Roark Formula in Prime 3.1?

Type it in.

Might try Knovel (if you can access it.)

I have converted this formulas into Mathcad Prime for Knovel.

But I cannot Know can get its somebody. I must ask!

The Mathcad 15 HNDBK E-book "Roarks" is a collection of work sheets that can be accessed individually. It should be possible to "convert" the relevant sheet to Prime 3.1 just as you would convert any work sheet. (Assumes you have version 15 and the handbook.)

Here is a quote from thread MathCAD Prime 3.0 & Roark Toolkit, possible? by Thomas Devaraj from PTC:

"Today you have the option of buying Roark's in Mathcad 15 format. We are working on making the Mathcad Prime version available later this summer (2015). Look out for an announcement when this becomes available."