Okay, let's go on now to V belts. With a V-belt, instead of a flat, flexible

drum, and a flat belt, what we have is a, a a v

type situation. The equation that relates TL to T

small, or T sub L to Ts, is slightly different because it includes this

angle 2 delta of the, of the V, and 2 delta is typically

between 30 and 38 degrees.

And so let's look at a demo of this situation.

Here's a pulley you can see that it has a V type shape.

And the angle is somewhere between 30 and 38 degrees.

And then V belt seats right into that pulley.

And then you can have a tension on one side, and the other.

And so a very real world situation that I'm sure you've, you've encountered.

So, let's look at the advantage

of that.

We're going to look at what the increase in

fiction is with a V-belt vs a flat belt.

So here are my relationships for the V-belt,

the flat, flexible, flat belt and the V-belt.

So let's put in some typical values, so we'll use U of 0.26.

we'll use two delta, the V-belt angle of typically 30 degrees,

anywhere from 30 to 38 degrees, and we'll say that beta

is pi. And so if I put those values in, I see

that if I had a small tension resisting of 100 pounds, the increase on a flat,

flexible belt would be 226 pounds, or an increase of 2.26.

However, if I use a V belt now we're able to increase the tension

by 23.5 times. And so you're able to hold or, or, or,

or resist 2350 pounds with, with 100 pounds.

And so you see that there's an increase in the V-belt

over the flexible flat belt situation by more than ten times.

And so that's, that's quite substantial. And so next time we'll come back and we'll

Actually do a problem which involves these belt friction situations.