DDEngineer app for iPhone and iPad

This is a rig floor Engineering app. One can generate a BHA and reproduce it from the app.
The app allows for Hydraulic Analysis using the Bingham, Power Law and Herschel-Bulkley models, for a certain depth or from a sensitivity point of view.
Torque & Drag analysis can be performed using Soft String model (Exxon-Texas A&M and 3D Friction) and a Stiff String Model with just tool joint contact. The T&D analysis is available for a certain depth, sensitivity and trip logs.
Both Hydraulic Analysis and T&D generate graphical and datasheet output, which can be transferred as pdf files.
A app specific xml allows one to transfer data to other devices using Device to Device transfer, Up/Downloading through a Wifi connection with a laptop web browser as well as through emailing.