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  1. S

    Pressurization=> structural big window?

    this material might be a good option ... nucleer
  2. S

    Corsair/Spitfire hybrid

    Not a power aircraft, but an example of a crash resistant cell in a glider that might give you some idea's, would be Lange Aviation which uses this approach.
  3. S

    Tandem Wing Pusher

    with a few corrections for the more obvious things that xflr5 does wrong....the flat plate drag should be around 0.932, so not as good as the AR5 The wing sections/fuselage shapes I get by digitally removing them from the airframes, generally accurate enough that they don't require too much...
  4. S

    Tandem Wing Pusher

    As for Drag, if the Diana 2 has a 50:1 L/D, for its 500 kg weight, thats 4903 N / 50 = 98N of drag more or less......quite a lot less than the 278N I have calculated for the tandem wing. As for power, yes some larger 850kg gliders (1 & 2 seat) have 56 hp engines (41Kw), but they are self...
  5. S

    Tandem Wing Pusher

    Forgot a couple of things, glider sections are not useful here as they generate too much lift/drag to allow any sort of a good cruise speed, the sections I used were my own and very low camber (0.7% to 1.1%), the cruise CL's are also low. The fuselage is similar to an ASG-29, but the nose is a...
  6. S

    Tandem Wing Pusher

    When this thread began I started on a single seat version in XFLR5 just to see what was possible....just found the time to finish it. The following is just my opinions and hasn't necessarily followed the direction the thread has headed in. First up, XFLR5 is getting more accurate and can produce...
  7. S

    Tandem Wing Pusher

    something like this ?
  8. S

    Hi Wing Airfoil Selection

    Just for my 2 pennies worth, I typically like the CL as low as possible at zero alpha and as high as possible at some reasonable and flyable alpha (6-7 degrees), beyond that, unless the velocity vector is negative most results above that are not really usable/flyable. The section results shown...
  9. S

    Exhaust Extraction on a Pusher

    think I'm going to revisit this subject after reading the thread "Beyond Streamlining: Drag reduction in the 21st century" by John McGinnis on oshkosh365.org. The relevant part is on page 3 and copied below. Acually....reading the whole thread would be useful for most everyone. This one has...
  10. S

    Exhaust Extraction on a Pusher

    The original idea was 3 layers...lower layer or against the prop shaft was for a small portion of the engine bay air, next up was a can with an internal shaft coupled impellor and ceramic seals, 3rd was an external impellor (also shaft coupled) to drag off the majority of the engine bay airflow...
  11. S

    Exhaust Extraction on a Pusher

    The goal was both noise and drag reduction, although the later probably isn't achievable as the current exhaust location is slightly aft of the turbulent transition location anyways. At this point I think I'll just shelve it as it seems like a lot of aggravation for little gain...thanks for all...
  12. S

    Exhaust Extraction on a Pusher

    Playing around with a small 2 seater and one of the people involved wants the exhaust routed out through the spinner. (see pics for current arrangement). Somewhere in the dark recesses of my brain I seem to remember that this has been tried and failed, and have searched here, but failed to find...
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