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Old Nov 06, 2012, 02:58 PM
Rocket Programmer
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United States, AZ, Mesa
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Quote:
Originally Posted by richard hanson View Post
The LIFE is actually 6.6 volts -but a reg dropping from 7 volts to 5.5 or 6 is a very lightly loaded reg - I use my ALIGN reg for this -
It is when the BEC try to drop from much higher volts to 6 volts that they can get into possible trouble
This is only true of linear BECs, right? I don't think anyone uses those as a separate unit - you typically find them built in to speed controllers.
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Old Nov 06, 2012, 03:04 PM
AndyKunz's Avatar
Illinois
Joined Sep 2001
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Switchers have input voltage limits too, and they can get hot at both ends of the input range.

Andy
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Old Nov 06, 2012, 04:13 PM
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United States, UT, Salt Lake City
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Quote:
Originally Posted by jasmine2501 View Post
This is only true of linear BECs, right? I don't think anyone uses those as a separate unit - you typically find them built in to speed controllers.
Some heli gyro setups like linear - cleaner -
They also were sold for years with the LiIon setups -
I never would use em -
just call me a chicken---
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Old Nov 06, 2012, 04:34 PM
Pompano Hill Flyers
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Miami Lakes, Florida, USA
Joined Mar 2003
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Quote:
Originally Posted by C₄H₁₀ View Post
Switch to mind control. You'll have no more issues unless someone tampers with your morning coffee.
There's a plane hanging in the AMA museum that's said to be sound-controlled.
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Old Nov 06, 2012, 06:36 PM
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United Kingdom, Oxford
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Hummm sorry to burst your bubble but I saw that actual model when it was in the AMA HQ in Reston, I'm sure those are speakers (one each side) to make an aerial loud-hailer via radio mic.

A.
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Old Nov 06, 2012, 07:05 PM
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Quote:
Originally Posted by AndyOne View Post
Hummm sorry to burst your bubble but I saw that actual model when it was in the AMA HQ in Reston, I'm sure those are speakers (one each side) to make an aerial loud-hailer via radio mic.

A.
Probably true but look up reed radios... we used to control planes by sending sound waves over the radio to it.
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Old Nov 06, 2012, 07:15 PM
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Yes I remember reeds, you could actually hear the receiver working.

A.
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Old Nov 06, 2012, 07:17 PM
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Quote:
Originally Posted by jasmine2501 View Post
Probably true but look up reed radios... we used to control planes by sending sound waves over the radio to it.
still do really plug a head set in the trainer jack of any JR/Spekturm radio
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Old Nov 06, 2012, 07:39 PM
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All RC planes are sound-controlled- call over your shoulder "Hey y'all watch this!" and watch it make a nice crater...
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Old Nov 06, 2012, 09:07 PM
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Canada, QC, Quebec City
Joined Sep 2006
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Sonic Glider

This glider was actually one of Jim Walker creation in 1944:
http://www.americanjuniorclassics.co...onicglider.htm
And it was controlled by sound, Jim Walker was very inventive and had a major part in the development of c/l flying at the time. That's why it is at the AMA museum.
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Old Nov 06, 2012, 11:56 PM
Pompano Hill Flyers
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Miami Lakes, Florida, USA
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Quote:
Originally Posted by AndyOne View Post
Hummm sorry to burst your bubble...
Apparently my bubble is intact.

Edit: Thanks to coriolan for the link. Ever since I took that picture while I was at the World Soaring Masters I've been wondering how that thing worked.
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Old Nov 07, 2012, 06:54 AM
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United Kingdom, England, Hitchin
Joined Jan 2004
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Quote:
Originally Posted by richard hanson View Post
The LIFE is actually 6.6 volts -but a reg dropping from 7 volts to 5.5 or 6 is a very lightly loaded reg - I use my ALIGN reg for this -
It is when the BEC try to drop from much higher volts to 6 volts that they can get into possible trouble
Quote:
Originally Posted by jasmine2501 View Post
This is only true of linear BECs, right? I don't think anyone uses those as a separate unit - you typically find them built in to speed controllers.
Yes and no. Switching regulators still have to drop some power as heat, but because of the way they work it's a lot less (15% vs up to 50%+ with a linear). As a result increasing the input voltage still increases the amount of heat to be dissipated, but by a lesser amount. If you want more info this page explains it comprehensively...
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Old Nov 07, 2012, 07:29 AM
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United Kingdom, Oxford
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You learn something everyday. There was no explanation when the glider was on display at Reston and the "diaphragms" looked just like loudspeakers not microphones, it seemed like the obvious assumption they were for making sound nor receiving it.

A.
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Old Nov 07, 2012, 11:00 AM
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Quote:
Originally Posted by AndyOne View Post
You learn something everyday. There was no explanation when the glider was on display at Reston and the "diaphragms" looked just like loudspeakers not microphones, it seemed like the obvious assumption they were for making sound nor receiving it.

A.
There isn't much of an explanation at the AMA museum either. All I saw was a little tag that said it was controlled by sound. You're right that the diaphragms look like speakers, and in fact they are speakers, but speakers can function as microphones. Instead of an electrical current moving the cone, the moving cone induces an electrical current.

By the way, your idea of installing a speaker in a model so that you can broadcast sound through it is interesting. I'll bet you could cause a lot of trouble with something like that.
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Old Nov 07, 2012, 02:41 PM
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I have in fact used a speaker as a microphone but they are very inefficient in that mode.

A.
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