Without really any expierence I'm thinking low RPM isn't going to be that low or the airplane will fall out of the air. Idle bar plugs work pretty good and think an on-board glow driver may be a solution to a non existing problem.

Well I didn't expect to flying around at idle...
But flame-outs could be prevented by this - RPM changes maintaining slow flight is where you could get in trouble, especially with little backpressure of an open exhaust.

Hmmm. Remember when old Duke Fox came out with the two glow plug heads. For speed I think.

Before factory mufflers and the Noise Nazis of the 70's, throttle-linked exhaust baffles were used to smooth out the throttle response of R/C engines. Idle bar glow plugs too. They are good and light but a glow driver would be dead reliable.

The glow powered carrier planes use a 3 line system with a special bellcrank. It is all mechanical with a linkage to the throttle on the motor. In RC a servo is used to adjust the throttle, in carrier its the action of the third line.

There are now some electric powered carrier planes (electric motors not glow motors) and they still use the 3 line system but the throttle linkage goes to a rotary potentiometer that changes the pulses out of the electric speed control for the motor. The engine speed is dictated by the pulses out of the speed control to the motor.

Generally if there is a flame out during low speed it is most like due to a bad needle setting that is either too lean or too rich. If it's on the lean side the engine overheats. If it is on the rich side it loads up during low speed and stalls out. I am not sure an onboard glow driver would really help.

I was refering to the R/C and C/L fields being shut down and run out of town due to noise issues. Attack of the NIMBY's. The days of flying in a City park are almost over. They don't want the liability.
Not my intention to go off on a 

(NIMBY = (Not In My Back Yard)

Are electronic throttles AKA Clancy Arnold setups allowed in carrier?

 

Are electronic throttles AKA Clancy Arnold setups allowed in carrier?

 

Yes Clancy's unit would be legal but would require insulated lines if the potentiometer that controls speed is on the handle. Generally the insulated lines are much larger diameter than standard lines and they would be a big disadvantage (although you only have 2 instead of three lines). You would also need a servo and power source for the servo mounted on the plane to drive the throttle arm on the motor.

Yes Clancy's unit would be legal but would require insulated lines if the potentiometer that controls speed is on the handle. Generally the insulated lines are much larger diameter than standard lines and they would be a big disadvantage (although you only have 2 instead of three lines). You would also need a servo and power source for the servo mounted on the plane to drive the throttle arm on the motor.

Like I said before I am not into carrier so I am on the sideline stirring the pot 

If you are not looping and start with untwisted lines I am not sure you need insulated lines.  Also servos, Li-Po battries and the like have gotten very light.  replace the wing tip weight with the battery.  The advantage of electronic controll is lots of mussel to controll throttle, tail hook and flaps.  One small servo could do it all.  Also if the lines go slack you still have throttle controll.

As I said just stirring the pot.   

Like I said before I am not into carrier so I am on the sideline stirring the pot 

If you are not looping and start with untwisted lines I am not sure you need insulated lines.  Also servos, Li-Po battries and the like have gotten very light.  replace the wing tip weight with the battery.  The advantage of electronic controll is lots of mussel to controll throttle, tail hook and flaps.  One small servo could do it all.  Also if the lines go slack you still have throttle controll.

As I said just stirring the pot.   

There are a couple of reasons why un-insulated wouldn't fly:

1) Probability that lines touch when picking up handle. Motor could turn off.
2) Plane flips over in low speed flight, lines touch---where does motor go?

I think this pot doesn't need stirring.

I can attest that one insulated line will NOT work - if the two lines have significantly different diameters, they will have significantly different drag.  It is the same as hanging a parachute half way out on one line.  The very first time I tried an electronic throttle, I retrofitted a system to an existing (2-line) plane, using an added 30 ga. wire for the signal and the existing line(s) for the return.  I wrapped the 30 ga. around the rear (up) line and proceeded to take off and fly. As I accelerated, I had to hold full down elevator and at full speed, I was literally flying on just the down line, with my fist pointed straight down and my hand down between my knees.  It finally occurred to me that I had throttle control, so I slowed the engine and was able to fly slow almost normally. I hadn't thought it out in advance, but in the air it was quite obvious that the rear/up line was bowed quite a bit more than the down line.

(This is the same reason that the throttle bellcrank arm moves twice as far as the elevator bellcrank in a J-Roberts or other 3-line system - the double drag of the elevator lines is only operating on a lever that is half the length of the throttle lever, so the drags balance each other)

As to the rest of the above - throttles operated by servos have been done in Carrier, glow drivers have been used in Carrier (a C-cell Nicad works very well), flaps-hook-rudder-aileron moving in flight have all been done.  I don't see any suggestions that actually push the envelope and what I have come to realize is that simpler is better, at least for me.  Others mileage may vary .....

I can attest that one insulated line will NOT work - if the two lines have significantly different diameters, they will have significantly different drag.  It is the same as hanging a parachute half way out on one line.  The very first time I tried an electronic throttle, I retrofitted a system to an existing (2-line) plane, using an added 30 ga. wire for the signal and the existing line(s) for the return.  I wrapped the 30 ga. around the rear (up) line and proceeded to take off and fly. As I accelerated, I had to hold full down elevator and at full speed, I was literally flying on just the down line, with my fist pointed straight down and my hand down between my knees.  It finally occurred to me that I had throttle control, so I slowed the engine and was able to fly slow almost normally. I hadn't thought it out in advance, but in the air it was quite obvious that the rear/up line was bowed quite a bit more than the down line.

(This is the same reason that the throttle bellcrank arm moves twice as far as the elevator bellcrank in a J-Roberts or other 3-line system - the double drag of the elevator lines is only operating on a lever that is half the length of the throttle lever, so the drags balance each other)

As to the rest of the above - throttles operated by servos have been done in Carrier, glow drivers have been used in Carrier (a C-cell Nicad works very well), flaps-hook-rudder-aileron moving in flight have all been done.  I don't see any suggestions that actually push the envelope and what I have come to realize is that simpler is better, at least for me.  Others mileage may vary .....

Mike,
I had the same experiance on my scale Extra 300S only I managed to crash it. You really do need two insulated lines to ballance the drag. looks like, all in all, electric throttle, flaps etc isn't the best for carrier.