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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, California has had a number of major bush fires in recent years. So, one club member came up with the tube-in-a-tube timer which is basically a greatly improved version of the well-known button timer.

Tube-in-a-Tube DT Timer
Tube-in-a-Tube DT Timer

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.

Read all about this little masterpiece from the pen of Peter Michel himself here with credit to John Worsley and the Scale Staffel Model Airplane Club of San Diego.

Ramon Alban

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