AP speed of non-myelinated axons

[Nomegusta]

I have in my textbook a formula for calculating speed of action potential in myelinated axons which is V=k*d where the k is myelination constant and d is diameter of axon.

 

But there is nothing said about non-myelinated axons. I think i read something somewhere about V=square(k)*d but i am not sure.

 

If you know something more write . Thank you!

[Nomegusta]

I found it , it is V=k* square(d)