10. FAQ


Q) How do I get my copy of Hydrostatics Calculator?

A) Download the Hydrostatics Calculator executable, run it, and follow the on-screen instructions to request either a Trial License or a Full License. In case of a Full License, make sure you are requesting it from the computer that you intend to use Hydrostatics Calculator on. If you do not have Internet access on that computer, copy the Hardware Key at the bottom of the window, and send it to us at This email address is being protected from spambots. You need JavaScript enabled to view it. along with your name.

Q) What kind of hulls does Hydrostatics Calculator support? What about catamarans, paddleboards, asymmetric hulls?

A) Hydrostatics Calculator supports pretty much every hull imaginable, ranging from a bathtub rubber duck, through a ballasted keel sailing yacht, to a half a million ton oil supertanker. Model boats, paddleboards, surfboards, hydrofoilers, water birds, floatplanes - you name it, we've got it. Throw a flower pot into the Hydrostatics Calculator, and it will show you how that pot floats. Please note that there are some calculation simplifications when dealing with multiple underwater bodies, described in section 4.1. 

Q) What about submarines?

A) While the Hydrostatics Calculator wasn't designed with submarines in mind, you can still use it that way. Set the Displacement or Draft just a tiny fraction below the maximum possible Displacement or Draft, so your submarine is almost completely immersed, and the calculations won't be affected much by the minuscule surfaced part of the hull.

Q) How do I start using Hydrostatics Calculator?

A) Refer to the section 1 of this manual (Getting Started) for setting up your copy of Hydrostatics Calculator, section 3 for preparing your SOLIDWORKS model, and section 5 for explanation how to use the available Operation Modes. These sections cover the basics, but it is highly recommended that you go through the whole User Manual to become fully familiar with the usage of this software. Additionally, check out the video tutorials on the Floatsoft channel on YouTube.




Q) I have SOLIDWORKS open and I try to run Hydrostatics Calculator, but it fails to connect to SOLIDWORKS. Why?

A)  1. Check if you don't have multiple instances of SOLIDWORKS running. Open the Task Manager, and search for SOLIDWORKS instances - there should be only one. If unsure, restart your computer, and try again.

     2. Check if your anti-virus is not blocking the application. If you're unsure, add Hydrostatics Calculator to the Exceptions list in your anti-virus settings.


Q) I get an error "Hydrostatics Calculator failed to perform a required operation with this hull model", and it keeps repeating. What do I do?

A) The cause for this error is an imperfect Operations3 API call implementation by SOLIDWORKS that Hydrostatics Calculator uses to cut the model hull at the waterline. This operation sometimes fails at a very specific hull orientation and immersion. If this occurs repeatedly, try to reduce the complexity of the model (roll back the Feature Tree to skip the features that are irrelevant to the hull hydrostatics), or try a slightly different Displacement or Draft value. Sometimes deleting the .mem file in the Memory folder for your model will cause the Hydrostatics Simulator to take a different approach to solving your calculation, and skip the problematic immersion.


Q) I have an issue that is not covered in this manual. What do I do?

A) Contact us at This email address is being protected from spambots. You need JavaScript enabled to view it., and describe your question or issue. We'll get back at you as soon as possible.

Q) My license stopped working!

A) Most likely you modified your computer hardware, and Hydrostatics Calculator doesn't recognize it anymore. Contact us at This email address is being protected from spambots. You need JavaScript enabled to view it. with your new Hardware Key (visible at the bottom of the Authorization window), and we'll issue you a new Activation Key, free of charge. Please use the same e-mail that you used when buying your license, so it's easier for us to confirm your identity.



Q) Hydrostatics Calculator is missing a feature that I'd like to see. Can I request it?

A) Sure thing. Use the Feedback button in the Main window, or send your feature request to our team at This email address is being protected from spambots. You need JavaScript enabled to view it., and we'll look into it. If it is a reasonable request, we will include it in the next Hydrostatics Calculator update.

Q) What is currently planned for the future versions of Hydrostatics Calculator? 

  • Performance improvements;
  • Adding the ability to perform natural buoyancy simulation past the point of no return, i.e. with an inverted hull;
  • Bug fixes!