RE: GP Super Stearman
 

For some reason the pictures didn't load in the last post. I reduced the file size so here they are again, I hope.
Shubova
[8D]

RE: GP Super Stearman
 

Shubova, very nice setup, now you need to really look at the Cline fuel system , I have it on my Saito 180 inverted on a kangke Waco UPF7 because of this issue. It not only resolves the siphoning problem but provides a positive fuel flow and allows positive engine performance.

RE: GP Super Stearman
 

I'm sure you right about the Cline fuel system, dam another 60 bucks. [sm=confused.gif]I guess it's worth it. I had the engine running nice but once it siphoned it flooded out the plug I couldn't get it started for nothing. I haven't tried it again for a couple of days so I'll try it tommorow or I'll try another new plug...10 bucks ouch![sm=confused_smile.gif]
Thanks for the input.
Shubova
[8D]

RE: GP Super Stearman
 

rrcten
Just curious...what is the high end RPM's on that 180 Saito. I was going to use a 150 but it's giving me problems so I installed a 180 in my Stearman. They are exactly the same size expect for the height. I checked mine and it’s running almost 10K RPM. I ran it about 5 minutes tuned it and then ran it at idol, I was going to give it full throttle to check the low end but it died on me. Now it won’t start…I think it flooded out even with the onboard glow starter. I’m tired of this crap, [sm=devious.gif] I’m going to get a Cline fuel regulator and that’s that.
Thanks for you advise.
Shubova
[8D]

RE: GP Super Stearman
 

Shubova, here's another source besides Cline, but the same setup; http://www.ironbaymodelcompany.com/i...es/Page438.htm

RE: GP Super Stearman
 

Hi,
Has anyone figured out what scale the GP Supper Stearman is?
Shubova
[8D]

RE: GP Super Stearman
 

Shubova, The scale appears to be between 1/5 and 1/6th scale, 1/5.36 to be more exact.

Rcten

RE: GP Super Stearman
 

rcten,
How did you calculate that? Was there a mathematical formula that you used?
Shubova
[8D]

RE: GP Super Stearman
 

Shubova,
Take the wingspan of real aircraft, in this case 32'2" (386") and divide this by the wingspan of model, 72" and you get 5.36 or 1/5.36th scale.
It doesn't mean the wing cord or fuselage length will come out the same, that all depends on the model designner. This gives you an approx.
idea of scale size.
Hope this helps!
Rcten
[sm=confused.gif]

RE: GP Super Stearman
 

My SS is nearly completed. An initial balance check shows that she's pretty close, with the G-23 mounted up front. I still need to add a battery pack, and re-check everything.

Where does the antenna tube exit the fuselage? My Hitec RX has a foot of wire left inside the fuse. I'd like to get it in a more effective position.

RE: GP Super Stearman
 

Get a long thin wire; I use a wire for welding. Push it through the tube. At the bottom rear of the plane you will see it bulge. Cut a small hole in the covering with an Xacto knife. Then tape the antenna to the wire and pulled it through.
Good Luck!
Shubova
[8D]

RE: GP Super Stearman
 

Well I had my first flight with the Super Stearman. I used the Cline fuel system (regulator) it works great. Although I made mistake with it; they give you a small check valve to put in the exhaust line to maintain tank pressure. When I filled the tank the check valve didn’t allow the air pressure to come out. So cut the line between the tank and the check valve and added a piece of tubing to reconnect the line when the tank is full…it worked. :D

I’m using a Saito 180 with a 16-6 prop which gave me a little over 10 grand rpms. It’s more than enough power; it did rolls and loops with no problems. I have friend who is very good with aerobatics, he flew it and I was surprised [sm=eek.gif]that he could do a decent knife edge and almost was able to hang it on its prop. I suppose if I had the right prop it would have done it.

The only problem that really concerns me now is that I had to add about a ¼ inch down trim to the elevator. I use little trim in rudder and nothing on the ailerons.
I think, from what I have read in the past posts on this thread, is that there may be a problem with the wing incidence. Someone at the field said to check the incidence of the lower wing and horizontal stab to see if they are both at “0”. I haven’t got a chance to check it yet but if that’s okay then I’ll look at the incidence of the top wing. I did notice when I installed the top wing that both wings twisted a little when I screwed them together, may be that’s the problem. If the problem is in the incidence I’ll use nylon washers to adjust it.

Does any one have any advise as far as the incidence?
Thanks and Happy Flying!
Shubova
[8D]

RE: GP Super Stearman
 

Could it be a little tail heavy? If everything checks out OK, I would try to move the CG a little. Good luck

RE: GP Super Stearman
 

Thanks, I should've thought of that. I'll give it a shot, the next time I disassemble the SS. Right now, I'm adding the flying wires.

RE: GP Super Stearman
 

Can someone tell me about the Saito 170 3 cyl. radial as a powerplant for this aircraft.

Thanks, Pete

RE: GP Super Stearman
 

Pete, About the Saito 170R what would you like to know? I can tell this much without question, this engine and aircraft are a perfect match! The sound is beautiful and the idle sound is mesmerizing.

The pulling power is perfect for the scale of a 450 hp Stearman. I tried different props, 16x8 graupner (8500) 17x6 wood (8500) and an 18x6 wood (8000), these of course on an engine not broken in yet on S&W 10% fuel. The 16x8 pulled nicely, 17x6 very nicely, 18x6 sluggest to get off gnd. I yet to try APC's 16x8,17x6. I use a McDaniel onboard glow drvr. and can turn it on and off via a sw. on tranx. works perfect and also provides forward weight for balancing plane. My radio system is of course Spectrum 7, got it when they first came out, not a glitch, works great, and no interference worry's period. Have flown it in 4 different aircraft, biplanes with flying wires everywhere, wire pull-pull systems, ignition systems etc.

Rcten

RE: GP Super Stearman
 

Thanks!

Basically just wanted to know if the combo worked. Guess I'll be ordering the 170 then!

Any other exhaust preferences other then the collector ring?

Pete

RE: GP Super Stearman
 

Pete, I use the Keleo exhaust ring, which fits perfectly and sounds good, the only hole in cowl is for the exhaust exit in the bottom. The flex exhaust extensions by saito will work fine also! If you go to post 943,944 you'll see my engine installation. I also have the 90r running in Hanger 9 Camel, also a perfect match, these engines run good and start on first flip when primed thru the built in priming fitting on carb, no need to choke or use electric statrter.

RE: GP Super Stearman
 

This was at the field last monday. A buddy and I. His is the PT-17, Saito 170R, mine is the Super, YS-140. Bothe fly great at a little over 1/2 throttle.

RE: GP Super Stearman
 

Thanks!

Pete

RE: GP Super Stearman
 

Remember I said I had a problem with the plane climbing on the maiden flight. Before the flight I had checked the CG and it was right on at 5 ½ as the book recommends.
I just checked the incidence, the horizontal stab and lower wing were at 0 to each other. I don’t know how to check it in relationship to the thrust line; I’m assuming the saddle for the bottom wing is correct.
The top wing was about 2 ½ degrees down, at the aft of the wing. I think that is considered negative 2 ½ degrees.[sm=72_72.gif]
Here are some notes I took from this thread and a RC report.

This is from this thread...[:-]
I saw the RC Report and it's backward from what I experienced.
I initially raised my top wing ailerons as a temporary measure to alleviate the pitch change when going to full throttle and the abrupt stall upon landing.
The permanent fix was this:
1. Set the model with the stab horizontal at zero degrees
2. Confirm or change the lower wing to be at zero degrees also.
3. Set the top wing to be one and one-half degrees negative. This allows the top wing to be flying when the bottom wing is stalled.
Again I’m assuming negative means the wing is down at that aft.

This is from the RC Report…[:-]
The airplane was balanced with the CG set 5 1/2 inches back from the lead edge of the top wing. With the wing incidence set and checked, mine was at 2 degrees for both wings.
I’m not sure what 2 degrees for both wings means.
He later goes on to say…
The plane rose off of the runway rather nicely but then tried to climb. It seems that it required quite a lot of down elevator to trim it to level flight. In fact it required more then the radio could give it on the quick trim button.

He lands the plane okay but fails to say what he did about the problem he had with the plane climbing and having to put in so much down elevator. [sm=spinnyeyes.gif] One would think you would really not want to fly the plane with that much trim adjustment in it. Either the CG it off or the wing incidence it wrong, or maybe both.

Does anyone have any suggestions or input that make since.[sm=idea.gif]
Thanks,
Shubova
[8D]

RE: GP Super Stearman
 

Shubova,
If the wing is lower in the back than in the front you have Positive Incidence, for the wing to be negative the leading edge would have to be lower than the trailing edge. So you would raise the T/E and lower the L/E until you get -1 1/2 degrees. Just curious, has any one checked to see if the techical iinformation available from Great Planes gives the incidence.

RE: GP Super Stearman
 

Thanks for the info.
That would be great if someone could find what GP says about incidence. I'll give them a call Monday.
Shubova
[8D]

RE: GP Super Stearman
 

Please report what you find out. My Stearman is ready for the maiden flight, but I have not checked the incidence.

RE: GP Super Stearman
 

Shubova,
On the Great Planes Web Site, you can access their technical page which will give you the CG point Control Throws ETC. According to GP the top wing is Zero
The bottom Wing is Zero and the Stab is Zero.
Hope this helps