DLE 20 & 30 ignition module
07-29-2011, 05:54 PM
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RE: DLE 20 & 30 ignition module
Jody - I just swapped in the Rxcl ignition (#3) from my DLE 20 because I was not getting a consistant spark from my DLE 30 Rcxl ignition (#4). The DLE 30 then started up fine and seemed to run smoothly, with a nice low idle. Am going to test flying tomorrow morning. Are you saying the #3 ignition should not be used with the DLE 30 engine? Am I getting less spark than I would with the #4? Thanks.
Mike
Mike
07-29-2011, 06:46 PM
#5
RE: DLE 20 & 30 ignition module
The #3 igniiton was shipped with the 30, the #4 ignition was shipped with the 20. They have different timing curves but one will work on the other. The DLE30 module will advance and retard in smaller increments at programmed points along the RPM bandto full advance at about 4000 RPM. The DLE20 module (#4) will advance and retarda full 22 degrees ar so all at one time at about 2500-2800 RPM. If you slowly advance the throttle you will hit that RPM and the engine will jump up about 800 RPM. It does the same thing on the way down so you have toset your ground idle at about 1500 to prevent the RPM from hanging up and not coming down all the way preventing you from being able to land.
If you have an ignition that doesn't spark every time the magnet passes under the sensor there's something wrong with it.
I would never fly a DLE20 with the #4 module, I don't like the way the timing makes the engine run, within a certain RPM range the RPM jumps up and down about a thousand Rs with very small throttle stick movements.
If you have an ignition that doesn't spark every time the magnet passes under the sensor there's something wrong with it.
I would never fly a DLE20 with the #4 module, I don't like the way the timing makes the engine run, within a certain RPM range the RPM jumps up and down about a thousand Rs with very small throttle stick movements.
07-29-2011, 06:57 PM
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RE: DLE 20 & 30 ignition module
Jody - you're right, my mistake - the #3 came with the DLE 30 and the #4 with the DLE 20. Thanks for the info. Sounds like I'm safe to fly the DLE 30 in the morning. Would you then recommend buying a #3 ignition for the DLE 20? Not sure if that "jump" bothers me enough to spend another $70 on it, though.
Mike
Mike
07-30-2011, 03:33 AM
#8
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RE: DLE 20 & 30 ignition module
ORIGINAL: jedijody
The #3 igniiton was shipped with the 30, the #4 ignition was shipped with the 20. They have different timing curves but one will work on the other. The DLE30 module will advance and retard in smaller increments at programmed points along the RPM band to full advance at about 4000 RPM. The DLE20 module (#4) will advance and retard a full 22 degrees ar so all at one time at about 2500-2800 RPM. If you slowly advance the throttle you will hit that RPM and the engine will jump up about 800 RPM. It does the same thing on the way down so you have to set your ground idle at about 1500 to prevent the RPM from hanging up and not coming down all the way preventing you from being able to land.
If you have an ignition that doesn't spark every time the magnet passes under the sensor there's something wrong with it.
I would never fly a DLE20 with the #4 module, I don't like the way the timing makes the engine run, within a certain RPM range the RPM jumps up and down about a thousand Rs with very small throttle stick movements.
The #3 igniiton was shipped with the 30, the #4 ignition was shipped with the 20. They have different timing curves but one will work on the other. The DLE30 module will advance and retard in smaller increments at programmed points along the RPM band to full advance at about 4000 RPM. The DLE20 module (#4) will advance and retard a full 22 degrees ar so all at one time at about 2500-2800 RPM. If you slowly advance the throttle you will hit that RPM and the engine will jump up about 800 RPM. It does the same thing on the way down so you have to set your ground idle at about 1500 to prevent the RPM from hanging up and not coming down all the way preventing you from being able to land.
If you have an ignition that doesn't spark every time the magnet passes under the sensor there's something wrong with it.
I would never fly a DLE20 with the #4 module, I don't like the way the timing makes the engine run, within a certain RPM range the RPM jumps up and down about a thousand Rs with very small throttle stick movements.
07-30-2011, 05:20 AM
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RE: DLE 20 & 30 ignition module
Just back from the field and I'm happy to report that my new DLE 30 ran beautifully with the Rcexl ignition (#4) borrowed from my DLE 20. Excellent, low idle, smooth transition to WOT. Didn't get tach numbers - will next time. I didn't notice the jump in RPM's that Jody mentioned - I'm probably not as "atuned" to that as he is. And the DLE 30 is the perfect engine for the Goldberg 73" Sukhoi 26M. VERY happy with this plane \ engine combo.
07-30-2011, 09:33 AM
#10
RE: DLE 20 & 30 ignition module
ORIGINAL: ahicks
This is the info I was trying to get a month or so ago. Glad you changed your mind about releasing it as it brings what's going on with the 20's idle into a much clearer focus. Thanks
This is the info I was trying to get a month or so ago. Glad you changed your mind about releasing it as it brings what's going on with the 20's idle into a much clearer focus. Thanks
07-30-2011, 01:46 PM
#11
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RE: DLE 20 & 30 ignition module
ORIGINAL: jedijody
I haven't changed my mind, I've posted this same information many times before, I've also explained it so many times in email that I made a Word document that I cut and paste from or just attach to an email.
ORIGINAL: ahicks
This is the info I was trying to get a month or so ago. Glad you changed your mind about releasing it as it brings what's going on with the 20's idle into a much clearer focus. Thanks
This is the info I was trying to get a month or so ago. Glad you changed your mind about releasing it as it brings what's going on with the 20's idle into a much clearer focus. Thanks
"The differences are the timing curve, advancing the timing in steps as RPM increases, that's what a curve is. Yes, I know what the curve is, no I'm not going to tell you, no you cannot change it. The DLE20 and 30 modules are timed at 35* BTDC, the standard Rcexl is timed at 28* BTDC."
http://www.rcuniverse.com/forum/m_10..._1/key_/tm.htm
07-30-2011, 03:45 PM
#12
RE: DLE 20 & 30 ignition module
Same thread, previous page, and the reason I didn't explain it there. http://www.rcuniverse.com/forum/fb.asp?m=10522308
I had told everyone how to find it out for themselves, all other questions were accurately answered as well, if not by myself by very knowledgeable people that know.
07-30-2011, 05:40 PM
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RE: DLE 20 & 30 ignition module
Thanks Jody for telling us about the #4 ignition module that comes with the dle 20. Your explanation describes accurately the erratic behavior of my dle 20 at those rpm.
07-30-2011, 06:07 PM
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RE: DLE 20 & 30 ignition module
Thanks Jodi from cphdrider also. I have the exact same RPM problem and had about lost my wits trying to figure out what was wrong and could not. Thanks again...
07-30-2011, 09:03 PM
#15
RE: DLE 20 & 30 ignition module
Unfortunately there isn't anything wrong with the ignitions that cause this condition, they're operating as they were designed. Can't bother Rcexl about it either, they're just doing as their customer wants. I noticed the the way it made the engine run right away on the preproduction prototype I was sent for testing, I explained the problem to the factory and was told the ignition I had was defective yet all the production engines have the same timing program as that first engine. In the flight video I made for the DLE20 I used a standard Rcexl ignition.
08-01-2011, 05:45 AM
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RE: DLE 20 & 30 ignition module
Replacing the #4 with CDI from the dle 55, would that improve the idling issue? Also if I did that, would I need to adjust the ignition timing? Any response from someone knowledgeable (like Jody 
) appreciated.
) appreciated.
08-01-2011, 12:09 PM
#17
RE: DLE 20 & 30 ignition module
ORIGINAL: jedijody
Unfortunately there isn't anything wrong with the ignitions that cause this condition, they're operating as they were designed. Can't bother Rcexl about it either, they're just doing as their customer wants. I noticed the the way it made the engine run right away on the preproduction prototype I was sent for testing, I explained the problem to the factory and was told the ignition I had was defective yet all the production engines have the same timing program as that first engine. In the flight videoI made for the DLE20 I used a standard Rcexl ignition.
Unfortunately there isn't anything wrong with the ignitions that cause this condition, they're operating as they were designed. Can't bother Rcexl about it either, they're just doing as their customer wants. I noticed the the way it made the engine run right away on the preproduction prototype I was sent for testing, I explained the problem to the factory and was told the ignition I had was defective yet all the production engines have the same timing program as that first engine. In the flight videoI made for the DLE20 I used a standard Rcexl ignition.
01-09-2012, 06:36 PM
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RE: DLE 20 & 30 ignition module
The advance curve on a "standard" ignition is mostly the same as the C&H it was cloned almost successfully from...
Set at 28 BTDC...Flip when starting retards it to about 2 BTDC...Mostly linear to 4000 rpm where it is at full advance until rpms drop below 4000....The creator of the syhcro spark knows exactly, maybe he will see this and explain further...
Why anyone would want to change what has been the best ignition on the planet is beyond me...
Set at 28 BTDC...Flip when starting retards it to about 2 BTDC...Mostly linear to 4000 rpm where it is at full advance until rpms drop below 4000....The creator of the syhcro spark knows exactly, maybe he will see this and explain further...
Why anyone would want to change what has been the best ignition on the planet is beyond me...
