I read about these in a British R/C mag a while ago.

Apparently the driver unit includes a microprocessor which monitors plug condition and applies current when the plug is in danger of going out, not just at a predetermined throttle position.

Has anyone tried one of these? Are they any good? Any downsides (besides extra cost) as compared to normal electrically switched glow driver (i.e. glow-lite, McDaniel etc)?

If they are a real improvement, where can you buy them, and how much do they cost? I would like to get one if they are worth it.

Comments from those who have actual experience with the "intelligent" driver I am referring to would be appreciated.

We use these almost exclusively for starting our Q-500 and Q-40 racing engines (when the timer is running, it really helps to have a
good hot plug). They aren't cheap ($65-75) but I find myself using it when ever I can, as long as I'm not starting an in-cowl engine where I need the extension to reach the plug. Thet really do work! If your engine becomes a bit flooded, the driver senses the impedence change and boosts the amperage to keep the glow element hot. They are wonderful tools!

Here is one place to get them....but don't think they are for racing only.

http://www.darrolcady.com/Accessorie...Pro-driver-pic

I have one. They are available from www.Nelsonhobby.com. I do not have air time on it. I have taken my Saito 180 out of one airplane and bench mounted the motor. I hooked up the receiver and throttel servo plus a Y connector to the glow driver. You " teach " the glow driver where the end points are on the servo travel, you do this from the transmitter. Thats it, the glow driver feeds the glow plug a couple clicks above engine shut off, your decesion on where it ingages. Ran a tank of gas and watched it do its thing. I like it. If you need onboard ignitation its a good way to go. Like I said not yet in an airplane but ground testing passed.
tonyc

Thanks for your help Guys.

The on board unit is what I am looking for. Sounds like a good package. I too need one for a large 4 stroke where the possibility of unexpected flame-outs must be minimised.

Be careful of whatever else you may find in there!