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%&LElectric Motor Sizing (Left click your mouse to advance to the next slide) ,M(4f(5Rob Kallok Jersey Coast Sport Fliers 14-December-2005Motor Sizing Rule of ThumbPower Requirements: Trainer  50 W/lb Mildly Aerobatic  70 W/lb Hot Aerobatic  100 W/lb 3D  150+ W/lb NOTE: power figures assume actual battery output, not power at prop. Takes into consideration drivetrain losses (approx. 15%):U~U~ Electrification ExampleExample: U-Can-Do 3D .46 Approx. Airframe weight: 4lbs Wing Area: 904 in2 Target Performance  Hot Aerobatic (100 W/lb)<_/. Motor Selection?8For  hot performance we need to guestimate the amount of power required, assuming an AUW including motor and battery. To keep things simple we ll use an AXI outrunner motor with LiPoly cells. To start the process we ll estimate a motor/battery package of 2 lbs, for an AUW of 6 lbs.>! s  d Motor SelectionNAssuming an AUW of 6lbs and a need of 100W/lb, we need a motor/battery combo capable of delivering 600W. NOTE: this is at the battery. The power at the prop will be some percentage less. Looking at available AXI motors, we find the 4120-14 with a 12x8 prop, using a 5S (five cells in series) LiPoly pack will consume 686W @ 9600 RPM. TiZRZZiR$%AXI 4120-14 Specs  U-Can-Do All Up WeightAUW: Airframe: 4lbs AXI 4130-14: 11oz. Jeti 70A Controller: 1oz. Thunderpower 5S3P battery: 22oz. Total: 6lbs 2oz (98oz) Power/Weight: 112W/lb!!! \tt 2 ,' F U-Can-Do SpecsElectric Figures: AUW: approx. 6lbs Wing loading: 15oz/ft2 Battery Cap: 6AH Max current: 42A Est. Flight Time (via MotoCalc): 9min (full throttle) 17min (3/4 throttle)VZmZ*Z'D*s. iGlow Figures: AUW: approx. 5lbs. Wing loading: 13oz/ft2 Estimated Flight Time (assuming 8oz. tank): 10min&\\Electrification Comments_While electrics previously had to be purpose-built for electric power to keep weight down, with the new high power/low weight drivetrains even ARFs are good electric candidates. Geared motors are also an option in this application. Depending upon gear ratios many different prop options are available depending upon the desired flight characteristics.`Z`,~ Brushless Motor ConstantsKV (Motor Constant) Specifies the number of RPM the motor will turn per volt. Important when determining size of prop vs. number of cells. Higher cell count equals higher RPM. May need to reduce prop size to stay within max power limits. Example: AXI 4130-16 has a KV of 385 RPM/V.fZZ Brushless Motor Constants>RA (Motor Resistance) Specifies the internal resistance of the motor. RA is a function of the number of windings within the motor and the size of the wire (gauge). RA has a bearing on the overall power handling ability of the motor. A motor s maximum current limit is based on the resistance of the motor, which is a function of the wire size (and windings). Example: AXI 4130-16 has an RA of 63 mohms (.063 ohms).ZZ 1 ]    Brushless Motor ConstantsIO (No-Load Current) IO is the amount of current a particular motor will consume without any load on the motor. IO is typically measured at a voltage of 10V. Example: AXI 4130-16 has a IO of 1.3AzZH  "Where to go next& I strongly recommend purchasing electric motor simulation software. I ve have very good luck with MotoCalc (~ $35). Buy a digital scale. It s very helpful when building to get an accurate AUW for your airplane. Buy a WattMeter or one of the new setups from Medusa. Medusa offers a computer-driven test cell for a very reasonable price.PP,bo nResource MaterialElectric motor tutorial on Ezone part 1: http://www.rcgroups.com/links/index.php?id=3385 part 2: http://www.rcgroups.com/links/index.php?id=3389 part 3: http://www.rcgroups.com/links/index.php?id=3393 part 4: http://www.rcgroups.com/links/index.php?id=3398 part 5: http://www.rcgroups.com/links/index.php?id=3402 part 6: http://www.rcgroups.com/links/index.php?id=3597 MotoCalc www.motocalc.com Download a free 30-day evaluation copy. Highly recommended!^!Q M!Q M   # # # # # #= 0)X 0b 0 0 0 9 0Bq 0{ Resource MaterialsPower Meters AstroFlight WattMeter (www.nesail.com) Medusa Power Cell (www.medusaproducts.com) Motor Manufacturer Websites Model Motors (AXI) (http://www.modelmotors.cz) Hacker (http://www.hackerbrushless.com) Aveox (www.aveox.com) Neu Motors (http://www.neumotors.com) V R R    2     0$2  0G]  0  0  0 0  Resource MaterialsMotor Vendors: Hobby Lobby (www.hobby-lobby.com) Northeast Sailplane (www.nesail.com) Atlanta Hobby (www.atlantahobby.com) Esprit Model (www.espritmodel.com) Forums: Ezone (www.ezonemag.com) RC Universe (www.rcuniverse.com) VZZZ<Z< z  0/ 0FT 0ey 0 0 0,  0` @EoOV` @Eff؂o` MMMwww` 33f3Ƨgzf` 3ffE` JH3f̙ff` 33̙fRP` =bf>?" dd@,?wnd@ n< w_@nA``< n?" dd@   @@``PP   @ ` ` p>> ''0CC >'(   !T    "b   # " \    "B   HDA "B   HDA "B   HDA "@@B   HDA "B   HDA "B   HDA "B   HDA "@@B   HDA "B   HDA "B   HDA "B   HDA "@@B   HDA "  B   HDA "  B   HDA "  B   HDA "@ @ B   HDA "  B   HDA "  B   HDA "  B   HDA "@@B   HDA "B   HDA "B   HDA "z\    "B   HDA "B   HDA "B   HDA "@@B   HDA "B   HDA "B !  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"Systemk-@Tahoma-. fU2 04(Left click your mouse to advance to the next slide).-@Tahoma-. @E2 B Rob Kallok.-@Tahoma-. @E-2 LJersey Coast Sport Fliers.-@Tahoma-. @E 2 W14.-@Tahoma-. @E 2 W-m.-@Tahoma-. @E2 WDecember.-@Tahoma-. @E 2 W>-m.-@Tahoma-. @E 2 WA2005.-՜.+,D՜.+,     +On-screen Show AT&T Labsr<v Times New RomanTahoma WingdingsArial BlueprintMElectric Motor Sizing (Left click your mouse to advance to the next slide) Motor Sizing Rule of ThumbElectrification ExampleMotor Selection?Motor SelectionAXI 4120-14 SpecsU-Can-Do All Up WeightU-Can-Do SpecsElectrification CommentsBrushless Motor ConstantsBrushless Motor ConstantsBrushless Motor ConstantsWhere to go nextResource MaterialResource MaterialsResource Materials  Fonts UsedDesign Template Slide Titles,  8@ _PID_HLINKSAr0http://www.rcgroups.com/links/index.php?id=33850http://www.rcgroups.com/links/index.php?id=33890http://www.rcgroups.com/links/index.php?id=33930http://www.rcgroups.com/links/index.php?id=33980http://www.rcgroups.com/links/index.php?id=34020http://www.rcgroups.com/links/index.php?id=3597http://www.motocalc.com/http://www.nesail.com/http://www.medusaproducts.com/http://www.modelmotors.cz/ http://www.hackerbrushless.com/http://www.aveox.com/http://www.neumotors.com/http://www.hobby-lobby.com/http://www.nesail.com/http://www.atlantahobby.com/http://www.espritmodel.com/http://www.ezonemag.com/http://www.rcuniverse.com/%_ 0AdministratorAdministrator  !"#$%&'()*+,-./012345679:;<=>?@ABCDEFGHIJKLMNOPQRSTUVWXYZ[\]^_`abcdefghijklmnopqrstuvwxyz{|}~Root EntrydO)PicturesToCurrent UserSummaryInformation(6PowerPoint Document(8DocumentSummaryInformation8