SCAT Electronic News July 2 1999
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SCAT Electronic News July 2 1999
Table of Contents
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NFFS Sympo Announcement - Perkins
RE: Temperature reading - Gregorie
FAI in Canada - Coussens, Markos [and Sugden ?]
Flyoffs - Blackam
Pre-publication Announcement.
=============================
1999 NFFS Symposium Report.
Bob Perkins, Editor.
Ross Jahnke, Associate Editor.
Copies of the Symposium Report may be ordered now by NFFS
members for $25.00 and by non-members for $29.00 payable to
the NFFS (US dollars). Add Postage of $4.00 by Priority Mail
for USA only and $4.00 Surface Post for the rest of the world.
Send payment to:
NFFS Publications
Robert McLinden
3903 West Temple Place
Denver, CO 80236
The Report will also be available for purchase at the AMA
Nationals, August 1-5, 1999, Muncie, Indiana.
1999 NFFS Symposium Report.
Table of Contents.
(vi) Forward. Frank Zaic.
(vii) Introduction. Editor.
Model Design, New Construction and Flight Adjustments.
1. Applications of rubber model design theories. Peter King.
2. Trim and stability in free flight. William F. McCombs.
3. Basic dynamics of airflow and lift generation. Reid Hull.
4. Altitude effects on rubber model stability and performance. Len Sherman.
5. Use of models to solve problems of full-scale airplanes. Hewitt Phillips.
6. Coconut concept for light construction of scale models. David Rees.
7. Experimenting with microfilm. Hermann Andresen.
8. High ceiling aluminum-skinned wing IHLG. Len Surtees.
9. Comparison of small rubber, electric and CO2 power sources. Fritz Mueller.
Testing.
10. What's up front still counts. Jean Pailet.
11. Static propeller testing. Richard Nelson.
12. Rubber testing techniques. Robert Piserchio.
Model Components and Support Equipment.
13. The indoor model box. Jim Richmond.
14. Skywalker Mulvihill propeller. Joe Williams, with Stephen E. Sova
and Bob Hatschek .
15. The Liberty propeller. Bob Hatschek.
16. High-tech rubber motor winders. Orvill Olm.
17. F1B: combining components. Louis Joyner.
18. TAN II rubber: a journey. John Clapp.
19. Electronic timer development. Allard van Wallene.
20. Story of an F1A strain gauge tow hook. Ken Bauer.
21. Onboard electronics: are they worthwhile? William Bogart.
22. Mini-Combo Seelig timers: set-up, use and care. Robert L. Perkins.
Model Spotting, Tracking and Lessons Learned in Retrieval.
23. Binoculars: characteristics and choices for use in competition.
Fred Pearce.
24. Model retrieval with auto-mounted whip antennae. William Prensky.
25. Using your radio retrieval system. Stephen L. Spence.
26. GPS: a position paper on use in retrieval of model aircraft.
Julian Pennington.
27. Tale of a chase: "Eureka", in the tall corn. Chris Parkyn.
28. Tale of a chase: The search for a lost F1J. Robert L. Perkins.
Competition.
29. British SLOP: background, methods and the future. Phillip Ball.
30. Simple free flight power. Keith Hoover.
31. Wet weather flying. Michael Woodhouse.
Rules, Junior Programs and the Future of Free Flight.
32. The AMA Rules for thought. Jim Bocckinfuso and Brad Bane.
33. What's happening to free flight? Robert Johannes.
34. Beginner 2000. Jorgen Korsgaard.
35. Where are the youth in model aviation? John Clapp.
Recognitions, Awards and Honors.
36. Aeromodellers who helped change the world. Rex Hinson.
37. Ten Models of the Year. Larry Kruse.
38. Hall of Fame. Jim Haught.
State of the Society.
39. State of the NFFS. Robert Stalick, President.
RE: Temperature reading
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Author : This email address is being protected from spambots. You need JavaScript enabled to view it.
As an amplification of Bill's comments, you are likely to have introduced a
systematic error into your thermistor rig if you use one of the common
commercial LCD readout modules and have modified it to fit your thermal
pole.
These units send a short sine wave pulse through the thermistor each time
they sample the air temperature. This type of signal is affected by both the
type of cable connecting the module and its sensor and the length of the
cable. If you have changed the cable you have most likely changed the
reading for a given temperature.
In my experience lengthening the cable is likely to give a falsely high
reading of a few degrees. Extending the cable with the same type of wire
increases its resistance, which corresponds to a higher temperature reading;
if you turn the display on with the sensor disconnected it is likely to show
an 'off scale - temp too high' indication.
This reading error is no big deal for finding thermals because the
temperature changes caused by a thermal are unaffected.
Martin Gregorie
London, UK
Re: FAI in Canada
=================
Author : This email address is being protected from spambots. You need JavaScript enabled to view it.
This email address is being protected from spambots. You need JavaScript enabled to view it. wrote:
>
>
>
> Author : This email address is being protected from spambots. You need JavaScript enabled to view it.
> Subject : FAI in Canada
>
>
> Roger, I received a bulletin from the Toronto FAI group indicating 4 =
> contests at Borden this summer. The last is scheduled over the US Labor =
> Day weekend and is being advertised as an America's Cup contest. =
> However, I haven't seen the same information on the SCAT website. Can =
> anyone please confirm the America's Cup standing for the Labor Day =
> weekend?
>
> Chuck Markos
>
>
'Tis so. Please see the latest Scatter. 3-4 September, apparently no
mini-events. Call Dave Sugden at (905) 263-8316.
Tom
Re: Flyoffs
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Author : This email address is being protected from spambots. You need JavaScript enabled to view it.
It's interesting to hear some active competitors' views on the attempts
by the FAI to reduce FF performances and reduce flyoff numbers to
'manageable levels'. As a keen competitor for many years I have to agree
with Mike Achterberg and Dave Parsons about the importance to me of the
flyoffs. Although I do not always make the flyoffs I find them
exhilerating to be in or to spectate as the case may be. They are the
pinnacle of FF for me and, at World Championship level at least, a
fantastic spectacle.
The biggest problem of the recent W/C flyoffs has been the numbers in the
first couple of rounds. In F1A at Sazena there were over 40 in the first
(5 minute) flyoff. This is a great challenge to the organisers who have
to ensure that there are three competent timekeepers for each flier; in
the case of Sazena, more timekeepers than for the first round in the
morning. I don't believe the length of the flyoff flights is too great a
problem (although I do believe that one minute flyoff increments after
the five minute round would achieve the same result and be simpler to
time-but that's a different argument).
The number of competitors in the flyoffs has escalated for two reasons:
1, the transfer of technology from Eastern Bloc to the West after 1991
and 2, the increased number of countries participating since the breakup
of the Soviet Union.
I came up with a possible solution to the problem: Don't change the W/C
competition class rules; change the W/C competition format. Why not have
two preliminary heats wherein half the countries compete for a place in
the finals, then a certain proportion of the finalists (either individual
flyers or whole countries) compete in the final. This way the organisers
could control the numbers in each event to manageable levels.
The W/C would take longer to complete this way (but we generally run a
preliminary event anyway) but since the participation is increasing why
not make it an even bigger spectacle?
Or is this just a wild idea from a crazy Aussie?!!
Richard Blackam
........................
Roger Morrell
