GSP Katana 72"...DETAILED BUILD and 3D FLIGHT REPORT  
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    • All Forums >> RC Airplanes >> ARF or RTF >> GSP Katana 72"...DETAILED BUILD and 3D FLIGHT REPORT
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    GSP Katana 72"...DETAILED BUILD and 3D FLIGHT REPORT - 8/19/2003 10:38:03 PM   
    wyldman


     

    Posts: 150
    Joined: 6/21/2003
    From: kansas city, MO, USA
    Status: offline     		I will get you a couple of pictures of the hatch mod it only took a couple of hours to make and most of it is the top of the fuse that you cut out ,this gives you lots of room to get in the fuse and bolt on the wing or what ever and no more springs. in fact you can assemble the plane with out any tools at all in only a minute or two .


    WYLDMAN

    (in reply to TT2)
           Post #: 26

    GSP Katana 72"...DETAILED BUILD and 3D FLIGHT REPORT - 8/19/2003 10:44:07 PM   
    Dangerous Dan



    Posts: 1818
    Joined: 7/19/2002
    From: gainesville, TX, USA
    Status: offline     		TT2,

    The factory recomended CG for this plane is 100-125 mm, which is 4 to 5 inches approxmately, I read in another post that 5 inches placed the CG just in front of the wing tube, so is your CG on the wing tube with your CG at 1/2 behing the factory limit?

    Was this achieved with three 2oz servos in the tail and no lead?

    Thanks in advance

    Dan

    _____________________________

    when inverted down=up and up=$$

    (in reply to TT2)
           Post #: 27

    GSP Katana 72"...DETAILED BUILD and 3D FLIGHT REPORT - 8/19/2003 10:45:37 PM   
    Dangerous Dan



    Posts: 1818
    Joined: 7/19/2002
    From: gainesville, TX, USA
    Status: offline     		thanks Wyldman

    I cant wait to see the pics of the hatch.

    Did the hatch mod add much weight?

    _____________________________

    when inverted down=up and up=$$

    (in reply to TT2)
           Post #: 28

    GSP Katana 72"...DETAILED BUILD and 3D FLIGHT REPORT - 8/20/2003 12:03:31 AM   
    TT2



    Posts: 648
    Joined: 3/19/2002
    From: Osborn, MO, USA
    Status: offline     		dntmn, I measured my CG as per the diagram shown in the instructions. My CG is about 1/2" aft of the rear (max.) CG point shown in the diagram. I didn't add any noseweight or tailweight to achieve the 1/2" aft CG. Three S9402s in the tail and much more stout than stock linkage...which probably added a little more weight to the tail.

    I'm going to shift the CG even further aft the next time I fly the plane. I'll shift it back 1/4" at a time by moving the battery pack until I find the perfect CG for 3D stuff. If I want shift the CG forward (to practice IMAC sequences), I can simply move the battery pack to it's current location strapped to the front of the wing tube support.

    Oh yeah...I ordered another one yesterday just to have a spare! That's how much I like this plane.

    -Tom

    _____________________________

    As complexity approaches infinity, mean time before failure approaches zero...

    (in reply to TT2)
           Post #: 29

    GSP Katana 72"...DETAILED BUILD and 3D FLIGHT REPORT - 8/20/2003 12:20:54 AM   
    Dangerous Dan



    Posts: 1818
    Joined: 7/19/2002
    From: gainesville, TX, USA
    Status: offline     		sounds great! one more question

    In your "IMAC" CG location, how much down elevator is needed when inverted?

    Thanks

    Dan

    PS:
    If you are ordering a second one you might check Jet hobbies
    they have the exact same Katana for $235, with free shipping(saves $30) and a free scale pilot.

    _____________________________

    when inverted down=up and up=$$

    (in reply to TT2)
           Post #: 30

    GSP Katana 72"...DETAILED BUILD and 3D FLIGHT REPORT - 8/20/2003 12:22:13 AM   
    Dangerous Dan



    Posts: 1818
    Joined: 7/19/2002
    From: gainesville, TX, USA
    Status: offline     		[QUOTE]Originally posted by TT2


    Oh yeah...I ordered another one yesterday just to have a spare! That's how much I like this plane.

    -Tom     [/QUOTE]

    Sorry I thought you said was ordering...LOL

    _____________________________

    when inverted down=up and up=$$

    (in reply to TT2)
           Post #: 31

    GSP Katana 72"...DETAILED BUILD and 3D FLIGHT REPORT - 8/20/2003 12:46:13 AM   
    TT2



    Posts: 648
    Joined: 3/19/2002
    From: Osborn, MO, USA
    Status: offline     		<>

    That's something that's difficult to quantify...I suppose I could say 'a tiny bit' if that helps. I like them to be dead neutral so that no down elevator is required in inverted flight. When this happens I usually stop moving my CG back...usually...

    Thanks for the heads-up on Jet hobbies' price. I struck a pretty good deal on mine but that should certainly help others out. When I ordered my first one Chief gave me the run-around for six weeks before I finally gave up on them and ordered from GSP.

    -Tom

    _____________________________

    As complexity approaches infinity, mean time before failure approaches zero...

    (in reply to TT2)
           Post #: 32

    GSP Katana 72"...DETAILED BUILD and 3D FLIGHT REPORT - 8/20/2003 1:09:07 AM   
    Dangerous Dan



    Posts: 1818
    Joined: 7/19/2002
    From: gainesville, TX, USA
    Status: offline     		Jet Hobbies has great customer service and prices, (there is a slight language barrier), I did a review for them a while back.,

    I am really excited about this plane, it will take me a little while to generate the funds to do it right (digital servos, Li battery, etc...)

    Have you talked to GSP about the wing webbing problem?

    If so what was the reply?

    Dan

    _____________________________

    when inverted down=up and up=$$

    (in reply to TT2)
           Post #: 33

    GSP Katana 72"...DETAILED BUILD and 3D FLIGHT REPORT - 8/20/2003 2:12:22 AM   
    Superfast


     

    Posts: 117
    Joined: 12/24/2002
    From: Grandview, MO, USA
    Status: offline     		Here is a link to the pictures wyldman was talking about. The hatch was easy to make and took only a few hours. It saves alot of time at the field simply because I don't have to flip the plane over to get to stuff ! I will try and get a few pictures of the wing mount bolts on there also. It is a great flying plane, mine has a Brison 2.0 and came in right at 12lbs. I will be checking my shear webs tonight :

    Scott

    [URL=http://www.scottsrc.com/katana.html]Katana Hatch Mods[/URL]

    _____________________________

    http://www.scottsrc.com

    (in reply to TT2)
           Post #: 34

    GSP Katana 72"...DETAILED BUILD and 3D FLIGHT REPORT - 8/20/2003 2:20:42 AM   
    Dangerous Dan



    Posts: 1818
    Joined: 7/19/2002
    From: gainesville, TX, USA
    Status: offline     		Great looking Hatch!!!

    _____________________________

    when inverted down=up and up=$$

    (in reply to TT2)
           Post #: 35

    GSP Katana 72"...DETAILED BUILD and 3D FLIGHT REPORT - 8/20/2003 8:57:58 AM   
    Superfast


     

    Posts: 117
    Joined: 12/24/2002
    From: Grandview, MO, USA
    Status: offline     		Ok I did some looking and my Katana also has the shear web going the wrong way. I am also working on a rebuild of a GSP Edge 540T that a fellow flyer crashed. I took a look at that wing and it is the same thing on the shear webs. I wonder if all the GSP planes are that way ??????

    Scott

    _____________________________

    http://www.scottsrc.com

    (in reply to TT2)
           Post #: 36

    GSP Katana 72"...DETAILED BUILD and 3D FLIGHT REPORT - 8/20/2003 6:00:06 PM   
    chewy


     

    Posts: 94
    Joined: 5/8/2003
    From: College Station, TX, USA
    Status: offline     		I'm thinking of getting this plane also. Hey Superfast, I have a A&M(Brison)2.0 to put in mine also. Do you like the power the engine provides? Is it sufficient? I had a couple of people tell me it wasn't enough power and too heavy. I have another 2.0 swinging a Mezjlik 19x8 and it swings it pretty good. Matt

    (in reply to TT2)
           Post #: 37

    GSP Katana 72"...DETAILED BUILD and 3D FLIGHT REPORT - 8/20/2003 8:08:43 PM   
    wyldman


     

    Posts: 150
    Joined: 6/21/2003
    From: kansas city, MO, USA
    Status: offline     		I fly with superfast and he has no problem with the 2.0 hauling the katana ,in fact it's as fast as my 2.4 brison and he's almost a pound lighter because of it .
    he has more than enough power to knife that thing all day long.
    shredder and I checked our katana 's last night and we have the shear web problem ,so superfast must be right ,there all this way.
    WYLDMAN

    (in reply to TT2)
           Post #: 38

    GSP Katana 72"...DETAILED BUILD and 3D FLIGHT REPORT - 8/20/2003 9:43:28 PM   
    Superfast


     

    Posts: 117
    Joined: 12/24/2002
    From: Grandview, MO, USA
    Status: offline