This is the 2024 “Mk4” “E-FUSE” model of tiny single function DT timer designed by Liav Hershkoviz and Bernard Guest for free flight model airplanes. See the product video here. This new model is a total departure from the previous versions. Half the weight and size and programmable with an android phone via an app that uses the flashlight to “flash” the new program to the timer (you can program it without a phone as well …see video). I supply this timer in 3 layouts:

1. Standard Layout - timer mounted to a 3D printed mount with battery wired to the timer ($35)

2. Light - timer wired to battery but no 3D printed mount (saves you half a gram but you need to figure how to mount it ($30)

3. Ultra light - Timer and battery connected and epoxied to make a single 1g unit - install the timer into you DT line to eliminate the need for mounting a timer with springs and mousetrap etc etc. see video here could not be easier and works on any size model down to a 12” catapult glider or P-nut. ($40 because it takes more time to build this version).

The charger for this timer is $10 and simply plugs into the two tiny holes in the timer board with a friction fit to charge the battery. If you opt for the slightly heavier 40mah battery you could probably fly for the whole season on one charge (although to be safe I would charge it before each contest or once every few weeks).

Note that a fuse is 0.3g, a viscous timer with spring is 0.8g and with a mousetrap mechanism is 1.5g or heavier. The new tiny timer is only 1-1.25g depending on how it is rigged. It is now competitive with the traditional fuse DT in terms of weight and is far safer and infinitely more precise.