I found that a thin 2.5in. rubber band stretched to 5in. when you hook the line (braided cotton) on to the timer, right, provides enough pull for a positive release which is, of course, essential. My workshop experiment, at 60deg F, worked out like this:
1 Turn = 50sec, 2 T = 1:22, 3 T = 2:05, 4 T = 3.28.
Silly Putty Tube-in-a-Tube DT Timer
Peter Michel wrote:
Following a piece in May '07’s “1066 New Clarion” about silly putty DT timers John (“Gadgets”) Worsley has sent me the latest gen on the subject. It is fascinating stuff and I rushed out to the workshop to try it for myself.
The basic idea comes from the newsletter of the Scale Staffel Model Airplane Club of San Diego whose members were concerned with the possibility of fuse DTs causing fire storms in tinder-dry areas – and as we all know,
Many years ago there was a breakthrough in Vintage Rubber with the invention of the tube-in-a-tube freewheel prop assembly. Now we have the tube-in-a-tube DT timer which costs next to nothing and weighs next to nothing (1.3gm.), I think you will agree, it is as neat as ninepence.