I know I have posted this before
But I still have an entrust in doing an electric powered free flight model airplane. I have looked high and low for a count-down timing device for an electric powered free flight model and nobody sells such a thing
I have owned several wrist watches that were very light that had this feature. I am not very well schooled in electronics," but who is?"
When you buy the latest computer or cell phone the newer and improved models are being unloaded off the trucks at the back of the store
The world of electronics is changing so fast I don't think anybody can keep up with it all
However it seems to me that an adjustable count-down timer for a brushless electric motor powered system could be easy to designed and manufactured for free flight model airplanes. But why doesn't anyone produce such a thing
A small light weight brushless DC electric motor with a Li-Po battery power source and a electronic speed controller would make for some fun free flight model airplane builds. So why doesn't any manufacture make a timing device for free flight model airplane builders
With such a device building a free flight model airplane could be so versatile, you could adjust the run time of the electric brushless motor to fit the size of the flying field and could build a much lighter model. This would create a whole new class of free flight model airplane building
and it would be fun thing to do
Why doesn't a company (like the Timex digital watch company) make such a device
The company that would make such a count-down timing device for model airplane builders could sponsor a free flight contest to promote their other products
Of course such a device could be used by some "kooky terrorist group" to hurt a lot of innocent folks, but they,"the kooky terrorist groups", are already doing this sort of thing. I am sure if you gave one of these, "kooky terrorist groups", a tube of toothpaste they could come up with a way to cause harm. So why can't I, "who is of no threat to anybody", have an adjustable count-down timing device for making my hobby of building and flying model airplanes a little more fun? I don't understand why such a device isn't available for building a power system for model aviation
WOW! that was something I should have been thinking about the whole time 
Start with the simplest builds and work my up to the more advanced building projects. I wish I knew more about computers too 
but I don't 
I was very impressed to say the least 