I think you are missing my point,, and yes I have many friends that manual choke.. I use my choke servo to start my plane instead of manually turning on and off the choke, and I use it as a secondary means to kill the engine if necessary. Nothing jury-rigged about it.
In the future I will install an optical kill linked to the RX which will kill the engine if the RX looses power, redundancy is a good thing in large planes, but I will always have my choke servo. I guess I don't like bending down more than I have to

Ralph

I have both a choke servo and a FO KILL..

No Ralph I did not miss the point.

Redundancy is always a good idea for critical functions.

Bill

Here are my reasons for using what I use:

The two ways to kill an engine's spark with the TX: Servo actuated switch and FO Kill switch. Third option to kill motor, choke.

1) Servo operated kill switch
--- adds a second switch in series with the manual switch to fail... more likely to have problems
--- servo will most likely be up front near the switch... don't like ot have RX electronics within 12" of IGN electronics

2) FO Kill Switch - I had one of these
--- Another part to fail in series with the ignition switch
--- A second part to fail near the RX (the LED side)
--- FO cables to come loose
--- A temporary glitch can kill the motor
--- Failure most likely identified in flight when motor quits
--- If using 2 RXs in a large airplane and the RX the FO kill is on dies, the motor dies with it greatly reducing the chances of recovering the airplane.

3) Choke servo
--- Servo is back near the RX with Precision Rod runnig to the choke
--- Don't have to reach through prop when starting
--- Failure most likely identified when starting. Failure in the air most like will not kill motor... will notice at next start
--- No additional electronics in series with ignition wiring
--- If one RX dies in a 2 RX installation, you are left with either the choke or the throttle... the motor will keep running if either RX dies. In one case you are stuck with whatever thrust you had selected (better than nothing), and in the other you retain full throttle control. Of course, if the throttle RX locks out (as opposed to power failure), then you are stuck with your failsafe idle power (required in most places now).

Wings,

Yes, from the transmitter, not manually. I use a separate servo on a [link=http://www2.towerhobbies.com/cgi-bin/wti0001p?&I=LXJ776&P=ML]Great Planes kill switch[/link]. This also has a manual switch if you want to do it manually, or for extra protection against accidental starts.

Ciprian..
Read the thread again, then come back.
This thread is not about the best way to kill an engine. It is about the merits of using the choke to kill the engine.

I used the choke to shut down my ZDZ 50NG while it was at idle one time, it made the engine very hard to start the next time. I had to remove the sparkplug and prop it over to clear the raw fuel from the cylinder.

I have a Smart Fly ignition cut off. This allows me to kill the engine by turning off the ignition power with a switch from the transmitter. I think an ignition cut off is a must for big airplanes because of safety, If the receiver lost its power (battery or switch failure) this immediately kills the engine. Nothing worst than a big airplane at full throttle without any control. I also use always PCM that brings the engine to idle in case of any interference.
For me with the size of these planes safety always comes first.
Andres

Which only shows all engines are not alike. Hence the many opinions.

I have used a choke servo to kill Da's and my mvvs and have not had a single issue with either one of these engines.

If, for any reason, you flood your engine, you can do the following to clear the engine.

Ignition OFF, Choke OFF, FULL throttle, flip it over 8 or 10 times.

Close throttle to idle, Ignition on, try to start. You may need to re-choke it.

A lot easier than pulling plugs.

I did that prior to pulling the plug and the engine still wouldn't start. I learned that it is best with my ZDZ to not shut down the engine with the choke because it is easier to start on the next flight. I believe that the thread topic is about using the choke to shut down the engine.

Hi folks: Some time ago I mentioned a good way to keep your 2 cycle gas engines running good is to rev them up and throw the choke on. This floods the engie out and protects all parts inside with exta oil. Yo do this on very last flight of the day or any engine you want to lube up. It keeps the seals soft also. Carbon build-up to my supprize was not a problem. It seems the carbon is keep soft and blows out on start up. I have been doing this for twenty years on my engines. Works great. The guys that have tried it agree. This is not a way too shut down engine...except for the last run of the day. Although snomobile engines several hours later will start right up without choke. My Snomobile that I did this with...was the fastest stock one in my area. Also I have a reed valve 4.2 chainsaw that runs perfect to this day. Never had ot do anything. Seals stay like they should...pliable. Try it....see for yourself. Thanks Capt,n

Just trying to help out. Forgive me.

FWIW... I found my ZDZ-80 to be rather erratic when it came to start characteristics... one day great, the next very hard to start, with nothing changing in between days. If it got flooded on one of the endless flipping day then the quoted technique worked very well. I'm much happier with my new motor... never had an issue starting.

I normally kill my engines with throttle, but I have a choke as an emergency back-up... I do not use it on a regular basis other than for engine starting.

preivers,

I did not mean to step on anybody's toes here. All I see is some people saying that it is good to shut them off this way while others say it isn't. All I was asking was why all of these, when it is much elegant to kill the spark. This does not cut the fuel off and hence the oil. The only merit of killing the engine with the choke that I can see, is redundancy. You can use it when the ignition kill failed, which BTW never happened to me. Like I said, I am new to gas planes, but I used chain saws and weed eaters for years. I never shut them down with the choke, not on the first, not on the last run of the day, and I still have to destroy one yet.
Enough said, time to move on..

Hmm, My toes are not sore. The kill switch option was just off topic.
I have a kill switch only, and wet the engine with the choke when I get home.

Once I had to shut off my Fuji 64 with the choke after the kill switch ground wire failed. Since the engine is inverted in my plane, the plug was too wet to fire when I tried to start it after repairing the wire. One downside to choke to kill that I've seen in weedeaters and other small two strokes is varnish build up when stored over a long time. It usually doesn't hurt anything, but the bearings and piston can become a little sticky if overwintered with a great deal of fuel in the crankcase. The rev and choke to kill might cause premature failure of the metering diaphragm in some carbs, due to sudden high vacuum conditions in the carb throat.
I prefer to just use the kill switch. For me its easier, since mine has a manual choke which puts my hand very close to a big prop. I also figure I'll get a little more life from the plug before fouling.