SCAT Electronic News 7 May 2001 issue 576
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- Category: Archive 2001
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SCAT Electronic News 7 May 2001 issue 576
Table of Contents
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April Tann II
Lost Hills Covered Hole - The Luddites
To Dick Ivers - Brush
aero modeller - Norton
Alien POWER! - Hines
folding flapping and floping - Skyk[i/e]ng
April Tan II
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Please be advised that we have had to cut almost everyone's rubber order
for the April batch. We regret that we had promised too much to too many
customers, and we are trying our very best to as fair as possible. Many
recent orders have been turned down with regret.
The next ( larger ) batch (of all sizes) is do to be received in mid
June. We are telling everyone that we are making a new back order list
for this batch, but to be on it we need to receive an order and a check
for USA orders. Back orders from the April Tan II will be automatically
put on the new June list We will not cash checks until the order is
shipped.
Overseas customers may just request to be put on the list, but will need
to send payment prior to our shipment. We hope that this will be fair to
all and we do not intend to reduce orders next time ( until the June
rubber is all shipped). We also hope that this approach will ease our
paper work
Sally and I thank you for your patience and understanding.
Lost Hills Covered Hole
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Bob White hastens to mention that the hole west of the Lost Hills launch
area, which was recently filled in nicely, thanks to the Gypsum Company, now
has a nice stand of tumbleweeds sprouting. Beware.
Bill Bogart, Luddite Interpreter.
To Dick Ivers
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The Dick Ivers interest in A1/F1H prompted me to announce that I have
been importing the Glide Star that sells new for $166. I have about a
dozen out there that are flying very competively.
It is a beautifully built model.
Al Brush/Star*Link
Online catalog: www.inland.net/~abrush
Fly Free Flight For Fantastic Fun!
aero modeller
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Yesterday, I received a letter from the American agent for Aero
Modeller ( Wise Owl Publications ) informing me that Aero Modeller wil
be reborn, joining Aviation Modeller International as a magazine within
a magazine. Further, subscription holders will receive three extra
issues to make up for the three months that Aero Modeller has been
deceased. And the further good news is that Alec Gee will be the
Associate Editor, with Ron Moulton as Editorial Consultant.
Will wonders never cease?
bob norton
Alien POWER!
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Hi Bob,
I don't what strange forces you possess, but it must be POWERFUL
to coerce the town fathers to change the town name to ALIENTOWN,
from Allentown, PA.
As I read my April 2001 issue of the NFFS DIGEST, there it was, in
black and white(are aliens colorblind? Just curious) on page 5,
"Bob Gutai, Alientown PA".
I sure don't ever want you mad at me or you might turn me into a newt
or something.
So I had better take this opportunity to congratulate you for winning
the McNeill F1J Cup in 2000.
Does this keep me in your good graces, hopefully?
YOUR VERY GOOD FRIEND,
LEE HINES
folding flapping and floping
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>
> Thanks Bill for bringing to the fore the elegant solution for the climb.
Anytime, Bill.
>
> Symmetrical airfoil, indeed would eliminate the wing twist due to
high speed.
> I haven't used one since I found out that cambered airfoils work better.
What a coincidence, as I also discovered that very same thing early
on.
> What I think would better suit the situation is to have a symmetrical airfoil
> during climb and a cambered section during the glide phase.
Yes, that sounds like plausible idea. Now that you mention it, I wrote
an article on flapper philosopy for Bill Hartil when he edited SCAT's
pre-electron newsletter. Some started calling me the "Father of the
Flapper." Actually I was more like the second cousin twice removed.
> Gil Morris is well into that combo using, I might say, a Bo560-26 modified >
>section.
>Bill Bogart
Yes, I know Gil. He does real good. Why is he now using a Wakefield
section? Couldn't get the kinks out of a Nordic's? They do glide even
better
> [ I think that Skykeing gets his symmetrical airfoil by folding the wing
> and putting two undercambered surfaces back to back ?]
Roger, is that a trick question? It never once occurred to me to put
two under cambered sections together back to back. Talk about a drag
brake! No, they do much better belly to belly,
Once (properly) folded up the wing has a lot more going for it than
just the symmetrical section with its obvious desirable aerodynamic
features, such as avoiding the fearsome pitching moment of a
asymmetrically cambered section along with the fact that the angle for
zero lift is coincident with the section's lowest drag ... a feature
not enjoyed by current F1Cs, except for Leonid Fuseeve's folders and
selected flappers.
An extra big plus is the mechanical and aerodynamic advantages of
cutting the span over half in the climb. (the wings have six panels)
For instance, a new design has a 25-1 aspect ratio with a thickness of
.3". the airfoil is 6% thick with a camber factor of around seven. Try
holding THAT together somehow dragged along by brute force at 100 fps!
Folding the wing gives a different perspective. The wing span is only
50" (halving the wetted area) The thickness is around 20 percent. All
buttoned up that is a pretty stiff unit and it ain't gonna move --
until it is supposed to, that is. Because of these advantages the
construction does not have to particularly rigid.
There is only badness -- with no redeeming features whatsoever --
using high aspect ratio wings in the climb ---and that goes doubly so
with flappers with their compromised structure and drag problems with
bumps and awkward curves.
Being the godson of the Godfather of folders I am embarrassed that it
is taking so long to get this approach ironed out and fool proofed
...Well that might be the problem i.e., fool proofed. The fruit
doesn't fall far from the tree!
I might mention that the above Gil Morris was witness to a flight of
an early folder before he had built his first flapper. Where does the
time go?
It will get done. I should make a resolution to that effect.
Incidently, Roger, it is Skykieng not Skykeing -- despite the obvious
phonetic disparity.
My apologies to my hero, and unknowing mentor, Bill Bogart for
tweaking his rudder a bit.
Bill Gieskieng, aka Skywhatever
p.s. I did consider combing flappes with folders to get a thinner
profile. But computer studies at Martin Hepperle's web site showed
only ambiguous, if not downright disadvantage accompanied by a lot
more effort and added complexity. The wings (AMA type) that I already
started simply had the flaps glued in place. The more I think of flaps
the less I think of them dramatically besting the current State of the
Art. Gil has pushed it about as far as it can go, and he doesn't have
oodles of edge. But that is just a guess. If there was someway to do a
true variable airfoil -- as once invisioned and patented by Parker in
the early part of the last century -- Yes. But that is not going to
happen.
FINIS
................
Roger Morrell
