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steve2(at)sover.net
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 Posted: Sun Nov 09, 2008 2:42 pm Post subject: Flight Levels magazine - Fall 2008 issue |
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Dozer fixed...... Whew.
John, seems like there might be more factors at play with the washout? You
could 'tune' a wing for best efficiency to fit anticipated speed, load and
altitude, yes? At speed and low angles of attack, negative a couple degrees
must be close to lift neutral (and less drag).
Forgetting my book learning. Too tired to remember, too lazy to look it up.
All things being equal, is the angle of attack increasing per altitude?
Steve
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Peter Bichier
Joined: 25 Aug 2008
Posts: 103
Location: Toledo, Ohio
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| Posted: Wed Nov 12, 2008 11:04 am Post subject: Re: Flight Levels magazine - Fall 2008 issue |
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OK, just looking at the published performances (Bert Berry's pamphlets, TCFG's):
if (c) is true, how come it works for certain models and not others?
the straight 560 for ex. has a shorter 50' take off (950') and landing (860') capabilities than the 560E Take off (1425') & landing (1500') or even comparing with the 560A (same fuselage lengh) which needs 1240' (Take off) & 1340' (landing)?
so in this case, the 560A with shorter wings has shorter landing than its extended counter part (same applies for take off)
however, the 680E did gain on shorter take off (1525' vs 1540 on the 680) but exactly same landing for both: 1625'
as of the effect on speed: the 680 has a max speed of 230 mph instead of 225 for the 680E, so there it seems the extended wing has a detrimental effect on speed.
[quote="drwer2"]Now,thats interesting.� The effect of increasing the "washout" is to (a). move the center of lift inboard, (b.) decrease overall lift and (c) improve slow speed handling and stall characteristics.�These are subtle changes. �This change would not have a major effect on�MTOW but would place the stress where the wing was stronger.�
�
I'd give anything to see any production drawings.
�
Thanks again Barry for being our Nexus.
�
Willis
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BillLeff1(at)aol.com
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| Posted: Sun Nov 16, 2008 9:06 pm Post subject: Flight Levels magazine - Fall 2008 issue |
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I think the early aircraft had shorter T.O. distance because the Flight Manual called for lifting off as soon as possible retract the gear then accelerate to VMC. They latter changed that to lift off above VMC which adds to the T.O. distance.
Bill Leff
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