SEN-504 November 24 2000
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News and Reports 2000 -
SCAT Electronic News 24 November 2000 issue 504
Table of Contents
=================
Which is worst? - Schlosberg
TMOY 2001 Nominations! = Poti
Dooling Info - Cero
Thin wall kevlar tubes. - Grigsby
SouthWest Regionals - Andresen and Lidberg
Which is worst?
===============
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When accelerating a Nordic on-line, the flier attempts to increase
the model's speed as much as possible, and launch the model
slightly behind him/her. Before the model is accelerated-on-line,
the flier has to bring the model around to a "staging" area. In other
words, the on-line-acceleration [OLA] is confined between a
staging point and a launching point.
The underlaying feature of an OLA pattern is the the rate the
model turns, which is a function of the inner wing's wiggler induced
wash-in, as well as the rudder's deflection under tension. (Stab
tilts might also contribute.)
A straight OLA is useful under optimal calm conditions, while a
circular pattern allows starting the OLA higher up and can be used
to launchthe model at an angle to the wind. The arched launches
sometimes require the flier to run in a smaller circle, helping to
whip up the models speed. Kimmo Kulmakko towing technique
is probably the best example.
This is all fine, but what happens when the model gets off pattern?
Different OLA patters depend on the exact relative-position the
staging point and angle, as well as the flier's speed and running
pattern. For example, suppose the model had not turned enough
before the flier started the OLA. Assuming the model turns right,
then the bad staging point will shift the model's OLA pattern way
to the left, ending up considerably below a full-line height. The
opposite happens when the model turns too much and end up
way to the flier's right.
The flier is blind sided to most of the OLA as he/she are sprinting
forwards. Finding the model suddenly way to the left or right is a
big surprise. At that point not much can be done, as the model is
unlatched. (Electronic launch bail-outs will be ignored.)
The question is which OLA deviation causes more damage (time
loss)? If an insufficient turn on an OLA is worst, then the model
should be trimmed with a bias towards a tighter turning OLA pattern.
If the opposite holds, then a larger-circle OLA bias would be
preferred.
Do other fliers have views or ideas on this matter? As to myself,
a bad OLA is the culprit in most of my sub-max scores.
Aram Schlosberg
TMOY 2001 Nominations!
======================
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REQUEST FOR NOMINATOINS
NFFS 2001 TEN MODELS OF THE YEAR
Fellow Modelers, 16 Nov 2000
Each year the National Free Flight Society (NFFS) honors a group of
noteworthy designs, as a part of the annual Symposium Report. These awards
are known as the NFFS Ten Models of the Year (TMOY). The TMOY process is
simple, and is started when nomination packages are submitted to the Chairman
who reviews them for completeness and suitability. The chairman distributes
the nominations to an appropriate review committee who determine the winners.
The Chairman then sends winning nomination packages to the Symposium Editor
for printing.
Nominations for this honor are accepted from anywhere in the free flight
community and are typically for models of the modern era which exhibit unique
design and outstanding performance as proven in competition. On occasion a
special award is given for a unique component, tool or material which has
greatly contributed to the advancement of an event or free flight as a whole.
Nomination packages for either must include:
1. One-page description of model design and competition record, or unique
contribution for a component, tool or material.
2. Resume of modeler/designer or inventor.
3. One-page three-view with dimensions.
4. Photograph of nominated item, and modeler or inventor.
Additionally all text must be submitted electronically, preferably in
Microsoft Word format, via E-Mail or diskette. Deadline for completed
nominations is a postmark of 12 February 2001. This deadline is determined
by publishing schedules and can not be neglected; therefore, late nominations
will NOT be accepted. Nominators (not the Chairman) are responsible for the
completeness of packages (all 4 Parts). Again, the major emphasis is on
receiving "complete" packages by the deadline to ensure a smooth running
process. Please send nominations to the address below.
Thank you for your nominations! Thermals!
Norman Poti
Chairman NFFS TMOY
5695 Marshall Rd.
Dayton, Ohio 45429-6022
USA
Phone: (937) 439-4831
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Dooling Info
============
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I have a friend who is interested in selling his new Dooling .61 engine.
Where can one get an idea on it's value.
Thank You
AMA68317
John Cero
Where is Martin Simons?
=======================
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Dear Roger,
I'm trying to contact Martin Simons, author of Model
Aircraft Aerodynamics. Any help readers could give me
would be appreciated. A sentimental souvenir grab bag of
wreckage from latest crash is offered as reward for
quickest response. Pieces autographed of course.
Thanks, etc. Bill Gieskieng
Thin wall kevlar tubes.
=======================
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Our local R/C club is doing a public service job for the new Santa Barbara
Maritime Museum. The subject is a 1/4 scale Loughead, (later Lockheed),
F-1 flying boat. This was the second flying boat designed and built by the
brothers Alan and Malcolm Loughead, and with the help of 22 year old
John Northrop, was begun in 1916, and first flown in 1918. This work was
done here in Santa Barbara, hence the Museum's interest in having our
model as a center piece for display. The F-1 was a twin engined biplane
with a 74 foot upper wing span, so the model has an impressive 18.5 foot
upper span! The hook is that this model has to fly by radio control, for
video purposes, before being hung on permanent display in the Museum.
We hope to keep the gross weight of the model to no more than 65lbs.,
so it won't sink too low in the water, and that's the reason for this
letter.
The tail assembly is supported by four booms, sort of like a pair of
crutches,
with appropriate struts & cables. As tail weight is critical with this
design, it
occurs to us that kevlar tubes for the booms would be about the best we
could do. My coupe has a kevlar motor tube that measures about .812
inches outside diameter, which is close enough to the scale .75 inches
needed, but it is only a foot long. What we need is about 5 feet long,
although we could tolerate some splices. If anyone can help us locate
this tubing, please let us know. Thanks.
Roger Grigsby, This email address is being protected from spambots. You need JavaScript enabled to view it.
SouthWest Regionals
===================
Here is information on the SouthWestion Regionals -
the first conest in the 2001 America's Cup. We published
it already but have been getting a number of enquiries.
>From: This email address is being protected from spambots. You need JavaScript enabled to view it.
>Reply-To: This email address is being protected from spambots. You need JavaScript enabled to view it.
>Subject: [pmac] Southwest Regionals, Eloy, AZ
>Date: Sat, 2 Sep 2000 00:01:25 EDT
>
>Yes, it's really kind of early to talk about a contest in January of 2001,
>but I've already had 2 emails asking about the date - so, here goes:
>
>51st Annual
>Southwest Regionals Model Airplane Championships
>13, 14 & 15 January 2001
>Eloy, Arizona [half way between Phoenix & Tucson] - where the January
>weather
>is generally pretty nice!
>3 contests + MECA [Model Engine Collector's Association] Collecto
>[swap/sell/etc engines/kits]
>-AMA/NFFA/SAM/FAC Free Flight; NFFS National Cup contest
>-FAI Free Flight; America's Cup + FAI Qualifying Contest
>-SAM RC Old Timers
>
>Get lots of info at:
>http://members.aol.com/allff
>where you can check out results of recent SWRs, including our adventures
>with
>ROW [Rise Off Water - from our portable desert pond!] that resulted in a
>new
>national AMA ROW Mulvihill record in year 2000, as well as the specifics
>about 2001 !
>AL - A. A. Lidberg; SWR Modelers Assoc. pres & AMA etc contest director
>BTW: pls pass this along to anyone who might be interested; Herman A -
>please
>pass to SCAT; SWRMA committee folks - pls check out all the links [only
>real
>change for 2001 is the split of BC Nostalgia into separate events so we'll
>have 2 more valid National Cup events]
...................
Roger Morrell
