SEN-452 August 11 2000- Royal Birthday
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News and Reports 2000 - second half
SCAT Electronic News 11 August 2000 issue 452 - Royal Birthday
Table of Contents
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Happy Birthday - Brokenspar
Timer shortage - Markos
ritz foil - Joyner
MicaFilm Comments - Thorkildsen
Cybering in the sunflowers - Parker
Happy Birthday
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Peter King celebrates his 60th birthday, August 11, 2000 !
The worlds of Contemporary Jazz, Model Aviation ( International class ),
and who knows what else
this interesting man dips into, send him enthusiastic greetings !
This news comes from his enclave in Kansas City...
Brokenspar
Timer shortage
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Roger,
Your editorial comment regarding the activities of the TSC in properly
addressing the expected shortage of timers for F1B at the Finals was not
constructive. We would welcome suggestions from the participants on how
best to solve the problem. If there are some, they will be considered at
our bi-annual TSC meeting scheduled for after the Finals. For your
information, we did appropriate extra funds for paid timers and it showed up
as an increase in the Finals entry fees. We thought this was a better
solution than trying to limit the number of participants through the
selection process. One "solution" that was rejected was to have each event
time itself, similarly to the way the MaxMen 14-rounder or the Livotto
contests are run. Maybe its time to reconsider such an approach for the
2003 TS Finals. As far as the your experience at the last Finals, mine as
a timer, was quite different. At several stations throughout my timing day
there were no flyers to time as I waited the entire time window for the
round!
Chuck
ritz foil
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Roger: The recent mention of the Ritz stab airfoil prompted a search
through my dusty archives of magazine clippings to find the article from
Ritz's excellent airfoil series in Model Airplane News. Here is what he had
to say:
"On a Wakefield model where you use a double function airfoil (power and
glide) the selection of a good stab section is more difficult than in a
glider. As the rules have cut down on the amount of rubber power available,
we have gone more and more to undercambered sections and smaller stabs to
try to glean the utmost efficiency out of the model. This, of course,
weakens the 'windy-weather' stability and consistency, and to combat this I
have developed a section, Ritz 6-60-9b, tohelp avoid the model's
'mushing-out' in turbulent air by keeping the model's nose low and in good
penetration. When this airfoil passes through the air at normal low angles,
the air flow pattern is pretty well set by the time the air has flowed one
third of the way over the section, and the rear undercamber has very little
effect. However, at increased angles of attack, this undercamber becomes a
'pressure trap' with a strong push under the stab to keep the model in
correct position."
"I have flown Wakefields with 6% undercamber wing sections in very rough
weather, and gotten beautifully smooth control using this stab section."
MAN, Nov 1960
His article was enough to prompt me to use the Ritz 6-60-9b on several
Wakes back in the early 1960s, including the one shown in the last Zaic
Yearbook. I don't remember too much about the flying ability, but I do
recall that they were a bear to cover. Tissue had a tendency to balloon out
due to the steep curve of the undecambered portion. (I was using a
full-depth spar with angled ribs aft of the spar.) The full-depth spar may
have acted as a turbulator on the bottom. My built-up stabs never did seem
as smooth as they should be, so I did try one all- sheet stab with the Ritz
foil. Definitly not a 4 gram stab!
I also used a somewhat similar stab on a couple of A-1s back then. If
memory serves it was the Meder section from the German all-balsa Nordic
winner "Miss Molly" in 1960 or thereabouts. It was a curved plate with the
high point very far back. (It always looked like it was mounted on the
model backwards.) I belive that airfoil is shown in either the last or
next-to-last Zaic Yearbook.
While I think the more modern stab airfoils such as the Woeberking are a
much better approach for a VIT model, the Ritz foil might have some
application for locked-up models. Is anybody still using it?
Louis
MicaFilm Comments
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With regards to Martin's comment on the Micafilm not being fuel proof I have
not experienced that on the film, but only on some of the dyes they use if
you have a pin hole. The older micafilm with the transparent colors seem to
all work well with regards to fuel except for the orange which would bleed
even with hot stuff, and you could tell where your pin holes were based on
the discoloration of the dye around them after a few flights. I like the
older micafilm since it looked a lot like the aniline dyes we used as kids
in the fifties and sixties.
The newer micafilms are more of an opaque color and I have only used the red
but am using it on a Fox .35 powered Stunt model with probably over 300
flights on it of over 6 minutes for each flight. There is no fuel soaking
into the covering or fuselage which has an epoxy finish on it. I go over
the seams with thin hot stuff to keep them from creeping and to seal them
off while rubbing the seam with wax paper when I first put on the micafilm.
The disadvantage of the micafilm is it does not increase the torsional
rigidity of the structure very much compared to Tissue, silkspan, or silk
but it sure is excellent with regards to puncture or ripping resistance.
Thermals,
Terry Thorkildsen
Cybering in the sunflowers
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Roger,
Our 1st cyber cafe experience. Dallas got 3rd in Jr F1A at the Poitou. Bob P
placed 4th in the F1B flyoff. I lost one of my electronic bunters--forgot
to turn it on, did a great zoom launch. I'm hoping the sunflower search
crews finds it and sends it to Czech.
We're in Paris and off to Czech tommorrow. All is well except Evan is fighting
off a cough that Jon brought to France.
Thermals, Jim and Dallas
.....................
Roger Morrell
