December, 2003 - RC Soaring
December, 2003Vol. 20, No. 12U.S.A. 3.50December 2003Page 1
TABLE OF CONTENTS3 "Soaring Site" . Judy SlatesEditorial . New Web Site for Houston Hawks. On the Home Front.Gift Idea Issue4 "On The Wing." . Bill & Bunny KuhlmanFlying Wing Design & Analysis . Jochen Haas' Taborca7 Review . Bill & Bunny Kuhlman. The Golden Age of Model Aviation by Alvin Sugar8 Christmas & Gift Giving Ideas . Dave Register. Bill & Bunny Kuhlman. Greg Smith. Dave Garwood14 Sailplane History . Anker Berg-Sonne. History of the Mantis20 Technical Analysis & Design . Mark Drela. Elastic Modulus of Common FoamsCopyright 2003 R/C Soaring Digest.All rights reserved.Page 2R/C Soaring Digest
TheSoaringSiteNew Web Site for Houston Hawks and special interest groups, as always,are exempt.e received a message from GarySeawright, webmaster for theGift Idea IssueHouston Hawks in Texas. They have anew domain name and web site:As most of you are aware, the writersand columnists volunteer their timehttp://www.houstonhawks.organd energy providing information onthe subject of their choice, and theyThe RCSD web pages were updated by only share information on sailplanesour web masters, B2 but, alwaysand related accessories. That meanscurious, we took a quick trip to thethat we write what we want to writeweb site to see what the Houstonabout and that we think will be ofHawks had to say.interest to most of you.WThere is a 30-Day Introductory PilotProgram, which “allows any person toexperience the excitement and challenge of radio-control soaring, whetherthey have a sailplane or not. Onceregistered, a person has 30 consecutivedays of FREE one-on-one flightinstruction with a certified AMAinstructor pilot using the HoustonHawks Hangar 9 Aspire. To start yourflight instruction, contact one of theinstructor pilots listed below.”List of Certified AMA Instructor PilotsMike KovacsDon ClevelandJack WomackThe Hangar 9 Aspire has a 79-inchwingspan with a modified Selig 7037airfoil. The Aspire uses 2 channels: onefor rudder (yaw) control and anotherfor elevator (pitch) control. The imageis available for viewing from their website.This month is no exception, as thisissue contains a special article, coordinated and edited by Dave Register, onthe subject of Christmas or SpecialOccasion gift giving ideas. Our thanksto all of the folks that provided information for the article and to Dave forhis coordinating efforts. (Being an editoris not always easy, and we appreciate it,Dave!)LTABORCAaunching Taborca at theTeck hills in southwestGermany.Jochen Haas’ Taborca is thesubject of “On the ‘Wing.” thismonth, written by Bill & BunnyKuhlman.And, in the midst of all this, in addition to writing his own column, Davehas some personal things happeningon his own home front. For those ofyou that know Dave, and for those ofyou that enjoy reading his column, aget well message would be wellreceived. He’s at RegDave@aol.com or, at least, he should be there ifthey’ve let him out of the hospital andgiven him his laptap computer back!Get well, Dave!Happy Flying!Judy SlatesOn the Home FrontThis past month, the RCSD ResourceListing for the U.S.A. was updated toreflect the latest contact information. Itis available for downloading from themain RCSD web page. Should any ofyou note additional changes thatshould be made, please don’t hesitateto let us know!Effective this past month, RCSD nolonger accepts commercial advertising.Personal advertising, club information,December 2003Page 3
surface deflections balance each otherout in the vertical dimension while atthe same time eliminating adverseyaw.For left yaw, the elevons and combiflaps operate in opposing directions sothat there is no pitch input, only anincrease in drag on the left wing.The flaps are used to assist the elevonsin elevator mode.The elevons and combi-flaps can bedeflected slightly upward to increasethe speed when traveling betweenthermals. A small amount of downward flap deflection is used to improve distance performance andthermal climb.The flaps and elevons deflect tomaintain pitch stability when omOJochen Haas’ Taborcaur “On the ’Wing.” column inthe August 2001 issue of RCSoaring Digest was devoted to JochenHaas. Jochen’s spreadsheet, formulated to assist in the design of sweptwing tailless gliders, remains availablein both Excel and AppleWorks formats. As that column was beingwritten, Jochen was working towardgetting a kit of the Taborca 3 manufactured by a major firm. This month’scolumn is devoted to examiningTaborca in detail and providing anAmerican source for the LET Modelkit!Taborca is an exceptionally beautifulswept wing sailplane designed forslope soaring and F3J flying. The wingutilizes the MH 45 airfoil, is sweptback 24 degrees, and uses what hascome to be known as a “six flap”Page 4Layout of the components of thecontrol system. There is no rudder. TheTaborca electric version.winglets increase the effective aspectratio from 12.8 to 17.combi-flaps are deflected downwardto act as air brakes. This is equivalentThe wing sweep of 24 degrees and the to “crow” on a conventional tailedsize and location of the various control aircraft, and Taborca will slow downsurfaces are coordinated so the liftto a crawl and land very easily.distribution can be tailored for separate flight regimes. Control surfaceDuring all flight phases the flightdeflections are set up so the yaw, pitch characteristics are very docile. Theand roll functions do not interact.performance envelope and speedrange of Taborca is very close toThe included illustration shows theconventional F3J models. The minicontrol surface deflections for variousmum speed is astonishingly low, andflight regimes.the climb performance whenthermalling is even better than convenFor roll to the left, the elevon of the left tional models.wing goes up and the combi-flap of theleft wing goes up to a lesser extent. On Full utilization of the six-flap controlthe right wing, the combi-flap goessystem mandates a sophisticateddown and the elevon goes down to atransmitter with a number of mixinglesser extent. The idea is to eliminatefunctions. Recommended transmittersany pitch change by having the control include the JR 10X and 8103.R/C Soaring Digest
December 2003Page 5
Taborca is a RTF sailplane, ready forinstallation of servos and other radiogear. It is obeche over foam withcarbon fiber spars and Oracover whichis professionally applied. The uppersurface is white, the bottom surface isof contrasting color. All controlsurfaces are pre-hinged and servocables are installed. The transitionsand wing-fuselage junction are improved over what is shown in theincluded photos, and the wingletshave been strengthened.An alternative fuselage for an electricversion is also going to be available.The original setup included a TorcmanTM 280-20-16 with a Master 40-3P 6-16NC opto Jeti speed control, 10 cells,and a 12.5x6 folding prop in a tractorconfiguration. Dieter Mahlein ofShredAir has suggested an improvedmotor drive system using high qualityLehner equipment: Lehner LMT Basic5300 motor and Reisenauer Microgear5:1 with BK/LMT Warrior 7018controller, 70A continuous and eightCP-3300 NiMH cells, zapped, in twosticks of four cells, soldered end-toend. This system would drive an RFM14x10 carbon propeller with a clampon Norbert Meyer Lightspinner(diameter to be determined). TheLehner system offers good performance at a relatively low cost of under 400 without the battery.There will be a molded version ofTaborca in the future. There is noweight or structural advantage to amolded wing — the only real difference is in the finish. The foam andwood wing is of course more easilyrepaired, an important consideration.John Derstine/Endless MountainModels is the U.S. importer for thisdesign via LET Model. The sailplaneconfiguration will be priced betweenUS 750 and US 900; no price range forthe electric version as yet. You canobtain information from the EndlessMountain Models web site news page http://www.scalesoaring.net/EMM/emm news2.htm . If you havean interest in purchasing a Taborca kit,contact John through Taborca@scalesoaring.net , a speciale-mail address.Page 6The relative size of Taborcais seen in this photo.The huge flaps are fully deflected inthis photo. The sub fin drives thewing to a negative angle as soon asthe aircraft touches the ground,eliminating any bouncing.Derstine, John/Endless MountainModels. RD#3 Box 336, Gillett PA16925. Phone: 570-596-2392, weekdayevenings 7:00 to 10:30 PM EasternTime. Weekends any time. johnders@npacc.net http://www.scalesoaring.net/ Kuhlman, Bill and Bunny. The flyingwings of Jochen Haas. RC SoaringDigest, August 2001. Available at -Haas/156Jochen-Haas.pdf , software at http://www.glide.dyndns.org/on-the-Access hatch open. The spar system doesnot produce any obstruction and all servosare mounted in the wings.wing3/156-Jochen-Haas/Haassoftware-Windows/ and -Haas/Haassoftware-Macintosh/ .—. Six-flap control systems. RCSoaring Digest, July 1995. Available inOn the ’Wing. the book, Volume 2 pdf , 9.9 MB.Mahlein, Dieter/ShredAir. P.O. Box10093 Eugene, OR 97440. 541-954-6842. dieter@shredair.com http://www.shredair.com R/C Soaring Digest
The Golden Age ofModel Aviationby Alvin SugarA Review by Bill & Bunny KuhlmanAlthough Bunny and I havedabbled with foam core vacuumbagged wings, our most enjoyable taskis the construction of a flying surfaceusing open bay construction. Theresulting structure, with transparentcovering and the sunset illuminatedsky gleaming through, is always asource of awe for us. And we findourselves much more satisfied beingable to maintain altitude in an eveningbubble of light lift than being able tospeck out in turbulent lift at midday.Additionally, after being in a thermalfor several minutes, we find ourselvesgetting bored. We find it very hard toresist the intense desire to come backupwind, land, and immediately launchagain in search of a new thermal toride. All of these tendencies contributeto our interest in Mr. Sugar’s ideas asto the real definition of soaring performance.The Golden Age of full size aircraftwas the period between roughly 1925and 1935. In that decade, man madeastoundingly huge advancements inaviation with tools no more sophisticated than the slide rule. The NACADecember 2003four digit airfoil series was developed,numerous aerodynamic devices wereinvented, engine performance improved dramatically, and controlsystems became more sophisticated.Aircraft performance made a giganticleap as a result of those innovations.In the mind of Alvin Sugar, the GoldenAge of model aviation, specificallywithin the realm of RC soaring, wasthe period from about 1965 to 1975.During that ten year stretch, proportional radio control became morereliable and light enough for use in aglider, and F3B came into existence.While Ed Izzo had demonstrated foamcore wing construction in 1964, openframework wings were still the normat the end of that period. The big RCsoaring leap came in the form ofadvanced flying skills rather thanaerodynamic improvements or construction methodologies, and theability to go out and “hunt” forthermals became a distinct advantage.In the intervening years, the basic RCsailplane has evolved into a “hightech” machine capable of travelinggreat distances at high speed and greatheights — higher-faster-farther. In themind of Mr. Sugar, however, soaringperformance has not really improvedmuch. Rather, RC sailplanes have beenAl Sugar’s Shuttle LastChance, his “ideal”sailplane for the low launchenvironment.designed and constructed to achieveextremely high launch heights, to theboundary between model and full sizesoaring and beyond.Mr. Sugar has written this book tobetter explain his philosophy as towhat an RC soaring machine shouldbe, based on his statistical methodology for evaluating performancethrough the “low launch.” The GoldenAge explores how the aerodynamicprinciples of lift and drag, stability andcontrol can be coordinated with mass,inertia, and other physical propertiesto produce the best soaring tool for thedesigner/flyer and his local environment. The articles within The GoldenAge therefore cover a very largenumber of topics. As a result, this bookis a 99 page collection of two dozenarticles which are devoted to aerodynamics and structures, physics andflying skills, flight altitude andweather.Al starts out with an explanation ofhow airplanes fly. (The Golden Age isone of the few resources which de(Continued on page 13)Page 7
Christmas & Gift Giving IdeasAt last, the 2003 holiday season hasarrived! With what this oldworld’s been through since last year,it’s really good to look forward to alittle peace and family time.From the RCSD TeamCoordinated by Dave Registerenumerated in the front of the catalog.We chose a set of five German madeclamps. They are exceptional and costless than 20.Other items ofinterest to modelers:Amidst all the ups and downs andturmoil in the world, there are at leasta couple of constants that we can count Bankers‘ scissors - 7" from pivot to tipof blades, 3/ 14.95. Great for cuttingon:Monokote and other covering materials.- R/C hobby folks are some of thebest people you’ll ever know, and- Building and flying R/C sailplanes Digital ”deep reach” calipers - 4" reach, 87.50 on sale for 79.95. You neverof any type seems like it’s tooknow when the deep reach mightmuch fun to be legal.come in handy.But legal it is! So to help you in your24” vernier calipers - reads in 1/128"quest to drop hints around the house,your RCSD columnists have again put increments (0.05mm) with 2 3/4" jaws.Made in England. 24.95. The 24"together a list of hobby items thatlength is a real benefit, and the price ismight be worth considering by yourright.significant other.side is etched in 0.5mm and 1.0mm,the other in 1/64" and 1/20" increments. 19.95. These come in individual plastic sleeves and are quiterigid. Have worked extremely wellwhen measuring and marking balsaand plywood parts.Razor scraper - Beautiful brass oversteel with a comfortable roundedshape and rubber bound edges. Threepositions, takes standard single edgeblades. 4.50 each or 5/ 18.30. Holdthe blade at 90 degrees for fine scraping, or at shallow angle to get epoxyand CA off glass building surfaces.(Can also be used at a shallow angle toscrape burned spill-overs from glassceramic stove tops.)Colorcoded miniature screwdrivers four slot, 2 Phillips. Four inches long inplastic case. 10.95, 2/ 18.60. Not thesets usually seen at Radio Shack andhardware stores.”Fast mount” shelves and tracks tracks up to 6', brackets up to 22". Verysturdy. Sold by individual pieces, 3.50 Square set - Fixed engineer’s squares 2"- 9.60. Utilitarian adjustable shelvesand 6", 4" adjustable square withwhich can take a lot of weight.regular and 45 degree bevel blade, 4"flat rule (inches and mm). Made inDiamond burrs - 1/8" shafts forIndia to tight British standards andDremel, etc. Cones, balls, points. 30packed in wooden box, 49.95. Usefulpieces in wooden box, 13.95; 50 pieces for setting up molds, built-up fuselages, wing ribs, etc.We’ve again tried to provide ideas that supplement set is 19.95; both sets for 26.50. Great for cutting out oddGarrettWadego from neat shop items to majorshapedplywoodbulkheads,shaping161Avenueof the AmericasYork,projects and a bunch of things inNY 10013between. Hopefully something in here small parts, etc.1-800-221-2942fits your needs and your familyCovered metal storage tins - Threehttp://www.garrettwade.combudget. Enjoy and Happy Holidayssizes from 1 3/16" x 3/4" deep to 2" xfrom all the gang at RCSD.7/8" deep. The two smaller sizes come Our balsa, plywood, and music wirein aluminum boxes, the large sizesupplier is:FROM BILL ANDcomes in a paper box. 12 small 8.95,Balsa & Hobby SupplyBUNNY KUHLMAN12large 9.95,20micro 10.49.Ifyou12020Centralia Suite Ghttp://www.B2Streamlines.comever wondered how to store replaceHawaiian Gardens CA 90716ment servo gears, small screws, orSome time ago we received aother odd items, this is it! Clear tops let Orders only: (800) 488-9525 7:00AM toGarretWade catalog. The catalogyou see what’s inside.7:00PM Mon - Sat PSTcontains some of the most beautifulInformation: (562) 865-3220 7:00AM totools we’ve ever seen.Mini pliers - rubberized grips, serrated2:30PM Mon - Fri PSTtips, interior gripping surfaces, 2 1/2"FAX: (562) 860-0327The selection of planes includes Liepivot. One is straight, the other curved. http://www.superiorbalsa.com/Nielson and Stanley, plus some noBoth for 18.95. These are beautifule-mail: superiorbalsa@comcast.netname items made in England. Pricesstart at under 50 and go up to several and comfortable, and the color setsthem apart from others.Superior also handles tools, dowels,hundred dollars.epoxy, CA, bass wood, and carbonfiber, plus tools and other items. WeAny order from the catalog earns you a Precision steel ruler set - 6", 12", and18" long. Hardened stainless steel. One can’t praise them highly enough.discount on some specific item(s)I would NOT suggest giving any ofthese as presents to your spouse/friend and then borrowing them back.Possible exception is Paula Garwoodwho might really want to have thatnew Moto drill or set of clamps. Forthe rest of us, that’s a ploy that usuallybackfires so don’t go there!Page 8R/C Soaring Digest
Excellent balsa and exceptional service.Ryobi makes a motor tool that I likebetter than those made by Dremel. It’sWe also found a shop vac which worksheavier, but it’s more powerful andextremely well, is small (13L x 11W xhas ball bearings. The problem is I15H with built-in handle) and easy toDon’t forget the slopers!haven’t found a place to get the Ryobicarry around, plus is low in cost. It’stools repaired. Walking through thethe Stinger WD2000 by EmersonThe Weasel from Richter R/C is a great sandpaper aisle at K-Mart I saw theElectric. We picked up ours at Homelittle package and is cheap too! It’sBenchtop Pro Rotary Tool (SKUDepot. It’s got a two gallon capacitybeen in RCSD a couple of times but it07200078725, 24.96) that looked to meand is capable of wet or dry pick-up.is still a super recommendation, aslike a knock-off of my beloved Ryobi.The hose is four feet long and 1 1/4noted above.It comes with a small (25-piece)inch diameter, and it comes with a 1" xassortment of fittings, and takes the2" tubular attachments. Lots of other 1http://www.dream-flight.com/Dremel fittings. When I got it home1/4" attachments are available (creviceand tried it, the tool worked so welltool 6, wands 5, etc.) and these areThe new 60-inch foamy warbirds have and I liked it so much that I went backsmall enough to get into those tightstepped up the performance of foamthe next day to buy another to keep asplaces that are inaccessible to theand are durable to boot. Look for them a spare. Good tool; good price.conventional shop vac attachments. Itsoon at:has vacuum and blower connectorsK-Mart Neatand a replaceable filter (3/ 4). Nohttp://www.leadingedgegliders.com Inexpensive Clamp Setwheels, but the bottom of the canister(I had to get Paula her own set!)is shaped to slide easily
Page 6 R/C Soaring Digest Access hatch open. The spar system does not produce any obstruction and all servos are mounted in the wings. The relative size of Taborca is seen in this photo. The huge flaps are fully deflected in this photo. The sub fin drives the wing to a negative angle as soo
RC Soaring Digest is published using Adobe InDesign CS6 The May edition of RC Soaring Digest included information on the Działowski Bydgoszczanka, an early Polish sailplane. Our intent in presenting this information was, as always, that a reader (or perhaps several readers) will tackle the design, c
Page 2 R/C Soaring Digest ABOUT RCSD R/C Soaring Digest (RCSD) is a reader-written monthly publication for the R/C sailplane enthusiast and has been published since January, 1984. It is dedicated to sharing . these and I have a set of them on order. August 2003. R/C
Page 2 R/C Soaring Digest ABOUT RCSD R/C Soaring Digest (RCSD) is a reader-written monthly publication for the R/C sailplane enthusiast and has been published since January, 1984. It is dedicated to sharing technical and educational information. All material contributed must be exclusive and
December 2014 Monday December 1. Tuesday December 2. Wednesday December 3. Thursday December 4. Friday December 5. Saturday December 6. Sunday December 7. Monday December 8. Tuesday December 9 - Fall Semester Ends. Wednesday December 10- Reading Day. Thursday December 11- Final Examinatio
Mary Wolf—December 14 —December 6 Youth Birthdays Adelaide Bass—December 30 Addy Chytka—December 21 Nyabuay Diew—December 17 Quinn Feenstra—December 8 Blaine Fischer—December 21 Liam Fischer—December 22 Danielle Krontz—December 10 Hunter Lake—December 22 Hailey Lieber—December 15
Soundarya Central School The SoaringSoundarya Central School Falcon The Soaring Falcon A unit of Soundarya Educational Trust (Regd.) 25 years of Excellence About us Soundarya Central School (SCS) is a unit of Soundarya Educational Trust (SET). SET began its journey in education 24 years ago with an aim of providing quality education
Monitoring of migratory soaring birds in the East African-Eurasian flyway: a review and recommendations for future steps BEN JOBSON, TRIS ALLINSON, ROB SHELDON, WOUTER VANSTEELANT, EVAN BUECHLEY, STEFFEN OPPEL & VICTORIA R JONES Summary: Monitoring of migratory soaring birds at flyway bottlenecks is vital for informing
and STM32F103xx advanced ARM-based 32-bit MCUs Introduction This reference manual targets application developers. It provides complete information on how to use the low-, medium- and high-density STM32F101xx, STM32F102xx and STM32F103xx microcontroller memory and peripherals. The low-, medium- and high-density STM32F101xx, STM32F102xx and STM32F103xx will be referred to as STM32F10xxx .
