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  1. S

    Anyone want to see how tough a bird the IL-76 is?

    Here is the video: www.youtube.com/watch?v=yN6mnw7HuGs Check out the wind direction :-)
  2. S

    tedium Part 3: the "stabilator"

    Decided to go "Van's" route, and built the all-moving stabilizer first. AND the extra forty two 3 inch corner blocks that the twelve 1/8 birch ply ribs will require. The latter are now cut out to symmetrical form and only require sanding edges and holes drilled to lighten. Have not planned out...
  3. S

    Tedium...part 2

    Just completed the all the corner blocking for the 2 wings of my future airplane; 230 pieces! Yes; just the wings and ailerons. These were manufactured using a commercially available 'cove' molding (inverse quarter round). Each wing has fifty seven 5" pieces for the main spar; thirty 4.3" pieces...
  4. S

    talk about tedium!

    I recently wanted to produce some small parts to the required dimensions, so that they would be ready to install once the large portions of the aircraft were ready for assembly. Some of the first (107 total per wing panel) would be the corner blocking. My wing modification included an increase...
  5. S

    reverse lift curve ?

    Hi guys...just thought I'd sneak a report number I had forgotten, in here: TR586. It was the first NACA analysis of low R behavior of common airfoils and has an interesting result sidelight in that some very thick highly cambered airfoils will actually INCREASE their Cl with decreasing Rn. Not...
  6. S

    engines(multi)on pylons or LE?

    I was going to mount engines(5hp/5#)in conventional fashion until looking at modifying a Souricette and wondering where the replacement engines would go. I thought 45degree sloped streamline tube pylons might be used to put the props out ahead of my tender body :P and then, a aero-question came...
  7. S

    candidate for magic airfoil section?

    I know the title is 'corny' but after cruising through those hundreds of sections graciously provided by "krauss", I couldn't help wondering why the 18.3% thick Gottingen 679 showed such a superior L/D ratio (64.8) when that number is usually reserved for thinner airfoils. The plotted polars add...
  8. S

    lift curve slope analysis

    Looking through the airfoil performance tables of a previously mentioned textbook, I noticed a specification of dCl/da (change of Cl divided by change of angle of attack). In the spectrum of ultralight design, is it preferable to have a higher value (steeper, faster rise of curve=lower stall...
  9. S

    airfoils at low scale R

    Not sure if it has been posted; NACA TN1945 available from their technical reports server, has info on 15 different laminar and turbulent sections at R=700,000 and up. It was published as a guide for G/A manufacturers in 1949 and seems to have been completely forgotten in subsequent articles on...
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