[NSRCA-discussion] E-Safety idea (was: Re: Noxville Contest??)
Jay Marshall
lightfoot at sc.rr.com
Tue Aug 8 12:44:55 AKDT 2006
I would suggest checking Allied Electronics for fuses & holders of various
types. Also remember, there are FastBlow and SlowBlow fuses. Since we are
using them primarily as a switch, I would go with the SlowBlow.
-----Original Message-----
From: nsrca-discussion-bounces at lists.nsrca.org
[mailto:nsrca-discussion-bounces at lists.nsrca.org] On Behalf Of Fred Huber
Sent: Tuesday, August 08, 2006 3:05 PM
To: nsrca-discussion at lists.nsrca.org
Subject: Re: [NSRCA-discussion] E-Safety idea (was: Re: Noxville Contest??)
(note the bad e-maill addy I used below was the "Reply" button... I'm having
to copy-paste the addy in from one specific e-mail to get my replies to go
through correctly)
An in-line fuse and holder would have negligible resistance. It is true
that each connection... each switch, every milimeter of wire adds some
resistance and thus "robs" power from the propeller... but the amount lost
is so tiny as to have negligible effect. (less loss over a whole flight than
the power used in 1/10 sec of slowly turning the prop for example)
A properly rated fuse holder, would be of inconsequential resistance. The
under-rated ones I am finding would have potentially significant resistance
for the application.
A properly rated switch again would have inconsequential resistance.
The ratings of electrical switches and fuses are based on them having little
to no effect on the circuit when they are installed. (if you use the correct
components)
And... more resistance means LESS current CAN flow. Not higher current
draw... less useable power output.
E=IR Add reesistance.. Voltage is constant.. curent MUST be less. But an
electric motor is a variable resistance load...
----- Original Message -----
From: Doug Cronkhite <mailto:seefo at san.rr.com>
To: 'NSRCA Mailing List' <mailto:nsrca-discussion at lists.nsrca.org>
Sent: Tuesday, August 08, 2006 1:46 PM
Subject: Re: [NSRCA-discussion] E-Safety idea (was: Re: Noxville Contest??)
Biggest issue there is anything inline in the circuit means more resistance
and therefore higher current draw.
-Doug
_____
From: nsrca-discussion-bounces at lists.nsrca.org
[mailto:nsrca-discussion-bounces at lists.nsrca.org] On Behalf Of Fred Huber
Sent: Tuesday, August 08, 2006 11:35 AM
To: NSRCA Mailing List
Subject: [NSRCA-discussion] E-Safety idea (was: Re: Noxville Contest??)
What I would like to find is a fuse holder with an easy to insert/remove
fuse (automotive blade type for example) of appropriate amp rating. I can
find 40 amp automotive fuses. Highest rating fuse holder I have found is 20
amp. My system pulls 25 amp continuous max throttle static, so the
appropriate fuse is available... but not the holder.
Pull the fuse... the motor's guaranteed dead. and if somethig does happen
where the prop is chewing an arm or foot, the current should blow the fuse
(if its sized correctly) at least reducing the damage done. A fuse would
also potentially protect the power system (those expensive lipos
especially) in some crashes.
I like the idea of an arming switch... but a fuse could do the same job and
more.
***********
Note... my understanding of a "deadman switch" is from how its explained for
a modern desil locomotive... if the operator dies, he can't keep holding the
switch and the locomotive is supposed to stop. (supposed to...) Thus a
deadman switch on a model would... stop the motor as soon as you let go.
Maybe a misnomer is involved somewhere?
----- Original Message -----
From: Dean Pappas <mailto:d.pappas at kodeos.com>
To: NSRCA Mailing List <mailto:nsrca-discussion at lists.nsrca.org>
Sent: Tuesday, August 08, 2006 1:16 PM
Subject: Re: [NSRCA-discussion] Noxville Contest??
I just received a first production item of a simple safety item called the
JoneSwitch. It is a convenient deadman switch that screws into the side of
your electric plane.
Look to see releases in at least several magazines. Now you can walk out to
the runway before arming your electric system.
all the best,
Dean
Dean Pappas
Sr. Design Engineer
Kodeos Communications
111 Corporate Blvd.
South Plainfield, N.J. 07080
(908) 222-7817 phone
(908) 222-2392 fax
d.pappas at kodeos.com
-----Original Message-----
From: nsrca-discussion-bounces at lists.nsrca.org
[mailto:nsrca-discussion-bounces at lists.nsrca.org]On Behalf Of Jim Stovall
Sent: Tuesday, August 08, 2006 2:08 PM
To: NSRCA Mailing List
Subject: Re: [NSRCA-discussion] Noxville Contest??
Electrics IMHO are way more dangerous than IC engines. I have a $35,000
right arm to prove it. Had one spontaneously start on me at the field while
my forearm was in the way. Chewed through my forearm clear to the bone,
severing my artery, muscle, and ulnar nerve. Very messy. Took 2 years of
surgury and therapy before I could fly again. Electric motors are more
serious in that they draw more amps if they are impeded, in effect they try
"harder" to overcome the force opposing it, like thumbs, fingers, and arms.
Still fly electrics, but treat them very differently now......
wgalligan <wgalligan at goodsonacura.com> wrote:
At least my OS wont spontaneously startup on its own.
I have seen a few electrics majicaly start unattended and thankfully no
fingers or arms were in the way. Both engines and motors are dangerous.
And I do have some smaller electrics.
Wayne
----- Original Message -----
From: J.Oddino <mailto:joddino at socal.rr.com>
To: NSRCA Mailing List <mailto:nsrca-discussion at lists.nsrca.org>
Sent: Tuesday, August 08, 2006 11:53 AM
Subject: Re: [NSRCA-discussion] Noxville Contest??
Another reason to go electric.
Jim O
----- Original Message -----
From: John <mailto:johnferrell at earthlink.net> Ferrell
To: NSRCA Mailing List <mailto:nsrca-discussion at lists.nsrca.org>
Sent: Sunday, August 06, 2006 9:38 AM
Subject: Re: [NSRCA-discussion] Noxville Contest??
I have an $8000 left thumb. They installed a couple of options while they
were rebuilding. It warns of weather changes and also serves as an alarm
clock (sometimes).
I recommended that a student headed for a pro basket ball career give up RC
until the career was behind him.
John Ferrell W8CCW
"My Competition is not my enemy"
http://DixieNC.US <http://dixienc.us/>
----- Original Message -----
From: BUDDYonRC at aol.com
To: nsrca-discussion at lists.nsrca.org
Sent: Sunday, August 06, 2006 11:10 AM
Subject: Re: [NSRCA-discussion] Noxville Contest??
About two years ago I got my finger in one It cut the right index finger off
at the first joint. Wrapped the finger in a towel went to the hospital with
the severed finger, three month's and $6000.00 later it was almost as good
as new except it is still numb on the end. APC's show no mercy.
Buddy
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