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Author Topic: how can i build a mechanical timer ?  (Read 368 times)
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Flymam
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« on: June 30, 2017, 05:40:30 AM »

is there any way to build a mechanical timer for determalizer ?
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Balsa Ace
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« Reply #1 on: June 30, 2017, 06:52:09 AM »

This link may be helpful:

http://www.hippocketaeronautics.com/hpa_forum/index.php?topic=22178.0

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Hepcat
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« Reply #2 on: June 30, 2017, 07:10:59 AM »

Flymam.
The pictures below shew how I have made three or four timers using the clockwork parts from a Tomy toy.  They may look complicated and difficult at first but a closer look will confirm that there are really only a few simple pieces and, what is more, it is plain to see that my workmanship is very much on the rough side but they have all worked with no trouble. It is a little more complicated than others because it has the button release so the timer starts as you throw the model but I think this feature is well worth the extra work.

The only difficult part when making a timer from a Tomy mechanism is fixing the wire with the  'slow down' weights into the timer waggler. The method is to rest a heated soldering iron into the 'V' on the wire until the wire melts its way intothe waggler.  Simple in principle but it is not always easy to stop at just the right point in the melting.

I won't say more now. Just ask questions if anything is not clear.

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dephela
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« Reply #3 on: June 30, 2017, 07:17:05 AM »

There are at least a few devices to time the release that have been used. The Tomy timer, mechanics removed from small toys:
https://www.rcgroups.com/forums/showthread.php?2071709-Home-made-DT-timers/page2
http://www.gryffinaero.com/models/ffpages/tips/timer/timer.html

and silly putty timers:
http://www.gregorie.org/freeflight/silly_dt/index.html

rotary dampers are popular now:
https://www.youtube.com/watch?v=CF1lUZ0Vpfc

Personally, I don't like the tube type of silly putty timer but make a vane type similar to the Buddenbohm:
http://www.discuskid.com/buddenbohm-products.html

Dennis
!!! Hepcat, great post made while I was putting my response together,
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Dennis
Flymam
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« Reply #4 on: June 30, 2017, 08:30:28 AM »

thanks to all ..... i couldn't expect more  Smiley
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