RE: New 81" GP Super Chipmunk  
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    • All Forums >> RC Airplanes >> ARF or RTF >> RE: New 81" GP Super Chipmunk
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    RE: New 81" GP Super Chipmunk - 12/17/2007 7:41:14 PM   
    JNorton



    Posts: 3134
    Joined: 1/29/2002
    From: Montague, MI, USA
    Status: offline
    quote:

    ORIGINAL: RCHubbub

    Wow, after spending all of this time reading through 37 pages, this thread just came to a screeching halt. What happened?

    Well it's embarrassing I haven't put mine together yet. I've a Saito 150, Robart Struts, Dubro Anti Vibration mount, Hitec 5625 servos, 1500 MAH NiMh pack, Carbon fiber tubes for the wing and elevator.

    I went through some very hard times last Spring and Summer including loosing my brother. I'm trying to work up the energy to put it together. So I went out and bought a SIG Sun Dancer 40 and the GP Giant Aeromaster. I'm a glutton for punishment. I hope to have all three in flying condition for Spring. We will see.
    John

    _____________________________

    Have desk ... Will Fly....
    Saito Member #467

    (in reply to RCHubbub)
           Post #: 926

    RE: New 81" GP Super Chipmunk - 12/17/2007 8:47:53 PM   
    dbmck



    Posts: 22
    Joined: 4/24/2006
    From: Ankeny, IA, USA
    Status: offline     		I have 27 flights on mine. It flies great with the OS 120 Surpass. My only complaint is the rather weak landing gear. Unless you really grease it in the gear winds up bending. It is easy to straighten but it is kind of annoying. If anyone has flown with the Robart struts I would like to know how well they are holding up.

    _____________________________

    Don M

    (in reply to JNorton)
           Post #: 927

    RE: New 81" GP Super Chipmunk - 12/17/2007 10:30:05 PM   
    gary9648


     

    Posts: 1174
    Joined: 10/22/2002
    From: Troy, OH, USA
    Status: offline     		I have about the same amount of flights on mine with a US41 gaser in the nose. Have not bent the gear yet. I try to do a three point landing in the grass to avoid bending the gear. Just bring it over the field with flaps down to about 3-5 inches off the grass and bring the nose up slowly to sall the plane in a three point atitude and let it settle onto the runway just as it stalls.
    Give it a try.
    Gary

    (in reply to dbmck)
           Post #: 928

    RE: New 81" GP Super Chipmunk - 1/17/2008 4:27:57 PM   
    edwal07


     

    Posts: 8
    Joined: 7/31/2007
    From: Bessemer, AL, USA
    Status: offline     		Got my Chipmunk right after Christmas. Downloaded the manual the week before and went to Great Planes website for updates, noticed the new double pins on the center wing area with steel inserts. Really impressed with the way it looks, wasn't really happy with all the ironing I had to do on the wings to smooth them out, but they came out ok.
    Wings and tail feathers complete. Have a CRRC GF26I gasser to mount. Engine is only 3 3/4" from mounts to thrust washer, fabricated a 2" aluminum mount to go between the firewall and standoffs that came with the engine to give me the 6 3/8" spacing as per the manual.
    I have not mounted the engine yet as I have questions on the mount location. It is up and to the right facing the nose. Can someone tell me if I have to mount the engine off to the right, I know the vertical must be where it is to fit the cowl, but can I move the center of the engine to center of the firewall. I know enough about thrust angles to get into trouble. Can someone help me out?
    Thanks
    Ed

    (in reply to gary9648)
           Post #: 929

    RE: New 81" GP Super Chipmunk - 1/17/2008 4:40:51 PM   
    gary9648


     

    Posts: 1174
    Joined: 10/22/2002
    From: Troy, OH, USA
    Status: offline     		edwal, Make sure you read through the intire thread. Also with using a gas engine please forgo the CA hinges on the tail and use either pinned hinges or Robart hinge points. I used the later and placed them so they would go into the ribs for better glue purchase. As far as the engine mount goes, use the cross hatch drawn on the firewall to center up ytour mount. You may have to extend the lines some. All engines crank center should be in the same place. The right thrust is built intro the firewall already.
    Gary

    (in reply to edwal07)
           Post #: 930

    RE: New 81" GP Super Chipmunk - 1/17/2008 5:40:12 PM   
    tazzzz


     

    Posts: 276
    Joined: 3/12/2007
    From: wilmington, NC, USA
    Status: offline     		gary9648 Ive been flying mine for quite a while now with the CA hinges with no problems,,as long as you seal the gap at he bottom so air doesnt flow thru. I running a G-38 on mine and lovin" every minute of it . I also am using the robart struts. Believe me its worth every penny,,,Because they absorb a lot of shock. TAZZZZ

    (in reply to gary9648)
           Post #: 931

    RE: New 81" GP Super Chipmunk - 1/17/2008 6:24:12 PM   
    edwal07


     

    Posts: 8
    Joined: 7/31/2007
    From: Bessemer, AL, USA
    Status: offline     		Thanks Gary and tazzz,
    I just wanted some guidence, I have read all 38 pages and taken notes, I have already installed the CA hinges, and I will seal the gaps, I will keep an eye on them on the preflights.
    I think the GF26I will fit in the cowl ok with just minor trimming for the spark plug and the front of the head. Would you recommend a servo for the choke? I can put a manual one that will come out the bottom of the cowl. Which would be best?
    I plan on mounting the ignition module behind the engine. The mount I fab'd is 3" square on the front with 2" legs. I put a 1/4" piece of ply inside for the blind nuts for the engine. That will allow me to mount the module on the ply between the firewall and the engine, plus room for the 2500mAh battery if needed for nose weight.
    I will post pictures once I get the engine mounted and ask for recommendations and suggestions. This is my first gas engine and my largest plane to date. I have 8 so I am not completely green, but close, I have been out of RC for over 20 years before coming back last July. I really forgot just how much I loved this.
    Thanks for all suggestions and recommendations.

    (in reply to tazzzz)
           Post #: 932

    RE: New 81" GP Super Chipmunk - 1/18/2008 12:27:57 AM   
    tazzzz


     

    Posts: 276
    Joined: 3/12/2007
    From: wilmington, NC, USA
    Status: offline     		Personally I wuold leave the choke at manual,because its really not used that much,,and its just one more servo you dont have to be concerned about. You can devise any number of ways to access the choke, its so much easier,, most engines ,the choke is extremely easy to get at,,,,,But like I said just my opinion. Every thing your doing seems to be fine ,,let us know how you make out. TAZZZZ

    (in reply to edwal07)
           Post #: 933

    RE: New 81" GP Super Chipmunk - 2/8/2008 6:05:15 AM   
    kochj



    Posts: 1427
    Joined: 12/5/2005
    From: Victoria, MN, USA
    Status: offline     		This plane looks great.....
    Price seems to have come down quite a bit!

    I noticed that mose people with glow engines (even 4-strokes) are mounting horizontal?
    why not mount inverted and save the cutting on the side and put it out the bottom!..

    26cc gasser goes good with this one?

    Justin

    _____________________________

    Winning isn''t everything, it''s all there is.

    (in reply to tazzzz)
           Post #: 934

    RE: New 81" GP Super Chipmunk - 2/21/2008 12:44:26 AM   
    sevans16


     

    Posts: 273
    Joined: 11/16/2006
    From: Las Vegas, NV, USA
    Status: online     		I just got one of these on order from my LHS. I am thinking maybe a Saito gasser (built on a 220) 36cc all up weight to be about 61oz. I am also considering the OS FS-200 which is around 35oz. I am thinking I would like to go gas on this bird. Any thoughts on either of the engines???

    _____________________________

    AMA# 737516

    (in reply to kochj)
           Post #: 935

    RE: New 81" GP Super Chipmunk - 2/22/2008 4:02:03 AM   
    kochj



    Posts: 1427
    Joined: 12/5/2005
    From: Victoria, MN, USA
    Status: offline     		Both are too new to have any flight experience......

    I believe both would do well.....
    The NItro os would require some balast....the saito gasser would not....

    _____________________________

    Winning isn''t everything, it''s all there is.

    (in reply to sevans16)
           Post #: 936

    RE: New 81" GP Super Chipmunk - 2/22/2008 6:24:20 AM   
    rc3dflyr


     

    Posts: 23
    Joined: 4/27/2006
    From: Rocklin, CA, USA
    Status: offline     		A chipmunk is a great canidate for smoke especially the 81" GP version. If you guys are lookin for a super light compact smoke pump check out the harris brushless programable competition pump it only wieghs 2.2 oz and does not require an aux battery,other systems are 8+oz. you can find them at harrismodelproducts.com. they are so light and small you wont even feel the wieght. rc3dflyr

    (in reply to kochj)
           Post #: 937

    RE: New 81" GP Super Chipmunk - 2/22/2008 7:35:08 PM   
    kochj



    Posts: 1427
    Joined: 12/5/2005
    From: Victoria, MN, USA
    Status: offline     		Looks nice but the price always goes up when something is lighter than the rest

    I know what you mean when you start adding up the weights......
    I already have a pump for smoke, and I not sure if I will put it on my giant cap or not.....

    I wouldn't have any issues placing the pump in this plane either, even though it is a heavy/normal one....

    Justin

    _____________________________

    Winning isn''t everything, it''s all there is.

    (in reply to rc3dflyr)
           Post #: 938

    RE: New 81" GP Super Chipmunk - 2/22/2008 7:40:05 PM