RE: Nitro models pusher Bobcat?  
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    • All Forums >> RC Airplanes >> RC Jets >> RE: Nitro models pusher Bobcat?
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    RE: Nitro models pusher Bobcat? - 5/1/2008 6:33:26 AM   
    HobbyHut-RC


     

    Posts: 10
    Joined: 5/4/2007
    From: Bangkok, , THAILAND
    Status: offline     		Ive just purchased a Bobcat 50 in Thailand - I payed 3'500 baht which is approx. $100 USD - I have started to build the bird after spending nearly 2 days reading this massive thread for good advise. I will be fitting the 301 retract system and I have a .46 size western UK racing engine for the power plant with Western UK racing tail pipe. Not sure if it will work but if it seems not practical I shall install my backup OS55AX. Im going to have a go at installing single servo for elevator, as it looks like a simple and effective conversion. This is my first jet type pusher plane and im hopping it will be a good introduction into model jets.

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           Post #: 3176

    RE: Nitro models pusher Bobcat? - 5/3/2008 12:14:21 AM   
    Stick Jammer



    Posts: 2251
    Joined: 11/21/2002
    From: Crete, IL, USA
    Status: offline
    quote:

    ORIGINAL: amcleod

    My 520W1 retracts arrived today, 19 days after ordering. Along with a few other small parts (props, etc) they cost me $168. Shipping came to $31, and excise duty (miraculously!) was $0. So a total of $199.

    I've never used these things before. How are they attached? Self-tapping screws directly into the wood rails? Or machine screws through into blind nuts behind? I like the sound of the second option best.



    Wood screws are fine.

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    The more you fly, the more you buy.

    (in reply to amcleod)
           Post #: 3177

    RE: Nitro models pusher Bobcat? - 5/3/2008 12:19:29 AM   
    Stick Jammer



    Posts: 2251
    Joined: 11/21/2002
    From: Crete, IL, USA
    Status: offline
    quote:

    ORIGINAL: tizer33

    Thanks Stickjammer
    I already got the pipe to fit a 37mm exhaust hole spacing so that makes my choice for me - 55ax.
    Its the weston pusher pipe should work out ok i hope.
    I have got to get the front retract installed yet but am waiting to pick up a cheap nose leg as the local model shop want £47.50 or $90ish for robart one.
    Is a micro servo like the Hitec hs65mg ok for steering?

    Tim.




    Depends what you're flying from. I would not use a micro servo for grass as the nose wheel has the potential to easily strip the gears.

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    The more you fly, the more you buy.

    (in reply to tizer33)
           Post #: 3178

    RE: Nitro models pusher Bobcat? - 5/3/2008 1:24:14 AM   
    KnowCrashes


     

    Posts: 3
    Joined: 3/20/2008
    From: Oviedo, FL, USA
    Status: offline
    quote:

    ORIGINAL: Stick Jammer


    quote:

    ORIGINAL: tizer33

    Thanks Stickjammer
    I already got the pipe to fit a 37mm exhaust hole spacing so that makes my choice for me - 55ax.
    Its the weston pusher pipe should work out ok i hope.
    I have got to get the front retract installed yet but am waiting to pick up a cheap nose leg as the local model shop want £47.50 or $90ish for robart one.
    Is a micro servo like the Hitec hs65mg ok for steering?

    Tim.




    Depends what you're flying from. I would not use a micro servo for grass as the nose wheel has the potential to easily strip the gears.


    We had trouble even using standard Futaba 3004 servos on the nose wheel. Just didn't have the power to turn the steering arrm to the nose wheel. We used a JR 126oz servo. Don't remeber the model # off the top of my head though. We have a second 'Cat under construction and will try a JR DS821 on that one.

    (in reply to Stick Jammer)
           Post #: 3179

    RE: Nitro models pusher Bobcat? - 5/3/2008 5:35:07 PM   
    Stick Jammer



    Posts: 2251
    Joined: 11/21/2002
    From: Crete, IL, USA
    Status: offline     		Original: KnowCrashes

    quote:

    We had trouble even using standard Futaba 3004 servos on the nose wheel. Just didn't have the power to turn the steering arrm to the nose wheel. We used a JR 126oz servo. Don't remeber the model # off the top of my head though. We have a second 'Cat under construction and will try a JR DS821 on that one.


    That's odd. A 3004 should have plenty of power for the nose wheel especially since it doesn't need a lot of movement and that gives the servo quite a mechanical advantage.

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    The more you fly, the more you buy.

    (in reply to KnowCrashes)
           Post #: 3180

    RE: Nitro models pusher Bobcat? - 5/3/2008 10:26:38 PM   
    tizer33



    Posts: 49
    Joined: 3/15/2008
    From: kentKent, UNITED KINGDOM
    Status: online     		so would you say any metal geared servo of 4-5kg torque should do it.
    I do fly off of grass but its a local turf field so you cant really get much smoother except bowling greens ect.. i am however heavy at landings.
    Tim.

    (in reply to Stick Jammer)
           Post #: 3181

    RE: Nitro models pusher Bobcat? - 5/4/2008 1:19:12 AM   
    Wingspam


     

    Posts: 140
    Joined: 12/29/2005
    From: fort worth, TX, USA
    Status: offline     		Caiman.......

    I have about 25 flights on my Bobcat with the 46 ax. It flies the model just fine, but in saying that if I had to do it over again, I would put a 55 on it...
    Mine does not have retracts..





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    Wingspam

    (in reply to tizer33)
           Post #: 3182

    RE: Nitro models pusher Bobcat? - 5/4/2008 1:37:07 AM   
    caiman


     

    Posts: 229
    Joined: 3/21/2002
    From: MonterreyN.L., MEXICO
    Status: offline     		Ok, thank's. I just bought a 55Ax to install it on my Bobcat.

    (in reply to Wingspam)
           Post #: 3183

    RE: Nitro models pusher Bobcat? - 5/6/2008 2:30:11 AM   
    Stick Jammer



    Posts: 2251
    Joined: 11/21/2002
    From: Crete, IL, USA
    Status: offline
    quote:

    ORIGINAL: tizer33

    so would you say any metal geared servo of 4-5kg torque should do it.
    I do fly off of grass but its a local turf field so you cant really get much smoother except bowling greens ect.. i am however heavy at landings.
    Tim.



    I don't think metal gears are really necessary but a standard size servo would be much better than a mini.

    _____________________________

    The more you fly, the more you buy.

    (in reply to tizer33)
           Post #: 3184

    RE: Nitro models pusher Bobcat? - 5/7/2008 10:36:59 AM   
    cyborg1


     

    Posts: 61
    Joined: 11/24/2005
    From: Bangkok, THAILAND
    Status: offline     		I've read through the entire thread, but I haven't seen anyone post their results with a bobcat using a heli engine. I'm planning to install a tt .50 pro heli engine on mine. Does anyone have any experience to relate? keep the thread rolling....

    (in reply to Stick Jammer)
           Post #: 3185

    RE: Nitro models pusher Bobcat? - 5/7/2008 6:03:35 PM   
    caiman


     

    Posts: 229
    Joined: 3/21/2002
    From: MonterreyN.L., MEXICO
    Status: offline     		Heli engines have better cooling than airplane engines, the problem might be that they are optimized to run at half throttle most of the time. But I think it might work well anyway.

    (in reply to cyborg1)
           Post #: 3186

    RE: Nitro models pusher Bobcat? - 5/7/2008 6:17:52 PM   
    opjose



    Posts: 6146
    Joined: 11/26/2005
    From: Poolesville, MD, USA
    Status: offline
    quote:

    ORIGINAL: AGR413

    I think you guys need to relax about the engine choice/speed deal. I used a doppler program on my original bobcat video and found the top speed to be 108 with a still breaking in engine set very rich on a 12x6 zinger. I have since put on a pitts muffler and switched to an 11x7 APC and it is much faster now. BTW my bobcat is without retracts. Others have mentioned the limitation for speed on this airframe has more to do with the airframe not the engine.

    This is by the way a tower .75. I have done the math earlier in this thread look for yourself.



    Yup, the T.H. 75 or the GMS hauls on this thing.

    Since I've switched out to an 8 pitch prop the jet guys have been very impressed with my little "cat".



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    Build em'', fly em'', crash em'' and build more.

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           Post #: 3187

    RE: Nitro models pusher Bobcat? - 5/7/2008 6:20:00 PM   
    opjose



    Posts: 6146
    Joined: 11/26/2005
    From: Poolesville, MD, USA
    Status: offline
    quote:

    ORIGINAL: Stick Jammer

    That's odd. A 3004 should have plenty of power for the nose wheel especially since it doesn't need a lot of movement and that gives the servo quite a mechanical advantage.



    Yeah that's what I'm using on the nose w/o problems.

    While 45 degrees or more of stearing rotation in each direction is NICE, it is not needed to fly this plane



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    Build em'', fly em'', crash em'' and build more.

    (in reply to Stick Jammer)
           Post #: 3188

    RE: Nitro models pusher Bobcat? - 5/12/2008 6:50:54 PM