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tonyrenshaw268(at)gmail.c
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 Posted: Fri Jun 18, 2010 2:25 pm Post subject: Rope acting as kill switch. |
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Frans,
I think for all the effort in getting the battery out, it might be better to get yourself out. Why not open the door which will no doubt tear off, and of course wearing a shute, jump clear? Now what we need to discuss is the most appropriate manoeuvre to put the a/c into so that when "we" depart the a/c, we don't hit the tail, or it doesn't hit us. I am suggesting an inverted bunt might be the best, but you need to remember to undo your belt before you do it. So, maybe we connect the rope that was to eject the battery to the door, and to the seat belt restraint? Then, when the door is opened it pulls the rope, which disables the seat belt attach? If the bunt became the manoeuvre of choice, we could harden up the system and make the rope attached to the door, undo the seatbelt restraint and also deploy a drogue chute in anticipation of the bunt manoeuvre? Of course that would only give you a minuscule amount of time in which to roll inverted and bunt, to spit you out before your drogue shute drags you through the aft part of the a/c, but, thats an incentive to get on with it, so no "chickening out". I reckon we can work more on this rope idea, for lots of other functionality. I suggest a rope thread.
Reg
late at night, too much soccer, and beer. I would have been OK had Frans not provoked me. 
On 18/06/2010, at 11:47 PM, Frans Veldman wrote:
| Quote: |
On 06/18/2010 06:30 AM, Tony Renshaw wrote:
> is there another way of achieving this same goal? I suppose in the case of a crash it would mean that you would have voltage still coming forward
Thinking about it, and your electron aversion...
Why not connect the battery via two plugs that can be pulled apart.
Make a hatch below the battery, closed with a safety pin, connected to a
rope leading into the cockpit. No fancy electrons needed.
In an emergency, on final for your crash landing, pull the rope. The
weight of the battery will for sure pull the plugs apart on its way out.
Bye bye battery.
Advantages:
1) No fuses, no switches, no wires, no relays, no mess. No female
electrons to bug you during final on your crash landing. Just a rope and
pin. People have relied on these for ages for various of purposes. Every
mechanic understands how it works.
2) There is nothing to spark left, no relays that can switch on again
due to the forces acting upon them, no battery that might get punctured
by your elevator mass balance arm and emit a shower of sparks as a
result, your knee can't bump into the master switch and power up the
ship again during the most critical stage of the crash, everything with
sparking ability is just simply dumped overboard.
3) The aft-mounted battery won't bump into your head, it is already
gone. One thing less to worry about.
4) The reduce in weight might well be an advantage in getting the
aircraft to a stop. The lighter the aircraft is, the less mass you have
to decellerate.
Just keep it simple.
Of course you have to attach a red "for emergency use only" label to the
rope and brief your passengers not to pull on it while asking "what is
this for" when your are circling his home vilage. If you want to be
fancy you cat attach a small parachute to the battery. This has the
additional advantage that you can test the system overhead your airfield
and it won't cost you a new battery.
Frans
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craigb(at)onthenet.com.au
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| Posted: Fri Jun 18, 2010 3:21 pm Post subject: Rope acting as kill switch. |
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tony I dont know if you have read your off list email, but i sent you
something last night which you migt find helpfull, I will add to it here on
list
how about a couple of 100 amp blade switches, one on the positive, one
negative
with a lock wire on each, and the deadman pull cord to pull the switches in
an emergency.
power consumption is zero, unlike a relay based solution, and is fairly well
foolproof
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gregoryf.flyboy(at)comcas
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| Posted: Fri Jun 18, 2010 10:52 pm Post subject: Rope acting as kill switch. |
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Well thought out Tony. I like the lesson that teaches one to jump quickly,
and without feint of heart.
I hope your beer and soccer mixed ok . I tried to mix running and beer one
time, thinking that the beer would kill the pain of the running, but it only
made it much worse. Oh those College experiments!
This rope thread sure has blossomed. Maybe we can use it to keep from
hanging ourselves yet.
Just one comment with Craig's dead man rope idea. You could cut the weight
in half by using only one blade switch, since two is not necessary. Yes, it
could be foolproof. Proof? I'd say about 200 proof oghter do it (hiccup).
Greg
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