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? - 5/16/2008 4:48:37 AM   
    Thai-fly


     

    Posts: 49
    Joined: 9/23/2003
    From: Bangkok, THAILAND
    Status: offline     		I will be back in Bangkok today. Do you still have the Bobcat kit for 3500 Baht? I will take it if you still have it.

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    TF

    (in reply to HobbyHut-RC)
           Post #: 3201

    RE: Nitro models pusher Bobcat? - 5/16/2008 10:09:29 PM   
    rhungent


     

    Posts: 7
    Joined: 2/25/2008
    From: Bellaire, TX, USA
    Status: offline     		I would NOT recommend flying with a 46. I mounted a ThunderTiger PRO 46 and it flew; but was a bit sluggish. Struggles too much against the wind. Does not climb very well at all. Don't even think about trying a loop. Due to pilot error, I banked and flew it up a 60 degree climb (sun blocked my view). Before I knew it, bobcat stalled and could not recover....complete loss. (I am getting nitroplanes redbull 540T before getting experience back up to fly the jet.)

    I would strongly recommend what others in this thread are recommending and having sucess with. OS55, Tower75...
    Richard

    (in reply to Thai-fly)
           Post #: 3202

    RE: Nitro models pusher Bobcat? - 5/16/2008 10:13:27 PM   
    opjose



    Posts: 6145
    Joined: 11/26/2005
    From: Poolesville, MD, USA
    Status: online     		I guess it depends upon WHICH .46 you use.

    I flew mine with the Tower Hobbies .46, and it flew just fine. Not sluggish at all.

    However it is NOT a speed demon with this size of an engine. In spite of that the plane easily topped 55mph and did well ( but NOT unlimited ) on verticals using a 10x7 3 blade pusher prop.



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           Post #: 3203

    RE: Nitro models pusher Bobcat? - 5/16/2008 10:39:28 PM   
    Pit-Viper 1



    Posts: 933
    Joined: 9/14/2005
    From: Westminster, CO, USA
    Status: offline     		That's strange you say that about the TT46pro. I had one on a trainer/sport plane and I actually thought it was a very good motor. I only had 7 flights on it when it found a new home in the bottom of a nearby swamp,, lol I was chasing seagulls with my son on trainer box and lost the signal. I thought it was a very good motor for having such little time on it. I am defiantly getting another one for the trainer I'm working on now, PT40 w/ 0% dihedral in the wing. It actually reminded me a lot of the OS.46 in appearance and reliability.


    Shane

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    (in reply to opjose)
           Post #: 3204

    RE: Nitro models pusher Bobcat? - 5/19/2008 5:45:18 PM   
    waltjg


     

    Posts: 2
    Joined: 4/9/2007
    From: Crystal River, FL, USA
    Status: offline     		Hello Everyone!
    Have been watching this thread for awhile now, and would like to get one of those yellow Bobcat s, but they are sold out "temporarily".. Anyway, had a question, was thinking of ordering that gms 76 but got to looking and it is the same weight, and the same physical size as a .91. So has anyone put a 91 in this plane? Any thoughts?? Guess I don't mind purchasing an engine, but really dont want to end up with an engine that is undersized for some planes and oversized for others, would like to use it in another plane down the road and the 91 seems more of a "standard" size..Ohyeah,,,it would have more power too,,,but I'm sure the 76 would be plenty for this plane!.. Thanks! Walt

    (in reply to Pit-Viper 1)
           Post #: 3205

    RE: Nitro models pusher Bobcat? - 5/19/2008 5:59:12 PM   
    opjose



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

    ORIGINAL: waltjg

    Hello Everyone!
    Have been watching this thread for awhile now, and would like to get one of those yellow Bobcat s, but they are sold out "temporarily".. Anyway, had a question, was thinking of ordering that gms 76 but got to looking and it is the same weight, and the same physical size as a .91. So has anyone put a 91 in this plane? Any thoughts?? Guess I don't mind purchasing an engine, but really dont want to end up with an engine that is undersized for some planes and oversized for others, would like to use it in another plane down the road and the 91 seems more of a "standard" size..Ohyeah,,,it would have more power too,,,but I'm sure the 76 would be plenty for this plane!.. Thanks! Walt


    A .91 may be too much.

    The .76 gives it unlimited verticals.

    The biggest problem with the .91 will be propping the engine properly. There isn't anything that will fit AFAIK.

    With the .76 I'm happy with a Graupner 11x8 Pusher 2 blade prop. I would prefer something like a 11x10P were it available for even more speed, or a 12x8P which is about the biggest prop you could safely fit.... but these do not exist.





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

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           Post #: 3206

    RE: Nitro models pusher Bobcat? - 5/19/2008 6:00:43 PM   
    NM_Mark



    Posts: 440
    Joined: 8/1/2002
    From: Alamogordo, NM, USA
    Status: offline     		I had a friend put an OS 91 in this plane - and it worked OK, but he was limited by prop selection (and prop clearance between the booms). My Bobcat worked just as well with an OS 55 - better fuel mileage, and it was lighter - easier to fly and land. Lighter is better, in my eyes.

    Mark

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    (in reply to waltjg)
           Post #: 3207

    RE: Nitro models pusher Bobcat? - 5/19/2008 6:05:15 PM   
    waltjg


     

    Posts: 2
    Joined: 4/9/2007
    From: Crystal River, FL, USA
    Status: offline     		I agree Mark, lighter is better,,, have been looking at the magnum 52, but I have several 46 sized engines now.. Have seen on here that Mag. 52 and the os 55 flies it pretty good too! thx w.

    (in reply to NM_Mark)
           Post #: 3208

    RE: Nitro models pusher Bobcat? - 5/19/2008 10:17:17 PM   
    Pit-Viper 1



    Posts: 933
    Joined: 9/14/2005
    From: Westminster, CO, USA
    Status: offline     		I have a Magnum.52 that I will be putting on mine. This thing turns some serious rpm's. Going to try it with a 12.25X3.75APC. When I had this combo on a twist40 it was way too much for that type plane but it would haul some serious but. Anyone have this prop they could try to see how it works?


    Shane

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    (in reply to waltjg)
           Post #: 3209

    RE: Nitro models pusher Bobcat? - 5/19/2008 10:35:54 PM   
    opjose



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

    Even if you are able to obtain the Magnum's maximum RPM of 18000 revs you would still only be looking at a prop pitch speed of 63.92mph which IMHO is pretty low.

    You would do better with an 11x7P prop.

    It wouldn't be unlimited in the verticals this way, but it should pick up a lot of speed in a dive.



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

    (in reply to Pit-Viper 1)
           Post #: 3210

    RE: Nitro models pusher Bobcat? - 5/20/2008 12:34:24 AM   
    z06kal


     

    Posts: 147
    Joined: 6/25/2004
    From: Woodland Hills, CA, USA
    Status: offline     		I built an electric bobcat 50 with retracts. No need for a pusher prop when you can spin the motor the other way. I spin an APC 12X12E at 11,400rpm. Pulls about 48 amps on 12S lipo somewhere around 2200 watts input power. Pretty mild power system. I guess it is equivalent to about a .91 on high nitro with a pipe. Anyway, even with this much power on a perfectly sized prop level flying speed is about 118mph radar confirmed. Unlimited vertical tho more or less. Doesn't seem to pick up much more speed in a big dive even with an 11lb AUW. This thing is REALLY draggy. The airplane will start to fly impressive at about 140-150, even at 120ish it doesn't look particularly fast. I'm still trying to figure out a motor setup that isn't too heavy that will take the plane to at least 140 unfortunately my run time will go wayyy down. Right now I get comfortable 6-7 minute flight full on it most of the time.

    (in reply to opjose)
           Post #: 3211

    RE: Nitro models pusher Bobcat? - 5/20/2008 2:18:56 AM   
    opjose



    Posts: 6145
    Joined: 11/26/2005
    From: Poolesville, MD, USA
    Status: online     		If you go back a bit in the thread, there are reports of around the same speed with .75 glow engines using lower pitch props.

    Which makes me wish I could get a higher pitch pusher prop for mine!

    That's a huge advantage with your setup. You don't have to fight to get the right prop! You can experiment as you like to obtain the best combo.

    Sounds like you may be able to pick up a bit more speed too.



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    (in reply to z06kal)
           Post #: 3212

    RE: Nitro models pusher Bobcat? - 5/20/2008 3:55:21 AM