I think you will be compromising the torsional rigidity of the wings with three pieces and relying on a bonded joint, ( I could be wrong here). There are lots of fuel resistant core materials available with which to do this. Would it not be faster, cheaper and easier, (consideration given to your location), to do a more conventional lay-up with a different core material. All the long-ezes and cozy types have been doing it for years. I've done lots of hot wiring in the past, there is a physical limitation of 5' that you can hot wire a profile. I have worked on quickies, dragonflies and long-ezes. We cut the cores in sections and then "VERY CAREFULLY" assemble them to form the main core. The KR wing is too long to wire cut without a lot of wire drag that will dish your wing shape.
-----Original Message----- From: KRnet [mailto:krnet-bounces at list.krnet.org] On Behalf Of Dene Sent: February-13-14 10:48 PM To: 'KRnet' Subject: KR> New wing skin idea Hi guys It is my plan to put full length wing tanks inside my wings between the spars but because it is common practice here to use polystyrene for a core and we all know what happens to poly foam when it even smells fuel, I have been trying to come up with a way to get rid of foam all together without having to produce a set of molds. I think I have a plan. The cores are hot-wired from foam blocks as usual but the core that we would normally use is discarded. The "female" form, which is cut with the washout already set in it laid out on a flat table. A thin sheet of mylar or similar is cut to the required dimensions and laid inside the foam form. Glass is then laid up on that with a core material. The skins can be made in three pieces: D box, centre section and trailing edge, all with "overlap" for bonding over the spars. All these can be bonded together over the spars. This method, if done carefully and accurately should produce a pretty fair wing skin that is strong, light and need very little fairing. Final washout can still be tweaked at final bonding. Any thoughts? Regards Dene Collett Avlec Projects cc Builders of award winning aircraft tel:27419560048 cell: 27845805003 Port Elizabeth South Africa _______________________________________________ Search the KRnet Archives at http://tugantek.com/archmailv2-kr/search. To UNsubscribe from KRnet, send a message to KRnet-leave at list.krnet.org please see other KRnet info at http://www.krnet.org/info.html see http://list.krnet.org/mailman/listinfo/krnet_list.krnet.org to change options
