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| Gas Engines and Power Discuss all aspects of giant scale power systems |
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07-19-2006, 09:48 AM
| #1 (permalink) |
| If only you knew...    Join Date: Jan 2006 Location: Geneva, IL Age: 27
Posts: 1,795
 |  Strange Problem with DA-100
I've got a screwy problem with my DA-100. I can fly for a couple minutes with no problems whatsoever. But after about 4 minutes of flying, the motor goes to nearly idle every time I roll knife edge or do any kind of roll. I first noticed it in a snap, but when I upright the plane, the throttle response comes back. I first thought maybe the tank was screwed, but it's not the tank. I also thought maybe it was the throttle servo crapping out, but it's getting nasty. I'm on the 4th gallon of break in fuel. Really odd...The concensus is that the motor is running unbelievably rich and the motor is loading up and fouling a plug when I roll it over. Anyone hear of this before? Just for ****s and grins I looked at the needles. My low-end needle was set to almost 2 turns out and the high end needle was set to 1.5 out. Sounds rich eh? I don't know what to do. Just thought maybe some of you guys had any ideas to share with me...
__________________ Seth Arnold is my hero! Blue Skies! Mike Bargman Site Administrator www.pitsbros.com Proud Supporter of www.builtbywalt.com |
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07-19-2006, 10:00 AM
| #2 (permalink) |
| Mother Huckin'  Join Date: Jan 2006 Location: Caguas, Puerto Rico Age: 22
Posts: 3,243
|  Re: Strange Problem with DA-100
Yup sounds like a change in pressure on the carb forcing it to draw more fuel, richening it up. Carb plate should do the trick. Good luck buddy 
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07-19-2006, 10:09 AM
| #4 (permalink) |
| Shane Quale  Join Date: Mar 2006 Location: Ramstein, AB Germany Age: 27
Posts: 600
| Re: Strange Problem with DA-100
Get a hold of Shawn from RC Blimp productions. He sells the carb plates for that motor. It will solve your problem. His email is shawn@rcblimpproductions.com. Good luck. Also his website is www.rcblimpproductions.com
__________________ Shane Quale "Flip It, Fly It, Hover It, Land It" TEAM SHS www.shaneshobbyshack.com |
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07-19-2006, 10:28 AM
| #5 (permalink) |
| If only you knew... Join Date: Jan 2006 Location: Geneva, IL Age: 27
Posts: 1,795
| Re: Strange Problem with DA-100
Just ordered the Carb Plate and some extra plugs for my engine. I've also got an email in to DA since I'm at work. Thanks for the advice, guys!
__________________ Seth Arnold is my hero! Blue Skies! Mike Bargman Site Administrator www.pitsbros.com Proud Supporter of www.builtbywalt.com |
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07-19-2006, 02:17 PM
| #6 (permalink) |
| I'm Watching You!   Join Date: Jan 2006 Location: Connecticut, USA Age: 28
Posts: 7,003
| Re: Strange Problem with DA-100
That should solve your problem Mike. Your probably getting some turbulance/pressure differentiation in the cowl, causing the decrease in RPMs. My Yak would surge like crazy when I went inverted with the turbulance as the motor got more and more rich. I got a carb plate/cover, and the problem was solved. Sometimes it takes the carb plate with the line that runs inside the fuselage to get rid of that pressure change, but not always.
__________________ John Banks www.jtecrc.com www.DesertAircraft.com www.aircraftinternational.com www.3dhobbyshop.com www.rcarmour.com RC Armour Wingbags |
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07-19-2006, 02:35 PM
| #7 (permalink) |
| If only you knew... Join Date: Jan 2006 Location: Geneva, IL Age: 27
Posts: 1,795
| Re: Strange Problem with DA-100
Here's my question, though...why would it just start giving me problems with turbulent air after 20 flights with no problems? I haven't changed anything on the cowl, so why would it start now?
__________________ Seth Arnold is my hero! Blue Skies! Mike Bargman Site Administrator www.pitsbros.com Proud Supporter of www.builtbywalt.com |
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07-19-2006, 04:11 PM
| #8 (permalink) |
| I'm Watching You! Join Date: Jan 2006 Location: Connecticut, USA Age: 28
Posts: 7,003
| Re: Strange Problem with DA-100
Have you touched the needles at all recently, that could have started this change. I had a very similar issue with my ZDZ80 in my 2.6m. My throttle servo was mounted on the same beam as my fuel tank. I hadnt noticed that the bean had broken loose on one side, when I would roll inverted, the tank/beam would sag under its weight, drawing the throttle cable closed.... it too me over a month to chase that one down because I had no idea thats what was happening.
__________________ John Banks www.jtecrc.com www.DesertAircraft.com www.aircraftinternational.com www.3dhobbyshop.com www.rcarmour.com RC Armour Wingbags |
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07-19-2006, 05:32 PM
| #9 (permalink) |
| zoom zoom  | Re: Strange Problem with DA-100
The problem sounds exactly like what happened to another pilot I know. It turned out that a ring was sticking so the motor was only firing on one cylinder. This was only noticeable in KE or hover. The reason was because he was running the motor rich. DA replaced everything. 50%
__________________ Christopher Todd Vess, Spektrum, Hitec, EastRC, Donalds-Hobby, HigherPlaneProductions A democracy cannot exist as a permanent form of government. It can only exist until a majority of voters discover that they can vote themselves largess out of the public treasury. ~Alexander Tyler |
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07-20-2006, 12:14 AM
| #12 (permalink) |
| Bad-ass Super Contributer!  Join Date: Jan 2006 Location: St Peters Missouri Age: 50
Posts: 610
| Re: Strange Problem with DA-100
I know you said the tank was ok, BUT, I'm guessing that is exactly where the problem lies. Replumb it. you probably have a line with a small hole in it or the pickup line is off. Turbulence would be immediate not after 4 minutes.
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