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? - 2/1/2008 12:44:06 PM   
    Stick Jammer



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

    ORIGINAL: airborne14830

    I am thinking about getting the 50 - 51" bobcat . I see it take 8 servos and are folks using standard or high torque servos? Also, for the elevator, can you do a one servo installation (joining the elevators halfs with a joining bar) versus using two servos? My experience with dual elevator servos have not been good at all. In addition, I'm thinking about using an evolution .61 for power that I have already broken in. If I need more pwoer please advise.

    Thanks



    The elevator is one piece, the rudders are separate. The stock servo configuration is set up for dual mini's on elevator and rudders. Go back to page 99, post 2461 for an option using a single standard servo for elevator and rudders.

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    (in reply to airborne14830)
           Post #: 2851

    RE: Nitro models pusher Bobcat? - 2/1/2008 12:53:42 PM   
    Stick Jammer



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

    ORIGINAL: doubledcom

    Opjose.......Thanks for the info. Maybe I'll try them for all the control surfaces as I was thinking about going with just 1 servo for the rudders and connect the rudders with a control rod as others have done on this thread. They should also be ok I would think for the elevator as well if they have that kind of torque. I don't want to spend a fortune on servos for a 100.00 plane. thanks again



    I modified the tailboom servo bays for standard servos and went with a single on elevator and a single for rudders. I used Hitec HS-475HB's all around. With a 5-cell pack they are rated at 76 oz/in torque. 100 bucks gets you all six, big savings over the stock set up using mini's.

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    (in reply to doubledcom)
           Post #: 2852

    RE: Nitro models pusher Bobcat? - 2/1/2008 2:11:56 PM   
    doubledcom


     

    Posts: 10
    Joined: 3/21/2004
    From: Orland Park, IL, USA
    Status: offline     		Opjose....Just got the graupners....but have not used them...It's going to be quite a long time before I get to test them out .....we just got another 12 inches of snow and gusting winds of 30+ miles per hour....couple days ago we had temps of 20 below zero......I hate winter....

    (in reply to opjose)
           Post #: 2853

    RE: Nitro models pusher Bobcat? - 2/1/2008 2:31:40 PM   
    CrashPro



    Posts: 670
    Joined: 7/10/2003
    From: Indio, CA, USA
    Status: offline
    quote:

    ORIGINAL: opjose


    quote:

    ORIGINAL: CrashPro


    Yeppers on that opjose.....after trying all the other available pusher props (and that includes the 3 bladed props)....came to the conclusion that I was getting the most speed with the Graupner 11x8 prop....


    Have you had any indications that I should pay attention to Graupner's warnings about the max RPM speed on the 11x8 prop?

    According to their included warnings, we should NOT be spinning the prop that fast lest it break apart.






    Haven't had any props come apart on me opjose....I had canopy screw come off and hit the prop and take a chunk out of the prop,...but it still didn't break.

    (in reply to opjose)
           Post #: 2854

    RE: Nitro models pusher Bobcat? - 2/6/2008 8:30:44 AM   
    Lopi


     

    Posts: 1
    Joined: 12/9/2007
    From: Cologne, GERMANY
    Status: offline     		Here is my Bobcat ...
    I make a new Canopy and i think there is a better one...

    Attachments
    Click to see fullsize image.
    Click for fullsize         		Click to see fullsize image.
    Click for fullsize         		Click to see fullsize image.
    Click for fullsize

    (in reply to CrashPro)
           Post #: 2855

    RE: Nitro models pusher Bobcat? - 2/6/2008 2:18:34 PM   
    BillS


     

    Posts: 3077
    Joined: 9/6/2004
    From: Greensboro, NC, USA
    Status: offline     		The canopy looks good. I am attempting to come up with a better method to attach the canopy and am interested in your approach.

    Bill

    (in reply to Lopi)
           Post #: 2856

    RE: Nitro models pusher Bobcat? - 2/6/2008 3:15:11 PM   
    hapyjac2


     

    Posts: 97
    Joined: 3/6/2002
    From: tamarac, FL, USA
    Status: offline     		Bill,
    I have used the rear catch and pin thru the nose method on mine. It is simple and very strong. My Bobcat is turbine powered and the canopy has never even shown signs of being loose. Also allows quick entry to the interior, a must for a turbine powered jet.

    There is a conversion article on my web site which shows how it's done. check it out.

    www.southfloridajettogether.com

    _____________________________

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

    (in reply to BillS)
           Post #: 2857

    RE: Nitro models pusher Bobcat? - 2/6/2008 4:21:13 PM   
    opjose



    Posts: 6145
    Joined: 11/26/2005
    From: Poolesville, MD, USA
    Status: online
    quote:

    ORIGINAL: BillS

    The canopy looks good. I am attempting to come up with a better method to attach the canopy and am interested in your approach.

    Bill



    Here's what I did on my Bobcat .25... it works great. The canopy has never fallen off even though I have the plane screaming through the sky with it's .46 equivalent electric motor.




    The magnets are unneeded. They are holder-overs from my first attempt which did not work well.



    _____________________________

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

    (in reply to BillS)
           Post #: 2858

    RE: Nitro models pusher Bobcat? - 2/6/2008 4:48:23 PM   
    PhilLin


     

    Posts: 106
    Joined: 10/8/2004
    From: Oshkosh, WI, USA
    Status: offline     		Oh yeah. I found out magnets do not work well when in the shear position. I used 2-pairs of 3/16" dia rare earth magnets which worked well after changing them to pull against their flat circular faces. Always had a nagging suspicion that the added stray magnetic field might cause Rx problems close by so had the Rx wrapped around with alu foil; & was able to have good Rx performance.

    @Opjose, care to give a bit more detail on your electric version?

    Phil

    ps: @Opjose, I like the way you mounted your canopy.

    (in reply to opjose)
           Post #: 2859

    RE: Nitro models pusher Bobcat? - 2/6/2008 9:41:29 PM   
    Stick Jammer



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

    ORIGINAL: BillS

    The canopy looks good. I am attempting to come up with a better method to attach the canopy and am interested in your approach.

    Bill



    I've seen a few clever canopy installations in this thread, they all looked good. Personally, with a glow engine and bolted on wings, I don't need to get into the fuse very often. When I do need to access the interior I don't mind removing a few screws. Keep in mind that with a pusher prop anything that comes loose in flight has the potential to do major damage.

    _____________________________

    The more you fly, the more you buy.

    (in reply to BillS)
           Post #: 2860

    RE: Nitro models pusher Bobcat? - 2/6/2008 10:10:10 PM   
    opjose



    Posts: 6145
    Joined: 11/26/2005
    From: Poolesville, MD, USA
    Status: online
    quote:

    ORIGINAL: PhilLin


    @Opjose, care to give a bit more detail on your electric version?

    Phil

    ps: @Opjose, I like the way you mounted your canopy.


    On the Bobcat .25 I'm running a pair of 3900mAh batteries in a 6S configuration ( 22 volts ) driving a 893KV motor, a 10x7 pusher and a 60Amp ESC capable of dealing with the 22volts. Fortunately the ESC was more than able to handle all of the micro & mini servos used.

    This turned the little Bobcat .25 into a little screamer of a plane.

    It draws about 700+ watts 38Amps, so it is roughly the equivalent of a .40+ glow engine.

    Unfortunately it is a non-retract plane due to it's size.

    The canopy mount I used above enables quick access to the battery packs.

    I had to remove one of the formers to get both of the batteries to fit.

    The clips I used are from Dubro. Two pairs could be used to firmly attach a canopy for the larger sized Bobcat .


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

    (in reply to PhilLin)
           Post #: 2861

    RE: Nitro models pusher Bobcat? - 2/7/2008 12:11:44 AM   
    BillS


     

    Posts: 3077
    Joined: 9/6/2004
    From: Greensboro, NC, USA
    Status: offline     		Thanks for the canopy mounting information. Parts of both ideas will be used.

    The South Florida Jet site was very interesting. The canard's were particularly interesting.

    Bill

    (in reply to hapyjac2)