DT isolation latch

[SIMON BLAKE]

I’ve heard that some people use an “isolation latch” in the DT of their large Class D models and I am wondering how that works and what it looks like. I’ve been building larger models lately and I did have a couple of occasions over the summer where the DT lever popped out of the scroll, so I need to find a way to reduce stress on the timer.

[Glenn Schneider]

Simon, The isolation latch is another name for what has been known as a “mouse trap” device in the DT line. It is a second hook that is held down by a line to the timer with much reduced tension provided by the lever arm on the mouse trap hook which is hooked to the stab. There are several examples shown on the Texas Timers web site under helpful hints, you’ll get the idea. The concept was described either in the digest somewhere or on a plan or article. There may be a thread in the forum some where also. Good Luck, Thermals, Glenn

[SIMON BLAKE]

Hi Glenn,
I did search the Texas Timers site and this forum, but I couldn’t find anything. I remember reading something about it in the Digest a long time ago, but I can’t find the article. I kind of know how it works, but I wish I could see a photo.
Regards, Simon

[john thompson]

Simon . Either grommet mount the timer to provide some form of isolation or preferably use a stand alone RDT . Once you have used the RDT you will never want to go back to using a scroll. john

[Glenn Schneider]

Simon, There is a picture of a mouse trap type device on the Texas Timers web site. Go to helpful hints ( top row on the home page) and look at the line about using a badge timer on larger models. In the picture, skip the black viscous device in the center, that is where to attach the red line from the left which is attached to the timer. When the red line is released by the timer, the arm swings up and the DT line is released. Thermals, Glenn

[Glenn Schneider]

Simon, There is a picture of a mouse trap type device on the Texas Timers web site. Go to helpful hints ( top row on the home page) and look at the line about using a badge timer on larger models. In the picture, skip the black viscous device in the center, that is where to attach the red line from the left which is attached to the timer. When the red line is released by the timer, the arm swings up and the DT line is released. Thermals, Glenn

[SIMON BLAKE]

Thanks Glenn; I found it. It never occurred to me to look under badge timers — I can’t imagine using one of those on a power model although I guess some people do. There’s two different designs there and it’s pretty simple, although both would have to be beefed up substantially for a large power model. Another fellow has mailed me a sketch of what he uses, so I am looking forward to seeing that.
All the best, Simon

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