This project aims to create a 1:25 Wally 100 Tango model: LOA=1219mm, beam=288mm
Covid crisis and minimal ressources: a 28″ screen, openSCAD, some paper, two block of styrofoam, 3mm plywood… and a lot of “week-end” time.
- composite hull because we are in the 21th century … and to keep the weight low
- fiberglass Vs carbon to be more easily repairable
- one hull is needed, I go for the lost (not really) mold method – The plug is used to build the final part directly. It is lower cost, faster and avoid me to store the mold after… the time saved on sanding/finetuning the plug will be use on the final part
- 2 layers of 160gr/m2 sergé fiberglass cloth
- Slow epoxy resin
- Epoxy black RAL 9005 pigments
2020, May 2-3:
Nothing much to do, still waiting for the delivery of fiberglass cloth. packing tape and mold release wax applied.
2020, May 6:
Hull lost mold fiberglassing.
The color is useful during fiberglass impregnation, it helps to make it even. It creates also a base for the hull final color, perhaps allowing less paint job.
2020, May 9:
lot of sanding (reducing a bit the previous fiberglass layers), epoxy putty to level properly the surface, sanding, the structural finishing double 160gr/m2 fiberglass layers, ultra light sanding, epoxy putty and final sanding!
2020, May 10:
Here’s come my 1200mm wally tango hull ! 😎
Resin/Pigment/Putty/fiberglass total cost: ~50 Euros.
Weight of the untrimmed hull: 720gr.
I still have to trim a big part to the deck limit. I will probably land around ~600/650gr which is not bad at all considering it is a 1200m stiff hull with at least 2 layers of 160gr fiberglass. It should be able to take some rough hits.
Borders: Light bulkheads with 3mm plywood and border are shaped with 3mm balsa. It aims to provide a light structure easy to finetune. I will see if an added G4 primer will provide enough strength or I will simply fiberglass the wood…
3mm Balsa custom insertion
Trimming and sanding
Second layer of 3mm balsa on top and bevel
Rudder and fin
The rudder is 4 layers of 160gr/m2 fiberglass encapsulated between plywood and shaped. The middle fiberglass is for stiffness and leading/trailing edge hardness. 19cm, 30gr
The fin is from center: 4 layers of 160gr/m2 fiberglass, balsa 3mm, 2 layers of 160gr/m2 fiberglass covering and fixing the middle shaped carbon tube of 8mm. The middle fiberglass is a bit for stiffness and mainly for leading/trailing edge hardness. The carbon tube has two purposes: stiffness and holding top/down brass knurl nuts.
40cm, 7.5mm thickness, 87gr, bending 17mm with 1600gr bulb.
Keel box is built on the fin: unidirectional carbon 200gr and multiple layers of fiberglass.
Keel box settled in the hull, rock solid and light weight: epoxy glue against the hull, high strength unidirectional carbon 200gr stratified web over the box head and bulkheads, one layer of fiberglass 160gr over the seal (box / hull). I used black pigment in my resin to ensure visual control of the epoxy resin covering, it looks a bit messy but still very useful.
The front is prepared and reinforced to hold the jib stay and possibly a classic headsail like the real 1:1 tango… but I will probably finish with a classic RC jib boom.