RE: GP Super Stearman  
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    • All Forums >> RC Airplanes >> ARF or RTF >> RE: GP Super Stearman
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    RE: GP Super Stearman - 5/9/2004 4:38:48 AM   
    John_RedSox


     

    Posts: 312
    Joined: 7/1/2002
    From: Medfield, MA, USA
    Status: offline     		Mine should be ready by for next weekend. The connecting rod for the ailerons I found did not provide enough throw for the bottom aileron. So I moved the bottom horn which alleviates the problem. Even though the rods are not parallel by dong this, I will sacrifice that to compensate having more aileron throw. I also covered the top wing seam from the wings being glued together. GP should supply some extra covering but I ordered extra red and wasn't too expensive. The kill and receiver switch are in the cockpits which I added gray carpet.. I also altered one of the pilots because the one's that come with it are too similar. I used the "Bennett" easy carb adapter for hookup. Makes things a bit easier. I'm also changing the decals to vinyl. The ones that came with it don't match very well. Overall I'm very pleased with the plane.

    (in reply to crashland 73)
           Post #: 76

    RE: GP Super Stearman - 5/9/2004 5:54:39 PM   
    catspaw


     

    Posts: 56
    Joined: 12/31/2002
    From: stoughton, WI,
    Status: offline     		Has anyone else had a problem with the spinner fitting their gas engine? Someone earlier in the thread mentioned they went with the tru-turn 2.75" T6 spinner with 120 size prop slots. Has anyone else done this, or did you just cut bigger slots and rebalance it?

    John

    (in reply to John_RedSox)
           Post #: 77

    RE: GP Super Stearman - 5/9/2004 6:15:22 PM   
    crashland 73



    Posts: 789
    Joined: 9/10/2002
    From: Oak Grove (in the Ozarks), AR, USA
    Status: offline     		thats what i plan on doing. just cutting it to fit.

    _____________________________

    Want to live forever? Ask me how.
    Eternity; Only one narrow straight road up and a wide smooth road down.

    (in reply to catspaw)
           Post #: 78

    RE: GP Super Stearman - 5/14/2004 2:22:19 AM   
    ghost-RCU


     

    Posts: 257
    Joined: 1/30/2002
    From: STEPHENS CITY, VA, USA
    Status: offline     		Well guys I think after much thought, I'm going to go with an OS 1.60 Twin. Anyone using this engine in their Stearman I would like to hear from you please. Based on what I've read online this is a great little engine. What do you think. Thanks

    (in reply to crashland 73)
           Post #: 79

    RE: GP Super Stearman - 5/14/2004 2:35:52 AM   
    crashland 73



    Posts: 789
    Joined: 9/10/2002
    From: Oak Grove (in the Ozarks), AR, USA
    Status: offline     		Ive goten my G26 and ran it a bit and it has what I would think to have enough power for the stearman. The original spinner is going to work fine with a 16x8 ma k prop. I got my plane in today. WHOOO a lot of parts.

    _____________________________

    Want to live forever? Ask me how.
    Eternity; Only one narrow straight road up and a wide smooth road down.

    (in reply to ghost-RCU)
           Post #: 80

    RE: GP Super Stearman - 5/14/2004 2:44:12 AM   
    Birddog-RCU



    Posts: 1137
    Joined: 1/4/2002
    From: Saratoga Springs, UT, USA
    Status: offline     		I think you may find that you will get better overall performance from the G26 with more prop. Many of us are using 17x8 and 18x6 props with great results in the 8600 range. If you have the ground clearance, do it!


    _____________________________

    Alan Cluff
    Saratoga Springs, UT
    Club Member: Utah Valley Aeromodelers

    (in reply to crashland 73)
           Post #: 81

    RE: GP Super Stearman - 5/14/2004 3:58:41 AM   
    crashland 73



    Posts: 789
    Joined: 9/10/2002
    From: Oak Grove (in the Ozarks), AR, USA
    Status: offline     		what rpm limit should be avoided with one of these engines? I am getting almost 12,000 at times.

    _____________________________

    Want to live forever? Ask me how.
    Eternity; Only one narrow straight road up and a wide smooth road down.

    (in reply to Birddog-RCU)
           Post #: 82

    RE: GP Super Stearman - 5/14/2004 4:16:35 AM   
    Birddog-RCU



    Posts: 1137
    Joined: 1/4/2002
    From: Saratoga Springs, UT, USA
    Status: offline     		Here is a thread that talks to this topic. http://www.rcuniverse.com/forum/m_1733757/anchors_1733757/mpage_1/key_g26%252Crpm/anchor/tm.htm#1733757

    Ralph Cunningham (RCIGN1) is an expert on Zenoah engines. He converted a G26 to electronic ignition for me and it is the best running engine I have. I think you will find that you are right on the limit of where you should run this engine and that a larger prop is needed to convert those rpm into thrust.


    _____________________________

    Alan Cluff
    Saratoga Springs, UT
    Club Member: Utah Valley Aeromodelers

    (in reply to crashland 73)
           Post #: 83

    RE: GP Super Stearman - 5/14/2004 5:32:08 AM   
    crashland 73



    Posts: 789
    Joined: 9/10/2002
    From: Oak Grove (in the Ozarks), AR, USA
    Status: offline     		I got the wings done tonight, that went rather well I thought. About the easiest I believe I have done, but I must admit, I did quite a bit of prayin before I started, I guess all of those parts intimidated me a bit. And this is the largest bipe I have built. What do you mean electronic ignition? Mine doesnt have points so is mine allready electronic?

    _____________________________

    Want to live forever? Ask me how.
    Eternity; Only one narrow straight road up and a wide smooth road down.

    (in reply to Birddog-RCU)
           Post #: 84

    RE: GP Super Stearman - 5/14/2004 6:08:04 AM   
    Birddog-RCU



    Posts: 1137
    Joined: 1/4/2002
    From: Saratoga Springs, UT, USA
    Status: offline     		I had the magneto system removed and an electronic spark system powered by a battery installed in the base of the engine. The engine came out 2.5 lbs without muffler. You can see pictures at http://www.rcuniverse.com/forum/m_1686995/anchors_1750135/mpage_1/key_/anchor/tm.htm#1750135 and you will also see that the cooling fins were reduced somewhat.


    _____________________________

    Alan Cluff
    Saratoga Springs, UT
    Club Member: Utah Valley Aeromodelers

    (in reply to crashland 73)
           Post #: 85

    RE: GP Super Stearman - 5/14/2004 1:29:31 PM   
    rongreg13



    Posts: 424
    Joined: 8/28/2002
    From: Loveland, OH, USA
    Status: offline     		Well, my Stearman should be ready to fly this weekend. I've got the G26 (which has already flown in another plane) installed and ready to go. When I get home from work tonight, I'll post some pictures of my installation. The engine fits GREAT! I've got only the top of the plug cap protruding along with the exhaust stacks at the bottom of the cowl. On the side, I've got the kill switch, a fuel dot, and I've also got the velocity stack protruding through the cowl (mine is a B&B G26). I didn't want to cut the hole for the velocity stack, but without it, choking the engine becomes an issue. Now I can just put my finger over the velocity stack to bring the fuel into the carb. The best part is the velocity stack looks almost like a scale exhaust stack so it really doesn't detract that much from the plane. I'm planning on flying it this weekend, although I'm not sure if the weather is going to cooperate, so we'll hope for the best. I'll get the pictures taken as soon as I can.

    (in reply to Birddog-RCU)
           Post #: 86

    RE: GP Super Stearman - 5/14/2004 1:35:54 PM   
    John_RedSox


     

    Posts: 312
    Joined: 7/1/2002
    From: Medfield, MA, USA
    Status: offline     		ron-

    What prop are you using for the g26? i have a 16x8 on mine and plan to fly it this weekend. my guess is i could go bigger but by how much?


    John

    (in reply to rongreg13)
           Post #: 87

    RE: GP Super Stearman - 5/14/2004 1:37:00 PM   
    rongreg13



    Posts: 424
    Joined: 8/28/2002
    From: Loveland, OH, USA
    Status: offline     		Just some background on my setup--I'm using Hitec 475HB servos w/ a 6 volt battery and Futaba PCM receiver. I replaced the throttle pushrod with a plastic nyrod, and had to make some hard wood standoffs to space the engine away from the firewall. This also necessitated bending the fuel lines coming from the tank so they do not contact the rear of the crank. I'm using a dual clunk setup in the tank with one for fueling/defueling through a fuel dot. The engine has a GP kill switch, the stock dummy radial, and a Tru-Turn 120-slot AT6 Spinner to fit the bigger props this engine turns (I prefer an APC 17x6W). I've got the front pilot stock with a switch/charge jack in the cockpit with him and I customized the rear pilot so the plane isn't being piloted by identical twins. I've also added an i4c digital volt meter in the rear cockpit as well. About the only other mods I made were substituting 4-40 socket head bolts for the 4-40 screws which attach the interplane struts to the wings and I also used 4-40 aileron connections with heavy duty control horns on all of the servos. It's a pretty simple and straightforward plane, so I'm not anticipating any issues. I haven't weighed mine yet, but I'm guessing it will be over 12 lbs. Should perform GREAT with the G26 and I have not balanced it yet, so I can't say if I will need to add ballast or not yet. When I've flown it, I'll post a flight report with the G26.

    (in reply to rongreg13)
           Post #: 88

    RE: GP Super Stearman - 5/14/2004 1:39:06 PM   
    rongreg13



    Posts: 424
    Joined: 8/28/2002
    From: Loveland, OH, USA
    Status: offline     		As a reply to the previous post--I'm using an APC 17x6W, but I've also flown this engine with an APC 18x6W. Both perform GREAT. The 17x6W allows higher revs with better throttle response. On a CG Sukhoi, the 18x6 turned a bit slower but really helped with the vertical. On this plane, I'm going to start with the 17x6W since I won't be performing any 3D-type maneuvers!!!

    (in reply to rongreg13)
           Post #: 89

    RE: GP Super Stearman - 5/14/2004 3:04:29 PM   
    crashland 73



    Posts: 789
    Joined: 9/10/2002
    From: Oak Grove (in the Ozarks), AR, USA
    Status: offline     		I will definatly be looking forward to those pics with the G26 instalations. I need some info.

    _____________________________

    Want to live forever? Ask me how.
    Eternity; Only one narrow straight road up and a wide smooth road down.

    (in reply to rongreg13)