RE: Nitro models pusher Bobcat?  
View related threads: (in this forum | in all forums)

Tower Hobbies
Enter up to 4 keywords or Tower stock numbers
Logged in as Guest



Users viewing this topic: mardio
  Printable Version
More Resources on the
Bobcat - 50
  • 1 Active Classified Ad(s)
  • See User Ratings
  • Suggest Compatible Equip.
  • Check for Retailers
  • Discussions on this Product


    • All Forums >> RC Airplanes >> RC Jets >> RE: Nitro models pusher Bobcat?
    Page: <<   < prev  134 135 136 137 138 139 [140] 141 142 143   next >   >>  

    Login
    Message << Older Topic   Newer Topic >>
    RE: Nitro models pusher Bobcat? - 9/23/2008 3:10:17 PM   
    cyborg1


     

    Posts: 61
    Joined: 11/24/2005
    From: Bangkok, THAILAND
    Status: online     		i haven't thought about that...as it is, there is enough runway to land safely at my field, but that's a good suggestion which i'll try next weekend. let's see how she slows down then.

    (in reply to BillS)
           Post #: 3476

    RE: Nitro models pusher Bobcat? - 9/23/2008 4:01:11 PM   
    HeliTB



    Posts: 1203
    Joined: 9/14/2006
    From: Fort Washington, MD, USA
    Status: offline     		cyborg1...Awesome idea and job. I may need to try that. My retract pans fitted okay, but after a few hard landings they are toast. The intructions don't point out the fact that the main retract pans are specific to each wing, because the bottom is contoured for a specific wing. Once I realized they wre not the same and needed to be placed in there respective wings they fit fine.

    But anyway, I think what you've done will even add more strength for hard landings as well.


    _____________________________

    Raptor v2 OS 37/Bobcat Jet OS .55 AX
    Extra 330L 25% SV26cc/SIG Kougar OS .46 AX

    (in reply to cyborg1)
           Post #: 3477

    RE: Nitro models pusher Bobcat? - 9/28/2008 4:21:18 PM   
    BillS


     

    Posts: 3077
    Joined: 9/6/2004
    From: Greensboro, NC, USA
    Status: offline
    quote:

    Just a quick question. Getting ready to fly my BobCat for the first time.
    Have a OS.55AX on it and wanted to know you thoughts on a 3 Blade 10x7
    Vrs a 2 Blade 11x7.

    I have no way to read the RPMs. You know anything about 3 Blades for the
    Bobcat?

    The question above was asked yesterday but I have no experience with 3 blade pusher props and can’t answer the question. It always seems like two blade props are safer for the first few flights.

    Bill

    (in reply to HeliTB)
           Post #: 3478

    RE: Nitro models pusher Bobcat? - 10/2/2008 3:51:21 AM   
    cajun1


     

    Posts: 43
    Joined: 6/17/2005
    From: , TX, USA
    Status: offline     		I can't seem to keep the Bobcat from ballooning up on touchdown when I give it a little elevator to soften the landing. Four landings, four bad balloon-stall-crash events.

    I don't have spoilrons mixed in. I am using -50% expo on elevator. The plane flies beautifully and makes great approaches.

    Today, the throttle linkage stuck and I had to fly the gas out. I took it high and when the engine died the glide was beautiful and uneventfull. It came in over the asphalt about 5' high and fast. It was about ready to touch down after 400' and I fed in just a smidgon of El when it ballooned strait up.

    After recovering the ship I compared the amount of El movement with the tiny amount of stick and found the El moved approx 1/8" up.

    Is this plane possibly tail heavy? If not WHAT? The El does not seem sensitive in normal flight, only in slowed down landing attitude.

    Takeofffs, climb outs and flying this plane are a joy, but why can't I land the thing?.....anyone??

    _____________________________

    CAJUN
    FROM DEEP IN THE HEART OF EAST TEXAS PINEYWOOD

    (in reply to BillS)
           Post #: 3479

    RE: Nitro models pusher Bobcat? - 10/2/2008 4:15:45 AM   
    cyborg1


     

    Posts: 61
    Joined: 11/24/2005
    From: Bangkok, THAILAND
    Status: online     		First of all, I would check the cg. is it at 10.5 from the leading edge? If it is, another way to check would be to fly inverted to see if it needs any down elevator input. If it climbs while inverted, then the plane is tail heavy. Then again, do you have the elevator set neutral for forward flight under power? If you have any excess elevator trim during level flight, when you are off power the elevator will be sensitive during landing as there is already some elevator input. I would do what Opjose recommended, that is to use spoilerons - about 1/8-1/4 inch up to control the angle of the nose during landing. It would help in slowing the plane for landing as well.

    (in reply to cajun1)
           Post #: 3480

    RE: Nitro models pusher Bobcat? - 10/2/2008 4:20:40 AM   
    TUMBLER


     

    Posts: 462
    Joined: 6/24/2002
    From: Voorhees, NJ, USA
    Status: online     		Hey,

    I built one of these for a guy and not sure what to tell him to use for throws. I usually go with a lot of thow and use 30-40% expo, but I know everyone is not like that. What do you guys suggest for the average joe flying this plane. I told him to go with 1/8-1/4 spoileron. So what is good for elevator and aileron.

    Thanks!

    Tumbler


    (in reply to cyborg1)
           Post #: 3481

    RE: Nitro models pusher Bobcat? - 10/2/2008 4:25:35 AM   
    cyborg1


     

    Posts: 61
    Joined: 11/24/2005
    From: Bangkok, THAILAND
    Status: online     		elevator throw would be about 1 inch up and down max. Aileron would be about 70% of full throw for high rates, and about 55-60% for low throws. These would correspond to the manual's recommended throws. Some people may find this a little twitchy, but you can always use expo to smooth things out.

    (in reply to TUMBLER)
           Post #: 3482

    RE: Nitro models pusher Bobcat? - 10/2/2008 4:31:06 AM   
    cajun1


     

    Posts: 43
    Joined: 6/17/2005
    From: , TX, USA
    Status: offline     		Thanks Cyborg1 for the info.

    The CG is right on 10.5" from LE at fuse.

    I'll look at the El setting and mix in some spoileron.

    This plane flies too good and looks too hot to give up on.

    _____________________________

    CAJUN
    FROM DEEP IN THE HEART OF EAST TEXAS PINEYWOOD

    (in reply to cyborg1)
           Post #: 3483

    RE: Nitro models pusher Bobcat? - 10/2/2008 4:46:50 AM   
    TUMBLER


     

    Posts: 462
    Joined: 6/24/2002
    From: Voorhees, NJ, USA
    Status: online     		Thanks Man....So are you saying 1" up and 1" down on the levator?


    quote:

    ORIGINAL: cyborg1

    elevator throw would be about 1 inch up and down max. Aileron would be about 70% of full throw for high rates, and about 55-60% for low throws. These would correspond to the manual's recommended throws. Some people may find this a little twitchy, but you can always use expo to smooth things out.


    (in reply to cyborg1)
           Post #: 3484

    RE: Nitro models pusher Bobcat? - 10/2/2008 4:51:02 AM   
    opjose



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

    ORIGINAL: cajun1

    This plane flies too good and looks too hot to give up on.



    Spoilerons are your friend at landing...

    Give it a try it makes a big difference.

    Once the mains are down, keep holding a bit of nose up... the plane will land nose high with the spoilerons...

    Holding nose up bleeds off airspeed and prevents the plane from ballooning...

    It will come in a bit steeper but with slightly less speed.



    _____________________________

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

    (in reply to cajun1)
           Post #: 3485

    RE: Nitro models pusher Bobcat? - 10/2/2008 5:00:05 AM   
    cyborg1


     

    Posts: 61
    Joined: 11/24/2005
    From: Bangkok, THAILAND
    Status: online     		Yes, elevators are 1" up and 1" down max

    (in reply to opjose)
           Post #: 3486

    RE: Nitro models pusher Bobcat? - 10/2/2008 1:13:28 PM   
    HeliTB



    Posts: 1203
    Joined: 9/14/2006
    From: Fort Washington, MD, USA
    Status: offline     		I'm almost finished my repairs, once side is complete. I will most definitely use spoilerons on my next flight.

    Cajun1...I understand the giving up, I felt the same way. I can flight the heck out of any other plane and land without issue, but this one is way different. I think I have it figured out.


    _____________________________

    Raptor v2 OS 37/Bobcat Jet OS .55 AX
    Extra 330L 25% SV26cc/SIG Kougar OS .46 AX

    (in reply to cyborg1)
           Post #: 3487

    RE: Nitro models pusher Bobcat? - 10/5/2008 4:54:17 AM   
    TBello


     

    Posts: 6
    Joined: 5/22/2007
    From: Jersey City, NJ, USA
    Status: offline     		Thank you to TUMBLER for helping me put this Bobcat together. Master builder!

    I threw a new OS55ax on it and learned the hard way about proper CG. Ended up taking advise from OPJOSE and using Spoilerons, now flies like a dream. The one thing I've learned about this plane is it needs to be configured perfectly or it will F@#$ with you BIG TIME!





    Check out the video :-)

    http://www.youtube.com/watch?v=mnQsRNtjPXc&feature=email



    < Message edited by TBello -- 10/5/2008 4:01:22 PM >

    (in reply to bob092)