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  1. J

    NASA Crashes a Small plane, On purpose.

    What's that old saying, "The probability of survival is inversely proportional to the angle of arrival "I think if you've got one plane to test with, you pick the worst case scenario where survivability is questionable. Flatter trajectory impacts are more survivable vs steeper stall recovery...
  2. J

    Why do amphibians nose dive on occassions ?? whats the major cause ??

    Tunnels, the single engine Cessna's that I flew on floats pretty much all were on step between 40-60 mph. Rotation usually happened around 80 (all dependent on weight). If you didn't have the step, you'd never reach 80 so you'd never fly. It was my experience on several occasions where we had to...
  3. J

    Why do amphibians nose dive on occassions ?? whats the major cause ??

    As a pilot who's flown float a/c I can echo others comments in regards to the various platforms. It needs to be differentiated if the OPer's comments are directed to Flying Boats, or float a/c w/ Amphibious gear. I can tell you if you have a float plane [say Cessna 185] on amphibious gear and...
  4. J

    Best CAD program for aeronautical drafting?

    Rick how do you like Geometry Works? Is it simple to learn? I've done conic's using solidworks on it's own... not an easy thing but doable.. what can Geometry works do on top of the standard level of functionality of solidworks?
  5. J

    What type of Aircraft is that???

    Lol... it is possible it's a mix of a couple different designs too.. someone likes 'this' off one plane and 'that' off another and was gonna make their own 'perfect' looking biplane. It does look like it's on the ultralight end of the weight spectrum.
  6. J

    What type of Aircraft is that???

    litespeed you could be totally correct.. I just saw the pic's and referenced the tail shape.. closest thing I could think of was the Renegade.. I'm sure there are more than a few obscure and lost creations that have this same general look and shape.. some maybe even still that were not named...
  7. J

    What type of Aircraft is that???

    My guess would be a Murphy Renegade spirit.
  8. J

    A rather interesting Russian design

    Also interesting is the single eye bolt that is holding the spar on at the top fuse/spar connection. I wonder how much load is allowed in an eyebolt in compression? I could understand if the spar was inverted to how it is currently, w/ the eye bolt in tension from lift forces. Oh well, he's...
  9. J

    A rather interesting Russian design

    Tom what would be the issue w/ bonded carbon tubes? I think the idea might have some merit but then it would seem I'm missing something? A guy could build a pretty light Facet-Mobile type plane w/ this and flat carbon sheets over it all. Not my preference but interesting non-the-less. JFG
  10. J

    Homemade CNC router?

    Jarno, I you can pretty much take any mold size and it would be nearly a linear comparison in dollars. The big advantage of cnc is simply that you can't duplicate to the accuracy of a cnc by hand, for the cost of getting it done [or the time]. There would be little point in machining a mold...
  11. J

    Homemade CNC router?

    Just a quick note, I'll reply more in-depth here tomorrow. [I just got back from a 3 day trip.] Rienk, where are you located? I'm interested :) Auto, simple math for you.. A typical mold needs to be cut twice [minimum] First pass @ 0.125" to 0.375" step over [depending on setup etc etc]...
  12. J

    Homemade CNC router?

    Trouble w/ bolting things down to the floor is that the floor rarely stays flat.. I would think an independant frame would be more 'repeatable' accuracy wise vs bolting to a floor or pad. JFG
  13. J

    Homemade CNC router?

    Auto, ok so.. I'm going to do what I said I don't normally do. :) Rather than figure out the surface area on a 360 and how many molds it would take to build, I figured I'd try making a number that works for per sqr ft. So after some figuring and messing around w/ multipliers etc.. I think [and...
  14. J

    Homemade CNC router?

    Auto, I generally haven't quoted based on sqr footage. I've always looked at the job and quoted directly from the job. Every job is different so .. tough to do otherwise w/ realative accuracy. If you've got something that you'd like a price on, feel free to send it over and I'd gladly quote it...
  15. J

    Homemade CNC router?

    Tom, I'd pondered the idea of composites as well [I'm a composite guy, have been for a while and then helping my father build a Lancair 320 just re-enforced it] But I would seriously NOT recommend building a router or mill out of composites for two reasons. #1 Cost/complexity, to get something...
  16. J

    Homemade CNC router?

    Mac, I'm not actually an engineer. I was lucky enough to know a bit about drafting a having a family connection to a shop that needed a draftsman. My actual trade is I'm an ATPL [while I still do fly part time, designing is my full time job]. What I know I've learned on the job and through...
  17. J

    Homemade CNC router?

    Tom, thats the problem.. I still haven't built it! :) I think there is a picture under the into section of the website [I don't have one on me here at work]. As far as complete pictures, the rendering on my website is pretty much the only one, that and the vid's. The machine fills my garage...
  18. J

    Homemade CNC router?

    Mac, no secrets :) The vids show it all. I've been using it for 4 years now, just slowly getting up to speed. The first year I did some improvements and learned what works and what doesn't, while making parts [still learning there]. I work full time as a mechanical designer. I've been doing...
  19. J

    Homemade CNC router?

    I think the belt drive system would work ok for most non-ferous cutting. The problem I see w/ the machine in the video is two fold. I expect he'll have alot of resonance issues due to building out of HSS steel sections and I think he'll wish he had more 'reduction' where he has belts. I've build...
  20. J

    Another day, another new idea

    Orion, curious as to what a run like that costs from AMI? Thanks sir J
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