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  1. M

    Interesting new engine design to replace 2 strokes

    I came across this new aircraft engine that looks interesting. I know just enough about engines to find it interesting, but not enough to know if the claims are valid. Simplicity Motor Works
  2. M

    Ligeti Stratos

    I was talking about the Stratos regarding the crash. I had a website for the boxwing that was very informative but I seem to have lost it now so I'm working from memory, but you are correct regarding the less than perfect results of modification. Basically the original boxwing should have...
  3. M

    Ligeti Stratos

    If you're interested in this design you should see also the Sunny Boxwing. I was under the impression the desin was quite viable and tested well. It was modifications that caused the the crash - if I remember something to do with flap settings on the rear wing?
  4. M

    A footlaunched plank design that worked

    Thanks Yogi, Care to share any experiences with the B10? I've often wonder how it landed on elevons alone with limited flare authority and no flaps. I also heard it had spin issues if the CG was too far aft and that the elevons were best used for pitch with the tip rudders for roll due to...
  5. M

    Finally a working "jet" pack

    Seems the nay sayers might be wrong on this one. The recent Popular Mechanics had the jet pack listed as a done deal due for commercial release almost immediately. Seems the FAA and other have already posted speed restrictions.
  6. M

    Footlaunched sailplanes Archaeopteryx and canard 2fl

    I found the other video thanks. It has 2 clips of the 2FL crashing. In one it looks like adverse yaw causes a yaw dive. In both it sure breaks up into a pile of shrapnel fast. The reported noted weight - 105lbs was when made of glass and foam. The plan for kevlar and foam was expected to...
  7. M

    A footlaunched plank design that worked

    Yeah the fact that the rigid wing tails are dampeners not stabilizers is often overlooked. But even at a neutral angle of attack (for a given trim speed and mainwing AofA) there probably is some contribution to induced and parasitic drag and some contribution to stability when the AofA deviates...
  8. M

    Footlaunched sailplanes Archaeopteryx and canard 2fl

    Incidentally - how do you find that associated video. I can't find anything on the website?
  9. M

    Footlaunched sailplanes Archaeopteryx and canard 2fl

    Interesting comments. I think the idea will the 2 fl was not to launch and sled ride to the bottom - then go up for another flight - you can use a paraglider for that far more easily . The LD was actually 31:1 (I finally found the data in my flies) - 3 points better than the Archaeopteryx. My...
  10. M

    Footlaunched sailplanes Archaeopteryx and canard 2fl

    I came across this video on the net. It shows the newly Archaeopteryx with traditional tail but at the end of the video has the only videos of the much older canard 2fl of Hans U Farner. The 2fl was decades earlier than the Archae and reported 2 points better glide at 30:1. The weights were...
  11. M

    Finally a working "jet" pack

    I know the German rocket planes used a hypergolic - Cstoff and Tstoff - or something like that. One was a very corrosive peroxide mix that could dissolve human tissue. With the helicopter the peroxide mix is probably still nasty - just distilling the stuff to 90% purity has real issues. But...
  12. M

    Finally a working "jet" pack

    I've always been surprised at the scam adds that a respectable magazines like popular science - and mechanics allow - and must take some responsibility for. Surely they can get more respectable sponsors? I love the ones for specially minted coins, synthetic diamonds or Cleopatra jewels...
  13. M

    Nature has it right...the wise old owl

    That's an interesting sentiment I see repeated quite frequently. And when you consider the Goldilocks list of requirement for life here it's an easy conclusion to reach. Not too close or too far from the sun, a moon just perfect to stabilize orbit, a spinning metal core to create the right...
  14. M

    Finally a working "jet" pack

    Yeah I expect the "may" might be something of a euphemism. But you've gotta respect the guy's tenacity - he's been working on the concept for decades - and I tend to give points to a guy who's willing to go to such lengths with such a radical new idea. If he's a con man now I suspect he...
  15. M

    Finally a working "jet" pack

    I also tend to be skeptical - and mentioned the Moller sky car earlier - if I got the spelling wrong. But to play the Devils advocate here. These guys: 1. Have a definite commercial release date quite soon. 2. Have addressed the training issues with a specific training program they've...
  16. M

    Finally a working "jet" pack

    I also tend to be skeptical - and mentioned the Moller sky car earlier - if I got the spelling wrong. But to play the Devils advocate here. These guys: 1. Have a definite commercial release date quite soon. 2. Have addressed the training issues with a specific training program they've...
  17. M

    Finally a working "jet" pack

    Thanks for the correction. Looks like the Gluhareff is one of the many type of valveless pulsejets - so not technically a pulsejet. I found it referenced under the topic though - there are a great many varieties, it seems the one using the U shaped tube has the widest following.
  18. M

    Finally a working "jet" pack

    Sorry for the typo on the website link. I also think jet is a misnomer - which is why I put it in inverted commas. The biggest problem with these designs I think has been in balancing the thrust. Though I'm not sure it's such an issue with these 2 duct, low CG designs, this is apparently...
  19. M

    Finally a working "jet" pack

    I did a bit more reading on the site and they seem to have it well covered. They talk about an inbuilt crash cage that takes the impact from 30 foot falls and expect the ballistic chute to work above that claiming there' s no danger zone like there is in helicopter - too low to auto rotate...
  20. M

    A footlaunched plank design that worked

    There was a website where you could eyeball the foil section, then look up the coordinates and polars and I found the section there. My bookmark link no longer works and I wish I had saved the coordinates. I'll keep looking - and I think maybe these were the foils Norm referred to. Yes I...
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