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 - 4/21/2004 7:21:53 PM   
    rongreg13



    Posts: 424
    Joined: 8/28/2002
    From: Loveland, OH, USA
    Status: offline     		I mentioned this in another post already, but I am kind of bummed that the stock spinner has such small prop openings. The spinner is real nice looking and of high quality and it will fit the shaft of the G26. The problem is the prop holes are too small for the larger props that the G26 will turn. My B&B G26 likes an APC 18x6 for about 8600 RPM static and this won't fit. You can modify the openings to be larger, but instead I'm getting a Tru-Turn 2-3/4" AT6 spinner with the 120-sized slots. This is 1/4" larger, but looks better than the smaller spinner. It will also fit the larger props.

    (in reply to ghost-RCU)
           Post #: 26

    RE: GP Super Stearman - 4/21/2004 8:09:35 PM   
    apalsson



    Posts: 707
    Joined: 6/29/2003
    From: Ballina NSW, AUSTRALIA
    Status: offline     		I wonder about the G26 as compared to the 1.20 w pump.
    I have a G26 in a 1/4 Taylorcraft and while it's a fantastic little engine, it doesn't quite have the power that my mates pumped 1.20 has in the same aircraft but weighs substantially more.
    The G26 is only 1.4cu in and small gassers seldom have the same power as comparable volume glow motors.

    Anyhow, I suspect it will fly the Stearman nicely but from the photos above, it looks like some cutting will have to be done.
    I also wonder about cooling. Don't gas engines need better cooling than glow engines?
    Will you be installing the dummy cylinders?

    Keep these photos coming. I'm determined that I will be buying one of these planes. Beautiful plane!!

    (in reply to rongreg13)
           Post #: 27

    RE: GP Super Stearman - 4/21/2004 8:33:45 PM   
    rongreg13



    Posts: 424
    Joined: 8/28/2002
    From: Loveland, OH, USA
    Status: offline     		First off, the G26 is a 1.6 cu in. engine. I'm on my second one, and this one is a B&B modified engine which is swinging an APC 18x6W at 8600 RPM static. I previously had this engine in a CG Sukhoi as a replacement for a YS 140L. The G26 swings the same prop 100 rpm more static, but the YS has less loss in flight, but not by much. My YS ran on Coolpower 30% heli fuel, which got to be quite pricey expecially with the engine's thirstiness. The biggest dowside is the weight between the G26 and the larger 4 stroke glow engines. With the Stearman, you need nose weight anyways, so why not use the engine as ballast? Gassers are so much more reliable, cleaner, and cheaper to feed that there's really no comparison in my mind. The 4 strokes are much pickier about cooling than a gasser also. I will be using a dummy radial with the bottom cylinder cut away as a cooling duct. The G26 is an easy engine to cool and I don't foresee any issues. Looks like all that will be sticking out the bottom is the sparkplug cap and the exhaust stacks. This is fine with me as this is definitely not a plane for someone looking for a scale masterpiece! Plus, I like to be able to unplug the sparkplug for safety when not flying in addition to the kill switch just in case. I've gotten rid of all of my glow engines (except ducted fan) and can honestly say that I'll never go back. It's just so nice to be able to go to the field with a plane, a transmitter, and a fuel tank and not have to take anything else--including cleaning supplies!

    (in reply to apalsson)
           Post #: 28

    RE: GP Super Stearman - 4/21/2004 9:08:31 PM   
    briansommers



    Posts: 278
    Joined: 2/25/2002
    From: Hendersonville, NC, USA
    Status: offline
    quote:

    I think if someone chose to go with a four cycle, the Saito 170 R3 makes a better choice than a 1.20 single.



    thats interesting you brought that up - im debating on getting the gp stearman, i would love to put this engine in it, i live up at 8000' msl, do you think that would be to much?

    also, how easy it to do smoke with the saito 170 r3?

    thanks

    _____________________________

    ciao!
    Brian S

    (in reply to P-51B)
           Post #: 29

    RE: GP Super Stearman - 4/21/2004 9:49:38 PM   
    John_RedSox


     

    Posts: 312
    Joined: 7/1/2002
    From: Medfield, MA, USA
    Status: offline     		I just rceived mine today. Can somone please tell me about what slaving the top ailerons mean? Would I still need to use the stick that connects the upper and lower ailerons together?

    (in reply to P-51B)
           Post #: 30

    RE: GP Super Stearman - 4/21/2004 10:46:58 PM   
    apalsson



    Posts: 707
    Joined: 6/29/2003
    From: Ballina NSW, AUSTRALIA
    Status: offline
    quote:

    ORIGINAL: rongreg13

    First off, the G26 is a 1.6 cu in. engine.


    Ron,
    I stand corrected here - don't know why I put down 1.4

    I agree with you on the G26 in that it's a fantastic little engine.
    I am at a similar point to you in the way that I am also moving towards gas engines.
    Besides the G26, I also gave a G38 and a ZDZ80.
    They are deadset reliable and less messy in almost all ways.
    Will you be using the stock muffler or will you be fitting a "wraparound pitts" type muffler?

    regards

    Ari

    (in reply to rongreg13)
           Post #: 31

    RE: GP Super Stearman - 4/22/2004 12:26:56 AM   
    WILDMAN 420


     

    Posts: 128
    Joined: 12/11/2003
    From: Owen Sound, ON, CANADA
    Status: offline     		John, Slaving the top ailerons is using the stick that they provide, it is more scale than using 4 servo's which i believe they also provide the space for. Depending on the servo's you use, i would just use the 2 on the bottom wing and slave them, if you are using standard BB servo's put all 4 in.

    (in reply to apalsson)
           Post #: 32

    RE: GP Super Stearman - 4/22/2004 2:35:30 AM   
    John_RedSox


     

    Posts: 312
    Joined: 7/1/2002
    From: Medfield, MA, USA
    Status: offline     		Thanks for the information. That is exactly what I'm going to do. I bought some good servos for the ailerons which should work just fine. Now, if my 160 twin would ever arrive.

    John

    (in reply to WILDMAN 420)
           Post #: 33

    RE: GP Super Stearman - 4/22/2004 3:44:49 AM   
    cannonball200


     

    Posts: 45
    Joined: 8/20/2002
    From: Oklahoma City, OK, USA
    Status: offline     		I bought my Super Stearman on Monday and have it nearly together by Wednesday evening. I'll be going with a Saito 180 Golden Night, or a Brison 2.4.. The plane goes together with excellence. I opted for a new chip hyde tail wheel which looks great.
    Cannonball200 of OKC

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    CANNONBALL200

    (in reply to ghost-RCU)
           Post #: 34

    RE: GP Super Stearman - 4/22/2004 3:50:41 AM   
    crashland 73



    Posts: 790
    Joined: 9/10/2002
    From: Oak Grove (in the Ozarks), AR, USA
    Status: offline     		super nice cannonball, where do you fly at in OK? I am trying to make a weekend and come to OK and fly sometime. keep us informed on the building and more pics.

    _____________________________

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    If you are born twice, you only die once.

    (in reply to cannonball200)
           Post #: 35

    RE: GP Super Stearman - 4/22/2004 5:00:24 AM   
    vettedriver


     

    Posts: 19
    Joined: 3/6/2003
    From: owasso, OK,
    Status: offline     		Just opened the box on mine have you found any problems on assembly, maybe the rain will hold off, hope all is well in OKC.

    (in reply to cannonball200)
           Post #: 36

    RE: GP Super Stearman - 4/22/2004 6:31:36 AM   
    Birddog-RCU



    Posts: 1137
    Joined: 1/4/2002
    From: Saratoga Springs, UT, USA
    Status: offline     		The G26 is an amazing engine. I run two of them currently on a Cermark Pitts and Sukhoi. One is converted to EI and weighs about 2.5 lbs without muffler. The conversion was done by Ralph Cunningham and I gotta tell you this guy knows his Zenoah engines. The ignition unit is housed in the rear mount of the engine keeping it all very clean. Very much worth the investment... it runs perfectly! This would be a perfect plane for a converted G26. I can't wait to hear how well they fly. Please keep us posted.

    a few shots of the Pitts to show engine placement

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    _____________________________

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

    (in reply to rongreg13)
           Post #: 37

    RE: GP Super Stearman - 4/22/2004 5:33:39 PM   
    rongreg13



    Posts: 424
    Joined: 8/28/2002
    From: Loveland, OH, USA
    Status: offline     		Ari--The G26 I have is one of the B&B engines that comes with their inverted muffler (non-pitts style). I'm going to stick with it as there is not much room behind the engine to use a wraparound muffer.

    Cannonball200--Wow, you really want to hand a Brison 2.4 on this guy? I've got a Brison 2.4 on my big Dave Patrick Edge 540T. That thing swings an APC 20x10 at 7850 RPM static. My Edge has unlimited vertical and hangs on the prop at around 1/3 throttle. The Edge weighs in at 15 lbs and is a much more substantial airframe. I'm curious to see how yours would hold up to that big of an engine on such a small airframe.

    (in reply to Birddog-RCU)
           Post #: 38

    RE: GP Super Stearman - 4/22/2004 6:57:14 PM   
    P-51B



    Posts: 6139
    Joined: 10/11/2002
    From: An Iceburg in, ANTARCTICA
    Status: online
    quote:

    ORIGINAL: rongreg13


    Cannonball200--Wow, you really want to hand a Brison 2.4 on this guy? I've got a Brison 2.4 on my big Dave Patrick Edge 540T. That thing swings an APC 20x10 at 7850 RPM static. My Edge has unlimited vertical and hangs on the prop at around 1/3 throttle. The Edge weighs in at 15 lbs and is a much more substantial airframe. I'm curious to see how yours would hold up to that big of an engine on such a small airframe.



    Ok, Dave Patrick makes two edge 540's, on is the 40% which I doubt the 2.4 will power, the other is the 79" span version. This plane is 70" span and has two wings...


    The specs give similar weight range, the stearman has MORE wing area. The GP Patty is flying (aerobatics) with 50cc engines...seems the 2.4 should be ok on this.


    Patrick Edge Specs

    Wing Span: 79 in.
    Wing Loading: 23 to 28 ounces per square foot
    Wing Area: 1,200 sq in.
    Length: 76.25 in.
    Weight: 12.6-15 lbs.
    Engine: 1.20-1.80 glow
    24 to 35cc gas


    GP Stearman Specs;

    Top Wingspan: 71.5" (1815mm)
    Bottom Wingspan: 69" (1755mm)
    Total Wing Area: 1466 sq in (94.70 sq dm)
    Weight: 14-15 lb (6.35-6.8kg)
    Wing Loading: 22-23.5 oz/sq ft (67.13-71.71g/sq dm)
    Length: 57" (1450mm)

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