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In article PiPld.610968$8_6.562540@attbi_s04,
"Marc J. Zeitlin" wrote: Wayne Paul wrote: ..... For example, a Schreder HP-14's 40:1 glide ratio is decreased to 2:1 when the flaps are lowered to 90 degrees. Wow! That's an amazing change. ...This gives an approach angle of 30 degrees which requires the nose to be 45 degrees below the horizon. I think you've got this a little backwards - if the approach angle is 30 degrees, the nose can't be BELOW that - you'd have a negative angle of attack. I think that the nose would be somewhere in the 20 degree down range, to provide a positive AOA of somewhere around 10 degrees. 20 degrees nose down is VERY down, however - it would certainly LOOK like you're pointing straight down..... You're forgetting the effect of lowering the flaps on the actual as opposed to nominal AOA of the wings. Ask yourself how much you'd have to lower the nose after lowering the flaps in order to (for instance) stay at the zero lift AOA relative to the fuselage... -- Alan Baker Vancouver, British Columbia "If you raise the ceiling 4 feet, move the fireplace from that wall to that wall, you'll still only get the full stereophonic effect if you sit in the bottom of that cupboard." |
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