[NSRCA-discussion] Arming device

[Keith Hoard]

I think the YS guys should have their caller remove the fuel tank and glow plug before picking up the plane and exiting the runway  . . .

 

From: NSRCA-discussion [mailto:nsrca-discussion-bounces at lists.nsrca.org] On Behalf Of precisionaero via NSRCA-discussion
Sent: Saturday, May 16, 2015 8:38 AM
To: General pattern discussion
Subject: Re: [NSRCA-discussion] Arming device

 

I think we should reconfigure a YS engine to drive a generator to supply electricity to the electric motor.

 

 

Sent via the Samsung Galaxy S™ III, an AT&T 4G LTE smartphone

 

-------- Original message --------

From: Peter Vogel via NSRCA-discussion 

Date:05/16/2015 09:31 (GMT-05:00) 

To: General pattern discussion , ronlock at comcast.net <mailto:ronlock at comcast.net> , David 

Subject: Re: [NSRCA-discussion] Arming device 

 

I think we're all in agreement, which is why the rules proposal we put forth requires a *physical* break in the circuit!

Sent from Outlook <http://taps.io/outlookmobile> 

 





On Sat, May 16, 2015 at 6:16 AM -0700, "ronlock--- via NSRCA-discussion" <nsrca-discussion at lists.nsrca.org <mailto:nsrca-discussion at lists.nsrca.org> > wrote:

I'm in agreement.

Ron Lockhart

 


  _____  


From: "David via NSRCA-discussion" <nsrca-discussion at lists.nsrca.org <mailto:nsrca-discussion at lists.nsrca.org> >
To: nsrca-discussion at lists.nsrca.org <mailto:nsrca-discussion at lists.nsrca.org> 
Sent: Saturday, May 16, 2015 1:14:21 AM
Subject: [NSRCA-discussion] Arming device

 

I'm not trying to bring up a sore subject but this has been bugging me since it was up a while back. I am the senior electronics technician in the plasma physics department at the University of Wisconsin. About a third of what I do is make interlock circuits for the Madison Symmetric Torus. I know that the best way of keeping things safe is to remove the potential energy from a circuit to keep bad things from happening. The problem with depending on a circuit such as the emcotec type of disconnect or to just relying solely on the radio and ESC to keep things safe is failure modes. You can plan for all different failure types but to make it a circuit that isn't a lead brick being added to the plane there are compromises that have to be made. This leads to designing systems that may deal with only the most common types of failures. For example most common diodes and tantalum capacitors usually fail in a shorted mode, but not always. Many carbon resistors will decrease in résistance just prior to opening up. You get the idea, there are just so many possibilities and combinations that in my opinion the only real way to safe a power system is to disconnect the energy source. Ok, now I feel better that I said something. 

 

David

 


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