RE: My 2300 only likes one prop

RE: My 2300 only likes one prop
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RE: My 2300 only likes one prop - 1/30/2006 11:01:22 PM

Not24

Posts: 999
Joined: 12/7/2002
From: Gloucester, VA, USA
Status: offline

quote:

ORIGINAL: Flyer95

Not 24,
Did you say you had a OS108 FSR??, if so just take that OS7D carburetor and put it on your G2300 for some tests.
Then you know if your fuel, plug, muffler, compression............ is good or not .

If your engine runs bad on that carb. then you know something else is wrong.

To tell you the truth, I don't really like the 7D carb. It has a funny low end adjustment that has limited range. The ST carb has two needles which will yield infinite adjustment. Mechanically, the 7D is very good, and it does run well. Mine is the remote needle version, which may be harder to transfer to the 2300. I'll look into switching it over and do some ground runs to see if I can tell any difference. I think I should go back to the stock muffler for all tests involving the carb.

If by chance the 7D does fix it, I will be disappointed. Replacing a carb on a new engine to get it to function is not acceptable by my standards. It would prove to me that the engineering at SuperTigre is lacking, and they are selling a product that should be improved before it hits the market. I honestly hope it runs similar with the 7D, then I can look elsewhere for the problem.

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Fly it till you break it!

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Post #: 26

RE: My 2300 only likes one prop - 1/31/2006 4:50:44 AM

cng

Posts: 13
Joined: 12/4/2005
From: anthem, AZ, USA
Status: offline

not24 if you are running the lower nitro content you are probably leaning the high end needle out and maybe even overheating the motor. Higher nitro burns more efficiently without the need to lean the top end out. The combination of glow to fuel could have something to do with this but hopefully you have made subtle changes each time you have tried something different. big changes equal big results. It is easier to go back to the previous setting if it is done in moderation. I run on my 2300 a os f type plug. 15% nitro and minimal 18% oil. It will idle as good as any os motors I have and the transition is good to full power. I do not play into too much mid range. if it is a little rough through the mid range that's ok. Who really flies at half throttle through their routine? Most drop engine rpm on the down side and increase through the level or up lines. inadvertently leaning out to a comfortable range. Try tuning the high end level not with the nose straight up. Then come down rich 2 to 3 clicks. This will ensure preventing overleaning on your straight lines and keeping enough fuel draw during the times your motor is heating up the most especially vertical. Try a fresh plug and starting at the out of the box orientation for your needle. Given that all the nuts and bolts are tight and your not losing any seals your pressures inside the motor should maintain it's performance. I am very happy with mine. I run a 17x8 apc with 15% omega fuel and f type plug. I keep it just a hair rich. Runs at 9300 rpms Not one DS landing yet.

(in reply to Flyer95)

Post #: 27

RE: My 2300 only likes one prop - 1/31/2006 8:18:57 AM

Flyer95

Posts: 978
Joined: 9/21/2004
From: STOCKHOLM Akersberga, SWEDEN
Status: offline

quote:

ORIGINAL: Not24

quote:

ORIGINAL: Flyer95

Not 24,
Did you say you had a OS108 FSR??, if so just take that OS7D carburetor and put it on your G2300 for some tests.
Then you know if your fuel, plug, muffler, compression............ is good or not .

If your engine runs bad on that carb. then you know something else is wrong.

To tell you the truth, I don't really like the 7D carb. It has a funny low end adjustment that has limited range. The ST carb has two needles which will yield infinite adjustment. Mechanically, the 7D is very good, and it does run well. Mine is the remote needle version, which may be harder to transfer to the 2300. I'll look into switching it over and do some ground runs to see if I can tell any difference. I think I should go back to the stock muffler for all tests involving the carb.

If by chance the 7D does fix it, I will be disappointed. Replacing a carb on a new engine to get it to function is not acceptable by my standards. It would prove to me that the engineering at SuperTigre is lacking, and they are selling a product that should be improved before it hits the market. I honestly hope it runs similar with the 7D, then I can look elsewhere for the problem.

Not 24,

I am like you and hate to replace anything on a brand new engine

and I realy like the st engines.
I have some thoughts and drawings about how to fix the st carb. maybe I can upload them here later today.
Change only one thing at a time! I would say change the carb first and go fly and only if you have fueldraw problems then change to the stock muffler.Otherwise you wont know what solved the problem.

(in reply to Not24)

Post #: 28

RE: My 2300 only likes one prop - 1/31/2006 7:47:29 PM

Flyer95

Posts: 978
Joined: 9/21/2004
From: STOCKHOLM Akersberga, SWEDEN
Status: offline

Hi again,

These are some drawings I have done. The first picture is the spraybar as it comes stock without any modification and the second picture is how I think

it should look like after the modification for good midrange. Maybe a very sharp knife is enough to grind out the material and get the job done?

Attachments

Click to see fullsize image.

Click for fullsize

Click to see fullsize image.

Click for fullsize

(in reply to Not24)

Post #: 29

RE: My 2300 only likes one prop - 2/1/2006 12:40:31 AM

Not24

Posts: 999
Joined: 12/7/2002
From: Gloucester, VA, USA
Status: offline

I appreciate all the different responses to this issue. Keep in mind that I can only fly one day per week, usually Sunday, so sorting this thing out will still take some time.

I would bet my Corvette that I am not running the engine lean on top. I have excessive smoke trail that leads me to believe that I'm actually on the rich side. I lean the engine with a tach, and have to back out more than 1/2 turn from peak to get a 200 rpm drop. Seems like the high needle has exponential. While leaning the high needle, rpm picks up very slowly till it just falls off on the lean side very rapidly. So when richening from peak, it takes quite a bit of needle travel to see a change on the tach. My OS carb on the 1.08 is sensitive to + or - 1 click on the high needle. This engine is pumped, and that made a difference. I'm thinking that pumping the 2300 might have the same effect on the needle sensitivity. Backing off the muffler pressure will reduce fuel pressure, and make the needle even less sesitive. Another fact that makes the pump look like a step in the right direction. With the pump, I can run an unrestricted exhaust, which will remove the "too much backpressure" variable from the equation.

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Post #: 30

RE: My 2300 only likes one prop - 2/1/2006 10:39:45 AM

speedster 1919

Posts: 1467
Joined: 12/17/2004
From: Martinsville, IN, USA
Status: offline

NOT24 Super tigres don't like high nitro. 0-10% SUPER TIGRES are hard to set carb by ear. They will keep running lean on high end. Some brands of engines a couple clicks lean will kill engine ,not ST . Plenty of smoke on lean means your hot burning the oil instead of spitting it out. Best luck is set HS with tach slowly find top RPM and then richen 400 RPM Make sure to hold plane straight up for 10 seconds. Low end -do pinch test adjustments less than 1/8 turn. If you turn more you will go past sweet spot sometimes. Run your 18x6 for 9,000 range. Stock muffler has enough pressure . Some pitts need one of the outlets plugged. Plugs FOX MIRICLE ,OS F ,FOX IDLE BAR, OS 8 Make sure your carb doesn't have chunk in it. I just back blew a carb out and got a plastic chunk out of line. Engine would sometimes go to 1/2 RPM struggling to get fuel. Go down to idle and then to Full RPM .

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Post #: 31

RE: My 2300 only likes one prop - 2/1/2006 10:53:19 AM

speedster 1919

Posts: 1467
Joined: 12/17/2004
From: Martinsville, IN, USA
Status: offline

1/2 turn to drop 200 RPM on HS is telling you your low speed needle is out of whack. Get your lowest reliable idle and pull fuel line. you should hear a slight RPM increase before it dies. If it runs on for more than a second your way to rich. I,ve seen some peoples engine run for 5 to 15 seconds with fuel line off and they said it was set perfect. If it dies instantly it is too lean. You always have to set HS after you set LS.

_____________________________

Hey Buddy -That was the most spectacular crash I've ever seen , That rolling cart wheel with parts slinging out was cool...

(in reply to Not24)

Post #: 32

RE: My 2300 only likes one prop - 2/1/2006 5:14:13 PM

Bax

Posts: 12451
Joined: 4/26/2002
From: Champaign, IL, USA
Status: offline

Please see our note on adjusting the carb of your SuperTigre G2300 in the SuperTigre Support Forum. You must start out with the top-end and idle set much to rich. Start at part throttle and get to full throttle. Then lean the top end first. Once it's found, you can lean the idle mixture and get the idle RPM set. Many people try to idle the engine too slowly. That can cause problems with acceleration and operation in the midrange. We consider anything below 2,500 as "good".

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Post #: 33

RE: My 2300 only likes one prop - 2/4/2006 8:49:07 PM

Not24

Posts: 999
Joined: 12/7/2002
From: Gloucester, VA, USA
Status: offline

I did some mods to my setup with the 2300. I relocated my throttle servo so I can put the tank about 2" closer to the engine. I mounted the engine inverted. I installed the stock muffler. I'm still running large fuel line, F plug, and 10% powermaster. I ran the 18-6 prop, the one that wouldn't run before.

I was seeing 9100 peak and 2600 for a reliable idle. The low needle is still very sensitive, but I believe I have it set perfectly. I can idle for 30 seconds and punch it, with only excessive smoke, but no bogging. I can also hold the model vertical at 5000 rpm without it leaning out and sagging.

I haven't flown it yet, but I believe it will do fine. I like the sound of the stock muffler better than the Bisson pitts. Spool up is lazy, but that can be fixed easily by going to a wooden prop.

The only issue I have is that fuel siphons into the carb because of tank placement. As long as I start it right away there is no problem. It may go lean on me when I fly inverted or do outside maneuvers. I had to mount the engine inverted to get the muffler to clear the engine box without hacking it up.

Now I wait for the weather to cooperate and I'll see how she does.

_____________________________

Fly it till you break it!

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Post #: 34

RE: My 2300 only likes one prop - 2/4/2006 9:29:59 PM

STG

Posts: 3498
Joined: 7/3/2003
From: New Richmond, WI, USA
Status: offline

quote:

ORIGINAL: Not24

I did some mods to my setup with the 2300. I relocated my throttle servo so I can put the tank about 2" closer to the engine. I mounted the engine inverted. I installed the stock muffler. I'm still running large fuel line, F plug, and 10% powermaster. I ran the 18-6 prop, the one that wouldn't run before.

I was seeing 9100 peak and 2600 for a reliable idle. The low needle is still very sensitive, but I believe I have it set perfectly. I can idle for 30 seconds and punch it, with only excessive smoke, but no bogging. I can also hold the model vertical at 5000 rpm without it leaning out and sagging.

I haven't flown it yet, but I believe it will do fine. I like the sound of the stock muffler better than the Bisson pitts. Spool up is lazy, but that can be fixed easily by going to a wooden prop.

The only issue I have is that fuel siphons into the carb because of tank placement. As long as I start it right away there is no problem. It may go lean on me when I fly inverted or do outside maneuvers. I had to mount the engine inverted to get the muffler to clear the engine box without hacking it up.

Now I wait for the weather to cooperate and I'll see how she does.

Consider converting your fuel tank to a uni-flow. You can do this by putting a clunk on your vent line--just make it shorter than your pick up line so you do no intake air bubbles.

9100 with APC 18x6w is very good. Should pull very hard.

< Message edited by STG -- 2/4/2006 9:30:45 PM >

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Post #: 35

RE: My 2300 only likes one prop - 2/4/2006 10:38:45 PM

buzzingb

Posts: 1511
Joined: 9/4/2002
From: Bruce, MS, USA
Status: offline

Mine would always do this a the field too, but in the air there are more variables to consider.

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Post #: 36

RE: My 2300 only likes one prop - 2/5/2006 1:20:16 AM

Not24

Posts: 999
Joined: 12/7/2002
From: Gloucester, VA, USA
Status: offline

quote:

ORIGINAL: buzzingb

Mine would always do this a the field too, but in the air there are more variables to consider.

I have made significant progress, because I did have flameouts on the ground before with that prop. Now it runs on the ground as well as any other engine. I think it will do fine.

_____________________________

Fly it till you break it!

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Post #: 37

RE: My 2300 only likes one prop - 2/5/2006 1:28:42 AM

cng

Posts: 13
Joined: 12/4/2005
From: anthem, AZ, USA
Status: offline

Nt24 did you try out your latest adjustments to the 2300? How did it fly? I have the same motor and interested on how it did.

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Post #: 38

RE: My 2300 only likes one prop - 2/5/2006 1:32:49 AM

Not24

Posts: 999
Joined: 12/7/2002
From: Gloucester, VA, USA
Status: offline

quote:

ORIGINAL: STG

Consider converting your fuel tank to a uni-flow. You can do this by putting a clunk on your vent line--just make it shorter than your pick up line so you do no intake air bubbles.

9100 with APC 18x6w is very good. Should pull very hard.

I have never heard of this before. Can you please explain this concept? With the engine inverted, fuel drips out of the carb, but it can't flood the engine because the carb is upside down. It's not necessary to prime the engine, just connect the battery and give it a few flips.

I'm using cheapo Master Airscrew classic propellers. They are a little more durable than the APC's and a lot cheaper. I will eventually go with a Pro Zinger, once I find what size I really like. I'm thinking 17-8 or 17-10. I like the good pull at lower revs with the higher pitch. Even with the 18-8 I have to drive the plane to the runway with power, when I throttle back it's like putting on the brakes.

By the way, with the cg moved fwd the plane flies really nice. The extra power makes it feel much more confident in the air. I haven't measured to find where the cg is, but it takes a little down while inverted. Landings are much more manageable. Flies like a big sport model, but d