Saito 180 flaming out  
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Saito 180 flaming out - 4/3/2003 12:40:02 AM   
outssider


 

Posts: 1098
Joined: 1/18/2002
Status: offline 		if your lowest reliable idle is 2600...your idle mixture is not set right. after break-in this engine should idle at 1400-1600 easily ...all day long.... with no glow heat attached!!. this may not be causing your problem but may be contributing to it.

once fuel starts flowing, a header tank will not stop fuel from siphoning into the carb...if the main tank is high the fuel will siphon from one tank to the other and then into the carb !!

whats worse!!...if the main tank is too high and the engine needles are set such that it runs well....when you go inverted the engine will go lean...

(in reply to RCAdd1ct)
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Saito 180 flaming out - 4/3/2003 1:11:02 AM   
RCAdd1ct


 

Posts: 166
Joined: 9/27/2002
From: Richardson, TX,
Status: offline 		It is on the lower wing tip opposite the cylinder head.

Sorry for the poor description.


[QUOTE]Originally posted by lgodin
QUOTE: "I have 7 squares of lead opposite the engine for latteral balance ( I hate lead )."

I would too!!! Placing lead weight that close to the engine for latteral balance is just silly, get that weight out on one wing some where, I bet 7 squares would be 1/2 square on a wing tip, If you do not like lead on your tips ( I do not ) place the lead in the servo well and screw down. [/QUOTE]


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Saito 180 flaming out - 4/3/2003 1:21:02 AM   
William Robison



Posts: 20269
Joined: 11/10/2002
From: Mary Esther, Florida, FL, USA
Status: offline 		RCA:

If you needed 7 squares (1/4oz each?) on the wing tip for lateral balance you also have a major airframe problem. That much tip weight, even up to 100" span, is excessive. Something is not built right.

Bill.

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Saito 180 flaming out - 4/3/2003 1:32:52 AM   
RCAdd1ct


 

Posts: 166
Joined: 9/27/2002
From: Richardson, TX,
Status: offline 		UMMM, It's an ARF. I can't quantify their building style since it was covered when I got it.

I agree it is a lot of weight, but that is what it took to balance it out. It loops and rolls straight so I assume the static lateral balance is correct.


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Saito 180 flaming out - 4/3/2003 5:48:09 AM   
outssider


 

Posts: 1098
Joined: 1/18/2002
Status: offline 		it should take about .5 -.75 oz. of weight in the left wing tip of a 1/4 scale plane to counter act the weight of the 180 saito mounted horizontally.

you have somehow accumulated other weight in the right side of the plane !!!!

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       Post #: 30

Saito 180 flaming out - 4/3/2003 6:34:56 AM   
RCAdd1ct


 

Posts: 166
Joined: 9/27/2002
From: Richardson, TX,
Status: offline 		The only thing different from stock parts placement is the tank is moved back, the RX battery is behind the cockpit, the engine is bigger and the pitts style muffler.

One thing though, on the 1/4 scale the wings will be longer than mine. That will give you more leverage to compensate for the motor. with this being a Bipe I am only moving the weight out 22" from the fuse. So there is a big difference between my plane and a 100" 1/4 scale monoplane.

As I said I hate lead. I wish I didn't have to put that much on it but it flies correctly with it there.


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Saito 180 flaming out - 4/3/2003 7:28:41 AM   
nyrcpilot



Posts: 274
Joined: 9/11/2002
From: Constantia , NY, USA
Status: offline 		I found your problem, you have a saito 1.80 mounted on a DP ultimate .40 bipe!

22" from the fuse on the wing tip?


replace the stock 8 oz tank with a bigger one and you 4 minute dead sticks will go away





[QUOTE]Originally posted by RCAdd1ct
The only thing different from stock parts placement is the tank is moved back, the RX battery is behind the cockpit, the engine is bigger and the pitts style muffler.

One thing though, on the 1/4 scale the wings will be longer than mine. That will give you more leverage to compensate for the motor. with this being a Bipe I am only moving the weight out 22" from the fuse. So there is a big difference between my plane and a 100" 1/4 scale monoplane.

As I said I hate lead. I wish I didn't have to put that much on it but it flies correctly with it there. [/QUOTE]

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Saito 180 flaming out - 4/3/2003 8:13:22 AM   
RCAdd1ct


 

Posts: 166
Joined: 9/27/2002
From: Richardson, TX,
Status: offline 		oops I was wrong 54" wingspan - 6" of fuse devided by 2 = 24"

Now I remember why I hated trig. I suck at math.


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Saito 180 flaming out - 4/3/2003 8:25:56 AM   
William Robison



Posts: 20269
Joined: 11/10/2002
From: Mary Esther, Florida, FL, USA
Status: offline 		R eally C rappy A rithmetic:
[QUOTE]Originally posted by RCAdd1ct
oops I was wrong 54" wingspan - 6" of fuse devided by 2 = 24"

Now I remember why I hated trig. I suck at math. [/QUOTE]
And this post proves it. Look at your numbers again. And assumptions.

If the wing tip is 22" from the engine centerline that has to include the fuse thickness. 44" span.

Even if it didn't, two 22" wing panels plus a 6" fuse section (22+22+6) gives a 50" span.

Sorry, I did fairly well with math, and your last post just stuck out to me.

Nonetheless, whether it's 44" or 50" that still seems at the small end for his Saito 91 engine.

And please don't be offended by my breakout of your RCA acronym, it fit too well to resist.

Bill.

_____________________________

Real Airplanes have Two Engines
AMA 25139 - More than 40 years.

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       Post #: 34

Saito 180 flaming out - 4/3/2003 8:32:35 AM   
RCAdd1ct


 

Posts: 166
Joined: 9/27/2002
From: Richardson, TX,
Status: offline 		Damn, now I lost half of my engine! No wonder it won't stay running!

Center line would be 54"/2 or 27"



[QUOTE]Originally posted by William Robison
R eally C rappy A rithmetic:

And this post proves it. Look at your numbers again. And assumptions.

If the wing tip is 22" from the engine centerline that has to include the fuse thickness. 44" span.

Even if it didn't, two 22" wing panels plus a 6" fuse section (22+22+6) gives a 50" span.

Sorry, I did fairly well with math, and your last post just stuck out to me.

Nonetheless, whether it's 44" or 50" that still seems at the small end for his Saito 91 engine.

And please don't be offended by my breakout of your RCA acronym, it fit too well to resist.

Bill. [/QUOTE]


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Saito 180 flaming out - 4/3/2003 9:47:53 AM   
SKYPYRO



Posts: 191
Joined: 2/26/2003
From: Gilbert, AZ, USA
Status: offline 		hmm, this seems like a very familiar problem. A guy out at my field had a UCANDO with an OS 91 FX on it. Every day almost, he would fly it, go deadstick, take it apart, fiddle with the engine and fuel tank, put it together and say "I finally found out what the problem was, it was an easy fix." He would then taxi out, take off and fly away, only to have a flame-out a couple of minutes later. It turned out that the engine was overheating, causing it to idle good, fly up to 2/3rds throttle good, but not do full throttle or 3D manuevers because of the intense heat or the limited airflow. BTW, is 30% fuel reccomended for your engine? This could be the source of the hot engine.

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Saito 180 flaming out - 4/3/2003 12:07:06 PM   
RCAdd1ct


 

Posts: 166
Joined: 9/27/2002
From: Richardson, TX,
Status: offline 		Over heating is one of the things I will look into when I get to fly it again.

The winds are gusting to 35 mph. If if doesn't let up the only thing I will fly will be my heli. It is a nice challenge to keep it steady in high winds. It also kind of looks funny hovering at a 45 degree angle due to the wind hitting it from the side.


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Saito 180 flaming out - 4/3/2003 11:18:18 PM   
outssider


 

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Status: offline 		I was under the impression that 30% nitro makes this engine run cooler !!

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Saito 180 flaming out - 4/3/2003 11:33:24 PM   
PigMan Buggerus



Posts: 827
Joined: 11/26/2002
From: Cincinnati, OH, USA
Status: offline 		That is what I have been led to believe as well. More Nitro means more fuel in cylinder burning at a lower temperature, which means more oil as well. Should be cooler running 30% vs. 15%. Horizon recommends 30% nitro in Saitos for maximum performance.

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Saito 180 flaming out - 4/4/2003 12:34:18 AM   
RCAdd1ct