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RE: NEW DLE 20cc Gasser! (Data & Links 1st Post) - 3/4/2011 6:50 PM   
microdon2


 

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Status: offline 		a1pcfixer - I have remote shutoff through the throttle or the choke, but I see that this Opto Kill Switch also kills the ignition in case of loss of signal. I'm convinced, and just ordered three (one for each gasser!). I feel safer already.

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RE: NEW DLE 20cc Gasser! (Data & Links 1st Post) - 3/5/2011 11:22 AM   
sandyjain


 

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quote:

ORIGINAL: Prop_Washer2

Should I get any particular brand or style..?? The RCEXL for $19.95 sounds pretty good, any other options..??


I have been using the RCexl optokill and tach on all my (4) DLE gassers for a year without any problem.

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RE: NEW DLE 20cc Gasser! (Data & Links 1st Post) - 3/7/2011 11:30 PM   
aa2dd


 

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Status: offline 		Hi guys

I have been having problems with my DL 20 doing same thing. i have messed with needle settings till i am blue in the face. when landing it will come down to what sounds like 3000 or 3500 rpm and no lower. only way i can get back on ground with much safety is to use airbrakes so it will not flare back up. after i get plane on ground and it slows to a stop, then the engine will drop to low idle. my low speed jet is about 7/8thd turn open. it has crisp instant response to throttle, off idle. hi speed is about 1.75 turn open. if i go much leaner it will sag at top of loop or sag badly if flying inverted. engine has about 2.5 gallons thru it. using pennsoil 32:1 and hitest gasoline. prop is MA 18x6. engine is a bear for power but the not returning to idle until the forward motion of the plane is a pia. landing is like a half throttle touch and go.

Bruce
aa2dd

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RE: NEW DLE 20cc Gasser! (Data & Links 1st Post) - 3/7/2011 11:55 PM   
gofast53



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From: PUKEKOHE, NEW ZEALAND
Status: offline 		I have same problem, my DLE 20 runs great on the ground from low to high but a different story when in the air. Unfortunately I learnt the hard way yesterday on a maiden flight of my Super Chipmunk, as when coming in for a landing it came in too quick, motor sounded to be idling way too fast, but I did not want to shut motor down. So went for it but ended up landing to fast and hard on one wheel causing plane to cartwheel down runway. Wing was ripped off completly with wing mount and did some damage to wing tips. I guess what did not help is that most of my previous flying experience has been with 40 size electric planes and so I did not realise that these larger scale planes have alot more weight behind them and so land at faster speeds.
Am currently rebuilding the plane and have since tested the engine on the bench and it idles fine but I am positive that during its maiden flight it was idling alot faster.

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RE: NEW DLE 20cc Gasser! (Data & Links 1st Post) - 3/8/2011 12:02 AM   
microdon2


 

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Status: offline 		Actually I've just started seeing the same problem, but only while on the ground (so far). After starting up the engine and letting it warm up for a few mins I bring it down all the way to idle but the engine does not slow below, say, 3000 or 3500 rpm. Seems that something in the carb might be getting stuck (?). What cures it - temporarily - is blipping the throttle to full, then straight down to idle - that usually lets the engine \ carb settle back down to low idle. This just started happening - I have a few gallons through it and only noticed this in the last week. Note - this plane DID crash hard about two months ago - the engine itself sounds fine - maybe the crash damaged the carb a bit? But now - from these other two stories - sounds like a systemic problem with the carb (?). Anyone else have this problem? Or a fix? Thanks.

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RE: NEW DLE 20cc Gasser! (Data & Links 1st Post) - 3/8/2011 12:07 AM   
ghoffman


 

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Status: offline 		It is too lean on the LS needle.   

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RE: NEW DLE 20cc Gasser! (Data & Links 1st Post) - 3/8/2011 12:22 AM   
jedijody



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Status: offline 		I have seen a few of the carburetors where the throttle valve screw didn't get tightened enough, the throttle valve works it's way slightly out of position and hangs up not returning completely to idle. You have to remove the carb and look into the back side with the choke open, you should not be able to see light around the throttle valve except at the idle air relief which is the little divot in the bottom of the valve next to the tiny idle fuel orifice in the carburetor throat. The other posibility is that your low needle may be a little bit to lean.

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RE: NEW DLE 20cc Gasser! (Data & Links 1st Post) - 3/8/2011 12:42 AM   
gregg660


 

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Status: offline 		See posts around 885 page 36. I found it on a search for timing..and wala, it discribed what was happening. Idle would go to normal after about 30 seconds or blipping. I am seeing this too, and have not had a chance to redo the needles. Makes perfect sense. I beleive I've done just that..leaning the low end too much to get that perfect idle. May have a chance to play with it after work tomorrow. Oh yeah..temperatures have gone up a bit around since needles were set by some of yas??

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RE: NEW DLE 20cc Gasser! (Data & Links 1st Post) - 3/8/2011 12:51 AM   
microdon2


 

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Status: offline 		Thanks for the answers - I'll try richening the LSN.

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RE: NEW DLE 20cc Gasser! (Data & Links 1st Post) - 3/8/2011 1:43 AM   
Antique



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Status: offline 		Try a Version 1 ignition or a C&H, with or without EI....The version 4 excel ignition is weird....

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RE: NEW DLE 20cc Gasser! (Data & Links 1st Post) - 3/8/2011 1:57 AM   
jedijody



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Status: offline 		I agree.

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RE: NEW DLE 20cc Gasser! (Data & Links 1st Post) - 3/8/2011 2:13 AM   
microdon2


 

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Status: offline 		Antique \ Jedijody -

Are you saying this high-idle problem may be caused by this version (4?) of the Rcexl ignition? Are there other problems that warrent buying a new EI? So far this is the only issue I've seen, and the first time hearing of a recommendation to get a different EI for this engine. And, if so, where can we find this version 1? I didn't see any other versions on the Rcexl site.

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RE: NEW DLE 20cc Gasser! (Data & Links 1st Post) - 3/8/2011 6:17 AM   
Jonde


 

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Status: offline 		Hi Guys

I finally got my new DLE 20cc engine.  Are most of you using the recommended Dubro anti vibration mount?  Could I use Great Planes adjustable composite mount in the 1.08-1.8 size?  I do not remember seeing any information on this in the earlier discussions, unless I missed it.  For you experienced gassers, how critical is the vibration issue? 

Thanks in advance,

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RE: NEW DLE 20cc Gasser! (Data & Links 1st Post) - 3/8/2011 6:36 AM   
jedijody



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Status: offline 		Many of you may not like hearing this but it's the truth, the main reason for the special timing in the DLE20 and DLE30 modules is to get them to idle at ridiculous and unnecessarily low RPMs. I believe it was done due to many users being new to gas and inexperienced at tuning small, or even tiny gas engines and not having the patience or experience needed to properly tune a gas engine. The special timing allows even a poorly tuned engine to idle at 1500 RPM.

For some time now the modules have not been acting like the original ones did, instead of advancing the timing in 4 or 5 increments they will dump all the advance in at once at about 2500 RPM, the RPM then jumps about 500 RPM like you flipped a switch. Conversely it does the same thing only dropping 500 RPM coming down on the throttle at about 3000 RPM. 3000 RPM is hardly a landing speed so I doubt this is causing the problem but it's possible. Also, the RPM doesn't just hang there and come down slowly on it's own, when you pass the threshold RPM, the timing and RPM changes instantly by about 22 degrees and 500 RPM.

The problem for the user, if this is what's causing the problem, is that it's exactly what it's it is supposed to do, there's nothing wrong with it, there's no warranty problem, it's made that way, don't ask me why. Personally I prefer the standard Rcexl module on both the DLE20 and DLE30, with a little patience and know how it's very easy to make them run at 1700 RPM and sometimes less.

Check the tune on your low needles and check the throttle valve position and screw tightness, set your landing idle at 1800 or less on the ground and the timing cannot be a factor in the engine not coming down to idle. If you use a flying idle setting (you should) don't forget to lower it back to the ground idle speed on your down wind leg. Lastly, the engine doesn't know if it's flying or whether the spark plug is pointing to the sky or the ground, heading straight up or straight down, or sitting on the edge of the runway. If the engine runs like a top on the ground yet acts up in the air, there is nothing wrong with it, the problem is not the engine it's either tuning, air flow, fuel system,  or something else in the plane.

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RE: NEW DLE 20cc Gasser! (Data & Links 1st Post) - 3/8/2011 8:03 AM   
Antique



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The early Reichmuth 2 sensor ignitions were kinda like this, there was a step just when you didn't want it, coming in for landing..

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RE: NEW DLE 20cc Gasser! (Data & Links 1st Post) - 3/8/2011 8:57 AM   
a1pcfixer



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quote:

ORIGINAL: gregg660

See posts around 885 page 36.



Yep, and for aa2dd(Bruce), gofast, microdon2, and others, here it is;

quote:

ORIGINAL: ahicks

The reason it won't come back down onto the idle right away is it's hot. A slightly richer low mixture will let it cool down quicker, like maybe as soon as you close the throttle. Blipping the throttle blows extra fuel and air through the combustion chamber cooling it down. If you could hit the choke for an instant, it would do the same thing.

That really low smooth idle is proof it's too lean. If it's right, it should have a slightly unsteady idle. Hard to describe....


Plus my response back then;

quote:

ORIGINAL: a1pcfixer

W8YE/Jim,

Excellent tuning tips!
Obviously I need to work on my LS needle settings.

I'd add the following to your routine;
You'll know when your LS needle settings are too lean, when it's tough getting it started!

It's too lean on HS when it flames-out (no amount of excessive oil/fuel mix will protect those).

One &/or both are not right when it stumbles transistioning between low & high.


So, try the above first, before changing out the ign module, or messing with the throttle plate.
IF a proper setting of your mix screws doesn't cure it first, THEN try the other ideas.

Do one thing and check your results. Do NOT try several things at the same time, as you won't know which one fixed it.

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Learn from the mistakes of others.You won,t live long enough to make all of them yourself.

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RE: NEW DLE 20cc Gasser! (Data & Links 1st Post) - 3/8/2011 1:35 PM   
gregg660


 

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Status: offline 		Good info on the timing Jodi..thanks. So, when all said and done, run at full for 45 seconds or so after you think you got her, come to quick idle and if it doesnt repond for a bit, it's too lean on the low in a nut shell..wow. Was driving me nuts with my idle down settings, wasn't dying..reponse good.... thought of linkage issues..timing..yada yada..but she came down after a bit..learning is good.
Thanks guys. I'll report back as I get a chance to start fresh with the needles with this in mind.
Greggg (Gas N Go)

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RE: NEW DLE 20cc Gasser! (Data & Links 1st Post) - 3/8/2011 5:57 PM   
jstanton



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Status: offline 		I just finished my second project with a DLE-20. It is a seagull AT-6 75. It weighs in at 10.5 lbs and I am using an SY 16x8 prop. Should do very nicely Here are a few pics. I won't be able to do the maiden fro a while becasue i have to go help my daughter recover from surgery next week and watch the grandkids.

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RE: NEW DLE 20cc Gasser! (Data & Links 1st Post) - 3/8/2011 6:16 PM   
rrengineer



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Status: offline 		I notice you have twins as pilots. Heck they even dress the same! ;^)
Mike MacLean

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RE: NEW DLE 20cc Gasser! (Data & Links 1st Post) - 3/8/2011 7:36 PM   
jstanton



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Status: offline 		Yes you are right and my wife said the same thing! They are Darrell & his other brother Darrell!

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RE: NEW DLE 20cc Gasser! (Data & Links 1st Post) - 3/8/2011 7:42 PM   
Jonde


 

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Status: offline 		jstanton

Nice build on the AT-6.  Did you use a silver heat shinkable covering or is it painted?  What engine mount did you use? 

Jon

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RE: NEW DLE 20cc Gasser! (Data & Links 1st Post) - 3/8/2011 7:45 PM   
jstanton



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Status: offline 		The covering that came on the plane is Ultracote and I used the stock engine mount that came with the plane. I have also built a GP PT-17 with a DLE-20 and I used the stock engine mount with it also and it has held up very well

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RE: NEW DLE 20cc Gasser! (Data & Links 1st Post) - 3/8/2011 9:56 PM   
microdon2


 

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Status: offline 		So I opened my DLE 20's LS carb adjustment a bit last night - maybe 1/8 - before screwing the cowl back on my 70" Revolver. Just a guess. This morning went to the field using an APC 15x12. The engine seemed to run well, though finding the right low end throttle setting was tricky - one click up and I'm reving at 1,900-2,000. It would run at 1,700, but then would stall after landing, on roll out. I did eventually find 1,800. The tack readings were about 17-1800 up to 7,900-8,000. The engine sounded smooth in the air - no gurgling. Then I tried an APC 16x7 and the engine gurgled noticeably in the air. Is this typical? I hate to do it, but think I might have to drill a hole in this cowl to get access to the LS and HS adjustments. Is it typical to have to change adjustments when you change prop size?

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RE: NEW DLE 20cc Gasser! (Data & Links 1st Post) - 3/8/2011 10:20 PM   
airborne2.4


 

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quote:

Is it typical to have to change adjustments when you change prop size?


Yep, I think it is.

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RE: NEW DLE 20cc Gasser! (Data & Links 1st Post) - 3/8/2011 10:32 PM   
w8ye



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Status: offline 		Also with some prop sizes you may have a midrange gurgle not tune out with the needles


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