DA100-Ran perfect until today-went rough midflight
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DA100-Ran perfect until today-went rough midflight
DA100 on my 35% aeroworks has always run great and today was no exception until the last flight. I had taken off and was at about 90% throttle, all of a sudden, it started running really rough and lost power, almost like it was on one cylinder. When I dropped the throttle, I had enough power to land and it smoothed out. Got it back on the ground and running it up anything abov about 1/3 throttle, it would cut out and run rough, anything 1/3 throttle and below smoothes out.
Could this be the ignition or a plug going bad?
If anyone can give me an idea what to check before I send this thing back to DA, I would appreciate it.
Thanks
Could this be the ignition or a plug going bad?
If anyone can give me an idea what to check before I send this thing back to DA, I would appreciate it.
Thanks
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RE: DA100-Ran perfect until today-went rough midflight
Thanks w8ye,
I just pulled the plane out of the trailer, set it up, started just like always and ran it up several times. It is running as good now as it ever has. I have not recharged or changed the ignition battery. It is a 2300 ma sub c nicad 4.8 volt.I will change out the ignition battery just to rule out that possibility.Is it possible that a bad reed could be something that comes and goes?
I just pulled the plane out of the trailer, set it up, started just like always and ran it up several times. It is running as good now as it ever has. I have not recharged or changed the ignition battery. It is a 2300 ma sub c nicad 4.8 volt.I will change out the ignition battery just to rule out that possibility.Is it possible that a bad reed could be something that comes and goes?
#4
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RE: DA100-Ran perfect until today-went rough midflight
Not usually but to en-richen the mixture will sometimes mask a minor reed problem
In cold air, our engines sometimes need to be enriched, mixture wise, because the cold air is denser.
There could be one of several different problems?
I fought this a month ago with a DLE 55. Through substitution of carbs and ignitions, it came down to the reed block. Apparently the plastic will distort after a few runs and one corner of a reed will not seat against the body or block. The reed block can usually be re-leveled and saved?
If all else fails to change performance, then look at the reeds with a light on the other side of the block to check it out?
In cold air, our engines sometimes need to be enriched, mixture wise, because the cold air is denser.
There could be one of several different problems?
I fought this a month ago with a DLE 55. Through substitution of carbs and ignitions, it came down to the reed block. Apparently the plastic will distort after a few runs and one corner of a reed will not seat against the body or block. The reed block can usually be re-leveled and saved?
If all else fails to change performance, then look at the reeds with a light on the other side of the block to check it out?
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RE: DA100-Ran perfect until today-went rough midflight
I'm predicting: "Intermittent ignition problem - may be heat related"
This has happened to me. The ignition module works for a while but after it gets to a certain temperature, one half of it starts to fail. So you get intermittent or no spark on one cylinder. Once it cools off, it runs fine again until it gets warmed up. Mine was pretty consistently around the 12 minute mark on the flight timer. Unfortunately, the only way to know for sure is to buy a new ignition system and try it out. If you've guessed wrong, you now have a spare ignition you can carry around with you.
This has happened to me. The ignition module works for a while but after it gets to a certain temperature, one half of it starts to fail. So you get intermittent or no spark on one cylinder. Once it cools off, it runs fine again until it gets warmed up. Mine was pretty consistently around the 12 minute mark on the flight timer. Unfortunately, the only way to know for sure is to buy a new ignition system and try it out. If you've guessed wrong, you now have a spare ignition you can carry around with you.
#7
RE: DA100-Ran perfect until today-went rough midflight
ORIGINAL: w8ye
The DA engines are the most popular by far at the local flying field. No one works on them, they send them back to DA.
The DA engines are the most popular by far at the local flying field. No one works on them, they send them back to DA.
#8
RE: DA100-Ran perfect until today-went rough midflight
ORIGINAL: Tony Hallo
Isn't that the truth, all other brands of engines can be repaired by the owner, DA's got to go back?
ORIGINAL: w8ye
The DA engines are the most popular by far at the local flying field. No one works on them, they send them back to DA.
The DA engines are the most popular by far at the local flying field. No one works on them, they send them back to DA.
i remember when i was much greener, i used to send off my glow engines to have the bearings replaced... it would run me about 70(2 stroke) -$90(4 stroke) ...BJ made some good money off me... not any more.... The RCU community has really helped me out... you tube as well
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RE: DA100-Ran perfect until today-went rough midflight
If I understand right, there is no repair for a bad ignition, just order a new one. Is this correct? Are there any aftermarket ignitions for the DA100 or can they only be purchased from DA?
#11
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RE: DA100-Ran perfect until today-went rough midflight
RCEXL ignition is not a direct replacement. The sensor will have to be installed differently. This usually means drilling and tapping the case up on the nose. Does the ignition have the original Sermos Power Pole connector on the voltage input side? If so that is the first thing I would look at. The wire just at the crip has a way of fracturing due to the vibration. Lots of guys replace that connector before install. I would also be looking at the battery. If that checks out, look inside your plug caps. They should be clean, any dirt should be cleaned out with alcohol. If they are loose fitting on the plug take off the metal ring and and squuze it to cloce it slightly. Look at the plugs. The gap should be about .015. Any more and the ignition may not have enough to bridge the gap.
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RE: DA100-Ran perfect until today-went rough midflight
RC EXL ignitions now come with a sensor mount that requires no drilling, the legs are slotted way longer...You have to check the magnet in the hub before you put the sensor in the bracket...the south pole of the magnet triggers the sensor..you can turn the sensor over in the bracket if the North pole is facing up...
#13
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RE: DA100-Ran perfect until today-went rough midflight
ORIGINAL: Antique
RC EXL ignitions now come with a sensor mount that requires no drilling, the legs are slotted way longer...You have to check the magnet in the hub before you put the sensor in the bracket...the south pole of the magnet triggers the sensor..you can turn the sensor over in the bracket if the North pole is facing up...
RC EXL ignitions now come with a sensor mount that requires no drilling, the legs are slotted way longer...You have to check the magnet in the hub before you put the sensor in the bracket...the south pole of the magnet triggers the sensor..you can turn the sensor over in the bracket if the North pole is facing up...
Did you get package one Ign has no timing control. Try the one that mentions hand start,has new pic 16 processor that XU L used on our ignition. I have many Pic timing boards left over.
Grumpy no ten.
BC used to be BCCHI no more.
Youll never no how little I care.
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RE: DA100-Ran perfect until today-went rough midflight
One last thing before I change ignition batteries. I've always used a 4.8 volt instead of 6.0 for ignition because I didn't want to chance cooking the ignition. Would the DA ignition do better with the 6.0 volt or should that have no bearing on the above problem. I have some NiMH 2700ma 6.0 volt batteries that I have been reluctant to attach to an ignition.
Thanks
Thanks
#16
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RE: DA100-Ran perfect until today-went rough midflight
You have to be careful here... read up on that module... some newer ones will work on 6v older ones it will fry. There should be something on the label.
ORIGINAL: flyerdave
One last thing before I change ignition batteries. I've always used a 4.8 volt instead of 6.0 for ignition because I didn't want to chance cooking the ignition. Would the DA ignition do better with the 6.0 volt or should that have no bearing on the above problem. I have some NiMH 2700ma 6.0 volt batteries that I have been reluctant to attach to an ignition.
Thanks
One last thing before I change ignition batteries. I've always used a 4.8 volt instead of 6.0 for ignition because I didn't want to chance cooking the ignition. Would the DA ignition do better with the 6.0 volt or should that have no bearing on the above problem. I have some NiMH 2700ma 6.0 volt batteries that I have been reluctant to attach to an ignition.
Thanks
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RE: DA100-Ran perfect until today-went rough midflight
I would not change the way you have your ignition set up. 4.8 volts up to 6 volts (do not use a 6 volt battery on ignition when fully charged it will go above 6 volts and can damage the ignition module)is fine, the way you have been doing it. Although it may be ignition related, I would check a couple of things first. You say that when you pulled the throttle back the engine smoothed out. Correct? If so I would check some simple things first. Here is a list I think might be of some help and also a question or 2 thrown in.
1. How old is your fuel tubing?
2. Do you use an inline filter?
3. I suspect that you might have possibly picked up some debris in the carb or the engine went lean due to temps. (I lean more toward the debris as you ran some flights before).
4. Is your clunk connected?
5. Remove the carb from the bottom of the engine and disassemble until you can see the screens. Take a magnifying glass and look at the screens. If you see a white powdery residue, the carb is dirty and needs a good cleaning. You can go to your chain saw or lawn mower shop and buy an overhaul kit for all Walboro carbs for about 7 to 15 dollars.
6. Now is a good time to replace all your fuel tubing and ensure there are no leaks between the carb and the carb block.
7. Since it is cold you might want to richen up the needles a tad. If the engine went lean and the cylinder head got too warm it will stumble.
I do not want to start a debate on oil but I have to ask what mix you are running. Notice I said mix not brand. I know a ton of guys who run 100:1 however I do not recommend it. If your comfortable with that ratio, more power to you. However if you are not flying for competition I would run 32:1 at all times.
Hope this helps. If you need more assistance let me know. I can be reached on my personal e-mail at [email protected]
Regards
Glenn Williams
1. How old is your fuel tubing?
2. Do you use an inline filter?
3. I suspect that you might have possibly picked up some debris in the carb or the engine went lean due to temps. (I lean more toward the debris as you ran some flights before).
4. Is your clunk connected?
5. Remove the carb from the bottom of the engine and disassemble until you can see the screens. Take a magnifying glass and look at the screens. If you see a white powdery residue, the carb is dirty and needs a good cleaning. You can go to your chain saw or lawn mower shop and buy an overhaul kit for all Walboro carbs for about 7 to 15 dollars.
6. Now is a good time to replace all your fuel tubing and ensure there are no leaks between the carb and the carb block.
7. Since it is cold you might want to richen up the needles a tad. If the engine went lean and the cylinder head got too warm it will stumble.
I do not want to start a debate on oil but I have to ask what mix you are running. Notice I said mix not brand. I know a ton of guys who run 100:1 however I do not recommend it. If your comfortable with that ratio, more power to you. However if you are not flying for competition I would run 32:1 at all times.
Hope this helps. If you need more assistance let me know. I can be reached on my personal e-mail at [email protected]
Regards
Glenn Williams
#19
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RE: DA100-Ran perfect until today-went rough midflight
ORIGINAL: BarracudaHockey
Inspect the tank stopper too. I had one that acted up after a few minutes, turned out it was sucking air when the tank level got below the stopper.
Inspect the tank stopper too. I had one that acted up after a few minutes, turned out it was sucking air when the tank level got below the stopper.
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RE: DA100-Ran perfect until today-went rough midflight
My idea is the same as previous posters. Looks like the fuel system went sour. Symptoms are typical for a clogged internal fuel screen, or dirty fuel admission bore (under the needle valve)
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RE: DA100-Ran perfect until today-went rough midflight
if it was a dirty screen or trash under the needle it would do it all time,not run perfect after he got it home,,sounds like a battery problem would be the best place to start,,remember most things mechanical don't come and go like you described .as for the voltage don't ever run a da ignition over about 5.2 volts,it will shorten the life span fast
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RE: DA100-Ran perfect until today-went rough midflight
Negative on that. If you have a dirty/clogged carb, it will and can cause a lean condition due to restrictted fuel flow. This will over time get worse. You will continually have to enrichen your carb to over come the screens becoming clogged. Regards Glenn Williams
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RE: DA100-Ran perfect until today-went rough midflight
I am on my i-phone and let clarify my last post. The engine will run fine with a dirty carb, until it gets some heat in the cylinders under flight loads. Once the cylinders or cylinder gets too hot the condition wll re- occur until the carb or affected fuel component is cleaned/repaired. Bottom line it sounds like the OP,s engine got too lean and stumbled inflight.
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RE: DA100-Ran perfect until today-went rough midflight
ORIGINAL: BarracudaHockey
Inspect the tank stopper too. I had one that acted up after a few minutes, turned out it was sucking air when the tank level got below the stopper.
Inspect the tank stopper too. I had one that acted up after a few minutes, turned out it was sucking air when the tank level got below the stopper.
This sounds like something good to check. perhaps with a vacuum pump and gauge. pull a vacuum on the tank and see if it leaks down. Or just change it anyway for $6.
I like the idea of a fuel starvation condition. I think a stuck reed valve would do it too. I would personally say the reed valve is less likely than tank issues or ignition issues.