Mark,

I know that long after sundown the tach will not work reliably in my garage. I don't fly models that late so I don't know about in the open.

I think that the fan models are different because of the number of fan blades on the fan. I don't know about the rest of it. To my knowledge, he still makes a fan model.


The TNC tach is far better than any other tach I have seen at the different flying fields I go to. I used to have a Glow Bee and the sun had to be out for it to work. You could get it to work a little darker if you had white tips on your blades and shined it at the tips.

Maybe the TNC would work in even darker conditions if you had white tips. You might be able to get a standard TNC to work on a ducted fan if you put white on two blades opposite each other?

Jim