Radio Control: Electrics

RADIO CONTROL ELECTRICS THIS MONTHS TOPICS include meet announcement some speed control discussion beginners advanced developmental motor power response shape control plus related proposal equipment manufacturers Michael Stewart 107 Taft Terrace Washington NJ 07882 Tel [908] 689 6981 sent announcement Tenth Annual LVRCS Electric Funfly scheduled June 7-8 LVRCS field near Easton PA terrific meet Ive over years Lehigh Valley Radio Control Society mixed-interest club much like KRC includes representative Electric interest group does fine job low-key gathering offering open-field use weekend several competitive challenges inclined field excellent recent trend indicator can expect about 50-60 registrants meet early enough can still see new E-projects just emerging Winter shop Motor controls include variable speed controls just plain on/off Nowadays virtually electronic nature relatively few mechanical/switch types use anymore thumbing through New Creations R/C catalog couldnt help notice some awe extensive listing motor speed on/off controls 48 individual model numbers including brushless motors list included some manufacturer names Im familiar also some unfamiliar products familiar industry names No wonder get considerable reader mail seeking help subject area simply dont know sort out offerings based such simple listing column has often mentioned ESCs use clearly routinely use recommendations fine far goesbut may automatically excluding unfamiliar product thats very good well Theres nothing can about thisId go broke tried available designs Ill always try recommend ESC response application/question presentedbut answer will based products use myself have seen enough use locally inquire about specific product have no reference Ill say Such necessarily negative response likely neutral Several months ago received sample ESC mail arrived no cover letter enclosed nor did follow no contact name assumed sample evaluation lacking personal communication reluctant invest much time pursuit did look ESC over read accompanying instructionsto dismay ESC manufactured company known aeromodeling world think may first E-flight product attempt appeared designed no significant E-flight experience behind relatively large heavy has bullet connectorsused RC cars commonly seen flight applications Despite extensive collection cables such could easily connect wanted would have go out purchase some unconventional wiring parts use bench airplane design seems limited 7-8 cell applicationsa unique limitation experience Further product inexpensive Without firing up item appears noncompetitive other E-flight ESCs would beginner know April 1997 99 MicroPro transmitter Emphasis Control knob right Auto Trim button Inflight adjustment easy THROTTLE STICK POSITION TO EMPHASIS CIRCUIT OUTPUT FUNCTION LOWER CURVE FOR EMPHASIS S ZERO UPPER CURVE FOR ITO MAX 25 CO I- 2 -j 0 0 15 C p CO 0 Wi N 4 o 05 z 0 0 1 2 3 4 5 6 7 B 9 10 11 12 13 CLICKS 200 150 ni MOTOR INPUT POWER vs TRANSMITTER STICK THROW FOR THREE EMPHASIS SETTINGS 0 100 0 z 0 1 2 3 4 5 6 7 B 9 10 11 12 STICK CLICKS S 01 Th2 (((XXX XX A A 04 A AWS 00000 S S S 555 * A AS 33 0 0 0 a3 0 iII 00000 0500 i 13 m----4-4 iI z 0 (A m 0 S * t AWN 12 i28 w w 00000 8 -WIi 0 0 0 C 10 co on- 000 0(3 0 0p OOIW XXX(XXX 3 -Il5 d3K Sd 0Z J04 A-I0 03 ~N0 - 0 00 Q3 00 XXX XXXX(X ((XXX (XXX (XXX (((XXX AA ASO 0- (XXX J S S S S S IflI II SAA3K 28[2J 0 000 0 0000 000 A0 (XXX(XXX((XXX (XXXXXXXXXX ZXX(XXXX r 555.~ 0 1 0A----4-j0 AA~.--rn AC S -00A0 50A000 SII S00000 0 0-XXXXXXXXXXXXXXXX 5 XXXXXXXj 3SA~A----- iIm C, ii 5 .Sdd00 '~ 55 AS AS 0SAAO0 0(AAAj SAAAA4~2 ~ j S030- IdSd P3AoOsAAAO84SAJAAj 0 I000SAAAW ii 0-----103 CA - 0 uu 0 m ((XXX 0((XXX &AA m 0001 A000 0A00 -- A0A0 (XXX (XXX X(XX 100001 (XXX U 0S00I 050A 0500 0-- 0SA0 SA--- SA-- S0-- 8.S0A -3XA0 00(00A0 I g uQ Q ~ en m C -u en en 4A CISC OS~ eno i S C W 9 C O co S 1 - ~ C3 sIn 18 0 1m 5 EI 0 --1 wu 3 -C ~ - 0 o 0~003 .0 00 0 0 0 3 0 0 o 00 -00 n0X00-0bOioo 3-- 0 S0000 -- 03300-0 -~00--00000 o 0 - 0 2 0-0 0-- 0~3 0-0 0 2 0 -i 0 00 0 -o 0 0 0 3 0 0~ 0 0 0 os00 0 - X3 -5 0 0-0- 00- 2 0 5 00 2 000-0 0 0 s-o 00 010-0 03 2 0 O 0- 0- 0- 0 0- 0- 0- 0 0 000 000-00 0 02 0 00 0 -0-00 00 0 0 0 9 1% 0 0 -I o 1 M 0-20 0 3 0 0 0- 0 Os - 00030000~00 0-0 31 0 30 0 0 2 0 0 0 X100 O300- 00 00 S 0 LKco SD -Jo0 0 wa-a o 0e OW i 1EeJwvAuiIkYLrEEUIUzhjpULwIEjAUIiw5YAwwUiIiwuib SANYO RC-2000 md Cells$650 Ea SANYO RC-2000 Matched md Cells$700 Ea SANYO 1700 SCRC Matched md Cells$500 Ea SANYO N1700 SCRC md Cells$450 Ea SANYO N1400 SCR md Cells$300 Ea SANYO N 1000 SCR Ind Cells$350 Ea SANYO N800 AR Ind Cells$350 Ea SANYO KR600 AE Ind Cells$ 250 Ea SANYO N350 AA lnd Cells$250 Ea SANYO 600 AA Rechargeable$ 150 Ea SAFT Full C Rechargeable Batteries$ 100 Ea 4 Cell 270 AA Receiver Pk$1000 Pk 5 Cell 1000 AE Receiver Pk$1800 Pk CONNECTORS red black$ 150 Pr -IRINK BARS AND BRAIDS VAILABLE Jomar SC-I published long ago dont have easy access reference As far know its very long time since ESC construction articles have published Given above enjoy building sorts modeling things including modeling electronics Ive toying original ESC design might article candidate distant future analog design no microprocessor features both low-end high-end adjustment screws interact significantly Experienced E modelers will immediately notice unique feature Beyond goodie however something much sophisticated shaped throttle response November 1996 column discussed throttle response motor power level function transmitter stick position graph real data typical motor/prop combination clearly showed typical severely nonlinear power input vs stick position relationship meaning lack thereof half throttle half stick similar terms interpretations also discussed developed column unrelated conversation Keith Shaw tried out new model usual rather nonlinear power response sparked intense personal interest basic nonlinear nature power control models Much professional life defense electronics industry devoted nonlinear circuit transfer functions So what does mean 11/96 column youll see beginning throttle stick motion takes lot stick get significant power motor Near high end power input range relatively little stick motion makes huge change motor power Both ends stick throw can have undesirable feelat low end 1120 Wrigley Way Milpitas California 95035 Voice/Fax 408 946-4751408 WiNGS-S 1 LOOK no further fully molded sailplane needs RnR offer selection high performance sailplanes will address specific requirements F3BThermal Duration Slope Cross Country Mark Allen designed World Championship F3B EAGLE now being produced RnR its new lower price RnR construction enhancements 1997 RnRs composite molded technology provides unique blend strength weight optimization Noticeable results found through increased durability torsional stability stiffness incorporated wing fuselage tail section also offer selection parts joiner systems scratch builders out catch latest visuals specifications competitive pricing RnRs sailplanes contact RnR RnR skys limit. 102 Model Aviation hless DC Motors tion lint 01 high performance Brushless motors Aveox now offering full line kits have machined cut parts made USA Aveux has complete line direct drive geared motors competitor sport flyer starting low $26995 motor/contrclier system Call Catalog veox inorors ana conrro,r3 jij viu Culinas #114 Westakt Villagt CA 91362 l1l-517-19t5 proudly made USA p//wvwaveuucomemaitu112252411@COmpuServtCOti Thirty- Minute Tote lly finished putting plane together make field caddy another assembly prolect US AirCores low-cost long-lasting GPU easy put together can way field ything need le 30 minutes Made durable fuel-resistant US AirCore corrugated plastic material Easy build Takes screwdriver anding gluing painting Lightweight well-balanced carrying comfort Offers room gallon can jug fuel fuel pump power panel 1 2V battery 1 2V starter props plenty odds ends location dealer nearest please call 1 -800-682-8948 Mention code 041 ii US AirCore~j~ Distributed exclusively through Great Planes Model Distributors RO Box 9021 Champaign 1161826-9021 Copyright 1996307701 B stick action soft high end its very touchy should remind using exponential control flight surfacessoft around neutral strong increasing deflection control surfaces behavior advantageous throttle its good After much thought seemed whats needed transmitter throttle stick response thats opposite exponential effect such response might built speed control tested Yes bent throttle response very nice fly effect dramatic sport models simply dont want fly conventional throttle response anymore whole thing really has cranked up its early December getting out serious flight testing very difficult So Im anguished enthusiasm being squashed impracticality cold dark wet dreary season have Ace MicroPro transmittera very easy-to-work-on box Ive installed developmental circuit throttle stick associated control knob box topan emphasis control adjustment knob smoothly variable 0 max over range degree circuit influence smoothly selectable accessory circuit its control knob bend bow otherwise-linear throttle stick response effect shown accompanying graph actual stick pot voltage emphasis knob extreme positions lower curve whats normally present transmitter linear response upper curve emphasis fully cranked up compressive nature curve obvious shown infinite number in-between transfer shape possibilities just imagine lower linear curve being gradually bent up upper shape emphasis control advanced full-down full-up stick position effects fixed repeatable throttle full off full always same However emphasis advanced rate change stick effect sharply increases just above off gradually slows full position approached stick response looks like log response varying strength emphasis control advanced fully emphasized transfer function segmented piecewise synthesis approximating log transfer characteristic look closely curve segments visible effect emphasis control knob blends upper lower curves produce intermediate resultant curve depending knob rotation Indeed infinite number transfer curves possible So whats Take look motor power curves ran geared car motor 10 x 6 prop 10-volt supply Motor control done transmitter receiver analog linear speed control adjusted speed control end points motor just started stick click up maxed out last stick click Focusing motor power curve set note horizontal axis marked stick clicks used natural stick indents data points Beginning lower power curve normalas emphasis circuit didnt existand attained emphasis control fully off shows highly nonlinear motor power input stick throw much like the 11/96 column middle curve emphasis control set somewhere between limits Notice power response much less nonlinear Finally emphasis control max effect great power curve nonlinearity actually changes opposite shape Again since emphasis control fully smoothly variable infinite set power response curves attainable So what flight sensation just great Very smooth non-sensitive flight power control possible low-end limp feeling high-end hairy feeling true several sport airplanes power systems Ive tried right feel can dialed emphasis controlin flight Im having terrific time can hardly wait summer really test stuff what does have opening ESC discussion Realizing transmitters have linear throttle stick responses seems appropriate incorporate such nonlinear system response ESC itself should relatively easy microprocessor controls also possible albeit greater difficulty classic analog controls have two developmental versions use now effect ESC response shaped act similar throttle stick curves What should obvious industry simple ESC manufacturers might very well consider programming options shaped responses controls Radio manufacturers might very well consider pseudo-log antiexponential transfer shape option throttle stick just like exponential surface controls already familiar transmitters opposite Betcha someday power response shape stuff becomes part routine feature set ESCs transmitters Remember read first MA OK industry will first such market entry So ends yet columnnearly time approach Spring Please enclose SASE correspondence youd like reply 4104 Model Aviation 4GPU Ground Power Unit USAP3000Accessories included