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Wing Things- DT's, Timers etc.
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DT (Read 13746 times)
Z-man
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If it flies, it's awesome!
Posts: 22
Location: Jonesborough, TN
Joined: Aug 10
th
, 2020
Re: DT
Reply #15 -
Sep 24
th
, 2020 at 1:45pm
Print Post
I've been curious about how to make a mechanical DT and will revive and old thread to share what I have found.
I was browsing YouTube and found an interesting video on this:
https://www.youtube.com/watch?v=6Pv1CLggmVk&ab_channel=SDGG2
When I got looking further I found that the mechanical timer is light and relatively cheap (~$9.00). It appears (based on the video) that it can be modified with a simple shaft inserted in the gear...
The following are links to suppliers I have found:
https://www.acecontrols.com/us/products/motion-control/rotary-dampers/frt-c2-and...
https://www.grainger.com/search?searchQuery=FRT+C2+301+G1&s_kwcid=AL!2966!10!794...
I'm going to get some of these and experiment with them, and maybe others will find these useful, too.
Cheers!
Scott Z
( 76 KB | 59 Downloads )
Life's a journey, enjoy the flight
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bigrip74
Ex Member
Re: DT
Reply #14 -
Oct 15
th
, 2016 at 9:21pm
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Wow! Lots of knowledgeable people here, I may be able to build one of the silly putty DT with all of the diagrams.
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Sky9pilot
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Stick & Tissue
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Location: Kelso, WA 98626 USA
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th
, 2010
Re: DT
Reply #13 -
Oct 15
th
, 2016 at 8:08pm
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Here's a link to some DT's and how to make them on the RCGroups site:
Click Here
Here's another link to our Articles section that has articles on Silly Putty Dethermalizers and "how to" build them.
Click Here
Tom
If God is your Co-pilot...switch seats...
Your attitude will determine your altitude!- John Maxwell
And ye shall know the truth, and the truth shall set you free. Jn 8:32
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terryman
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th
, 2013
Re: DT
Reply #12 -
Oct 15
th
, 2016 at 7:24pm
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Here is a document on building a Silly Putty dethermalizer. I built one, it worked. Also some discussion of one here:
http://www.stickandtissue.com/cgi-bin/yabb2/YaBB.pl?num=1443749404/55
Read several replies before and after.
If I were to make another I would use a Tommy Timer instead.
Terry
DethermalizerTube.pdf
( 291 KB | 84 Downloads )
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pb_guy
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So I'm just a kid at heart.
Posts: 1957
Location: Youbou, BC, Vancouver Island
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th
, 2014
Re: DT
Reply #11 -
Oct 15
th
, 2016 at 10:25am
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I think that the way of the future is electronic dethermalizers. There are already some on the market. The problem is not weight, but price.
see:
http://www.hippocketaeronautics.com/hpa_forum/index.php?topic=20894.0
ian
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bigrip74
Ex Member
Re: DT
Reply #10 -
Oct 15
th
, 2016 at 8:18am
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balsafliesbetter wrote
on Oct 15
th
, 2016 at 2:24am:
Breathing life into this 5yo thread.
I am completely new to ff and would love to see/read more details about dt. Especially the silly putty idea.
"DITTO"
I also would like to see this re: silly putty. I have a formula to make home made silly putty.
Bob
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balsafliesbetter
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Location: Ogden utah
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th
, 2016
Re: DT
Reply #9 -
Oct 15
th
, 2016 at 2:24am
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Breathing life into this 5yo thread.
I am completely new to ff and would love to see/read more details about dt. Especially the silly putty idea.
Life's Too Short.. Just Build it, and Damn The Critics!
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DickA
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Stick & Tissue
Posts: 7
Joined: Jan 10
th
, 2010
Re: DT
Reply #8 -
Dec 14
th
, 2011 at 10:53am
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Thanks for the demo and explanations. Have a basic question... where do you get the fuse?
DickA
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thymekiller
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Stick & Tissue
Posts: 3275
Location: Missouri
Joined: Jun 14
th
, 2008
Re: DT
Reply #7 -
Jul 21
st
, 2011 at 5:52am
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Thank you Ziess. I hope to have time this weekend to chase those links and a couple others.
Thanks.
",,,The road goes on forever, and the party never ends..."
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Zeiss Ikon
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Stick & Tissue
Posts: 35
Location: North Carolina, USA
Joined: Jul 3
rd
, 2011
Re: DT
Reply #6 -
Jul 20
th
, 2011 at 7:46pm
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Thyme, the Silly Putty does "grease" the tube in tube, but because of the extremely high viscosity, it acts as more of a damper than a lubricant. If you've never played with the stuff, by all means find the nearest toy or craft store and get an egg -- be sure to get the "original", not any of the kinds that glow or glitter; the stuff inside the egg should be pinkish, almost the color of a "flesh" Crayola.
Here's the
build sequence
for my first Silly Putty timer. Here's a link to the
improvements I made in the second one
.
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thymekiller
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Stick & Tissue
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th
, 2008
Re: DT
Reply #5 -
Jul 18
th
, 2011 at 9:06pm
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Was digging thu old threads and found this link from Papa.
http://www.vintagemodelairplane.com/pages/Downloads/CRB_Tasters/SillyPutty01.htm...
",,,The road goes on forever, and the party never ends..."
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thymekiller
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Stick & Tissue
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th
, 2008
Re: DT
Reply #4 -
Jul 18
th
, 2011 at 8:34pm
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Did a vid of my fuse type dt. There are many refinements that can be added.
The snuffer tube is also the rear peg.
http://www.youtube.com/watch?v=i_4MA1YKnro
Ziess, I am aware of how a shock absorber works and I am trying to translate that to a circle motion [instead of straight in and out] and I am having trouble with it. In my limited mind i can only see a tube in a tube and the silly putty would only serve to grease it. Also of note here is that I have never played with silly putty in my life. Maybe I should get some.
If you wouldn't mind, a build sequence would be fantastic or maybe a link. Sorry to bother you with this. This is the first time for me and I am lost. One of the things I enjoy most about this hobby is that there is always another corner to go around.
",,,The road goes on forever, and the party never ends..."
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Zeiss Ikon
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Stick & Tissue
Posts: 35
Location: North Carolina, USA
Joined: Jul 3
rd
, 2011
Re: DT
Reply #3 -
Jul 18
th
, 2011 at 3:46pm
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A Silly Putty timer consists of Silly Putty inside a tube, with either a perforated tube or (tiny) paddle on a wire embedded in the Putty (there are more details to it than that; I can post a construction photo sequence if needed); the inner wire or tube is rotated by a string wrapped around, which is driven by a spring (like the rotary damper video you linked) or elastic. The damping effect of the Silly Putty on the perfed tube or paddle causes the tension to rotate the core
very slowly
-- my last one does about two minutes for 135º of rotation, driven by a single office type rubber band stretched about double length.
The rest of the setup is the same you'd have with the rotary damper -- some way to let the tension on the drive line hold a flying surface in place, then release it promptly when the tension loop slips off the drive arm, producing the same effect you'd get with a fuse burning through a thin rubber band.
The advantage of Silly Putty over commercial dampers is price -- I spent about $10 on tubing and an egg of putty, added some super glue and bamboo skewers I had around, and have everything I need to make a dozen or more timers; that's less than 1/3 the price of the commercial dampers, and my timers can be customized -- make the tube longer, you get more damping, and the timer runs slower on a given tension. I could easily make a Silly Putty timer that would run five minutes or more for a 270º rotation, still with a tensioner strong enough to lock a pretty robust DT mechanism...
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thymekiller
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Stick & Tissue
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th
, 2008
Re: DT
Reply #2 -
Jul 18
th
, 2011 at 6:12am
Print Post
Any chance you could explain how a silly putty timer works? I don't have enough details to explain correctly.
Tonight, I will vid mine in action.
",,,The road goes on forever, and the party never ends..."
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Zeiss Ikon
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Stick & Tissue
Posts: 35
Location: North Carolina, USA
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rd
, 2011
Re: DT
Reply #1 -
Jul 18
th
, 2011 at 5:00am
Print Post
Yep, it's a commercially made equivalent of a Silly Putty timer.
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