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Thread: Cupid Stunt's Super Skysurfer

  1. #1
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    Cupid Stunt's Super Skysurfer Bananahobby 2.4m

    Well it arrived
    I'll reserve a few posts for build and maiden
    For now let's just say "it's frikin' hooooooooge"

    Here's some pics that hopefully show that

















    Last edited by Cupid Stunt; 1st September 2012 at 02:07 AM.

  2. #2
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    Well what about the build ?

    OK, it was fairly straight forward really, instructions were fine even though they are in Chinglish

    All control horns and rods need to be fitted and adjusted which of course means setting up your radio and installing a receiver, no problem there as there's more than enough room, spoiled for choice as far as where to put anything really



    I opted to glue the tail sections in place even though the section are clearly molded to take a captive nut so you can screw it together, not hard to fit a nut glued to a small piece of ply if you wanted a removable tail section

    Fit and finish of the components is great and I'm happy to go with the standard electronics (servos, esc, motor)

    For the wings I had to cut two lengths of pine dowel (12mm) to slide down the wing tubes and act as stops for the spar, otherwise there's nothing to stop the spar sliding down the tube too far when assembling
    I personally wouldn't fly this without fixing the wings in place to stop them sliding off, for me I'm happy to just tape the wings on as my car can take a huge capacity due to it's width (three seats up front) and the fact the front centre seat folds down, but I suspect for most people this isn't a realistic option
    I'd suggest fixing two velcro straps to the fuse where the wings go in, cut a small recess in each wing half so the wings still slide on OK and fix matching velcro to the wing halves, this is something I may do later but for now it fits in my car anyway
    Doing the velcro would be no big deal, it took some time to eliminate other ideas and try to find the "perfect" solution and was a little frustrating to find that your really have to take a knife to this to get it to work how it should do out of the shop/factory
    Other than this the only mod I'd make is to cut the EPO hinges and use flat plastic hinges as well as tape, that's not something I normally do but it only took a very slight knock to rip one of my flap hinges before the plane had even been in the air

    Already touched on the room in there but let's expand on that a little...
    I flew it's maiden with a 5000mah 3S in the nose, OSD etc could easily fit on the flat ledge under the wings making it accesible from under the canopy or when the wings are removed, that leaves a fairly large unused area directly under the canopy, the servos are slight to the rear of that and set into the sides, you could easily fit a second 5000mah 3S in there, in fact if you moved the servos rearward to balance the weight along with mounting your VTX on the tail boom then you could have 2 x 3000mah 3S in the nose section and another 2 x 3000mah 3S below the canopy, that's 12,000 mah in total, you might want to upgrade the motor, esc and prop though



    The plane will accommodate a 9 inch prop easily but I believe that may be too much for the standard 40a esc and motor, though an 8x8 prop may give it a little more punch
    Let's face it this is no aerobatic pole racer, that's not what it's designed for, what it does do is spread a load over a huge set of wings, you can either use that to carry heavy gear or use it to float for all eternity without hardly using the throttle
    Last edited by Cupid Stunt; 26th August 2012 at 04:54 AM.

  3. #3
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    Maiden Pictures

    Well the day was quite windy averaging over 15mph and frequent gusts to around 24mph, the wind was funny though as when I self hand launched the Skysurfer just went straight upwards above my head about 50ft then I'd panic and have to get the throttle on to get it out in front of me so I could see it's orientation , suffice to say that in an avg 15mph wind bog standard with a 5000mah 3S battery it floats very well, I may tweak the CG back a tiny bit as it seems to drop the nose when the wind dropped but before doping that I need to fly it in calm conditions to get a real feel for it





















    CoG and battery
    I used a 5000mah 3S battery which fitted beautifully snug into the nose compartment and as a bonus it also put the CoG at exactly 100mm from the leading edge (right over the main spar)
    After having flown the plane now I may well move the CoG back a little as I just felt it may have been a tiny bit nose heavy but I'll reserve judgement until I've flown it in calmer weather
    No point in trying to ascertain power consumption yet either as it was so windy over the slopes I didn't need throttle at all so could have stayed aloft for hours, I only used throttle when I just fancied doing so to move faster from one spot to another, I suspect though with prudent use of the throttle and a 5000mah 3S you'd get an hour of flight, if you was a competent glider/soarer then you'd get hours as there's definitely no lack of lift on this big birdy
    ================================================== ==========================================

    Videos

    Quite funny really as it wasn't exactly ideal conditions for a maiden, with gusts to 24mph and an average of 15mph it didn't allow me to asses hwo she'd fly in normal conditions, no point in trying to trim the plane or guage CG properly or even battery usage as most of the time she was just floating on the wind with no power required
    The first launch I got Richard to throw her up whilst I piloted just to be safe so I could catch here with the controls if she wasn't quite right, on later launches I wanted to see how difficult she was to self launch one handed, no trouble other than the wind taking her straight up above my head making it really hard to get orientation and forcing me to power on to get her out in front of me

    Hat Cam Footage:



    Compact Cam Footage





    How does she fly ?
    Well unsurprisingly she flies like a rather large (read humungous) Skysurfer, a bit more daunting especially if you're not used to large planes, power wise she's adequate, load wise she'd take a ton but you'd want to upgrade the power set, for me I'll keep her light as possible using a Pixim Seawolf and a Horyzon HD cam along with my RVOSD, she soars nicely and glides great too, just about everything I wanted a large FPV plane to be really (build niggles aside)
    Last edited by Cupid Stunt; 27th August 2012 at 05:18 PM.

  4. #4
    RDWHAH bgarber's Avatar
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    It's a little bigger, eh? Can't wait to hear how she flies... I'd imagine with all that available space FPV equipment would hardly make a dent in the flight dynamics. Maybe that's what I need to fix my CG and launch issues!!!

    You could probably ride on it and have a true FPV experience!!!

  5. #5
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    Quote Originally Posted by bgarber View Post

    You could probably ride on it and have a true FPV experience!!!
    No, I have my 3500mm Reichard Blizzard glider for that

  6. #6
    I can't breathe Hans's Avatar
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    Man, that is big. Thanks for posting these pictures

    You should get some Viagra sponsorstickers

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    Thanks Cupid!
    Now I finally get a real feel for how big it is. If you have the two out for more photos, would you take one comparing the cockpits?
    What are your thoughts on the quality and "feel" of it?
    I was worried when the first flight report on RCG was Blaser's catastrophic crash with no apparent explanation.
    Best of luck on your maiden flight.
    We can't wait to see more pics and video.
    Happy landings.

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    Quality seems great, just a few oddities...
    There is provision in the molding of the tail sections for it to all screw together yet there are no fittings to do so and the instructions say to glue it

    Big disappointment here, the statement they made about it having nylon locking pegs to hold the wings on is false, in fact like it's smaller sibling there is nothing to stop the wings sliding off the spars apart from friction and a very slight wedge shape piece of foam, so it's back to all figuring our own way to secure the wings, I glued them on my 1400mm Skysurfer but that's not practical on a 2400mm plane even if my car can take that

    Yet to figure out the flap servos as they've mounted them mirror image of each other like the ailerons, so it may be that they have internally reversed one of the servos or it may be that they will require a channel for each flap (not great for FPV as we need all the channels we can get), either way it wouldn't be too difficult to remove and turn one of the flap servos

    I was hoping to put a camera in where the pilot figure is but the canopy clear covering is far too murky and distorted to do that

  9. #9
    RDWHAH bgarber's Avatar
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    Are you planning on mounting your FPV electronics on the exterior or is there enough room to mount everything from the canopy opening? I had to cut out a belly hatch (as per Tim's instructions on RMRC) in order to fit the electronics in my Sky Surfer v1.

  10. #10
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    Quote Originally Posted by bgarber View Post
    Are you planning on mounting your FPV electronics on the exterior or is there enough room to mount everything from the canopy opening? I had to cut out a belly hatch (as per Tim's instructions on RMRC) in order to fit the electronics in my Sky Surfer v1.
    You'll have no such trouble with this monster, there's stack loads of room, conveniently there's a nice large flat ledge right under the wings, easily accessible where I plane to put my RVOSD, with the OSD there, there will be loads of room for batteries

    I'll get internal shots as I build it over the next 24 hours, though I won't fit the FPV gear immediately as I like to test planes out LOS and standard first, I will place items inside temporarily for pics though

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