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  1. #1
    seanreit's Avatar
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    Maiden done on Rookie II dual axis thrust

    With the Merlin on board, this airplane shot off the ground and climbed in a hurry. First flight, I didn't try to bend anything but did a few loops and a couple of rolls. Tracked very nicely.

    I have a gyro on each axis of the thrust vector. Wasn't sure how well that was keeping the airplane on track, I'll explore the "3d" capabilities on later flights.

    The manufacturer indicates that you can deflect the canards to 80 degrees and turn the mix off as a landing speed brake.

    I designed mine this way, and I'm not sure, but I may be putting in a speed brake in addition, with the residual thrust of the merlin, I think I'm gonna need it as the first landing attempt blew right by me.

    My nose gear had tangled in the pull pull system even though I'd tested it only about 50 times and put a zip tie on it. [:@]

    So I set it down as gently as I could in the grass. Broke an axle and one ply mount. Will have it ready for round two in a few days.

    I did play with the thrust vectoring. It is very effective!

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  2. #2
    jetflyer's Avatar
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    RE: Maiden done on Rookie II dual axis thrust

    Looks good Sean!
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  3. #3
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    RE: Maiden done on Rookie II dual axis thrust


    ORIGINAL: seanreit
    My nose gear had tangled in the pull pull system even though I'd tested it only about 50 times and put a zip tie on it. [:@]
    Hello Sean.

    Congratulations on the maiden. The sceme you choose is my favorite as well.

    I noticed that the pull/pull wires are crossed. Why?
    It only hurts when I laugh......
    Stig Andersen/Danish Jet Dude

  4. #4
    seanreit's Avatar
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    RE: Maiden done on Rookie II dual axis thrust

    Rudder, vector in the yaw, and steering servo are all being run off the same channel. I need to put a reversed servo in there to solve it for good.

  5. #5
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    RE: Maiden done on Rookie II dual axis thrust

    Looking good Sean, congrats. But I didnΒ΄t understood very well, you didnΒ΄t installed the belly speed brake? I presume that the manufacturer recommends the canard at 80 degrees only when the wheels are on ground, or the instructions say the opposite?

    About the nose wheel steering you didnΒ΄t need a reverse servo at all, you can put it upside down in the tray.. itΒ΄s not hard to work with it in this position.


    Enrique

  6. #6
    seanreit's Avatar
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    RE: Maiden done on Rookie II dual axis thrust

    DIdn't think about putting the servo in upside down, great idea.

    I'm thinking about putting a matchbox on it so I can trim the steering on the matchbox and trim the vectord thrust in yaw on the dial on the radio.

    The matchbox of course will also reverse the servo, and I have a spare one as well anyway.

    They call for 80 degree deflected canard in the air on setup for landing.

    I held my breath and hit the switch yesterday. The airplane flared up and then settled down into flight much like dropping flaps on any other airplane. It just wasn't enough to overcome the residula thrust of the merlin. I'm gonna try it a couple more times but will likely put the speed brake in.

  7. #7
    HAMMERDOWN's Avatar
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    RE: Maiden done on Rookie II dual axis thrust

    I run my servo upside down also. Just slip the servo in with the arm and cables attached and screw it down. The cables will have less of an angle also. A better way to go.

  8. #8
    seanreit's Avatar
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    RE: Maiden done on Rookie II dual axis thrust

    FYI, the canard mix when you hit 80 degree deflection button, it releases the control of the canard, so it just sits there at 80 degrees and you drive it home on elevons.

  9. #9
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    RE: Maiden done on Rookie II dual axis thrust

    Hi Sean,

    Looking good man. If they fly as good as in the simulator, youwill have a blast!!

    One question though, do you have a spare channel on your Rx? You could mix the stering wheel to the rudder on say AUX3, and use the knob on the radio for independent trim. Works for me.
    Im not a big fan of using servo reveresers myself.

    David
    Buying Jet Legend? Read here: http://www.rcuniverse.com/forum/m_11372496/mpage_1/key_/tm.htm

  10. #10
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    RE: Maiden done on Rookie II dual axis thrust

    Hi Sean, nice looking airplane, I have been thinking about one of these with a Jet Central Falcon. I thought one of my flying buddies had lost his marbles when he installed a Merlin in a Mk.1 Rookie !! I think he is flying it using 100krpm....bit of a waste of a Merlin but each to his own I suppose.

    I would like to see one of these hover with gyro assistance on all 3 axis. I thought about ducting some case pressure to each wing tip for hovering roll control, the Merlin would certainly have plenty to spare.

    One thing I have been curious about for some time is why some people use matchbox's or have to orientate servo's differently to get a specific control movement ? Is it not simpler to tell each servo it's function, which direction and amount of movement ? Or am I missing something ?

    Rob.
    UK distributor: Jets Munt Merlin 90, 140 & 160. Jet Central UK. FADEC ECU\'\'\'\'s UK

  11. #11
    seanreit's Avatar
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    RE: Maiden done on Rookie II dual axis thrust

    ORIGINAL: FalconWings
    You could mix the stering wheel to the rudder on say AUX3, and use the knob on the radio for independent trim.

    David
    I've got the steering servo plugged into a y on the gyro. The gyro Y connects the steering servo and the thrust vector (yaw) into channel AUX 4 on the 10x. Aux 4 is mixed to Rudder.

    If I didn't want the steering on a gyro, I could put it on Aux 5, but I'm not there yet.

    One thing I don't particularly like is having the thrust vector on a half speed channel (aux four or aux five).

    Here is my layout, I'm open to suggestions:

    1 throttle
    2 elevon left
    3 elevon right
    4 rudder
    5 gear
    6 canard
    7 thrust vector pitch through a gyro
    8 brakes
    9 steering and thrust vector yaw through a gyro
    10 just a voltage indicator, can be anything here.

    Now that I'm thinking about it, I could put thrust vector yaw on channel 8 and move the brakes to aux 5. I'm using the snap roll button anyway. I think I'm gonna do that. I'll have to put in another gyro, but that's worth it.

  12. #12
    seanreit's Avatar
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    RE: Maiden done on Rookie II dual axis thrust

    ORIGINAL: Robrow

    Hi Sean, nice looking airplane, I have been thinking about one of these with a Jet Central Falcon. I thought one of my flying buddies had lost his marbles when he installed a Merlin in a Rookie !! I think he is flying it using 100krpm....bit of a waste of a Merlin but each to his own I suppose.

    I would like to see one of these hover with gyro assistance on all 3 axis. I thought about ducting some case pressure to each wing tip for hovering roll control, the Merlin would certainly have plenty to spare.

    One thing I have been curious about for some time is why some people use matchbox's or have to orientate servo's differently to get a specific control movement ? Is it not simpler to tell each servo it's function, which direction and amount of movement ? Or am I missing something ?

    Rob.
    Rob, what might work on Roll is a computer fan (say 4") glued in teh wing that works off a gyro and a battery and escs. THat's the only thing I could come up with. But whose gonna tear up a wing working it out, know what I mean?

    Eddie Weeks proved that helicopter tail rotors on electric motors could stabilize the rig. But that won't work on the rookie. Needs to be flatt and inside the wing in my opinion.

    If someone can tell me what willwork, I'll install it.

    I don't turn down my engines, that is for wussies!

  13. #13
    seanreit's Avatar
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    RE: Maiden done on Rookie II dual axis thrust

    ORIGINAL: Robrow

    Is it not simpler to tell each servo it's function, which direction and amount of movement ? Or am I missing something ?

    Rob.
    IF Jr made a box that would do that, I would buy it. So far as I know you can only do that with Hitec.


  14. #14
    Robrow's Avatar
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    RE: Maiden done on Rookie II dual axis thrust

    The case pressure idea should work, particularly at the higher rpm in the hover. A good friend of mine ran compressor outlet pressure down a 10mm bore flexy pipe..it was like an angry cobra..certainly enough force to do the job I think.

    I think in the hover it would take very little force to roll...no gravity to overcome. I don't think the wing would need to be chopped up much to run some 10mm festo tubing down. 2 opposing nozzles in either wingtip and a simple 3 position variable flow valve in the fuz, centre position... no flow, then flow to opposing nozzles in either tip at either extreme of roll command.

    A test rig could even be built to prove or disprove the basic idea.

    Or am I just daydreaming again

    Rob.
    UK distributor: Jets Munt Merlin 90, 140 & 160. Jet Central UK. FADEC ECU\'\'\'\'s UK

  15. #15
    seanreit's Avatar
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    RE: Maiden done on Rookie II dual axis thrust

    You find me the parts a specific list of items available in the US and I will buy them and test it.

    I'll also need specific instructions on how to properly tap the case and where.

    I'll also need rough estimates on what temperatures are expected coming down that tube. Insulation in the wing may be necessary as it is composite.

  16. #16
    seanreit's Avatar
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    RE: Maiden done on Rookie II dual axis thrust

    Does anyone know the temperature of the air that is in the propane line during the run of the engine? I was thinking about T'ing off that line and running it to my wheel brakes as a constant source of wheel brake pressure.

  17. #17
    Robrow's Avatar
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    RE: Maiden done on Rookie II dual axis thrust

    OK, I'll get back to you on the specifics. The air I am talking about is compressor outlet from a similar position to an air start nipple so is relatively cool and should not need any special heat protection measures. The downside is warranty validity []

    If there is any residual propane/butane mix in the gas line it will not do the brake 'o' rings any good.

    Rob.
    UK distributor: Jets Munt Merlin 90, 140 & 160. Jet Central UK. FADEC ECU\'\'\'\'s UK

  18. #18
    George's Avatar
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    RE: Maiden done on Rookie II dual axis thrust

    I see you you already experienced the "burn through" from your AMT thread.

    George

  19. #19
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    RE: Maiden done on Rookie II dual axis thrust


    ORIGINAL: seanreit

    ORIGINAL: Robrow

    Is it not simpler to tell each servo it's function, which direction and amount of movement ? Or am I missing something ?

    Rob.
    IF Jr made a box that would do that, I would buy it. So far as I know you can only do that with Hitec.

    Robrow, sounds like you have a Multiplex radio. I just bought an Evo and I think I'll be selling my Hitec programmer
    Sean, with Multiplex you can calibrate each servo separately no matter what channel its on and no need for a "Y".
    Mark P
    An Expert has made every mistake - A Master has made every mistake twice

  20. #20

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    RE: Maiden done on Rookie II dual axis thrust

    How do you avoid RF interference from the metal to metal contact?

    Good luck looks neat


    Stallman

  21. #21

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    RE: Maiden done on Rookie II dual axis thrust

    I have a rookie 2 I have ben working on flat spins would like to talk to you about 3D /Terry thank you 304-768-3469


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