# Secret Spy Shoe

4 Steps
Secret Boot Heel Grappling Hook

Supplies
1.  8" of 1/8" steel tubing
2.  10' of 1/16m or 3/32 steel cable
3.  1/16 or 3/32 wire clamps
4.  Old pair of shoes

Tools
1.  Drill
2.  Dremmel
3.  Welder (MIG, ARC, TIG)
4.  Wire cutters

1.  Torch
2.  Vise

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## Step 1: Cutting

Mark and cut the 1/8" steel tubing into two four-inch pieces.
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santa1010 says: Oct 28, 2012. 2:22 PM
florman, you're probably safe, but please keep the following in mind:

If a cable breaks at 120 lbf (pound-force), a 95-lbf person jerking the cable at a rate of 40 ft/sec^2 would break the cable. [Calculation: 120 lbf * 32 ft/sec^2 / 95 lbf = 40 ft/sec^2]

If a 95-lbf person were to swing on a 5-ft cable that breaks at 120 lbf, he would only have to swing 3 miles/hour (about walking speed) to break it. [Calculation: sqrt((120 lbf * 5 ft) / 32 ft/sec^2) ~ 4 ft/sec ~ 3 miles/hour]

(2) Lucky for you, working loads are usually given a safety factor of 5, meaning that your cable shouldn't break until you give it a 600-lbf load. This means you (being 95 lbf) would have to jerk the cable at a rate of 202 ft/sec^2 to break it. You would also break it if you were to swing at about 6 miles/hour with 5 ft of cable.

(3) Unfortunately for frisbeechampe1983's acquiantance, the combination of swinging and abrupt stopping when he hit the wall made a large enough acceleration for the load to exceed the cable's limit.

(4) Additional notes: (a) Make sure you know the difference between mass and weight. (b) The working load limit is determined by a load being uniformly applied in a straight line pull. You are not only changing the load by moving along the cable, but any additional movement on your part makes it risky. (c) The tensile properties of the cable are changed every time you go on and off just because the loads are changing.
florman (author) in reply to santa1010Feb 15, 2013. 11:05 AM
Thanks I'l keep that in mind
johnlaw45 says: Oct 28, 2012. 9:52 PM
Where are you hiding the pillow you need to sit on after your mom caught you rapelling in your Sunday clothes?
stephenham5511 says: Oct 28, 2012. 3:22 PM
saweeeet!!
J-Five says: Oct 28, 2012. 8:19 AM
You could put a phone in your other shoe!

Wait, I shouldn't give you any ideas.
g3lrod in reply to J-FiveOct 28, 2012. 12:05 PM
"This is Maxwell Smart, secret agent 86, calling for Control! Come in, Control!"
D0itYourself says: Oct 28, 2012. 2:55 AM
Hey mate, nice instructable, but I wouldn't recommend it on the way you use it...
The cable is very thin and you cannot hold it very well for a slow rappel... Probably another use. But GREAT idea
florman (author) in reply to D0itYourselfOct 28, 2012. 8:11 AM
your right about the holding on part of it but the cable is rated at 120 and i'm 95.
frisbeechamp1983 in reply to flormanOct 28, 2012. 9:56 AM
Just remember, that 120 is also in force. I knew a kid who tried to rappel a five story gym (our high school gym had roof access.) and he thought 550 would certainly hold him. it did for the first five feet, then he tried to do a jump, when he hit the wall, the 550 snapped. luckily there was grass below him, but he broke his neck. Just remember climbing rope is safely rated at 2200 pounds of force. (22kn)
D0itYourself in reply to flormanOct 28, 2012. 9:12 AM
I don't mean that it gonna brake or something similar, the nature of that cable is not for rappelling
LostRite says: Oct 28, 2012. 1:16 AM
Very nice. Can the hook hold all your weight for a ascent or rappel? I made a concealed grappling hook a long while ago. It was a belt. the clasp was a tri-fold and assembled quickly and locked into place. The rope was already tied and acted as a belt. It worked well but was a bit tedious to unwind and rewind around the waist. I like your velcro idea a lot :)
florman (author) in reply to LostRiteOct 28, 2012. 8:08 AM
thanks and the cable is rated to 120 so i figured since i'm only 95 i'd be okay
Machine says: Aug 11, 2012. 6:39 AM
Lads, that's a nice grappling hook with cable you've produced, but, it does occur to me that you have greater skills in producing interesting vids to demonstrate your new instructable. Whoever did the editing did a great job and the videoing was done well too.

Here's my suggestion;

Produce a pile more equipment accessories that are wearable and usable in emergencies and get yourselves a brand name too for those devices and vids.

You've got talent, exploit it.

Robert.
florman (author) in reply to MachineOct 28, 2012. 8:05 AM
thanks
Thundermoon99 says: Aug 11, 2012. 1:22 PM
That's legit :)
mrmerino in reply to Thundermoon99Sep 13, 2012. 2:12 PM
Correct, this is most definitely an Instructable on how to construct a grappling hook show.
gunshow says: Aug 1, 2012. 7:24 PM
awsome place to live
florman (author) in reply to gunshowAug 6, 2012. 8:27 AM
thanks
drdan152 says: Jul 3, 2012. 5:50 PM
Did you get your prize in the mail yet?!!
florman (author) in reply to drdan152Jul 9, 2012. 7:19 AM
No not yet
drdan152 in reply to flormanJul 11, 2012. 1:08 PM
They just mailed mine a few days ago ..... Hope I get it this week :-)
metroman58 says: Jul 10, 2012. 2:37 PM
when it came to the cable storage i think it might work just as well if you laced the shoes with the meatel wireing instead of to ur sock
florman (author) in reply to metroman58Jul 10, 2012. 3:10 PM
I tried that but I couldn't fit it all there.
KneXtreme says: Jun 26, 2012. 5:08 AM
Yay you won first prize! congrats! Yours was my favorite.
florman (author) in reply to KneXtremeJun 26, 2012. 7:10 AM
Great to hear thanks
Xillra says: Jun 22, 2012. 10:18 PM
I'm guessing paracord (I HAVE SO MUCH OF IT) will work? The only issue would be thickness, but would give more friction for holding on...?
Any thoughts?
florman (author) in reply to XillraJun 23, 2012. 4:02 AM
Paracord would probably work fine but you might want to check the working load on it.
suayres says: Jun 18, 2012. 3:04 PM
Also, don't cross your leg and rest that foot on your thigh (as so many guys do).
florman (author) in reply to suayresJun 19, 2012. 1:32 PM
lol
DavidM45 says: Jun 19, 2012. 11:10 AM
Nice going kid gotta love it. FYI 1/16" Vectran rope is 800# tensile strength, coils much smaller (as in could store with hook) and 20' weighs less than an oz! The stuff is NOT available at the hardware store (www.APSltd.com) for the serious spy at \$6. BTW: 1/16" 7 strand steel is 500# braking strength I don't know safe working load. Wear heavy gloves for sure!
florman (author) in reply to DavidM45Jun 19, 2012. 1:31 PM
Cool I'll add that to my instructable soon
Shadow Ranger says: Jun 19, 2012. 10:36 AM
Hate to mention it but now that you have that on instructables every kid and adult will be looking at the heels of everyones' shoes to see if they have one of those...not so secret anymore, huh? :P
olliew72 says: Jun 14, 2012. 10:20 AM
This looks like the perfect way to get tackled by a TSA official at the airport! Thanks.
florman (author) in reply to olliew72Jun 18, 2012. 3:57 PM
lol
chenghwan says: Jun 17, 2012. 8:25 PM
But then, it is just a hook, the TSA officer wouldn't mind would they?
espdp2 in reply to chenghwanJun 18, 2012. 3:39 PM
Not for genuine spies! ;-)
espdp2 says: Jun 18, 2012. 3:38 PM
Sweet idea! I LOVED the video too. Looks like it was really burning your hand by the time you reached ground? :-)
suayres says: Jun 18, 2012. 3:08 PM
But (sorry, it has to be said), very SMART!
HEY YOU says: Jun 18, 2012. 3:17 AM
Great Video!!
If you are not concerned with retrieving your hook (Q-branch would give you another in any case), you could use a carabinder on your house keys and webbing (as noted above) for a belt that would likely pass casual inspection.
Well done instructable and great acting.
Cheers
ollie owl says: Jun 17, 2012. 8:24 PM
what happen's when walk across and leave foot print not so Secret it tell every one something is the under shoe
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