Recent content by John Newton

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  1. John Newton

    Witold Kasper

    Hi again, I haven't posted in ages (v.busy) I was reading an article on the Short Sherpa fling wing glider (later converted to a jet) and noticed that this two had severe problems when being towed into the air by another aircraft, as per the SB-13 and the Bekas, seems to be a common problem with...
  2. John Newton

    Witold Kasper

    The origional link isn't working, but I have rotated the scanned file to make it a bit easier to read! Merry Christmas all! John
  3. John Newton

    Witold Kasper

    Hi all, sorry I haven't posted in ages, just came across this report in some papers I was sorting through, thought it may be of interest in relation to the BEKAS crash? (see highlighted paragraph) John
  4. John Newton

    How to choose the tapered ratio for AR=4 horizontal tail?

    Forgot to mention XFLR5 will give you a plot of lift distribution across a wing so you can see how close to elliptical it is.
  5. John Newton

    How to choose the tapered ratio for AR=4 horizontal tail?

    A taper ratio of 0.5 will approximate an elliptical lift distribution pretty well for that AR I would think provided you have no washout/washin, at that Re I would have thought you would not see a tip first stall at a taper of 0.5 or greater as this rule of thumb applies to model aircraft with...
  6. John Newton

    How to choose the tapered ratio for AR=4 horizontal tail?

    As for sweepback, this "pushes" the air outboard loading the tips more and increasing the lift distribution at the tips, therefore it can cause the tips to stall sooner, similarly sweeping the wing forward will reduce the chances of tip stall, a word of caution, swept forwards wings need to be...
  7. John Newton

    How to choose the tapered ratio for AR=4 horizontal tail?

    Hi Anna, As a general rule of thumb, if a surface has no twist (i.e. no washin or washout) a taper ratio of 0.5 or higher will help ensure that the root stalls before the tip to avoid tip stalling, Reducing your taper ratio from 1 to something like 0.6 whilst keeping an AR of 4 may make the...
  8. John Newton

    Bell Shaped Lift Distribution - best compromise to achive it.

    All, finally got some decent quality video of my BSLD wing in flight, it is viewable here: BSLD test flight 15-06-2014 - YouTube Let me know what you think and thanks again for everyone's help. Thanks, John Newton
  9. John Newton

    Karl Nickel's Falter 1 tailless aircraft

    Intriguing, I haven't come across this before, anyone able to translate the German? I am guessing that the adjacent inboard and outboard portions open in opposite directions (diferentially) to give rudder/yaw control ?
  10. John Newton

    Bell Shaped Lift Distribution - best compromise to achive it.

    Hi all, good to see the discussions regarding the Hortens and BKB are still going strong, just thought I would post a link to a (very brief) test flight of my latest wing, in case any of you are interested. Will keep you all posted on further progress. Test glide 2 - YouTube John
  11. John Newton

    Wing molds out of blue styrofoam?

    Hi, Below is an article I submitted for another group I am a member of but though it may be of some interest to readers of this thread, I have just finished a 1.3m span flying wing constructed in this way and the finish and weight are both good, wing was hot wired using laser cut templates but I...
  12. John Newton

    Witold Kasper

    Wishing everyone on this forum a happy new year! John
  13. John Newton

    Bell Shaped Lift Distribution - best compromise to achive it.

    Topspeed, it all depends on what airfoil sections are used along the span and what twist etc., an elliptical wing with no change in airfoil and twist should give an approximately elliptical lift dist and a swetp wing will tend to push the lift dist towards the tip if no twist is used. John
  14. John Newton

    Bell Shaped Lift Distribution - best compromise to achive it.

    Thanks for the Video link Norman, I'll take a look when I get home, must keep moving with my R/C wings, finished getting the overall wing shape sorted for my Sin^2.5 BSLD wing, now just need to build it :-). Bruce, I may be wrong but I am not sure that there does have to be negative lift near...
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