How would you hollow out the fuselage if you cut it out of one block of foam?
On Tue, Mar 17, 2009 at 6:13 AM, Peter Braroe <peter.bra...@newsmachine.com> wrote: > Hello all! > > > > Here are some thoughts: > > > > Precision > > Actually airplanes are a big like boats, not very precise. Consider a bunch > of aluminum panels put together by hand with rivets, or wood spars with > cloth covering. I fly two different Cessna 172s and they are supposed to be > identical but have very different feel to them. I think +/-1 mm or worse > would be fine. Probably 1 mm per meter of range would be OK too, especially > if any error is symmetrical. Look at a 10 meter long wooden airplane from > the 1930s - they fly fine - and I would be very surprised if they had > millimeter precision! > > > > Dimensions > > The wing isn't very thick - perhaps only 4 inches or so. A bit more if it is > to be done in one block with the "dihedral" i.e. the vee-in-the-middle. The > fuselage would be no more than 1,5-2 meters from the lowest point to > highest. Less if the "empennage" (i.e. tail feathers) would be made > separately. If one wing where to be made at the time they would be 5,5 > meters each, and the fuselage would be maybe 8 meters - less since the > engine cowling would be made separate. > > > > Assembly from smaller parts > > This is of course an option - but wouldn't it be nice to just put a big > block up and have "instant airplane"! Just add the skin. but I agree that > it's probably wiser to calm down a little and limit the size to say 6 x 1,6 > x 1,6 meters or so. Even that is of course massive! Then one could do one > wing at the time and then the fuselage. > > > > I am thinking perhaps assembling a frame from scaffolding tubing - then it > can be disassembled too! > > > > The main thing I am thinking about is how to make something work over such a > long distance as 6 meters. Perhaps a linear motor and a bicycle chain(s) > with a tensioner could be used for the long axis? Those parts are plentiful! > How to make an accurate sensor is then the question. Although if a beefy > stepper operates the chain cog and an initial calibration is performed then > perhaps that is good enough. > > > > Has anyone attempted something like this before? Ideas? > > > > Perhaps I will try to build something smaller first and experiment! > > > > Best regards, everyone! > > > > /Peter > > > > > > ------------------------------------------------------------------------------ > Apps built with the Adobe(R) Flex(R) framework and Flex Builder(TM) are > powering Web 2.0 with engaging, cross-platform capabilities. Quickly and > easily build your RIAs with Flex Builder, the Eclipse(TM)based development > software that enables intelligent coding and step-through debugging. > Download the free 60 day trial. http://p.sf.net/sfu/www-adobe-com > _______________________________________________ > Emc-users mailing list > Emc-users@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/emc-users > > ------------------------------------------------------------------------------ Apps built with the Adobe(R) Flex(R) framework and Flex Builder(TM) are powering Web 2.0 with engaging, cross-platform capabilities. Quickly and easily build your RIAs with Flex Builder, the Eclipse(TM)based development software that enables intelligent coding and step-through debugging. Download the free 60 day trial. http://p.sf.net/sfu/www-adobe-com _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
