Unphayzed, one question, although you will prevent skidding, if you keep the weight in the back, wont that mean that the initial breaking force/deceleration be less than if you had a fixed weight at the front because when the weight is in the back, the center of gravity is more rear ward, and the force of friction is less at the front where the brakes are. However, if you have the weight in front, although you will have more skidding, intially, the braking will be stronger.
I was thinking about a design similar to this in designing my own vehicle. However, wouldn't you want the weight to sling backwards upon braking to prevent skidding forwards, instead of slinging forwards w/ the vehicle? You could achieve this by attaching a cord to one of the axles.
So the reason that the vehicle would skid after stopping is if the vehicle still had momentum after breaking. The this vehicle design utilizes the remaining momentum into propelling the weight forward. Additionally, by moving the weight forwards, the vehicle's center of gravity is also moved forward, closer to the breaking mechanism and, therefore, making it easier to stop. It's easier to understand if you try it yourself. Try to run your vehicle with the CG in the front of your vehicle and compare it to when the CG is at the back. You will notice that the vehicle will move significantly faster but at the cost of skidding when the GG is at the back. By letting the vehicle start off in the back and smoothly ending up in the front, you achieve the best of both world, moving faster and stoping safely.
Hello, I’ve greatly enjoyed your videos, but I’m rather confused on how to calibrate my brakes. What is the best way to tell how many turns your vehicle will need while taking into consideration loss of kinetic energy through friction. (I’m finding that my vehicle stops a bit too soon) Thanks in advance!
Hi! To determine the amount of wheel rotations for your braking system (assuming that it is a standard wingnut braking system), is to use the following equation: (Target Distance / Brake Wheel Circumference) = Rotations Needed. However, if you are using a spring then you might need to use some trial and error. Are you perhaps using the Expert GV kit or your own design? I may be able to help you better if I have some more specifications of your vehicle.
Yes, this is permitted by the rules. All kits are shipped with 2-3 day USPS priority mail. However there may be some delays in USPS shipping services due to COVID-19
I got them from Amazon. They were about 1” in length, but you would want to optimize the diameter of the spring for your specific car if you are building from scratch.
@@UnphayzedScioly Could you send a link or tell me the max load lbs because I don't want to get a spring that won't compress all the way every run and cause varying results. Thanks.
The exact spring in the video is a 3/8 x 3/4 spring, however this is specific to the weight I have moving. If you want to determine the exact strength within a spring you would need to use hooke’s law and find a spring with a k value and length that is able to withstand the force applied by the moving weight. Because you have a lot of weight to work with, you could always invest in significantly larger diameter and length springs instead of going through calculations. If you are having trouble with finding a starting point for your spring, I recommend a 23/64 x 1-3/8 spring as it should be sufficient for about 1-1.5 kg.
You could build this kit in about an hour, but you would ideally want to spend a considerable amount of time testing for the best results. Spending time testing and practicing is important for any gravity vehicle to be consistent.
Unphayzed, one question, although you will prevent skidding, if you keep the weight in the back, wont that mean that the initial breaking force/deceleration be less than if you had a fixed weight at the front because when the weight is in the back, the center of gravity is more rear ward, and the force of friction is less at the front where the brakes are. However, if you have the weight in front, although you will have more skidding, intially, the braking will be stronger.
Hi, can you please tell me what wheels you guys were using for the vehicle?
Not a single demo episode in 8 minutes?
I was thinking about a design similar to this in designing my own vehicle. However, wouldn't you want the weight to sling backwards upon braking to prevent skidding forwards, instead of slinging forwards w/ the vehicle? You could achieve this by attaching a cord to one of the axles.
So the reason that the vehicle would skid after stopping is if the vehicle still had momentum after breaking. The this vehicle design utilizes the remaining momentum into propelling the weight forward. Additionally, by moving the weight forwards, the vehicle's center of gravity is also moved forward, closer to the breaking mechanism and, therefore, making it easier to stop. It's easier to understand if you try it yourself. Try to run your vehicle with the CG in the front of your vehicle and compare it to when the CG is at the back. You will notice that the vehicle will move significantly faster but at the cost of skidding when the GG is at the back. By letting the vehicle start off in the back and smoothly ending up in the front, you achieve the best of both world, moving faster and stoping safely.
@@UnphayzedScioly Huh, interesting. I was thinking of a rear braking mechanism.
Hello unphayzed, what wheels are you using and do you know where to buy them from.
Banebots 2 3/8”
@@UnphayzedScioly Thanks!
Weight?
Hello, I’ve greatly enjoyed your videos, but I’m rather confused on how to calibrate my brakes. What is the best way to tell how many turns your vehicle will need while taking into consideration loss of kinetic energy through friction. (I’m finding that my vehicle stops a bit too soon) Thanks in advance!
Hi! To determine the amount of wheel rotations for your braking system (assuming that it is a standard wingnut braking system), is to use the following equation: (Target Distance / Brake Wheel Circumference) = Rotations Needed. However, if you are using a spring then you might need to use some trial and error. Are you perhaps using the Expert GV kit or your own design? I may be able to help you better if I have some more specifications of your vehicle.
@@UnphayzedScioly thanks for the reply! I will definitely have to try this out. I made my own vehicle that has a wingnut breaking system (no spring).
I am interested in buying this kit. Is this allowed and how long would shipping take?
Yes, this is permitted by the rules. All kits are shipped with 2-3 day USPS priority mail. However there may be some delays in USPS shipping services due to COVID-19
Just ordered the kit! Hopefully I get it before Friday!
Where did you get your spring for the braking system from?
I got them from Amazon. They were about 1” in length, but you would want to optimize the diameter of the spring for your specific car if you are building from scratch.
@@UnphayzedScioly Could you send a link or tell me the max load lbs because I don't want to get a spring that won't compress all the way every run and cause varying results. Thanks.
The exact spring in the video is a 3/8 x 3/4 spring, however this is specific to the weight I have moving. If you want to determine the exact strength within a spring you would need to use hooke’s law and find a spring with a k value and length that is able to withstand the force applied by the moving weight. Because you have a lot of weight to work with, you could always invest in significantly larger diameter and length springs instead of going through calculations. If you are having trouble with finding a starting point for your spring, I recommend a 23/64 x 1-3/8 spring as it should be sufficient for about 1-1.5 kg.
How long does it take to build a gravity vehicle?
You could build this kit in about an hour, but you would ideally want to spend a considerable amount of time testing for the best results. Spending time testing and practicing is important for any gravity vehicle to be consistent.