sorry wrong words

i plug in the battery turn everything on and throw the switch on my tx for the opti kill to engage and i hear a pop in the head like an initial firing of the plug

I recall the Evolution engines having a note out about their engines sparking when you turn them on. Never have I heard of this on a DL, if that is the noise he is hearing. There's always a first for anything though.

Super8 thats the same thing I was wondering when I read his thread.

I use the opti kill on my engines as well so that shouldn't be the cause. Just to be sure bypass the opti kill and see if it still does it.

this is happening with it on the plug and the plug tightened into the head. i have heard of testing the ignition without a plug connected to the end cap is a NO NO due to a reverse something technical i dont recall going back to the ignition box. with it connected to the installed plug i should have no worry?

ok ill do that test next time i am at the field rain today in nevada so no planes for me today

On my buddies Eveloution 58 the noise was because either the spark plug cap was not on tight or the spark plug was loose. Not sure but I belive all electronic ignitions when turned on release a charge and that may be what you are hearing. As soon as we hear the sound of the electrical charge on his 58 we check the spark plug and cap. Hasn't happened since. Never had it happen on my DL50,

Jim

ok my steps will be for next fly day

remove and re install plug and cap
eliminate opti kill

re test for the pop

thanks all

will report back my findings when i can. work week might cause it to be next saturday though

Read this page of the thread, http://www.rcuniverse.com/forum/m_64...27/key_/tm.htm
hope this helps.

Ok, ill see if it helps me. Thanks.

I know why. It's because this ignition fires when you first power it up. I found this out while testing mine with the plug out. When you turn the ignition on it pops once. Not sure why but I feel this is a little dangerous. If it were on the compression stroke the engine could start by itself. Very rare but could happen.

Try putting a pressure tap on your carb vent and plumb it into your fuse. On another site Al Lewis shows a good picture of this on a thread. It might be the turbulants hitting this vent which effects the mixture. It can make it rich or lean depending if the vent is seeing a positive pressure or negative pressure with respect to "true atmospheric pressure".

Just a guess,but I agree. Sounds like a capacitor is holding the charge that would normally be delivered to the plug. Cutting power with the kill switch would enable this to happen. While using the throttle to kill eng would drain it. I use both systems in my gas planes but i can't say i've heard it pop. mostly use the kill switch (42%opto kill ) as a safety system in the event of signal loss to receiver, igition switch will kill engine.

huh. that is interesting. i have figured the opti kill as more a routine tool rather then an emergency. i dont recall that last time i had not used the opti kill to turn off the engine.

opto kill can function as both. you can set radio to take eng servo to fail safe, signal loss will kill engine, and you can also use the throttle cut feature on your radio. It took the loss of a finger at our club to put better safety measures in place. I like the safety restraints but there is no better proceedure than having an assistant to assist with a preflight inspection and to insure the aircraft is being restrained during all startups, and that any loose eguiptment in the immediate area doesn't become a flying projectile.

Hi,
well i sneaked out before work for a little play time. did a test of shutting down with the throttle trim. didnt hear a pop. guess im not going to worry about it.

any how, took off with my dl today with a Xoar 22x8 after a day of break in per the manual. due note this is my first 50 my other gas experience has been a crrc 26 in a tlt/peak yak and a chung yang 26 zenoah clone in a wild hare baby extra. engine is in an aero works yak sitting at about 17 and half pounds. (didnt weigh it but due to a repair using spruce i assume its on the heavier side of the aero works spektrum)

all i can say is.. yikes !! Wow !! Raped Ape !! and holy moly what have i been missing. didnt tach it. it screams to take off immediately and for me it is more then enough to go fast on take off, horizontal and vertical so im not going to worry about "fear this" rpm numbers

i love it !!

So how is the DL50 holding up with heavy usage? Has anyone logged several hundred flights with one of these?

-Ed B.

Not several hundred but one hundred and no trouble at all. Also the same original plug.
/PO

I have one with 150L gone thrue, and it's stronger than on day one
150L is about 40 gallons, thats allot more than 100 flights

I have 123 HARD flights on a BLING 3D
It has ran GREAT !!!!!
ONLY problems has been with mufflers... Broke 2 of them
before I received the new improved mufflers...

Also installing a new ignition because of ground problems...
Be sure to NOT TWIST the plug cap or you may start
loosing the ground to the ignition...

OVER ALL A BIG [sm=thumbs_up.gif]

You can't get it off without twisting it at least a little but right? It just doesn't start to come off until I twist it slightly? Is this what you're talking about? How do you do it now?

Hi Joe,
I take TWO flat head screwdrivers and pry up at the same time...
The cap will come off straight up with no twisting...
If you twist you will see the keepers on the metal cap spread and
that could lead to ground problems...

I have been told that you can use a metal automotive clamp
to hold the cap together if it loosens... Have not tried that..
Just be VERY careful with that cap !!!!!!!!!!!!!!!!

Walt...

Good to hear that these engines are holding up well.

I ordered one that will power a large plane (105") carrying a load of video equipment and other electronics.

-Ed B.

Walt, good to know. Thanks !!

Love to see photos of that setup !

Scott

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