later I will fix the forward pulley.
Claudio -
in looking at your drawings, would a chamfer in the top of the receiving tube have helped any? Perhaps you are far enough along that your changes have improved the binding of the boom as it swings out?
Hi Dick,
I do not think so, the carbon tube would have been be too brittle and fragile at the sharp corner and not helped very much if a stop was not made at the bottom as I did it inside the Box. Was not a good solution after all, but going on with what I have.
My future option will be to use a bonded rings and insertion of Teflon washer to reduce whatever frictions. see sketch.
My deck laminated is ready after polymerization. 0.2mm thick, hope will be sufficient. The laminated sheet weight 90g, thus 8g more then the calculations. Not bed at since overweight by 0.33g/dm² only. The deck should be around 60g before bonding the sheer line.
Today I started the most fascinating and critical activity of the construction : bonding of the Fin Box to the Hull.
I collected in a garage corner my old jig used years ago for that purpose.
The Fin is loaded at the extreme bottom with some 500g lead to ensure the verticality while the hull axis are checked with the water level. Load distributed inside as ballast to avoid hull movements. Bulb not used since too heavy for the purpose.
Bonding is carried out in two phases :
- Fin box inserted into the hull window and bonded along the contour base with normal epoxy resin loaded with micro-balloons, see images
- after 24hours verification of the mounting squareness before glass/epoxy lamination for reinforcement.
If I miss it, the job done so far is lost !!
Meanwhile continuing the new batteries reconditioning, take a lot of time !
The tricky job has started, it consist in preparing the deck and roof laminates.
The job would have been easier if a female mold was made. Too late now !!
Actually I have 3 laminated sections that shall stay together and this will cost some grams to joint them. I shall define a cross stringers strategy !
Having said that, I do also see, for the first time, the full Hull shape although the parts are still loose.
4 battery sets reconditioned.
Unfortunately Iâm âmomentarilyâ stopping work victim of an allergy to the left fingers caused by a New band aid used to cover small skin scratches. It never happen before in my life, went to the pharmacy and they told me that Iâm not the first complaining about ⌠Actually taking care with antiallergic pills every hour and ointment 3 x day. Here a screenshot, sorry for the unusual image
Hope it heals up quickly.
My kids have got an allergy to the glue on those things.
We now use the stuff thatâs on a roll that you cut.
Hope you will be fine soon.Gilles
Hi Andrew,
this is what I used !
Today is a bit better. Thanks
Claudio
Bonjour Gilles,
quel plaisir de te lire. Comment ça va ?
Ici un peu mieux, merci.
Jâespère dans deux ou trois jours de pouvoir revenir sur le bateau et continuer, en attendant, je travail au clavier pour dĂŠvelopper les supports internes pour faire le plus lĂŠger possible pour lâ Esterel 45".
Sur lâactuel â1290â je suis encore dans les clous pour le poids, mais sans marges. La bĂ´me de foc radial, mâa pris pas mal de grammes, les parois aussi et le pont pour ne pas avoir voulu faire un moule. La leçon est apprise encore une fois, mais le vieux oublie vite !! heheh !!! Salutations au QuĂŠbec
A+
Claudio
Finger affair is now fortunately an old story ! Since received the carbon tissue yesterday I started this morning the sheet lamination to be used eventually to make a fin. I suspect that probably I do have exaggerated with the tissues⌠will see tomorrow !
The fingerâs affair gave me the time to think all about this model design.
Unfortunately the Jib Radial boom setting up is to heavy, this include the supports.
Fearing to go overweight !
The main reason for this project was to test a Multi Chine Hull after reading the Alex Quartenmont paper.
The Radial Boom was an additional option that came in my head afterward.
A new development (see previous pages) is ongoing for the ESTEREL 45".
Conclusion : The time is passing too fast and I want to put this model in the water as soon as I can.
This morning I decided to remove all unnecessary parts and go for a Swing Rig already available from my previous Class M.
Probably the sail panels need revision.
Deck will be flat, no peaked deck needed.
In view of the decision taken, some re-arrangements at hull level are necessary, see new layout below and the empty bin.
Margin after weight measurements is of 210g.
BTW : The laminated Carbon-Glass sheet is 0.9mm thick and the Fin would weight 160g while my intention is to stay below 120g. New lamination needed !
This is time where patience is needed !
Iâm talking about the Mast and Keel alignment.
In between there the positioning of the Mast trunk.
Apparently, is spite of limited space around me, I think that an acceptable alignment is achieved.
Trunk full bonding required including lateral struts
see pics
102.2 °F average, max 104°F on the terrace, impossible to work, my heart will not appreciate !!
Carried out some work in the last mornings average 80°F.
Servo Winch installed and sheeting adjusted with swing rig simulation.
Deck reinforcements as deck laminated supports. Next time should be a monolithic hull and supports and trunks assembled outside hull and inserted after.
Deck laminates ready for bonding and adjusting. Perhaps tomorrow.
Weight inside the budget 4377g against 4483g and this is a good new in spite of all arrangements. Still missing Rudder Trunk and painting
This morning âpaintedâ the hull interior with slightly diluted epoxy with acetone in particular the areas where some leakages were detected.
Now 107.42°F on the terrace, non question to continue !!!