Not sure what
the problem was with the New Forum post flagged below, I thought the
scaling topic was going well; maybe the flag refers to Pierre's
impression that I was "confusing" scaling effects he found "clear".
Reposting the flagged post here, and leaving the New Forum aside for
now, until immoderate Moderation moderates.
[Tallak had
questioned how much nominal cruise speed data correlates with stall
speed]
Obviously
stall speed strongly correlates to cruise speed; I merely grabbed the
first scaling graph in search to show what sort of scaling data all the
fast AWES kiteplane ventures have been “clueless” about.
An
equivalently loaded (powered-up) kite the size of a 747 does recruit
the mass of the actual 747 via the anchor. 75msec is Cat5 hurricane
velocity, many times beyond probable wind. In this power class, a soft
kite’s lower stall speed is highly favored, not to mention its
crashworthiness.
Tether
scaling also is function of the kite window. German weather kites of
<10m WS reached ~10km high a century ago (~1kite/km), and Peter Lynn
worked on similar-sized yacht kites to go downwind in the open ocean at
high altitude (>500m), but KiteShip developed far larger kites for
12m Cup yacht racing only flying low (~100m). Kite sports have
similarly large ranges of Tether Factor highly independent of WS, from
Kite-Fishing to ParaGliding.
Pierre
is right about AWES scaling being a confusing subject, but that’s not
my fault here in presenting it as clearly as an introductory AE lecture.
New Forum Original
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Scaling by size
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Scaling
by size
Tallak,
In aerospace we use the case-base range of velocities and masses from
scale-model to jumbo-jet for mini...
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