Radio Control: Electrics

K RC ELECTRIC Fly January column has traditionally described annual KRC Electric Flya timing occurs because issue normally written shortly after event takes place year However MA has recently revised its column submission schedule material January issue now due before traditional meet date third weekend September would seem mean February column would likely place coverage however because some very good fortune year wont very good fortune just mentioned thatfor first time everMitch Poling has E-writer longer anyone know attended 92 meet agreed write feature coverage Model Aviation Mitch came way Germany participate annual Greatest Electric Show Earth Im personally delighted gratified MitclVs E-writings during mid-1970s instrumental easing early entry Electrica fortune great cannot possibly thank him enough now Ive chance meet fly dine Mitch also share pages MA him [Editors note Publication article has yet scheduled] However can probably understand very hard relinquish reference years KRC Electric gathering Im including two photos Im particularly happy witha token coverage sorts Alsoand really cant resist Rolls event won regular attendee Chris True Peekskill New York geared 40-motivated Senior Skyvolt Chris did required 30 rolls 20 seconds flat Wet fliers take note Chris Senior also got third Saturdays Pilots Choice award Does make feel good what Having just mentioned column scheduling let emphasize obvious takes l-o-n-g time get something print always didbut now takes longer example particular column slated February 1993 issue MA has to editorial office October 10 1992 Folksthis makes very hard get timely information example such items meet announcements must get sooner beforeand folks hard time old deadline first place long lead time very hard IR ADIO CONTROL understand Im inclined very irritated know deadline doesnt have early because Electricwriting friends John Mountjoy Charlie Spear get RC Report column turn around much quickly Maybe RCR doesnt use computers Whatever reason please keep mind send such things meet announcements Theyve got get long time advance meetat least three months hope give folks little bit advance notice example event last part June notice could appear column August issuebut would give readers week advance notice better results youd want notice July issue earlier would mean notice ELECTRICS er arrive mailbox no later first March Get picture Incidentally above fully explainable philosophy life subscribe long-term average everything tends worse can quote half-pack switch often found use during popular activities Electric meetsthe All-Up/Last-Down AULD event AULD just what name implies participants launch simultaneously last land wins year KRCs AULD 15 participants day crowd-pleasing fun activity brings out its share clever modelers Ive seen folks plan scheme own approaches extending flight times uary 1993 75 Columnists present 92 KRC meet include standing L R John Mountjoy Bob Afflerback Ted Davey Don Mott Mitch Poling George M Myers Kneeling Bob Kopski left Charlie Spear right could happen KRC 1992 KRC Electric Fly held special rattle benetit US I3 team prize four-channel Futaba radio Team member Steve Neu left shakes hands Penn Valley Hobby Center proprietor Bill Shive center donated radio meet CD John Hickey right holds check proceeds should buy SR battery pack Thats great question Usually people call us first time want know packs really worth $5 S6 price ordinary pack Theyve heard friends read P/C magazines packs best what really makes better fact make packs Space Shuffle Program Army Navy Marines Air Force NASA Lockheed Boeing name few might sound impressive However Important thing packs make Military Aerospace Industry identical packs make use same cells same construction same testing same people over 10 years SR Batteries has leader P/C field just few things make SR pack better Only SR uses screened matched Aerospace grade cells Only SR guarantees pack never form memory gives year warranty. Only SR puts pack through 5 days electronic testing make sure pack perfect Only SR vibration tests pack. Only SR tests pack charge retention. welded internal external construction. SR packs can fast charged. SR packs give flying time less size lighter weight. Only SR will custom make size shape pack specifications no extra charge. Only SR maintains Hotline phone number can call help P/C problem question Well answer questions help select what need what dont place order receiver transmitter Electric Flight pack other Electric Flight needs Just give us call 516 286-0079 send $5 new product technical Information gLades both Electric Flight well Aerospace grade receiver transmitter battery packs open 9 3 Eastern Time Zone Monday through Friday SR BATTERIES INC. BOX 287 BELLPORT NEW YORK 11713 516 286-0079 FAX 516 286-0901 efforts usually involve aspects plane power system makeup can imagined lots emphasis normally put motor control battery utilization approach latter use half-pack switch nothing Continued page 127 Servo driven OPOT Center Off switchFuseTYPICAL HALF-PACK SWITCH SCHEMATIC eg Radio Shack #2751 545 o N/C 0 N/C _OPOT Arming Switch eg Radio Shack#275-1 546 BatteryI Battery #2o____________ Charge Connectors required N/C onnection _optional NOTE Charge batteries 1 & 2 series 76 Model Aviation e center Close-up strain relief receiver cable discussed text Flightec speed control shown Glue short plastic tubing showncarefully Above lightweight speed control its housing adds fractional ounce total weightworth advantages offers Theres foam tape perimeter saddle housings base Above right Completed speed control housing perspective place yet plastic tape hold cover Bottom housing has Velcro hold control fuselage Note thread wrap around edges strength Charles St info & directions call Dr Sandy Frank 817-599-7131 Sponsor WEATHERFORD AERO MODELING SOCIETY FL APR 3Fort Myers FL El 2nd Annual Swap Shop & Auction 900 am -400 pm 800 am Sellers Corkscrew Woodlands Esif 19 W off 75 Corkscrew Rd 1/4 M 75 Larger Hall Tables $10 Advance Reservations Definitely Recommended Admission $2 Paul Barfos 1002 Washington Ave Lehigh FL 33936 PH 813-368-0214 Sponsor SW FLORIDA AERO CLUB LISTING AD INFORMATION NORMAL LISTING AMA sanction issued event event will listed automatically Contest Calendar section listing will give date place name eventplus competition events flying site Contest Director name address Use Supplementary paid Ad space suggested description unusual special events deviations AMA rules significant aspects meet Paid ads may helpful promoting funfly-type meets give directions flying site SUPPLEMENTARY ADS Larger ads can inserted Contest Calendar section paying fee ads accepted AMA-sanctioned events FEE Fees based ad size whether sponsor AMAchartered club AD POLICY SIZE 1/s-in wide either /4 1/2 2/4-in high full size ad appears Contest Calendar section PRICING 3/4$8 1/2$16 2/4$24 time ad run payable advance AMA-chartered clubs pay half rate AD PREPARATION advertiser must prepare Supplementary Ad Ads must full size see above Ads made up dark black white background will reproduce well recommended ad made heavy paper lightweight cardboard PLEASE DO NOT USE PHOTOGRAPHS ON ADS SUBMITTAL DEADLINE effort will made include Supplementary Ads received 14th month issue reaching readers approximately fourth week following month However cannot guaranteed ads published space-available basis normally two-month lead time required inserting Supplementary Ad same deadline will apply sanctioned events listings Questions about either Supplementary Ads regular Sanctioned Events listings should directed Debbie Brown AMAs Competition Department Send ads AMA HO Attention Competition Dept Renew 93 Built FlewlLehman Continued page 20 tempera paints later covered engine area clear dope should also mention tops bottoms fuselages midwing sheeted areas covered classroom tablet backings As project neared completion put several hours covering wings installing hardware radio engine maiden flight Pan Am took place evening April 16 Uncertain outcome made arrangements student present Joshua Smucker young man likely become pilot accompanied full throttle airliner sluggish fresh spring grass did take off fly nicely Unfortunately covering wing began loosen after two laps bring down remarked handy have throttle control cases like too dark repairs second flight Joshua went out again three evenings later time went extremely well Joshua outside circle throttle did takeoffs touch-and-goes slow approaches Communication hand signal week later April 23 students built Pan Am took turns being copilot enjoyed immensely After safety lesson person took turn throttle control about five laps before handing transmitter next pilot Later transferred engine radio Swissair second class its session Both classes preferred high-speed flight after deliberating beauty slow planned approaches gentle flybys persisted flying full tilt Throughout sessions however no matter what kids did throttle planes handled well enriching enjoy able venture kids made sure knew highlight school year Its too bad well probably never know what effect experience futures youngsters Wouldnt neat least came across article 20 30 years now wrote letter editor her/Lehmberg Continued page 27 same altitudethough lot closer little up stick will drop tail increase sink releasing stick will give nice touchdown Like Feather Merchants 72-inch version has wide stall tolerance stalled still mushes along instead pitching down can exploit tight turns glide using some up elevator strong rudder Oh yesI almost forgot Dont think ailerons Feather Merchant want everyone builds Feather Merchant have ball would like picturemaybe have questions problems like drop line 21337 Oak Park Lane Anderson CA 96007 An SASE would appreciated remember reading somewhere closing seems appropriate See ya Chicken House yhear /doBolt Continued page 30 Im going break off discussion point remainder fairly lengthy Save portion continuity reference study concluding part Part Two will cover process developing force arrangements model get ultimate flight performance Ill also talk about trimming methods continued lectricslKopski Continued page 76 fancy wiring harness incorporating double-pole double-throw center-off DPDTCO DP on-off-on switch associated wiring also requires battery made up two half-packs having same cell count cell type idea behind scheme use two packs connected series high power same two packs connected parallel cruise power connection accomplished servo-driven switch described above Thus in-flight switching between two available voltage levelsand off wellis readily accomplished Andjust theres no misunderstanding cells arrangement charged senes Ni-Cds never charged parallel wiring diagram gives details actual use plane motor prop configured cruise climb slightly voltage available paralleled half-packs half voltage higher voltage associated cells series results relatively aggressive climb capability needed center-off switch option allows charge conservation during thermaling Since much total flight time likely occur cruise power levels battery efficiency during periods considerable interest argued parallel-connected half-packs afford increased efficiency since half nominally operating half total motor current Cells tend display somewhat higher capacity lower drain rates conversely somewhat lower capacity higher currents February 1993 127 II As above enough some serious contenders go far incorporate speed control power system well premise finer power control further extends battery reserves involved installations speed control connected receiver throttle channel usual switch servo operated auxiliary channel does really work sure seems someIve witnessed subject AULD serious modelers usually use either sailplanes OTs Both effective contenders fact earlier year witnessed relatively simple though large 01 easily beat contemporary sophisticated sailplane fancy gadgets course can work other way around too lot depends pilot luck point can safely consider either model type next AULD project variety speed controls market some come opencircuit assembliesie uncased units Examples latter include Flightec product line use Personally prefer install such assemblies native state rather use some suitable protective enclosure course E-modelers just install em also have done past rate Ive grown prefer housed approach ease installation model prevent some commonplace motor brush dust coating electronics afford some degree physical protection control event flight mishap read crash Three months photos illustrate what mean begin providing some strain relief speed control receiver cable carefully 9 gluing short length plastic tubing somewhere assembly example pictured Ive glued tubing top integrated circuit drop CyA cyanoacrylate glue some accelerator tubing needed usually work well tubing case piece Du-Bro green heat-shrink type shrunk receiver cable slipped through glue dry soldered place accordance speed control instructions Next configure simple wooden box just nicely fits outline particular printed circuit board pictured uses 1/M ply base frame outline /8-in-thick balsa strip chosen frame height such tallest components clearedexcept very tallest ie MOSFETs metal-oxide semiconductor field-effect transistors protrude purpose placed path flowing air within plane frame side has notch required exiting wiring made wire pass large enough Sermos connectors clear time entire circuit assembly can easily installed removed wooden enclosure Also frame has several wraps heavy threadglued cyanoacrylateto further strengthen assembly Note thread cut away wiring notch CyA has set inner floor box example outlined Vi x /4-in foam saddle tape provide perimeter rest PCB assembly keeps little soldered wire protrusions bottom PC hoard hitting ply floor Note also foam tape rest cleared near wire exit clearance notchthis because massive wire/solder blob large-gauge wires connected bottom PC board enclosure completed setting top cover place shown lamination Ai ply inner-fitting A6 balsa plate cover has two holes access speed control adjustment screws shown plastic tape holds cover place speed controls installed using double-stick Velcro pieces assembly no exception visible anyway piece material bottom wooden box mates its coun terpart suitably adhered inside fuselage Ive using Radio Shack part #64-2345 years feel good simple enclosure Phil Thayer himself man behind Flightec regular attendee KRC meet told liked whole idea too think youll find well worth effort Earlier column wrote Mitch Poling lengthy career writing about things Electric Mitch has written Electric column Model Builder magazine about 13 years Prior column now long defunct RC Sportsman tabloid has also written numerous feature articles several other magazines author book Building Flying Electric Powered Model Aircraft published Kalmbach fantastic thing occurred 92 KRC Electric Fly Seven writers Electric columns attendance unhappy see Mitchs column published preceding three issues MB felt Electric needs much exposure possible modeling press After part hobby now growing leaps bounds us appears obvious Electric destined quietly power modeldom 5 future Maybe good place go back earlier part column reread bit personal philosophy always try close column very upbeat waybut given situation Mitch Poling bit difficult month Ill just offer following Thank Mitch youve done both Electric movement over years doubt Id have good Electric life Ive enjoyed years Electric writing Thanks again Mitch Please enclose SASE corres pondence youd like reply hampslRichmond Continued page 39 Round five Jody switched modified Czech Mate because wind flight very high another max Scott went up okay overly tight turn brought him down 45 seconds Jeff s lowlaunch problems continued down 74 seconds Ukrainian flier Alexandr Jurtchenko zoom-launched plane dove straight crash feet Hey gliders can dangerous Round six Jeff went up first good flight lost view below horizon 165 seconds Jody tangled lines another flier during mass launch able refly went up again quickly zoomed good thermal yet another max Scott first landed dead air line still attached reflight glider did wingover dive released line save plane Miraculously thermaled away carrying line finally landed corn two miles away found because its radio Good flight no time given because attached line Both Andreas Motsch Birgit Puttner German team dropped round after unbroken string maxes Birgit few girls competing championships Both mother accomplished FlA flier enthusiastic participants Round seven max Jody along five other flierswould clean seven rounds Everyone watched apprehension thought mom going have nervous breakdown launch great gave plane lots mental lift soared high sky max flyoff Spanish FlA flier Roberto Rodriguez sprained ankle Finnish chaser suffered dehydration concluded FlA flying hard contestants chasers moms also surprised learn storks deliver babiesa group attacked Finnish FlA model causing severe damage Scott made max Jeff s launch problems ended day him FlA fiyoff240 seconds Six contestants maxed out would have flyoff evening Jody checked wind velocity 8-10 mph over runway Because shift wind direction starting line Continued page 130 128 Model Aviation