An F1L prop at the top and a VP equipped F1R prop at the bottom.
The heart of your indoor duration model is undoubtedly the propeller – learn how to design and build them here. This is a 26 page article based on an original by Bob Bailey and updated to include recent F1D propeller construction methods by Tony Hebb.
This is a link to a spreadsheet that will help you draw up a Larrabee style propeller shape – click here.
Here’s a spreadsheet that will calculate either Pitch or Blade Angles for you at different radii along your prop blade.
Finally this is an article by Brett Sanborn – with permission of INAV – on constructing Carbon Fibre prop outlines.