Originally Posted by RandyAB
It's the exemption that requires the gascolator. Personally I would like to have the option which doesn't exist under the exemption. I also like the placarding rules better under 549 as opposed to the exemption. It frees up panel space.
I just did the wing loading calculation for the base Chapter 549 requirements on the RV-10. These were my inputs:
Wing Span: 31'9" (Vans' website)
Flap Span: 95.515" (measured from Vans' 3-view DWG file)
Flap Mean Chord: 14.1191" (measured from Vans' 3-view DWG file)
Wing Mean Chord: 56.0353" (measured from Vans' 3-view DWG file)
Max Flap Deflection: 33 degrees (only place I could find it is in the UK approval document for the RV-10... If this is wrong let me know and I can re-calculate)
Those numbers give a maximum allowable wing loading of 17.3 lb/ft^2.
With wing area of 148 ft^2 (Vans' website), that means you will have to limit your gross weight to 17.3*148 = 2560lb, or thereabouts, 140lb less than Van allows in the RV-10. If you want to register it at 2700 lb as per Vans' gross weight limit, the aircraft will be classified as High Performance, and you will need a High Performance rating to fly it.
If you build under the exemption, the allowable wing loading is 20.4 lb/ft^2, which would allow you to get to Vans' 2700 lb gross without the High Performance rating.