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  1. #326
    Carsten Groen's Avatar
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    RE: Its Bobcat nice

    Auch Terry,

    it is a 11x8 I have

    When I try to press on the end of the booms (just at the rudders) I need to apply much pressure to raise the front wheel, thats probably why it sticks to the ground. I also see the bumping when taking off, makes it a "bit" hairy....

    I completely removed the stock (rear) gears, and put on a alu "bracket" type of gear, used the 4 bolt holes for the engine. I moved it to the front two holes then, this helped a little with the roll, but not near enough. I think I need to move the rear wheels 2" more forward. I'm just afraid that there is nothing in the fuse to put the bolts into at that point....

    Regards,
    Carsten
    Carsten Groen

  2. #327

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    RE: Its Bobcat nice

    Carsten,

    It doesn't matter where your wheels are if the plane is set nose high on the gear. If your CG is set per the "revised" instructions, just make the nose a bit higher and the plane should rotate smoothly. The good news is since this is a pusher you can simply hold full up on the entire roll out as long as you remember to relax the elevator as soon as it breaks ground.

  3. #328
    Carsten Groen's Avatar
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    RE: Its Bobcat nice

    Mark,

    I just moved the wheels 1" further forward, and changed the thrustline a little (moved 4 mm spacer to the "rear" screws on the engine (rear as seen on the plane, that would make them sit near the prop)

    My plane is just a little nose high, how much "is ok" ?

    Carsten
    Carsten Groen

  4. #329

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    RE: Its Bobcat nice

    Mine is approx. 10 degrees. If you set it on a table and the nose is obviously high, it is good enough. Once again your large prop may wind up being the cause of the problems. I am using a 10" and I plan to drop down to a 9".

    Mark

  5. #330
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    RE: Its Bobcat nice

    I'm using an APC 11x6 and I haven't noticed any pitching when I reduce throttle but I've only flown it three times and the second flight was full throttle from start to finish since my throttle barrel locked up at wide open and I had to fly until it ran out of fuel. [X(]

    I'm running the Tower 75 and I made aluminum blocks for motor mounts and they are perfectly even so I have only the thrust that was built into the frame. I'm maybe 1/8" higher than stock. Well, Maybe 1/4" when you figure the engine is a bit larger diameter as well. I have to fix the landing gear before I can fly it again. I tore the blocks out on the last landing. It was 6" off the ground when it ran out of air speed while landing. If I can get it fixed before the weekend, I'll do some low passes and reduce throttle to see if I have that problem.

    Blessings, Terry
    Live simply. Love generously. Care deeply.
    Speak kindly. Leave the rest to God

  6. #331
    Carsten Groen's Avatar
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    RE: Its Bobcat nice

    Great Terry !

    I'll try my "new setup" tomorrow at the field (weather and work permitting ) and post the results
    Do you use the 11x6 on an OS61 ? (seems like a small prop ?)

    Carsten
    Carsten Groen

  7. #332
    still4given's Avatar
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    RE: Its Bobcat nice

    Hi Carsten,

    No, I am running the 11x6 on a Tower 75. Yes it is a bit small but we are so limited with pusher props. The engine is turning about 15,500 on the ground. That is OK with the this engine as it is an RPM engine. I think it is rated at 17,000 peak. I just received a couple Graupner 11x8 pushers so that is what I will be trying on the next flight.

    I'm looking forward to your results.

    Blessings, Terry
    Live simply. Love generously. Care deeply.
    Speak kindly. Leave the rest to God

  8. #333
    Carsten Groen's Avatar
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    RE: Its Bobcat nice

    Just came back from the flying field!
    The "drop" of the nose when removing throttle did not change (maybe it did, but then it was so little I did not notice it !)
    The change of the landing gear helped a little on rollout, but the biggest help is to keep a little down elevator while it builds up speed on the runway, and then lift it off. WIll try again tomorrow (I'm not _that_ shaky anymore when flying it )

    Regards,
    Carsten
    Carsten Groen

  9. #334

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    RE: Its Bobcat nice

    [8D] Hello Gents!!! Does anyone have any information on flying the Falcon 120 with a 1.30 Nitro Engine???
    I would like to know what size prop to go with... Also 2 or 3 bladed???
    Thank You,
    Mojo

  10. #335
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    RE: Its Bobcat nice

    thrustline offset above the fuselage can cause those problems for sure. recommend you bring er back down stock value, with about 8 degrees downthrust. most of the thrust is at the tips of the prop anyway. You are forcing downpressure on the nose during takeoff. and you are haveing hi velocity air over the tail. bad combo.
    Goose
    Wren Turbines USA, Fromeco Avionics, JetiUSA Flight Team, www.Espritmodel.com www.demonaero.com

  11. #336
    gooseF22's Avatar
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    RE: Its Bobcat nice

    Nitro, I saw posts that the GMS 120 wouldn't push it. You may not be satisfied either with the 1.30, I think there areonly

    There are not many to choose from . Im not sure, if it can handle the rpm maybe a 14x8 zinger, or 14x6 APC. the next one up is a 16x10 mairscrew 3 blade. Im seeing 1.60's on it.

    good luck. do a google search on pusher props, there are not many to choose from.

    g
    Goose
    Wren Turbines USA, Fromeco Avionics, JetiUSA Flight Team, www.Espritmodel.com www.demonaero.com

  12. #337

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    RE: Its Bobcat nice

    For the Falcon 120 ........... put a Byron fan on it with a OS .91 0r Rossi
    with 4-1/4 talicone.It will do a loop from level flight and take off is under 100 feet. And the C/G is perfect where it is. I have 10 flights on it and its getting better each time.
    If something fails,try and try again until you get it right.

  13. #338

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    RE: Its Bobcat nice

    Hello Gents!!! Can someone measure the width between the 2 Booms please and give the distance from the engine mount to the ground... I am still away from my plane and I would like to continue to round up all the parts necessary to complete it.... I have everything to turn it into a Wren-54 Turbine Machine but I want to fly it with the Nitro 1.30 first..... PROP SIZE??? is the only issue left...I think the 3 Bladed is the way to go.... 14x10 or 15x8 have been suggested.....
    Thanks Mojo

  14. #339
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    RE: Its Bobcat nice

    ....if you are talking about the original Nitroplanes Bob-Cat....a 12" prop is all you
    can put on it because of the distance between the booms, and the ground clearance.

    FBD.
    An engineer says.... "That will not work".
    A mechanic says..."Oh yeah, watch this".
    Old age and treachery will overcome youth and skill.
    Revver Bro #4.

  15. #340

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    RE: Its Bobcat nice


    ORIGINAL: Flyboy Dave

    ....if you are talking about the original Nitroplanes Bob-Cat....a 12" prop is all you
    can put on it because of the distance between the booms, and the ground clearance.

    FBD.
    Hello Flyboy!!! The propeller is for the Falcon 120 or it's been called White Falcon as well... Just a bigger version...
    Thanks for checking in...
    Mojo
    Attached Thumbnails Attached Thumbnails Click image for larger version. 

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  16. #341

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    RE: Its Bobcat nice

    Here is my Bobcat.
    Jett .60LX Turning A 10-6,.......you can only imagine the RPM.
    Spring air retracts 300
    Removable wings
    Very stable
    Servo canoes
    Crisp roll rate, however, it does require all up trim and still have to hold a touch of up elevator. Yea, its CG properly.
    Even with the Jett its still not exactly a real speedster, just stable and does neat flybys.
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  17. #342

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    RE: Its Bobcat nice

    Whoa! wasnt expecting that big of pics to come thru!!! Sorry guys!!!

  18. #343
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    RE: Its Bobcat nice

    ....I fixed it.

    ....set your picture size at 640x480. [sm=thumbup.gif]

    FBD.
    An engineer says.... "That will not work".
    A mechanic says..."Oh yeah, watch this".
    Old age and treachery will overcome youth and skill.
    Revver Bro #4.

  19. #344

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    RE: Its Bobcat nice

    hello my name is Jacar (spanish) brocker (dutch )
    I wanna build a very small bobcat like plane for a cox golden bee (so I mean really small...)
    could someone help me with plans (mainly for an offeral idea, dimensions and stuff)

    thanks

  20. #345

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    RE: Its Bobcat nice

    Look in the electric forum. There are many Bobcat like planes made for electric which would work well with Cox Bee.

  21. #346
    opjose's Avatar
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    RE: Its Bobcat nice


    ORIGINAL: Flyboy Dave

    ....if you are talking about the original Nitroplanes Bob-Cat....a 12" prop is all you
    can put on it because of the distance between the booms, and the ground clearance.

    FBD.
    I cut a 14" 3 blade prop down to 13" and it fits with about 1/2" to 1/4" clearance.
    There is an art . . . to flying. The knack lies in learning how to throw yourself at the ground and miss.

  22. #347
    opjose's Avatar
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    RE: Its Bobcat nice

    Out of curiosity...

    Are you guys balancing the plane for C.G. using a FULL or empy tank?

    There is an art . . . to flying. The knack lies in learning how to throw yourself at the ground and miss.

  23. #348
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    RE: Its Bobcat nice

    ....empty....the tank sits almost on the C/G.

    FBD.
    An engineer says.... "That will not work".
    A mechanic says..."Oh yeah, watch this".
    Old age and treachery will overcome youth and skill.
    Revver Bro #4.

  24. #349
    thebluemax's Avatar
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    RE: Its Bobcat nice

    Since it is a low wing I would assume it would be balanced upside down? Also, if it has retracts, the retracts are in the down (landing) position?
    thanks...
    My biggest worry is that my wife (when I am dead) will sell my R/C stuff for what I said I paid for it.

  25. #350
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    RE: Its Bobcat nice

    ....yes, you would balance it up-side-down....and no, it doesn't have retracts.

    FBD.
    An engineer says.... "That will not work".
    A mechanic says..."Oh yeah, watch this".
    Old age and treachery will overcome youth and skill.
    Revver Bro #4.


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