SCAT Electronic News 21 November 2001 issue 645
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SCAT Electronic News 21 November 2001 issue 645
Table of Contents
=================
Reply to heat and steering wires - Van Wallene
Results of the 17th Annual Autumn Cup ? Seguin TX, Nov 10-11, 2001 - Simpson
The Jim Patterson Memorial 2001 - Bogie
Eloy Dates ? - Puhakka
F1C participation - Scott
symmetrical stab c.g. analysis - Skykieng
Looking for GPS ? - Katyba
Thanks
Reply to heat and steering wires
================================
Author : This email address is being protected from spambots. You need JavaScript enabled to view it.
Different materials have different thermal expansion coefficients (tec).
For isotropic materials this is a known material property, but for
anisotropic stuff (composites) things get a lot more complex. Some
fibres even have a negative tec (like Kevlar and some carbon fibres) and
all resins have a positive tec. This can be put to use in designing zero
tec composites. Some parts of spacecraft (like doors that must maintain
a proper seal) are designed like this as the temperature differences can
be huge (sun vs shadow in space) by combining appropiate percentages of
negative tec fibres and positive tec resins taking into account fibre
orientation as well.
In FF models another problem occurs. The tail booms (in particular those
fancy exposed carbon ones) act as an oven. Although the thermal capacity
of the boom itself is relatively low (a bit of airflow will cool it down
fast), radiation to the air inside the boom can cause high temperatures
of the steering cables with resulting expansion of (metal) wires.
So in practice a tailboom / wire setup can be designed to have equal
expansion when exposed to slow temperature changes, however direct solar
radiation will cause different temperatures for wire and tailboom.
Best option is to use a double pull wire / pulley system (like M&K servo
tail system) for both rudder and stab to avoid any problems.
Differential expansion of tailboom and wires will result in more or less
tension in the wires, but trim will not change (unless both wires heat
up differently due to......splitting hairs;-)) Stability of a setup can
be tested by spraying freezing spray (as used in electronics) or using
spraycan dusters (held upside down to spray liquid gas) inside the tube
and watch those tailfeathers move!
Results of the 17th Annual Autumn Cup ? Seguin TX, Nov 10-11, 2001
==================================================================
Reported by Reid Simpson, CD.
The contestants at the 17th Autumn Cup were rewarded with great weather . A
front that had been pushing southward stalled north of us and gave us
excellent flying conditions. The first round was flown with a northeast wind
which really handicapped us with a bad downwind condition so the max was set
at 2:00. A hard wind shift at the start of round 2 to a southeast wind
caused a delay in starting the round until the flight line could be
established at the south end of the field. For the remainder of Saturday,
the wind was erratic, sometimes heading straight west off field into the
creek bottoms or shifting to the east into large heavy mesquite thickets.
Consequently the max was maintained at 2:00.
By the start of the fly-offs the wind had settled into a slow southern drift
up the field which allowed us to fly the 5 and 7 minute rounds without
having to move the flight line. F1A and F1B were both settled in their 5
minute round while the F1C fly-off went to a 7 minute round which was
concluded in deteriorating daylight. All in all the fly-offs were a great
conclusion to a wonderful day of flying.
One of the great things about the Autumn Cup is that in addition to the
American Cup events we include 2 additional events. Open Gas (Any powered
ship with any fuel but flown to FAI flight rules, 5 sec motor runs, and
flown by rounds) and P30 which is also flown Saturday but not by rounds).
For 17 years we have had a large number of open gas entries and the event is
well contested. The P30 event has been included for the last 2 years and is
also well contested. Including these two events has given us a very good
turnout annually at both the Autumn Cup and the Spring Cup held in April
each year and gives everyone here in the Texas area 2 strong competitive
contests flown under American Cup rules to attend. This year we had 29
contestants.
Sundays Flying of the Mini events also enjoyed good weather. The absence of
wind proved to be a blessing for Jackie Sheffer who watched his F1J model
climb to a speck in the sky when the timer malfunctioned. Jackie flew a
second model planning to find his flyaway model with his Walston unit
following the official flight. By the time Jackie has retrieved his second
model a driver on Highway 90A which crosses the end of the field to the
north, found Jackie's ship sitting on the side of the highway and drove into
the airbase with the model. No reward accepted, just glad to get the model
back to the owner.
Our Saturday night award dinner was well attended at a wonderful Mexican
restaurant. The flying was great and we had a great time. Come join us next
year at one or both of our American Cup contests in Seguin, The 9th Annual
Spring Cup in April, and/or the 18th Annual Autumn Cup which will be held
the 2nd weekend of November, 2002. We hope to see your there.
F1A
Steve Spence 120..120..120..120..120..120..120..840..292 1132
Mike Fedor. ..120..120..120..120..120..120..120..840..171 1011
Jackie Sheffer .043..120..110..120..120..120..062..695
Mike Reeve . . .120..120..050..120..039..120..120..689
George Avila . 120..050..056..120..120..120..087..673
Jon Schelp.. ..120..000..120..049..107..120..120..636
F1B
Fred Pearce ....120..120..120..120..120.120..120..840..300..1140
Edward Wiley . 120..120..120..120..120.120..120..840..296..1136
Richard Wood 120..120..079..120..120.120..120..799
Mark Troutman.. .000 ....000
F1C
Henry Spence .120..120..120..120..120.,120..120..840..300..384 1524
Faust Parker ...120..120..120..120..120..120..120..840..300..340 1480
Reid Simpson. ...120..120..120..120..120..120..120..840..300..335 1475
Mark Troutman ...113..120..089..069 .391
OPEN GAS
John Irwin . .. .120..120..120..120..120..120..105..825
George Avila. .. .120..120..120..120..120..120..065..785
Jackie Sheffer .. .094..120..116..120..120..073..120..763
Russ Snyder ..... 120..120..120..120..054..100..120..754
Mark Troutman. ....097..120..103..120..078..120..078..716
Mike Fedor .. .120..048..088..085..083..087..000..511
Charlie Bruce ....107..107..000..120 ..334
C.C. Johnson .. .102..050..120 ..272
Bill Shaw . .118..024..120 ..262
Marvin Mace. .. .079 ..079
P30
John O'Dwyer .. .120..120..120..360
Eddie Vanlandingham....120..100..120..340
Craig Hollier . ..076..120..093..289
Jackie Sheffer . 120..063..101..284
Don Hockaday ...044..120..115..279
George Patrick ... ...084..069..120..273
Robert Shields . ..106..070..084..260
Robert Petrinsec . 057..081..046..184
Art Milam . ..000 ..000
F1G
Frank Parmenter.. .....120..120..120..120..120..600
Eddie Vanlandingham ...120..120..120..114..120..594
Edward Wiley ...120..120..087..120..092..539
John O'Dwyer ... ...092..100..088..111..120..511
Richard Wood ..120..120..038 .....278
Fred Pearce ...000 .000
F1H
Mike Fedor ..100..120..120..120..120..580
Steve Spence ...120..105..120..087..120..552
Mike Reeve ..045..120..120..095..120..500
Jackie Sheffer. .... 072..079..048..039 ..238
George Avila 030..041..120 ..191
Mark Troutman . ...087 ..087
F1J
Faust Parker.. . .. .120..120..120..120..120..600..180..780
Mike Fedor 120..120..120..120..120..600..129..729
Russel Snyder .......120..120..120..120..120..600..104..704
Jackie Sheffer .. ..120..120..120..120..096..576
John Irwin .. 120..120..120..120..000..480
Marvin Mace .. 120..000..120..120..111..471
Bill Shaw 120..120..120 .360
Mark Troutman .. 104..120 .224
C.C. Johnson .... .120 .. ..120
Henry Spence .000 .. ..000
Fred Carstens . 000 .. . ..... .. ..000
The Jim Patterson Memorial 2001
===============================
From: Bogie
Lost Hills, California
F1A
1 Hines 210 180 180 180 180 180 180 300 325 1915
2 T Coussens 210 180 180 180 180 180 180 300 294 1884
3 J Parker 210 180 180 180 180 180 180 300 241 1831
4 Diez 210 180 180 180 180 180 180 300 200 1790
5 McKeever 210 180 180 180 180 180 180 201 1491
6 Hernandez 210 180 180 180 180 180 180 183 1473
7 D Parker [J]210 164 180 180 180 180 180 1274
8 Busnelli 173 180 180 180 180 180 180 1253
9 Brun 147 180 180 180 180 180 180 1227
10 N Smith 132 180 180 180 180 180 180 1212
11 Van Nest 210 180 180 180 180 180 100 1210
12 Allnutt 210 180 180 180 180 146 75 1151
13 Cowley 210 180 103 134 162 180 180 1149
14 K Joyce 125 180 180 180 180 180 105 1130
15 Limberger 210 180 180 134 180 180 55 1119
16 B Coussens[J]210 180 180 0 180 180 180 1110
17 Koslyuk 210 180 80 180 180 180 25 1035
F1B
1 Piserchio 210 180 180 180 180 180 180 300 387 1977
2 Ghio 210 180 180 180 180 180 180 300 375 1965
3 Fitch 210 180 180 180 180 180 180 300 353 1943
4 Lueken 210 180 180 180 180 180 180 300 344 1934
5 Morrell 210 180 180 180 180 180 180 300 330 1920
6 Pratt 210 180 180 180 180 180 180 300 301 1891
7 Nelson 210 180 180 180 180 180 180 300 262 1852
8 Batiuk 210 180 180 178 180 180 180 1288
9 Tymchek 210 180 180 180 177 180 180 1287
10 Myers 210 180 180 180 176 180 180 1286
11 Booth 210 180 180 180 180 175 180 1285
12 Schroedter 210 180 180 180 180 167 180 1277
13 Blake Jensen 210 180 180 180 180 163 180 1273
14 Brian Van Nes210 180 171 153 180 180 180 1254
15 Dane Jensen 210 180 152 160 180 180 180 1242
15 Rohrke 210 180 180 180 180 132 180 1242
17 Dorsett 210 180 149 180 158 180 153 1210
18 Wood 210 180 180 149 105 180 180 1184
19 Ulm 210 140 180 138 111 95 180 1054
20 Kendy 210 180 163 0 0 0 0 553
F1C
1 Simpson 240 180 180 180 180 180 180 300 420 466 2506
2 Kerger 240 180 180 180 180 180 180 300 420 431 2471
3 Warren 240 180 180 180 180 180 180 300 420 380 2420
4 Happersett 240 180 180 180 180 180 180 300 347 1967
5 Doug Joyce 240 180 180 180 180 180 180 277 1597
6 Gutai 240 180 180 180 180 180 94 1234
7 Menanno 122 180 180 147 180 151 152 1112
8 Gewain 240 180 180 180 180 65 1025
9 Oliver 240 180 180 175 775
F1G
1 Wood 120 120 120 120 120 180 240 300 166 1486
2 Morrell 120 120 120 120 120 180 240 283 1303
3 Brocks 120 120 120 120 120 180 240 259 1279
4 Lueken 120 120 120 120 120 180 240 173 1193
5 Booth 120 120 120 120 120 180 240 127 1147
6 Emery 120 120 120 120 120 165 765
7 Tymchek 120 120 120 120 120 156 756
8 Myers 120 120 120 120 120 100 700
9 Schroedter 120 17 120 120 120 497
10 Griggs 120 120 120 360
11 Pratt 120 108 228
12 Nelson 90 120 210
F1H
1 D Parker [J] 120 120 120 120 120 180 240 300 360 143 1823
2 Busnelli 120 120 120 120 120 180 240 300 204 1524
3 Hines 120 120 120 120 120 180 240 300 172 1492
4 B Van Nest 120 120 120 120 120 180 240 150 1170
5 McKeever 120 120 120 120 120 150 750
6 Cowley 120 120 120 120 120 50 650
7 Smith 120 120 120 120 114 594
8 Norton 115 120 120 120 87 562
9 Ben CoussensJ103 120 87 120 120 550
F1J
1 Warren 120 120 120 120 120 570 1170
2 Gutai 120 120 120 120 120 564 1164
3 Menanno 120 120 120 120 120 424 1024
4 Robertson 111 120 74 117 120 542
5 Hernandez 21 24 63 110 218
Eloy Dates ?
=============
Author : This email address is being protected from spambots. You need JavaScript enabled to view it.
Roger,
Could you plase put this question to SEN.
What are the dates for the Arizona, Eloy contest in January.
Risto
F1C participation
=================
Author : This email address is being protected from spambots. You need JavaScript enabled to view it.
F1C and ground effects
Years ago, some clever motor racing developers devised a "ground effects" vehic
le
in which the airflow under the car generated such a low pressure that the vehic
le was
sucked down onto the track, enabling vastly increased cornering speeds.
Fortunately the development was banned. "Fortunately" because if it had been
permitted, there would be few drivers today who could control such a vehicle,
and international motor racing would have degenerated into a showcase for the
skills of a very exclusive few.
When did F1C permit its equivalent of ground effects? Not with the geared motor,
which is merely the latest in a series of developments to progressively put F1C
beyond the consideration of almost all power flyers. I suggest that F1C's
turning point, the point at which it started to become exclusive, was the permi
tting
of composite structures. Greatly improved strength and rigidity allowed the use
of ever more powerful / expensive motors, motors that would have been
unusable in an all-wood model.
To get more participation in F1C it may be necessary to ban "ground effects"
and forgo the luxury of technology at all costs. A return to traditional all-wo
od
models would restrict the use of super motors, it would make models once again
buildable in a home workroom, motors would be affordable, creativity would once
again be the domain of all rather than a plagiarized few.
And, by the way, despite its many performance-reducing regulations, motor racing
still provides a supreme challenge to drivers, and a spectacle to observers.
Bernard Scott
symmetrical stab c.g. analysis
==============================
Author : This email address is being protected from spambots. You need JavaScript enabled to view it.
Dear Mr.John Barker, Esq. You must be psychic ...I pose a question
on SEN and your response comes before the radiation from the
electronic cascade of my communication has dissipated into
hyperspace! Way to go!
Thanks, etc., Skyblasted, Denver.
Looking for GPS ?
==================
Author : This email address is being protected from spambots. You need JavaScript enabled to view it.
Dear Mr. Roger Morell
I ask you to place my message in SCAT News.
I ask to respond everyone, who has the information on extrasmall
emitters (transmiters), which one can be watched GPS. The arranging on
models of such "riser angle beacon", will allow not only to remove all
problems with delivery of models, but also can serve the most impartial
arbiter during holding competings. The capabilities GPS are vast.
Best regards.
Sergey Katyba. This email address is being protected from spambots. You need JavaScript enabled to view it.
Thanks
======
Thanks to Ed Wogulis for his donation in support of SEN.
.....................
ROger Morrell
