whats the best motor to power a grappling hook similar to the one in the video whats the best way to power said motor how much could motor lift. idealy while still being small enough to fit on an arm mount.https://www.google.com/url?sa=t&rct=j&q=&esrc=s&source=web&cd=2&sqi=2&ved=0ahUKEwikgNv30vTMAhVHXD4KHXjDAV4QtwIIJDAB&url=https%3A%2F%2Fwww.youtube.com%2Fwatch%3Fv%3D4OyoWAZEcIE&usg=AFQjCNGefNTCv9YsYex5HxXckVDW2Rz60A&sig2=14cvl_PFmO8JNv0KznpmwA&bvm=bv.122852650,d.cWwhttps://www.google.com/url?sa=t&rct=j&q=&esrc=s&source=web&cd=3&sqi=2&ved=0ahUKEwikgNv30vTMAhVHXD4KHXjDAV4QtwIIKjAC&url=https%3A%2F%2Fwww.youtube.com%2Fwatch%3Fv%3DarbNxONg88c&usg=AFQjCNG5V58I88nKozxV7gHJHIAFmbQkfA&sig2=aDoSSZWY0LtcttzFVG4rdg&bvm=bv.122852650,d.cWw
https://www.youtube.com/watch?v=4OyoWAZEcIE
https://www.youtube.com/watch?v=arbNxONg88c
>>998426
Watch the Vids, see that he uses a hacked cordless drill, get a cordless drill, take it apart, mount it on your thingi, Done.
>>998447
not a cheap drill either. has to be a decent quality one or it will break very quickly
>>998426
>>998428
>>998430
>>998431
>>998672
Don't use a hacked drill. I mean - use one if you reelly want to, but don't expect it to last long or lift you quickly.
I'm working on a custom electric motor for this very application. Stay tuned, I should be posting back here by Christmas with a working prototype
>>999104
awesome in the meantime can you think about any motor on the market that would serve the purpose. and work reliably and quickly
>>999188
A compact winch from Harbor Freight with a made-to-order battery pack from China (re: $$ cost) would pull you up reliably but not quickly for under a thousand dollars - $1000USD.
I tossed around the idea of using a car starter, but that wouldn't have the torque necessary to pull you up reliably. You need a brushless DC motor with a flywheel for torque - that's where I'm at.
Alternatively, you could just get really good at climbing rope.
>>998426
"objectively best" motor is something like a winch motor.
"practically best" motor is like in the vid you embedded. Why not just copy his design? You want high torque, and real life isnt like games, so you cant pull yourself 10m in 1s with something handheld without exploding your arm.
>>999239
ok thanks for the advice
>>999239
also would a kevlar based rope be the best rope to use or would you need something with more give
>>998426
Power = force * speed.
E.g. if you want to pull a mass of 75kg at 1 m/s then force = 75kg * 9.81m/s^2 = 735.75N and thus power = 735.75W (= 0.986 HP).
Once you've found a suitable motor, you need to determine the gear ratio to get the right balance between torque and speed (a bare motor will probably have too much speed and not enough torque, so the gear ratio will be step-down).
Force = torque / pulley radius.
Speed = (RPM / 9.55) * pulley radius (the 9.55 is 60/(2*pi), converting RPM to radians/sec).
>>999365
The main problem with kevlar is that it's not very durable.
>>999396
so then what would be the best rope to use
>>999365
>>999406
Your rope should have the following features:
>At least 5mm thick (so you can grasp it in case of emergency)
>Heat and abrasion-resistant
>Maximum tensile strength equal to 15 times your bodyweight (OSHA standards for safe workloads)
I will be using 7.5mm Personal Escape Rope - nylon core, technora sheath.
http://www.rocknrescue.com/acatalog/Sterling-7.5-mm-Escape-Tech.html
>>998426
So, OP - I answered some of your questions, now I have one for you.
Why are you trying to build a self-retracting grappling hook? Obviously it's cool as hell, but for what do you intend to use it?
>>999638
I have this project in mind. Mostly just to prove it can be done. But essentially a real life hero type thing. Ive been going to the gym learning parkour and building difrent device such as grappling guns, pneumatic boots. Esentialy making a full suit.
>>998426
this is as close as your gonna get, realistically
https://www.youtube.com/watch?v=4tWCJDEqOAU
http://www.npr.org/templates/story/story.php?storyId=7813024
>>999744
You've got your work cut out for you, that's for sure - pic related. I've been working on this same project for the past few years now.
If you want to share notes send me an e-mail sometime. I think I may be able to fill in some blanks for you.
[email protected]
>>999757
IT'S HAPPENING
>>999757
what area are you in
>>999774
that it is
https://www.youtube.com/watch?v=Z3OiBNgJDKk
potential project
>>999104
interesting, I'm curious to see what it is as I'm trying to invent a unique method of propelling the hook/rope forward. How big do you intend the final motor to be?
>>999882
what do you mean unique method of propolsion.
what do you have in mind?
>>999874
East coast USA, Northeast corridor.
>>999882
The motor design i'm using has a power:weight ratio of 1HP:5lbs. My motor will be 1.5HP so it will weight about 8lbs. Thay's the motor only - there's still the matter of the launching mechanism, electronic controls, the battery pack, and the spool of rope. Still, my prototype should weigh in at under 50 pounds and even less once I refine the design after prototyping.
