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  1. L

    Duramold/Weldwood/Haskelite !

    It looks like you have biax +/-45 degree carbon on the left spar.Why?
  2. L

    Stallion

    MGS 285/287 is really expensive in the US. Havel-composites in the Czech republic sells it for about one third of the ACS price.Hardener 287 is no longer available for non-industrial use in Germany,as it is labeled as toxic.
  3. L

    "Surfboard" wings with carbon rod spars?

    Some rotor blades have solid honeycomb core,especially in the rear part of the airfoil,but honeycomb is very expensive and difficult to machine to precise shapes
  4. L

    "Surfboard" wings with carbon rod spars?

    Re: lightweight wingskins according to this pdf, the Extra 300sc, the competition single seater, has a wingskin, ahead of the main spar, made of 1 outer layer of 6 oz(200gsm) carbon or carbon-aluminum, 10 mm 3lb honeycomb, and one inner layer of 6 oz carbon. There is an additional inner...
  5. L

    Tube size

    Looks like aero-parts.eu has the proper sizes available at still reasonable prices.
  6. L

    Tube size

    The prices on chassisparts.fr for 25cd4s are less than half of what we pay for 4130 in the US. Too bad they don't list the more common 1mm wall sizes like 16 x 1 or 20 x 1. I wonder if you could buy directly from Benteler in Germany,a lot of the ACS tube came/comes from them.
  7. L

    CAD Model of human body

    Nothing beats an actual mock-up to get a refined feel for things though
  8. L

    New wing

    Is the 4130 tubing affordable and available with .7mm to .8mm wall thicknessin India?
  9. L

    Any way to make those so called aerobatic planes any safer ?

    the MX airfoil is slightly convex in the flattish part
  10. L

    Stephens Akro plans

    I think a lot of people would pay 40 bucks for high quality pictures of the plans, but if you really wanna build one you should probably get the York plans. I would also love to have a history of modifications done to the Haigh Superstar and Leo's Laser.
  11. L

    Parts For Sale Divinycell Sheet 320 SF total $100 per sheet certified

    What's the thickness?
  12. L

    Spar inspection results raise FAA concern

    I would machine these out of 7050 T7451 which is very uniform in strength in thick sections,increase the thickness of the flanges in the center by about .125 inch, and do a static test to failure using an old airframe.This should meet the original certification requirements. Right now the lower...
  13. L

    DarkAero

    I don't like the ailerons being driven by those very long and slender torque tubes. Other aspects of the control system don't impress me either.
  14. L

    Suitable steel for all brackets etc.

    How expensive is 1.7734.4 sheet right now? It is one of the best steels for tig welding.The Extra aerobatic planes use it in all their fuselages.It's about 15% stronger than 4130. Certainly you won't be using that much of it,even though it is expensive.
  15. L

    Dynamic Soaring Blows My Mind

    No, upwind for sure,at least relative to the prevailing wind. The wind speed underneath the shear layer tends to be modest,and depending on conditions is mostl opposite to the prevailing wind close to the ground.
  16. L

    Snoshoo IF-1 Racer Construction / Technology

    There is evidence of the weight of water ballast in glider wings deforming lower wing surfaces,causing premature transition. Building a wooden or any wing with a smooth contour without accounting for surface pressures is foolish. The question for a serious non prepreg wing is how do I get the...
  17. L

    Any idea from where to get 4130 in Europe?

    A lot of the tubing that ACS sells is made in Germany by Benteler. Meracing.com in Sweden sells 4130. Regarding 15CDV6,or 1.7734.4 in Germany,I think it sells for above 50 Euros/meter.It is used on all the Extra planes.
  18. L

    Composites vs aluminum

    Some of the most lightweight applications of hand layup carbon can be seen with RC handlaunch gliders. https://www.rcgroups.com/forums/showthread.php?2832791-Introducing-the-Vortex-3 These gliders weigh under 8 ounces RTF with a wingspan of 59 inches.The wings/tails are solid core Rohacell 31...
  19. L

    inexpensive but good alternatives to graphlite carbon pultrusions?

    Has anyone had a chance to try the Toray pultrusions: https://www.toray-cfe.com/en/composites/products/pultruded-profiles/121-plates.html The strength and modulus values are even better than the graphlite, and going by the prices shown at Suter Kunststoffe,they are reasonable competitive...
  20. L

    Composite landing gear for Pitts S1SS

    A gear of the same shape and size of the aluminum one would weigh about 46 percent less if made out of carbon,mostly tow. I saw a picture of a carbon zivko gear somewhere.The Extra 260 had a glass tow gear,but it was quite a bit thicker than an aluminum one. All the Extra 300 gears are glass...
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