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Kristof,
I am curious about your CNC machine. What make is it? I have been studying up on CAD programs some and have started looking into machines. R&G, I need to place an order with you guys soon... Hopefully your atypical European winter has calmed down! And thanks for the link! Gerald |
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Thread OP
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hi,
the speed is ok now , i get 8500mm/min i use a 1.6mm ,2 flute cutter(no ball end) to cut the cores , main reason for that : i wan't a 1.6mm gap for the aileron's and i used a 1.4mm precured rod as for spar this time.(it fit's that slot nicely) the bottom side is cut first indeed , for the second halve the rohacell fit's into a deeper cut negative so it's exactly positioned and the airfoil is perfectly cut. i can just load the file anytime and start cutting... -kristof- Quote:
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Thread OP
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hi,
i pulled a second wing today and results are good! i used 25gr glas for skin like i use on the tail's torsionally it need's more stifness, bending is ok. CF d-box should take care of it weight 107 gr. -kristof- |
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Is there a reason why you did not tie the carbon patch on the top of the wing to the spar? A good engineering technique to eliminate stress risers is to taper the reinforcements rather than end the square. That creates high concentration of stress and if the wing fails I guarantee you that there is where it will break. Great weight although.
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Thread OP
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hi,
i mean to build it with a d-box(wich will take care of this problem) i just wanted to see if the spar looked ok and the LE reinforcments too. the patches were put in to use the wing if possible , torsional stifness is very low so i doubt i will put servo's in. but i know this method works out now so i can build a d-box next time . -kristof- |
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Thread OP
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hi,
new fuselage mould's are cut , the fuse can take 2 big servo's now (side by side) and the canopy has a straight hinge line now so the canopy itself can be taped(hinge) and on the other side held by a magnet. also the vertical can be mounted like on the drawings in post 1 now the fun part can begin , wet sanding and polishing! last picture is the new wing on an old fuse. -kristof- |
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Thread OP
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first fuselage!
hi,
the first fuselage of this new mould is curing for the moment , evrything wen't well(experrience has something to do with it i guess) i expect it to come around 40 gram , i could get a few gram's of probably but this one will be very stiff) my new zone v2 mould's are polished and ready for usage. i'm cutting a negative vacuum plate for the moment so cutting rohacell cores will be something for tomorrow and hopefully the day after laying up a new zone wing. -kristof- |
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Thread OP
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pictures of the new zone v2 mould's
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Thread OP
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improved rds
hi ,
i've been working on my rds system and made an important improvement. i made a alu transition part between coupler and cf tube, this way i can tighten the set srew witouth crushing the cf tube. i got it at 4 gram's / servo now (coupler, wiper , pocket). here are some pictures . the carbon tube and the alu transition piece are gonna get wrapped with a carbon sock to add torsional stiffnes. -kristof- |
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Carbon and aluminum combination is tricky. You need to paint one or the other of them with a non-conductive primer of some sort before bonding them together. You want no possibility of direct contact. Othwise, you experience galvanic corrosion and the joint will fail. It is only a matter of time.
You can further reduce weight if you wish, by tapering the aluminum where it goes over the carbon. Gerald |
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Thread OP
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gerald,
just came up with a solution for that AND it reduces the weight too. i will grind 2 flat sides on the alu piece on the side were the carbon tube goes in and also make it thinner in the middle . so the carbon sock will hold evrything together also... -kristof- |
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