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Thread: FPV49 - Scratch built FPV KFm Airfoil

  1. #1

    Lightbulb FPV49 - Scratch built FPV KFm Airfoil

    Please go to Post #2 for English version

    Dette er en enkel oppskrift på hvordan man lager sin egen FPV "Zephyr wannabe" vinge fra scratch. Vingespennet er ca 49 tommer (lengden på en depron plate). Den flyr svært godt selv om det blåser friskt og lufta er rotete. Vinga løfter greit både GoPro og FPV utstyr++. Dette er flyene for dem som ønsker å ha noe man ikke er redd for å miste!




    Byggemateriale:

    - Depron (kan f.eks kjøpes på http://www.megaflis.no)
    - Pakketape (rema1000)
    - Ispinner! (eller bare kjøpe control horns plastic fantastic)
    - Karbonstenger (elefun.no/hobbyking)
    - UHU Por Lim (eller annen lim som ikke smelter/etser depron/elefun.no har)
    - Limpistol (ikke for varm)
    - Metallstreng
    - Borrelås

    Disse flygende vingene baserer seg på Kline–Fogleman vingeprofiler også kjent som KFm (Kline-Fogelman modified).

    En kan finne mer info om KFm her:
    https://en.wikipedia.org/wiki/Kline_Fogleman_airfoil
    http://www.rcgroups.com/forums/showthread.php?t=558321
    http://www.youtube.com/watch?v=A4oa-yagPp0&feature=plcp

    Intervju med Dick Kline oppfinneren og patent eigeren av KFm:
    http://www.youtube.com/watch?v=xj9zj0wBuVA&feature=plcp (delt opp i 4 youtube videoer)

    Sammenlignet med standard vingeprofiler kan disse se litt rare ut da vingen har steg og det ser ut som om deler av vingen rett og slett mangler. Når lufta passerer over vingen og går over steget dannes det en hvirvel med luft som sirkulerer bak dette steget. Denne hvirvelen fullfører vingeprofilen slik at den i praksis oppfører seg som en "standard" vinge når den er i lufta.

    Noen av fordelene med KFm vinger er at de er:

    - Enkle å lage med depron plater
    - Kan generere mye løft
    - Håndterer lave og høye hastigheter svært bra
    - Tåler vind svært bra
    - Fleksibel CG (FPV49 har CG ca 25 til 25,5cm fra tuppen og bak)
    - Trenger ikke være perfekt
    - Har ikke en stupbratt stall kurve som mange av "standard" airfoils har

    Aknepunktet til KFm er hovedsaklig drag og at den ser rar ut

    Inspirasjon til FPV49 hentet jeg fra Schraut5 og rctestflight.

    Så langt har jeg laget 3 versjoner av denne vingen. Alle versjonene bruker samme dimensjoner på plater (se vedlegg og plater merket ABCD):





    FPV49 versjon 1:



    "Den perfekte trainer!" Svært lett vinge som flyr ved lave hastigheter, slik at man får tid til å korrigere ved "brainfarts"

    Med et 4000mAh batteri + FPV utstyr og forsiktig bruk av throttle kan denne fly i evigheter.

    Med et mindre batteri (2650mAh) flyr den greit med FPV utstyr + GoPro, men den kan være utsatt for mikro vibrasjoner ved enkelte turtall.

    Vinge består av en 6mm depron plate med KFm-2 step laget av 2 stk 6mm depron plater. Karbon lister (feks: 1x4,5x1000mm fra elefun.no) brukes til å forsterke vingen. Vinge forsterkes med tape i front.

    http://youtu.be/J9LbspElRYU (Beste FPV video jeg har klart å fått til med denne. Man kan se en del mikro vibrasjoner i bildet)

    Bruk følgende plater for å bygge dette flyet:
    2x A
    1x C

    Motor/Prop:
    62gram 1300KV
    APC 8x6E - 20A/220W - 715gram skyv
    http://elefun.no/p/prod.aspx?v=16813

    ESC/BEC: 30A
    http://www.hobbyking.com/hobbyking/s...e_Series_.html

    Ferrite Rings:
    http://www.hobbyking.com/hobbyking/s...7x10_5pc_.html

    Servoer:
    2 stk 9 gram f.eks HTX900:
    http://www.hobbyking.com/hobbyking/s...cro_Servo.html

    Batteri: 3 cell (11.1V)

    Motor Brakett:
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    FPV49 versjon 2:
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    Denne vingen laget jeg med tanke på å fjerne microvibrasjonene jeg hadde på versjon 1. Denne vinga har samme KFm-2 step som versjon 1 (2x6mm), men selve hovedflaten på vinga er dobbelt så tykk og består av 2x 6mm depron. I tillegg er den ene depron platen forsterket ekstra ved hjelp av karbonstenger (6mm karbon rør), samt hele vinga er laminert med pakketape.

    Denne vingen blir dermed en del tyngre, men veldig solid. Den tåler nesten alt av juling, og har så og si ingen mikrovibrasjoner, men den må ha større motor og flyr fortere. Den staller når man flyr litt under 30km/t og maks hastighet jeg har fått den opp i er 109km/t med denne motoren.

    Jeg pleier å fly denne vinga med GoPro + 2650mAh batteri, men den tar GoPro + 4000mAh batteri helt greit.

    http://youtu.be/Ct8rOoIiKcM (maiden)
    http://youtu.be/vJVUsGEMKR0 (agile/fun)
    http://youtu.be/2ZpkF4lhdu4 (smooth)
    http://youtu.be/dHw4wzT6SHg (speed)
    http://youtu.be/KXzyXxsrjt4 (chasing FPV49v1)
    http://youtu.be/KiRzVo0dKYE (uncut FPV)

    Bruk følgende plater for å bygge dette flyet:
    2x A
    1x C
    1x D

    Prop: 9 x 6
    Motor: 1400KV / 88,3gram / 420W
    http://www.hobbyking.com/hobbyking/s...00kv_560w.html

    Alternativ motor for FPV49v3:
    http://www.hobbyking.com/hobbyking/s...dProduct=16092
    (eller noe i denne duren)

    ESC: 50(60)A
    http://www.hobbyking.com/hobbyking/s...0_60A_ESC.html

    UBEC:
    http://www.hobbyking.com/hobbyking/s...Reduction.html

    Ferrite Rings:
    http://www.hobbyking.com/hobbyking/s...7x10_5pc_.html

    Battery: 3cell (11.1V) 2650mAh (25-50C) (when using GoPro) // 4000mAh 3cell without GoPro

    Servoer:
    2 stk 9 gram f.eks HTX900:
    http://www.hobbyking.com/hobbyking/s...cro_Servo.html

    Motor Brakett:
    Kan bruke samme motor brakett som versjon 1, men bare 2 hull passer.

    FPV49 versjon 3:

    Etter inspill fra mr.Kline holder jeg nå på å bygge en KFm-4 versjon av FPV49. KFm-4 har en vingeprofil som er symetrisk, dvs top og bunn er helt lik. I følge Kline vil denne føles mer "on rails" enn KFm-2 og fly en del fortere. Gleder meg veldig til å prøve denne i praksis

    Har laget en video med tegninger dersom det skulle være noen andre som måtte ønske å bygge og teste denne vinga:


    Tegningene fra denne videoen kan brukes for alle vingene. Eneste forskjellen mellom de er hvilke/hvor mange plater man trenger og hvordan man setter dem sammen.

    For denne vinga skal man altså bruke:
    2x A
    2x B
    1x C
    1x D

    Og da var den ferdig!:



    Merk at disse vingene kan fly helt tullete i starten om man ikke får satt CG (Center of Gravity) og trim korrekt. Jeg flyr med begge elevons pekende bittelitt opp, den ene litt mer enn den andre for å countre torque fra prop.

    Bilder fra bygging av FPV49v3:

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    Elektronikk wiring diagram:
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    Hvordan få den i lufta:



    The next step:



    FPV49v3 with Undead MOD:



    Kommer til å oppdatere denne tråden fortløpende.
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    Last edited by FPVTrond; 20.July 2014 at 15:31. Reason: Lagt til info

  2. #2

    Default

    FPV49 build thread – English version

    The FPV49 is a scratch built RC deltawing designed to carry an on board live video system as well as an on board HD camera.
    FPV49 uses Kline-Fogleman airfoils also known as KF or KFm (modified) airfoils. Unlike traditional airfoils the KFm has one or more steps induced along the length of the wing. Behind the step a vortex is formed which becomes an adaptive part of the airfoil with low friction. The KFm will give the plane a very mild stall curve and in my experience dampen vibrations due to “un-clean air”. I, like many others have found that the KFm performs very well when flying in the wind. The biggest drawback in my experience is that there is some drag compared to “standard airfoils”. However in my opinion this is a small price to pay considering the stability of the adaptive airfoil.
    To learn more about the Kline-Fogleman airfoils please check out the following links:
    http://en.wikipedia.org/wiki/Kline%E...gleman_airfoil
    http://www.rcgroups.com/forums/showthread.php?t=1117276
    http://www.rcgroups.com/forums/showthread.php?t=1296458
    http://rcfoamfighters.com/blog/?cat=13
    http://www.youtube.com/watch?v=ROHE-YpV4Kk
    http://www.youtube.com/watch?v=6H-s7yuJcwk
    http://www.youtube.com/watch?feature...&v=A4oa-yagPp0
    http://www.youtube.com/watch?v=xj9zj0wBuVA&feature=plcp

    The plane design is heavily inspired by both Schraut5 and rctestflight. Compared to Schraut5’s FPV40 and rctestflight minizephyr the FPV49 has less sweep as one can see on the illustration.


    Since FPV49 is designed to carry FPV equipment it needs to have most of its payload in the nose section of the plane. Center of Gravity is about 24cm from the nose. If you fly with a tail heavy FPV49 you will have a hard time to control it, so put that weight in the nose.

    Technical Data:
    - Wingspan: approx. 49 inches
    - Weigh 1 to 2Kg (depending on your electronics)
    Plane Typical Building Material/Tools:
    - Depron foamboard (but most types of foam will work just fine)
    - Packing tape (tapebrothers.com)
    - Control Horns (or popsicle sticks etc)
    - 3x Carbon Strip (8mm ish recommended for main fuselage)
    - UHU Por glue or other foam friendly glue (woodglue works, but takes a long time to dry properly)
    - Hotglue! But be careful it can melt depron
    - Pushrods (or stiff metal string)
    - Velcro
    Optional material:
    - 2x Carbon strip (6mm ish for elevons) (you can drop this if you don’t plan to fly fast)
    - Battery bay made out of plywood or similar
    - Camera bay made out of plywood or similar
    - Coroplast for hatch/winglets

    Plans for FPV49v1, 2 & 3:




    Winglets Drawings:


    Lamination:
    I strongly propose to laminate your FPV49 with packing tape in order to reinforce the construction. Depron can easily break in a crash, but once depron is laminated with packing tape it is almost indestructible. Use the same method as Ed from Experimental Airlines to cover the plane.




    FPV49v1:
    This version is the first one I made in the FPV49 series. It is very light and flies really slow. It has a KFm-2 arifoil, but it could just as easy have a KFm-4 with one 6mm step at the top and bottom.
    Of all the planes I have tried this is the simplest one to fly since it is so slow. The drawback with this one is that it may flex a little due to it’s light/thin construction. If you are new to large wings this is the best one to start with. It is also very nice for Line Of Sight flying.
    With this plane I would recommend to make real large winglets to make it even more slow and steady 
    Use one C sheet and two A sheets.



    FPV49v2:
    This version is just like the FPV49v1 only with double thickness of the main body. The extra thickness makes the plane more solid and less open to vibrations and thus better suited for high quality areal video.
    Use one C sheet, one D sheet and two A sheets.

    FPV49v3:
    For advanced FPV fliers. I made this plane to take the FPV experience to the next level, it can be build light, but for my purposes I wanted a strong reinforced wing that could handle greater speed and give rock solid video. It is reinforced with more/thicker carbon spars or rods and uses plywood battery and camera bays to reinforce the plane and protect the equipment better. Because this is build for more speed it uses symmetrical KFm airfoils like KFm-4, but KFm-7 is also a good candidate for this wing. I use a bigger motor and ESC and load it up with two 3cell 2650mAh batteries.
    Use one C sheet, one D sheet, two B sheets and two A sheets.


    KFm-4 fluid simulation:


    FPV49v4:
    Oh yes it has been built and plans will be posted here as soon as I have perfected it!


    Electronics:
    I use one or two 3 cell batteries that power everything for all my setups. This is simple but the drawback may be that you have to put some effort into reducing noise from motor/esc so it doesn’t interfere with the video system.
    I normally place the video transmitter on one wingtip and the radio receiver on the other. Ferrite rings are used on cables going along the fuselage to reduce unwanted noise.
    Ferrite rings on control cable connected to the ESC is a must! Use ferrites on video cables as well.
    I normally use a separate UBEC to power the radio receiver instead of feeding it via the ESC. If you do the same you can cut the + and – cable from the ESC and only use the signal cable (white) between the rx and the ESC.

    Live video camera:
    I use a 600TLV Sony Super HAD II camera with 2.8mm lens.
    http://www.securitycamera2000.com/pr...-Menu-DNR.html

    To me the most important thing is not to have “realistic” colors in the live video, but rather to be able to see as much as possible due to safety reasons. The Super HAD II camera is very good for this purpose.
    I prefer a smaller lens like 2.8 to the 3.6 simply because 2.8 give a wider field of view. Flying with bigger lenses feels like flying while looking through a binocular to me.

    Proposal 1:
    Prop: 9x6
    Motor: 1400KV / 88,3gram / 420W
    http://www.hobbyking.com/hobbyking/s...00kv_560w.html

    Proposal 2:
    Prop: 9x6 / 10x6 / 11x6 ish
    NTM Prop Drive Series 35-42A 1250Kv 500W:
    http://www.hobbyking.com/hobbyking/s...dProduct=16092
    (or something like this)

    ESC: 50(60)A
    http://www.hobbyking.com/hobbyking/s...0_60A_ESC.html

    UBEC:
    http://www.hobbyking.com/hobbyking/s...Reduction.html

    Ferrite Rings:
    http://www.hobbyking.com/hobbyking/s...7x10_5pc_.html

    Battery: 3cell (11.1V) 2650mAh (25-50C) (when using GoPro) // 4000mAh 3cell without GoPro
    Servos:
    2 x 32 gram ie: DS329MG:
    http://www.hobbyking.com/hobbyking/s...32g_0_11s.html

    Electronic wiring diagram:

    Don’t want to ruin the plane on the first launch?
    Check out the How to launch the plane properly video:

    Do not side toss it like you would a lighter and smaller plane. You have been warned
    Some videos taken from FPV49

    http://www.youtube.com/watch?v=Utqm7Z6wR1M
    http://www.youtube.com/watch?v=-Nxs6Rj34zs
    http://www.youtube.com/watch?v=-qXV4EYQW9s
    http://www.youtube.com/watch?v=KX_HoVSB678
    http://www.youtube.com/watch?v=5Nx1alq2F-k

    If you have suggestions to improvement or alternative electronics please let me know

    The next step:



    FPV49 version 4 is here !

































    FPV49v3 with Undead MOD:


    - UNDER CONSTRUCTION -
    Last edited by FPVTrond; 20.July 2014 at 15:32.

  3. #3

    Default

    Kjempe flått!
    Føtt: 1984. Bor: Tromsø. RC utstyr: 9c super, Frsky 2.4 (Booster), DRAGONLINK FPV utstyr: Fatshark Attitude 5.8ghz og BEVRC/Lawmate 1.3ghz. FPV(Modeller): Skywalker X8, Tek sumo Z, TBS Disko, Zephyr II X 3, Skipper Youtube: Vazza69 TeamWhiteMoose

  4. #4

    Default

    Meget spennende denne modellen og flott arbeid du har gjort med å samle inn og sette sammen alt

    Har du noe tips til:

    -motor
    -esc
    -prop
    -servoer

    Og hvor mye koster den ca å bygge?

  5. #5

    Default

    Jeg har bygget og flydd noen slike vinger med slik airofoil funker bra stygg som Nøkken
    Fpv : tricopter og Z2
    Bosted : utforbi Haugesund
    Født 1979

  6. #6

    Default

    Hvordan har du sikret batteri og sånt på den?
    87mod

  7. #7

    Default

    Borrelås for batteri

    Borrelås + tape for ESC, BEC, VideoTx, RCRx

    Limpistol for Servoer & GoPro feste
    Limpistol + tape for FPV kamera

    Har enda til gode å miste noe av flyet enten jeg tar rolls eller flyr opp ned ^^

  8. #8

    Default

    Nice logg Trond.

  9. #9

    Default

    Ser spennende ut det der. Ser og utrolig lett ut å lage disse. Tror det må prøves en dag.. hehe
    Har vel ikke nå LOS film av flyet?

  10. #10

    Default

    Kjempe flott instruksjon FPVTrond
    En slik vinge må jeg nesten prøve og lage, hvordan fester du motoren (hvilket motor feste)? Bruker du noen spesielle metoder når du skjærer av "fronten" av vingen?
    Og hvor holder du (måler) når du skal finne cg?

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