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Showing content with the highest reputation on 08/31/08 in all areas

  1. 2 points
  2. Sorry for the blur on this one...new camera, I figured it out not too long after this. M61 for that F-14 (still active duty) B-61 Gravity Thermonuclear Devices RED INTERIOR **HINT HINT** One of very few parasitic aircraft XF-84 The actual X-Wing from Star Wars
    1 point
  3. A cake is basically made of sweet bread with frosting on it. A pie has fruit filling inside of a crust...or with pudding. Cheesecake can be considered a pie. Dont ask.
    1 point
  4. I don't know who has written that in dynamicflight.com but it's all wrong, big time, both the picture and the quoted text. Obviously written by someone who has no clue about helicopter rotorblade azimuthal flapping. Lets assume the flight controls (at least cyclic) are in neutral. In hover all blades have the same angle of attack and flapping, that's clear. In case of a forward flight (or any other direction of the velocity vector) and counter clockwise rotor rotation (like in that picture) the advancing blade at 3 o'clock will have the biggest average velocity hence biggest list (depending on V^2) and biggest flap up which decreases the blade AOA. It's called selfcompensation or blade flapping self-damping. Because of the blades inertia (like any other body) the maximum angle of flap is indeed not at 3 o'clock (biggest lift) but phased forward up to 30-45 degrees. That 90' (azimuth 0-180) on that picture is a joke. Similar is what happens on the left side with the retreating blades. At 9 o'clock the blade will have the smallest airflow velocity which will decrease the lift and force the blade to flap down thus increasing it's AOA, hence the retreating blade stall nature. Again, thanks to blades' inertia the lowest point the blade reaches is not at 9 but about 8 o'clock. As a result, in that case the rotor cone in forward flight will be tilted to the left and a bit backward. And that's why ALL helicopters around the world have their rotor (gearbox) axis tilted forward- when in cruise airspeed the rotor lift should not have rear component. As for coaxial counter rotating rotor the picture is all the same for any of the two rotors separately. Two lower rotates counterclockwise (seen from above), the upper clockwise. In forward flight the lower rotor cone tilts to left and back, the upper to the right and back. This makes the gap between the two rotors to decrease at the right side, between 2 and 4 o'clock (helicopter nose is 12).
    1 point
  5. I agree. I agree. I agree. The main gear get caught in the safety net, the pilot pulls pitch to get away from the ship. The main gear are caught on the safety net, but nothing is holding down the front of the aircraft, so the front of the aircraft continues to rise while the rear of the aircraft cannot. The pilot continues to pull power and the problem worsens until the aircraft almost flips over backwards. Helicopters hover just fine out of ground effect. Ospreys take off from carriers routinely with one rotor disk out over the edge of the ship. Ground effect had no impact on this incident. Chinooks and Sea Knights do pinnacle landings routinely where one disk is in ground effect and the other is not. Single rotor helicopters routinely perform maneuvers where only half of the rotor disk is in ground effect.
    1 point
  6. Nah, pretty sure it flaps up on 9 o'clock. I have it in my book but here is a quick online reference. This happens because there is a 90 degree phase angle between aero forces and flapping as explained in the bold comment below. http://www.dynamicflight.com/aerodynamics/flapping/ :)
    1 point
  7. heres tekas link . cheers . no need to install the language pak . its english anyways . http://bvr.jpn.org/lockon/index_e.html
    1 point
  8. Thx for the info :thumbup::thumbup. Although, if I ever met her IRL, what she'd get from me would neither start with "I" or end in "Q" ;) .
    1 point
  9. OH GOD you got me..... THANK TO ALL mates, nice to read all wishes. But I am still like 18 years old :music_whistling: I feeling it like teen :D And also I have to satisfy all girls during friday party :D:D: about it :) basscadet's - for sure, I hope during my 60 I will put my teeth near my joy and will start lockon v8.50 :lol:
    1 point
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