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  1. #326
    rcguy!'s Avatar
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    RE: Nitro models pusher Bobcat?


    ORIGINAL: H.Dale

    Flight Report Wren MW44:

    I flew mine with the MW44 yesterday. The performance was very similar to the one I saw with an OS 61 on it. On the first flight it was nose heavy and I did not have enough up in the elevator but we got it up and down okay. The second flight was perfect except for a flame out on the turbine. It dropped in from about 15-20 feet but only bent the landing gear. This is a pretty strong little bird.

    Two suggestions, turn the wheels outward on the main gear. It needs a wider stance. It was very unstable on takeoff. Second, make sure you have plenty of elevator.

    Otherwise it is going to be a fun airplane to fly. I think it will be even better with a MW54 or P60 and retracts.

    Hal
    Hal,
    What does it weigh?

    Dave Rigotti

  2. #327
    A10FLYR's Avatar
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    RE: Nitro models pusher Bobcat?


    ORIGINAL: malibuplt

    We have a 40 x 600ft paved runway, but I am still concerned. It would stink to put one together and not be able to fly it. I would put at least a .61 in it. Maybe a turbine on down the road.
    I have flown with Dave by the school there a few times and I don't think you would have a problem with a .60, or even a good .40.
    Dean,
    A10FLYR

  3. #328

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    RE: Nitro models pusher Bobcat?

    ORIGINAL: H.Dale

    Flight Report Wren MW44:

    Hal
    Way to go!!!
    How about some pics?

    Also need final C.G.
    Weight
    Turbine mount
    Time of flight on 32oz
    Wheels and brakes
    anything else you can think of.
    Thanks - Galen






  4. #329
    mugenkidd's Avatar
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    RE: Nitro models pusher Bobcat?


    ORIGINAL: malibuplt

    For you guys that have flown it. Roughly, how much runway are you using. I want to buy one but, I fly at 9,000 ft msl and I am cocerned about getting one airborne up here. Any feedback would be appreciated.

    check out my video at the end I show how quick you can get off of a rough grass field. Thats with a GMS .76 and a 10x8 pusher, the performace maybe a little better with the apc 11x7.. and/or better engine.

    http://members.cox.net/adeloney/babybobcat.wmv

  5. #330

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    RE: Nitro models pusher Bobcat?

    Papasmurf,

    The motor has 633kv and using about 45a full throttle. The ESC is E-Max 60A and the battery is of no name barnd that I got from the factory in China 5s 1p 4000 mah rated at 20-30C. The motor is actually best with an APC 13 X 6 prop, but it looks cooler with the 3 blader. I would like to try 12 X 7 or even 12 X 8 but the shops don't carry any of these sizes. One modification I forgot to mention, I rebuilt the horizontal tailplane as a flat plate instead of using the one in the kit. I feel that the flat bottom section will lift the tail too much while flying and will always cause a nose down tendency. The turbine bobcat has a large upthrust ( the exhaust points down ) but this kit has almost a zero thrustline. Just my 2 cents !!

  6. #331

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    RE: Nitro models pusher Bobcat?

    Bobcat/ Jet Joe JJ1400

    Flew the Bobcat the second time with all problems resolved
    and what a dream plane for the price. It is a rocket and
    that is not at full throttle. The performance with the JJ1400
    is better than that of a Yellow Stingray with my Ram 500.
    In fact, I compared the Stingray wing to the wing of the
    Bobcat and they were almost identical(outer part). The
    Bobcat is a Stingray with booms and elevator. This is the
    cheapest turbine/plane you can buy. I have a video, but
    it is super 8MM and not digital.

    Johnny
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  7. #332
    mugenkidd's Avatar
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    RE: Nitro models pusher Bobcat?

    Sweet Johhny. Good to see a couple of people having luck with the turbine conversions.

  8. #333

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    RE: Nitro models pusher Bobcat?

    MattyC-130: YOUR Q WAS. Is the 10" CG with fuel tank empty or full?

    EMPTY!!!!

  9. #334

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    RE: Nitro models pusher Bobcat?

    Topper5, Thanks for the reply. I will post some pictures when I get my retracts installed.
    Matty

  10. #335

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    RE: Nitro models pusher Bobcat?

    Here is a pic of my retract installation. I am really, really, really slow at building... [:-]

    Dave
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  11. #336

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    RE: Nitro models pusher Bobcat?

    DAVE,

    What size are those Spring Airs are those ?

    Thanks
    \"I never crash, just an occassional mid-air with the Earth\"

  12. #337

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    RE: Nitro models pusher Bobcat?

    hapyjac2,
    I believe that they are the older 300 series. They have been collecting dust in the shop for a long time (at least 7 years). I looked up retracts.com and unable to find exact match.

    Dave

  13. #338

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    RE: Nitro models pusher Bobcat?

    those retracts look like my 605 spring air's that i have in my bobcat, page 4 post #90, not to get off the subject but dose any one have any personal exp with the Mark 61 dbb ringed motor, i'd like to replace my ys-45 with a little more p&v with out paying the high dollar for the dubb-jet motor

  14. #339

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    RE: Nitro models pusher Bobcat?

    Now I am even more confused... (it doesn't take much... )

    The retract is approximately 1" tall, with hole for 3/16" wire. I wanted a softer gear and went with 5/16" wire. The brass tube used to shim the wire can be seen in the picture.

    Dave

  15. #340
    airega1's Avatar
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    RE: Nitro models pusher Bobcat?

    my inst. manual says 6.9" back from the leading edge, if thats true I'll need a cinder block to balnce
    RED RIGHT RETURN!

  16. #341

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    RE: Nitro models pusher Bobcat?

    All flight reports say 9.5" is the correct CG location.

  17. #342
    airega1's Avatar
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    RE: Nitro models pusher Bobcat?

    OK thanks
    RED RIGHT RETURN!

  18. #343
    Crazy4Flight's Avatar
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    RE: Nitro models pusher Bobcat?


    ORIGINAL: airega1

    my inst. manual says 6.9" back from the leading edge, if thats true I'll need a cinder block to balnce
    there was an updated CG posting of 260 mm i thinks

    but I am flying at 10.1" +/-.1

  19. #344
    airega1's Avatar
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    RE: Nitro models pusher Bobcat?

    Great thank you
    RED RIGHT RETURN!

  20. #345

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    RE: Nitro models pusher Bobcat?

    Hi guys need advise on the engine and prop size.

    1-If i mount a OS91FX what would the prop size, can a 10x7p be used?
    2-Would a OS 50fx be enough power for this kitty?
    Just want to Fly!
    www.rc-ms.com
    Formost|Falcon120|Velox|F15|T45|L39
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  21. #346

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    RE: Nitro models pusher Bobcat?

    hay jephry if you are in SINGAPORE, then you are pretty close to sea level and i would say the 50fx will be plenty of motor for the bobcat,
    if you are gonna use the 91fx i would not use smaller then a 11+ prop, in fear of over tacking the motor with a 10x8

    (just my 2cents)

    im using a ys-45 at about 4,500 feet and im getting 80-90+mph.

  22. #347
    Crazy4Flight's Avatar
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    RE: Nitro models pusher Bobcat?


    ORIGINAL: jephry

    Hi guys need advise on the engine and prop size.

    1-If i mount a OS91FX what would the prop size, can a 10x7p be used?
    2-Would a OS 50fx be enough power for this kitty?
    1) IMO OS91FX the would be too heavy, about 8 oz more than 50SX adding at least 4 oz of nose weight total 12 oz or more, & requires 14x6 pusher prop ground clearance issues arise. Then you would need a larger fuel tank or fly a shorter flight.

    2) 50SX is a good choice quality engine and plenty of power. Note this plane was designed for a .45-.50 2-stroke. Mine flys very well with a Dub Jett .50

  23. #348

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    RE: Nitro models pusher Bobcat?

    OK I'll throw in my 2 cents. I flew mine last weekend with an O.S.46 and a 10x8 prop tach was reading 11600 rpm. I used a 2400 mah battery pack in the nose. The CG came out around 9" from the leading edge at the root and it was a little nose heavy. The takeoff from grass was about 150' The control throws were as specified in the manual high rate is a little too much on aileron 80% DR seemed more comfortable. The weight is just under 7.5lbs Speed was 70-80 mph no speedster but very comfortable. Landing was as simple as setting up with the runway and holding some up elevator at low throttle and gliding in.
    I believe a larger motor could be used without much effort, the only problem is ground clearance for the prop. Perhaps a .61 turning the same 10x8 at higher rpm would work out nicely. Or a dubbjet 40-50 and tuned pipe Oh Yeah!
    Gary

  24. #349
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    RE: Nitro models pusher Bobcat?

    anyone know who has any in stock?



    Jason

  25. #350

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    RE: Nitro models pusher Bobcat?

    Got the first flights in on mine today. About all I can say is that it flies. I got two flights in before the nose wheel turned on landing and one of the main wheel blocks popped loose when the plane skidded sideways. Not big deal but a pain to have to fix a plane after two flights. (did I mention I hate nose wheels) I am disappointed with the Saito 72, 11-7 prop combination (I know you told me so). It flew it but it didn't fly it if you know what I mean. Well seeings I have to get into the wing to reattach the landing gear block I am going with my first incliation and putting the 75 two stroke on it. Should be an improvment. For reference my CG is a 10" from the wing at the fuse and it seemed perfect.

    Bassman


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