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Thread: RVJET

  1. #1
    Pilot boopidoo's Avatar
    Join Date
    Feb 2011



    Rangevideo web shop: http://www.rangevideo.com/rvjet.html

    Latest manual: https://www.dropbox.com/s/mas62x5615...%20V2.pdf?dl=0

    General info
    For those that doesn't know what RVJET is, here's some information. The RVJET is a modular airframe designed specifically for use as an UAV or FPV platform. The model is designed to be easy to fly and easy to put together. It is very easy to transport and the interior of the box it comes in can be used as a transport case.

    The model can either be equipped with a nose gimbal for either gopro 1/2 (GP3 holder available separately) or CCTV mini camera or an EPO-nose. The model comes equipped with some spare nose domes which are very easy to remove using a bayonet mount.

    Much effort has been placed to reduce/remove reflections and distortion of the dome, both using design and product quality. All parts are available as spare parts. The model can have either a short wing (155cm) or a long wing (195cm). Based on how the user choose to attach the wings it can be very easy to change between short or long wings.

    NOTE: In the old manual there was a type regarding CG. The CG should be as on the picture where the fin meets the wing, not 20-25mm in front of this as stated in the example setup in the old manual.

    NOTE: It is recommended to glue the magnets horizontally (the manual states that you can also chose vertically but I do not recommend this).

    NOTE: New readers in this thread can skip the first twenty pages which mostly is a wait for the RVJET to be released: http://www.rcgroups.com/forums/showt...851413&page=22

    NOTE: In order to be able to replace the motor I recommend to use screws with flat (not tapered) allen heads. Used with a sperical/ball allen key it's very easy to remove the screws.

    NOTE: In the old RVJET replacing ESC could be tricky. To more easily remove the ESC after the fuse is glued I recommend enlarging the ESC pocket with a semi-circle towards the rear. This makes it very easy to remove and replace even quite large ESC. Do not cut deeper then the original ESC pocket. Also some foam can be removed in the front compartment to enable batteries being mounted sideways. This can make it considerable easier to achieve correct CG when using large batteries. See picture for reference: http://www.rcgroups.com/forums/showp...postcount=1365

    NOTE: The old manual only shows to glue the extensions to the wings. This both makes it difficult to place the long wings in the case and also makes it impossible to change between long and short wing configuration. My recommendation is to keep the wings and extensions separate. Make a wing joiner solution (see below) for both wings and extensions. That way you can choose depending on mood and mission which wing configuration that works best.

    NOTE (Rev14): The 2014 revision of the RVJET has some changes compared to the original 2012 version. One major change is segmented CF tubes. The tubes are no longer loose. See this post for reference on how the tubes should and could be installed: http://www.rcgroups.com/forums/showp...postcount=2619

    NOTE (Rev14): The RVJET rev 14 also has a lot of foam changes such as pre-molded pockets and cable channels. This post goes through and shows some pictures of the most prominent revisions. One of these is a shape on the bottom of the front compartment that is there to accommodate a battery mount plate. Information about that plate and dimensions etc is available in this post as well: http://www.rcgroups.com/forums/showp...postcount=2620

    Boopidoo build pictures
    I've posted some build pictures of my pre-production prototype. This model is nearly 100% identical to the production model. I built it with some tweaks such as cable channels embedded in the fuselage before I glued it together. I've also made embedded pockets and cable channels for RCRx and VTx.
    Wings: http://www.rcgroups.com/forums/showp...7&postcount=28
    Fuselage: http://www.rcgroups.com/forums/showp...8&postcount=29
    VTx and RCRx: http://www.rcgroups.com/forums/showp...8&postcount=30

    Wingjoiner solutions
    The absolute majority of the forces to hold the wings in place is done by the CF-tubes. However the user must decide how to hold the wings in place laterally, there's no major forces affecting in this direction but nontheless they need to be kept in place. Either they can be glued permanently or some kind of wing joiner can be used. This is some examples of how you can join the wing parts:
    • TAPE
      Many use tape which is (contrary to what many might think) a very durable solution. Tape is also used on high performance competition models so it is indeed durable as long as the tape used is of the correct type.
      Picture of a taped wing (wing+extension): http://www.rangevideo.com/media/cata...s/dsc00191.jpg
    • O-RING (Nylon screws)
      I've used this method on many models and the idea is very simple and durable. Just glue a nylon screw on each part and place an O-ring between them. The O-ring holds the parts together and is crash resistant since the bond is flexible.
      These pictures shows one way of doing it: http://www.rcgroups.com/forums/showp...6&postcount=31
    • O-RING (3d-printed wingjoiners)
      I've designed a somewhat nicer solution that uses a 3d-printed hook to be used instead of the nylon screw and doesn't need to be reinforced with plywood. I've also designed a cut template to help positioning the joiners and cutting the foam. Either download the STL-files and print for yourself or buy them from Shapeways. O-ring size approx 3/4" x 15/16". I've made some different designs, both the Dhook available from Shapeways as well as the 3DP-versions that are designed to be printed using hobby grade FDM-printers.
      Information and pictures: http://www.rcgroups.com/forums/showp...&postcount=497
      3DP wing joiner (FDM-printing): http://www.thingiverse.com/thing:170397
      D-hook wing joiner (single part): http://www.shapeways.com/model/93336...ner-dhook.html
      Cut template (single part): http://www.shapeways.com/model/93336...-template.html
      D-hook wing joiner (pack of eight): http://www.shapeways.com/model/99710...-dhook-x8.html
      Pictures of wingjoiners from shapeways: http://www.rcgroups.com/forums/showp...&postcount=929
      Drawing of the cut template: http://www.rcgroups.com/forums/showa...5&d=1370980819
      The wing parts can possible also be attached using strong magnets. I have not seen this being done but many ppl have talked about this method. I will update once it has been proven to be a functional solution.
      On other models I've seen people using friction to the CF-tubes to hold the wings in place. Sander Sassen used this on his Skywalker build and done right it does work very well. The CF-holes needs to be tapered to that it gets narrower toward the end. This method does require some force to join and break apart and after some use the hole can get too large. If this happens just pour some hot water win the hole which will make it narrower again.
      Pictures of ssassen's SW: http://www.rcgroups.com/forums/showp...postcount=8203
      One interesting method is to replace the servo connector with a locking connector that is glued in the wing. The connector is used both to connect the servo as well as to secore the wing. TinyXLR such as TA3F & TA3M work very well for this purpose. These are 3 poles but other variants exists, such as 5 poles (TA5F & TA5M).
      Pictures of my test install: http://www.rcgroups.com/forums/showp...postcount=2287

    Prop stopper
    A prop stopper was not included in the power package but it's super easy to DIY. Just follow these instructions: http://www.rcgroups.com/forums/showp...postcount=1187

    Replacing broken motor mount
    This is how I replaced the motor mount in 10 minutes: http://www.rcgroups.com/forums/showp...postcount=2267

    Rudder modification
    The fins of the RVJET is designed to be possible to modify with rudders, the fins protrude well enough behind the TE to accomodate this. The rudder servos can either be embedded in the wing or in the fin. Why rudders? Well with rudders it's possible to make coordinated turns that reduces the effects of so called "wagging" which can happen on flying wings. Rudders can also be mixed to be used as quite efficient airbrakes if both are rotated outwards. I've not yet tried this so I can give any recommended throws for rudder but my initial guess would be that rudders only need about 10mm throw in each direction. For airbrakes my guess is 45-60 degrees would be efficient. if the rudder throws is very large and a 12in prop is used there's a risk that the prop will hit the rudder.
    Video of an install with high throws and 12in prop:

    Modifyable airframe
    The way the RVJET is designed opens up for several variants, not only the two wing configurations it is shipped with. Here's some examples, none of which can be supported and as of yet they're untested. For example extra long wing with extra extensions or why not a twin airframe?
    CAD renders: http://www.rcgroups.com/forums/showp...&postcount=272
    Test mount: http://www.rcgroups.com/forums/showp...&postcount=462

    The RVJET can be launched in several ways. One of the is to use the integrated bungee hook in the skid. I've made a simple yet very effective bungee launcher using 8mm bungee chord and tent stakes.
    Pictures: http://www.rcgroups.com/forums/showp...&postcount=746
    Material list: http://www.rcgroups.com/forums/showp...&postcount=595
    Post with video of bungee take-off in FPV: http://www.rcgroups.com/forums/showp...&postcount=593

    3D-printed accessories:
    With 3d-printing it's easy to design and produce accessories for the RVJET. I have designed some parts and put them up for order and download on shapeways. I encourage others to post what you've designed as well. If it's good I'll put it up here as well.
    Pitot tube holder: https://www.shapeways.com/model/1359...s&materialId=6
    VTx and RCRx covers: https://www.shapeways.com/model/1359...s&materialId=6
    VTx and RCRx covers (ant interface): https://www.shapeways.com/model/1359...s&materialId=6
    Spinner cover (8 holes): https://www.shapeways.com/model/1972...s&materialId=6
    Spinner cover (16 holes): https://www.shapeways.com/model/1972...s&materialId=6

    OpenTX settings and files:
    Taranis model images: http://www.rcgroups.com/forums/showp...postcount=2511

    Other threads featuring the RVJET:
    picard10th's thread about the RVJET: http://www.rcgroups.com/forums/showthread.php?t=1883689
    The FPVLAB thread: http://fpvlab.com/forums/showthread....eo-Flying-wing
    rclab1's RVJET thread: http://www.rcgroups.com/forums/showthread.php?t=1683248
    rclab1's Tractor conversion thread: http://fpvlab.com/forums/showthread....you-guys-think
    Dennis's RVJET build log: http://fpvlab.com/forums/showthread....VJET-build-log

    Example installations:
    bobthenuke: P1
    deTonaTor_NZ: P1 P2

    Me and Kajakmannen talking about the RVJET-kit and explains some design concepts:

    Simon "boopidoo" talks in detail of RVJET Standard (short wing):

    Anders "kajakmannen" talks in detail of RVJET Extended (long wing):

    Flitetests review:
    Last edited by boopidoo; 22nd June 2015 at 04:26 PM.

  2. #2
    Pilot boopidoo's Avatar
    Join Date
    Feb 2011


    Last edited by boopidoo; 22nd June 2015 at 04:26 PM.

  3. #3
    Navigator parajared's Avatar
    Join Date
    Dec 2014
    Prescott, Az
    I have the Godiscover, does that make us mortal enemies?

  4. #4
    Pilot boopidoo's Avatar
    Join Date
    Feb 2011
    Why? I might feel sorry for you but we're definitely not enemies.

  5. #5
    Join Date
    Dec 2012
    Anyone interested I have a brand new full setup for sale plus lots of extras here: http://www.rcgroups.com/forums/showthread.php?t=2332759

  6. #6
    Navigator route81's Avatar
    Join Date
    Jul 2011
    Land of the famous Army Knife
    Ehm.... just pulled the trigger on one of these.......YYEEESSSS!!!


    "Even if this plane had a set of tits it wouldn't be any sexier." c5galaxy engineer about the Drak

    Zephyr I & II, MPX Twinstar II & Cularis, TBS Disco & Disco Pro, RVJET, Drak, MFD My Twin Dream, Strix Goblin is the next

  7. #7
    Join Date
    Apr 2013

    Cool Ready for maiden

    Performed the final "thrust-test" outside in the cold today. Some bad winter weather on the way from the north sea...Anyway, my bird are ready!

    Spec on my RvJet:
    ezUHF 8ch diversity tx
    RvOSD G6
    Lawmate 1.2Ghz 1000mW vtx
    Zippy 3S 8000mAh 30C battery
    Pixim Seawolf 690TVL camera in the dome.
    RvJet powerpack

    The EPO cone are mandatory when maiden this bird...or any bird with a dome
    Click image for larger version. 

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    When testing outside, the GPS are not getting any sat lock! Waited >10min...still searching sats.... That is NOT okay
    Last edited by rolf hult; 5th February 2015 at 12:52 PM. Reason: no sat lock from gps

  8. #8
    immersed from the start AtariJoe's Avatar
    Join Date
    Feb 2012
    Sat lock:
    1. make sure your GPS is working. Blue LED on, and no message "GPS diconnected" (in case of bad GPS cable/plug seating)
    2. 1,2 Lawmate 1000mW (!), man thats more power than needed, and if close to your GPS it can block you out.
    Try powering up with Vtx OFF, wait 3-5min, then check Sat lock. 1,2-1,3 interference can cause GPS problems with any system. You can avoid it by separation and shielding (and less Vtx power).

    Nice plane Rolf !
    -LOSers cry wolf when they see SHEEP
    -Why? ...because I can.

  9. #9
    Pilot boopidoo's Avatar
    Join Date
    Feb 2011
    Beautiful RVJET!

    Atarjoes suggestions are sound however I think your setup could work as is with some small changes in user procedure.

    As he suggested try to turn off vtx power until you get a GPS fix. Adjust HDOP for easier/faster fix. Relocate GPS away from interference from ESC etc.

    My RVOSD GPS units are often slow to lock to sats and this is often because the internal battery is dead forcing the GPS to always cold start. I think newer RVOSD fixed this though.

  10. #10
    Join Date
    Apr 2013
    The blue led is blinking, so the gps are ok. The cable are only ~15cm, but can try moving the puck outside the canopy on the wing...just behind the ezUHF.
    Would a lowpass filter on the vtx help?

    Btw, arranged the decals for id in norwegian colors...turned out to look like a french flag instead.
    Last edited by rolf hult; 5th February 2015 at 03:07 PM.

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