MythBusters
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Junior Member
Registered: 08-30-07
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I tow cars and trucks and the cable they used broke, and there are tow straps that cak take the force of the car moving 30-49 MPH. I don't think they need to look some more...
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Senior Member
Registered: 11-16-05
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quote: Second, and in my opinion the major reason for the rope/cable break, is that the calculations were assuming a turn that began when the mass had drawn even with the tie point for the grapple and with a cable/rope that was perfectly taught at that point (i.e. that at the moment the car begins the turn the car is still traveling parallel to its original path, the cable running from the solid object to the car tie point is perpendicular to the car's original path, and all slack has been taken out of the cable). Instead, since they were dealing with a fired cable with the slack taken up by the car's foward motion is that the angle between the taught cable and the car's direction of motion was much less than the optimal 90 degrees
Grant was obviously correct in his calculation for a taught rope, the tension is just given by mv^2/r. For a completely slack rope and an angle of 0 degrees, the tension is obviously infinite to first order (ignoring the stretch of the rope). Can any of you math wizzes come up with an expression for the tension with an angle somewhere between 0 and 90 degrees? |
Junior Member
Registered: 08-30-07
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for the car 90 degree turn they should have used two of the first cord.
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Junior Member
Registered: 08-30-07
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Several people have hit on the facts and it is simple as the rope and cable were simply under rated for the force applied. There is a rope available which will do the job and be able to be shot out with the hook. The material is made by Samson rope and the material is called AMSTEEL-BLUE. 1/2" will hold 34,000LBs and maybe would work but I would choose the 5/8" which holds 52,800LBs. The rope is light weight even floats.
Rember Wayne Industries often had its best products rejected by the military. PS I would use at least 4 cable clips.
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Junior Member
Registered: 08-30-07
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They never tried drifting into the turn. If they tried drifting they could definately make the turn.
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Senior Member
Registered: 03-10-07
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quote: for the car 90 degree turn they should have used two of the first cord.
Did they use two lines in the comics? Even if they did test it with two it would not have mattered. They would not have been able to catch with both lines at the exact same time. quote: They never tried drifting into the turn. If they tried drifting they could definately make the turn.
Did Batman drift in any of the movies, or in the comics? No he did not. |
Junior Member
Registered: 08-30-07
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Well to be totally satisified, I would have them use something called plasama rope its what tug boats use to pull tanker ship around.
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Junior Member
Registered: 08-30-07
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i think they should have used 2 grappling hooks with more than 1 sable attached to them each
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Junior Member
Registered: 08-30-07
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the cable needs to be shot from the front or the car will just crash.  |
Junior Member
Registered: 08-30-07
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They should have placed the cannon as far towards the front of the car as possible, placing it behind the center of the car means more force needed to turn the front of the car, by placing the cannon at the front, the force of the cable is put on the front of the car directly, making it easier to turn the front end of the car. enabling the 90 degree turn.
I just watched this episode and had to put this comment in
picture refference
car-> | \&- <-cables
what they did |- with the cable not at the fron the entire front end is being pulled by the frame of the car, not the cable
what they should do |\ cable at front means less resistance and less force needed.
sry this is kinda long its kinda hard to explain so i tried my best
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Junior Member
Registered: 01-15-04
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Great myth, but it needs a revisit. The cable broke, because there was too much force on it. The acceleration (a) was caused by the mass of the car accelerating to a different velocity vector (F=m*a). a=dv/dt, so if we increase teh time spend for this sudden change in direction, we decrease teh force. How do we do that? Just add some very heavy duty springs on where the cable connects to the car. Maybe put one in the grappling hook, too, if needed.
I think the Jr. Mythbusters need to retry this with teh same setup but with a big spring to soften the acceleration. The experiment setup looked good to me, otherwise.
-Dan
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Junior Member
Registered: 01-15-04
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Spitfire has a great point. The grappling gun should be mounted closer to teh frot, maybe right in front of the front door.
-Dan
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Senior Member
Registered: 01-29-07
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i dont know if its been said yet but they could use a SPIDER SILK ROPE. pound by pound its stronger than steel!!!!
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Junior Member
Registered: 08-28-07
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quote: Hey guys. I was thinking. I know it looks like Batman has a lot of weight on his car but maybe not? Perhaps the car needs to be lighter. Instead of increasing the strength of the cable, change a different factor. The weight.
I was thinking that same thing. Why not use the neon, which is a lot lighter? Yes it's not a sports car and it wont handle like a camaro... But even if they still used the camaro and just lightened it up a bit. I own a neon, and i've taken it around a 90 degree corner at pretty close to 30mph (Closed parking lot, late at night, nobody around...don't worry). My tires slid a little, but if a car is grappled, the tires might not slide. Also, I was bummed they didn't try it on a stationary pole. |
Senior Member
Registered: 01-29-07
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again ill bring this up... the rope broke cuz it was too weak to hold it so they should use SPIDER SILK ROPE!!! inch by inch its stronger than steel (i apologize for the typo before i said pound by pound thats wrong)!!!!!
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Junior Member
Registered: 08-31-07
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I was thinking they should try the new Spectre Line, and a slightly smaller grappling hook.
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Junior Member
Registered: 08-31-07
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The 90 degree turn might have been possible if the cannon was more twords the front of the car. the back dosent make much sense. it would whip the front end in the oposite direction instead of in the front were it would pull it around the corner. also i do agree with the cable might just not be out there that can take that kinda stress and be launchable. but wouldnt hurt to try it again. from the looks of it alot of ppl feel the same way
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Junior Member
Registered: 08-31-07
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I am also thinking that a professional stunt driver could have done a thing or two to help with the driving and turning in this myth.
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Junior Member
Registered: 08-31-07
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The whole 90 degree turn idea was done poorly done from what I saw since the car they were usiing was a RWD camero or firebird type the grappling hook should've been placed near the front of the car. I blieve this would put less stresss on the cable. Since the car already turns in the front I think that should've been factored in. With it being in the center I think too much of the cars weight is placed on the cable to make the turn. Might help to run this again on a smaller scale say using a RC car, but thats just my opinion
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Junior Member
Registered: 05-05-06
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i think they should have doneit with 2 ropes insted of one beacse there would be less pull on each string. then it would be possible.
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