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GP Super Stearman

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Old 04-21-2004, 01:21 PM
  #26
rongreg13
 
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Default RE: GP Super Stearman

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.
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Old 04-21-2004, 02:09 PM
  #27
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Default RE: GP Super Stearman

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!!
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Old 04-21-2004, 02:33 PM
  #28
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Default RE: GP Super Stearman

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!
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Old 04-21-2004, 03:08 PM
  #29
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Default RE: GP Super Stearman

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
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Old 04-21-2004, 03:49 PM
  #30
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Default RE: GP Super Stearman

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?
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Old 04-21-2004, 04:46 PM
  #31
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Default RE: GP Super Stearman

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
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Old 04-21-2004, 06:26 PM
  #32
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Default RE: GP Super Stearman

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.
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Old 04-21-2004, 08:35 PM
  #33
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Default RE: GP Super Stearman

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
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Old 04-21-2004, 09:44 PM
  #34
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Default RE: GP Super Stearman

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.
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Old 04-21-2004, 09:50 PM
  #35
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Default RE: GP Super Stearman

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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Old 04-21-2004, 11:00 PM
  #36
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Default RE: GP Super Stearman

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.
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Old 04-22-2004, 12:31 AM
  #37
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Default RE: GP Super Stearman

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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Old 04-22-2004, 11:33 AM
  #38
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Default RE: GP Super Stearman

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.
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Old 04-22-2004, 12:57 PM
  #39
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Default RE: GP Super Stearman

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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Old 04-22-2004, 01:23 PM
  #40
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Default RE: GP Super Stearman

The big aerobatic planes are much more substantial airframes designed for the bigger engines. This little Stearman is just not enough plane in my opinion for a 39cc engine. I think you'll find it is overkill for this airframe unless you're looking to do 3D with the plane or something crazy like that. Hold one of the 20x10 or 21x8 props up to the Stearman's cowl, dummy radial, and spinner and you'll see it was just not designed for power of this type. I'll post some pictures tonight of the comparison if I get the chance. Haven't checked on mine, but I'm guessing ground clearance may also be an issue, but mostly I would be concerned about overpowering the airframe with the 2.4. You'll never have to go over 1/2 throttle even for takeoff with that little powerhouse up front! I've used the Brison 2.4 on my DP Edge and also had one in a Yellow Aircraft P-47 once upon a time, and that was a 24 lb. plane that had plenty of power to do the big loops and such. If you're going to try it out, keep us posted as I am very interested in your results!
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Old 04-22-2004, 01:31 PM
  #41
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Default RE: GP Super Stearman

Another comparison, as far as power is concerned, would be the Ziroli Stearmans. He's got the 77" and the 87" models both designed for gas engines. The 77" model weighs in around 20 lbs or so and is designed for a G38 or US41. These engines swing an APC 20x8W at around 7200 RPM. The Brison 2.4 will swing the 20x8W at 7800 and is a much more powerful engine that the G38/US41/Q42's throughout the powerband. The GP model is kind of in that gray area between small glow-powered planes and larger gassers. This is why I still think something like a G26, RCS140, or even the RCS 180 would be a good gas choice to have plenty of power without tearing up the airframe. With the proper reinforcements, the larger engines might work, but I'll stick with the smaller ones.
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Old 04-22-2004, 01:41 PM
  #42
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Default RE: GP Super Stearman

HI Ron,

What are your observations re strength around the firewall of the plane.
The G26 does vibrate somewhat. Will you need to reinforce the airframe?
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Old 04-22-2004, 02:07 PM
  #43
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Default RE: GP Super Stearman

I got mine a couple days ago but it will have to sit on the shelf while I complete my current project. I'm restoring a pair of used Kyosho Stearmans for me and my brother to fly. Should have them in the air late next week or early the week after.

I also just bought a Cermark Pitts which I plan to put a G26 in. I think I'll do the GP Stearman first though. I'll put the first G26 in it and get another one for the Pitts.

Ralph Cunningham says the G26 will produce over 17 lbs of thrust. In a 15 lb plane, that should give pretty good performance for someone who isn't into 3-d.
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Old 04-22-2004, 02:15 PM
  #44
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Default RE: GP Super Stearman

They've got a neat design with the flat fuselage side pieces protruding through the firewall and triangle stock on both sides of the protrusion to lock it into place. With the G26, I probably won't reinforce too much, as it doesn't shake as bad as a lot of people think. I'm more concerned about strengthening the tail.

Another observation I've had confirms an earlier post either in this thread or another, and that's the crappy hinging job that GP has done. The slots for the CA hinges are all crooked and offset on all 4 of my wings. If I were to hinge the ailerons using the stock slots, the surfaces would be horribly offset. I had to rehinge all 4 wings using their power hinge slotter to get everthing lined up satisfactorily.

I do, however, like the pilots they included. A little "customization" and they'll work out great. The covering is also a lot better than most of the monokote ARFs I've seen lately. Mine had absolutely no wrinkling at all and the trim is real nice. I love the spinner as well, but it is just too small for the props the G26 will spin unfortunately.

Cannonball200--I too like the new Chip Hyde tailwheel and for the price, I might try one out for myself. Post some pictures of how it looks if you get the chance. Also, did you have enough wood avalable to give it a good, solid mounting? Supposed to be a ball bearing tailwheel which if it stays clean sure sounds like it would work great!
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Old 04-22-2004, 06:07 PM
  #45
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Default RE: GP Super Stearman

I hope the covering is better then my Christen Eagle.. I got the lower replacement wing and it looks like they did'nt take the time to shrink it..I spent 2hours getting the wrinkles out!![:@]
Oh well it does look like a nice plane(Stearman) Good luck to all!!
Frank
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Old 04-22-2004, 07:00 PM
  #46
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Default RE: GP Super Stearman

Do the servos mount mid-fuselage in a conventional tray for the elevators and rudder?

Is it possible to mount servos in the rear without opening up the covering?

I just ordered mine today and have both a spare G26 and G38 awaiting homes. I will wait for other flight reports before making the engine choice?
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Old 04-22-2004, 07:28 PM
  #47
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Default RE: GP Super Stearman

Apalson,
I havn't checked lately but sheldons hobbies in San Jose had Enya 4 strokes on a closeout. The .91 was 189 and the pumped 120 was 299$
The both run well but the 120 has nearly 2x the power. the 91 is an older non pumped design. They are both still breaking in with @ 1 gallon thru each motor.
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Old 04-22-2004, 10:33 PM
  #48
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Default RE: GP Super Stearman

I fly at Westside RC Field just west of OKC 10 miles (Yukon, Ok)..but there are several nice club sites around here. The Guthrie "Big Bird fly in" will be the first weekend in June(pray for good weather)..This has always been fantastic, you need to be there. About 20 miles north of OKC just off of I-35.
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Old 04-22-2004, 10:37 PM
  #49
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Default RE: GP Super Stearman

No problems with anything. The Stearman is awesume except for the tail wheel and I fixed that.
Get it together......
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Old 04-22-2004, 10:54 PM
  #50
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Default RE: GP Super Stearman

Here's a pic of the Chip Hyde tail wheel..You will need to glue a small plywood plate inside for some good support... I don't have the spring attached to the rudder yet...
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