I talked about weight distribution. How, if you’re getting into it – and you want to save some money – and you already have shorty packs – you can get a shorty pack and then use the space to distribute some weight so that you can make the weight requirement for usgt. Well, now, we’re going to be talking about mass distribution or center of mass, how to find an approximate location, how to know approximately where your mass is centered and for this you really just need three axes. Think about it as a coordinate, plane, right x, y z, uh, and you have to find just a little area if you’re within. If you can find just a two centimeter box or a two centimeter cube, your center is going to be somewhere in there. Now two centimeters is quite a bit, but for rc’s it’s it’s good enough close enough uh. So first thing you need to do is uh i’m gon na ignore the body so i’m, not gon na use the body for now, but you do want to plug everything in so you plug everything in just so the wires aren’t dangling, because now you have uh Free mass and this i’m going to say is negligible because they don’t even weigh a gram, so i’m gon na ignore ignore that weight. So keep that in mind. The next thing that you want is just grab one of your batteries so i’m using my shorty.
I could have used my other lung battery but i’m going to use the shorty for this and to make sure you have a flat surface. You can just use your alcohol level and just make sure this level is flat and the only thing that you’re going to do is you’re going to look for a box, so you’re going to take this battery and this edge here. You want this to run alongside an axis of your car and then you’re just going to move your car. So just to give you an idea, let’s say this is the battery. This is the table, so pretend it’s a transparent table, you’re just going to move your car until it starts to tip over once it tips you would just mark or make a note of that area. Then you move it to the other side once it tips. You mark that area and then you’re going to have a space in between maybe maybe you’ll hit the same exact line every time. I doubt it. This method is an approximation it’s, not that perfect uh. But then your center mass would be between those two lines and then you would find your left and right. Your relative center or an approximate center left and right then you’re going to do the same thing. But you’re going to go front to back so you’re, going to slide your vehicle until it tips mark it slide your vehicle until it tips mark it and between those two lines is going to be that center.
So then imagine you have a a line going. This way and then a line going this way right where they intersect. That would be your approximate center mass when it comes to left and right so i’m going to place my battery here notice, the car falls. So that means that i’ve i have to move it forward there it’s staying still, so let me just try to move it until it starts to tip over all right, so it starts to tip over when the battery is right about there. So i would just make a line right here now: i’m going to try to see when it tips over the other way. So the line just for reference it’s about halfway, where the fan is now i’m, going to move it the other way and see where it starts tipping forward and actually it’s about half of the fan again uh actually it’s before the fan. No there we go just before the fan all right. Just before the fan oops, i moved it so, the first time it tipped back. It was about halfway into the fan forward. It was just in front of the fan, so my center mass is right about here. Right about there this is my center as far as front and weight bias so i’m right about here, which is actually pretty good, it’s it’s, somewhat centered between front and back, and if i measure yes, i’m using a ruler instead of tape, uh it’s, actually pretty good.
So i’m, looking at about 13 13.5 uh from here to here, so i have a little more weight toward the back on the front of the car, which is one of the reasons why i added these weights to the front. Now keep in mind that once you fit the body i’m doing this without the body, so you can see when you fit the body. The body is actually going to change it as well. So the body does make a difference, so you will notice a slight difference when you run your usgt body versus your vta body, assuming you’re using the vehicle for both things that’s, why? You will notice that on my vta when i place the weights, i actually placed them more toward the front of the body uh. That was the reason why so i could get a little more weight in the front, but anyway uh. That being said so now, you’re gon na do the same thing, but now you’re gon na go left and right to try to find it so you’re, just gon na move the vehicle again until it starts tipping over and then you can use a little piece of Masking tape, for example, you could put it on the chassis just to make a note and then remove it and then go to the other way, just as a reference point, but right now, i’m, just moving to the right and i’m moving it until the vehicle wants To just tip over all right, so it will be right about here, that’s, where it wants to tip over, which is right at this gap.
I can actually feel it so it’s tipping over right here right, where this opening begins now i’m going to do it again but i’m going to do it to the left so i’m going to go left now and i keep moving the car until it starts to Tip over all right, there we go and i remove the battery there. We go i’ll put my nail there and it’s right about here this other gap. So then, my strip would actually be right where these screws are so it’s, pretty centered, left and right with this setup. So if you haven’t watched uh how i distributed my weights in previous videos, i have four here on the front and then i have nine here below the receiver box, but between the electronics and the battery it’s, pretty balanced, left and right, but that’s. What you need to do just use your battery go to one edge, see where it starts tipping, make a note, go to the other, see where it starts tipping, and then you know so. For example, let’s say: if you place the battery here and it started tipping right there and then it started tipping right here. You know your weight bias is on this side, so you’re going to want to add weight to the opposite or remove weight from that side. Just to shift your mass your center mass over now i’m really happy with the uh mass distribution left right and i actually like the front back.
It works for me, uh front uh left right. You want something to be centered uh, because you’re gon na be making left turns and right turns so you don’t wan na bias, one way or the other it’s gon na affect your turning but front right, sorry, front rear, that’s, where you may pick and choose. If you want forward bias and rearward bias, because, depending on your driving style, it can make a difference now, what if you’re saying what about uh center mass, the height of the center mass okay, that one’s a little more challenging generally uh, i take an edge if It’S, a straight just perfectly straight edge, this one’s kind of rounded, but if it’s a perfectly straight edge, you can also do an approximation now for that one. You really want the body on i’m not going to put the body this just for demonstration, but you’re just going to set the car on its wheels and you’re just going to do the same thing. But you want you’re going to want to keep a similar distance and then once the car starts wanting to tip over that’s, where it is, you would mark it so it’s just this is just above the just above the wheel, nuts, all right so it’s, just above The wheel nuts, but then again this is rounded. You want something that’s perfectly. If you have just a piece of uh, maybe some pine uh any type of board.
That’S just has a straight cut. Instead of this here, this grounded edge, uh that’s a lot better, but anyway, then you would flip the car. So you already did this now flip the car and you’re gon na find the other one so it’s, just above uh the nut, and now it actually stops right about. There do the same thing and all right so now we’re right about here. So it means that the first time it tipped it tipped here, the second time it tipped it tipped here. So my center mass is somewhere here so it’s, pretty close to where the hubs are, which is pretty good, so i’m centered – probably just below this here now, once you add the body again, it would probably be at the hubs. If i had the body just because of the weight of the body but that’s how you can get an approximation of where your mass is centered front, right, uh, front, rear, front, rear, left right as well as top down so you’ll find that little cube. Let’S say of where your center mass is so. My center of mass would be somewhere in there, where my spur is, which is actually pretty good, because that’s pretty close to where the two belt uh two belts come in uh but anyway other than that uh again. For those of you that are getting into uh kit, uh touring cars plan going to usgt or vta, this is one method that you can use so that you can find your mass distribution on your touring car, and actually it works not just on touring cars.
You can use this on other vehicles too, such as your short course. Trucks you’re, just gon na need something that’s a little taller because of taller suspension. So you can use this on another vehicles. It it’s just super easy on touring cars because they have a flat chassis, all right well other than that uh. Thank you very much for watching telecommando rc go ahead like subscribe. If you have any other methods, go ahead and leave them in the comments below. Please share your knowledge if you are a veteran of the sport and help us help more people join the hobby. Thank you.