Two different 3 blade MT propellers have been commonly sold for RV's with the Lyc. 360 engine:
The earlier MTV-12-B/183-59,
and the current MTV-12-B/183-59b.
Both of these propeller designs have been vibration tested.
An easy way to determine this for any MT Propeller installation is to refer to the MT Propeller website,
www.mt-propeller.com
Then select service documents,
Then select service bulletins.
Then select service bulletin # 1.
If the TBO is 1800 flight hours, or greater, then a vibration test has been completed for that specific propeller/engine combination.
The -59b blade design is a totally different blade design from the earlier -59 blade design. Although their appearance is very similar.
Van's Aircraft propeller testing was with the earlier -59 blade.
I do not know of any published flight test data from Van's Aircraft using the current -59b blade.
The earlier -59 blade had mid range RPM restrictions in the 2000 to 2300 RPM range.
The current -59b blade does not have a mid range RPM restriction on the Lycoming 360 engine, even with electronic ignition.
From statements made from flight test data in Australia, the MT 3 blade propeller with the -59b blades performs equal to the Hartzell 2 blade blended airfoil propeller.
Since I have found MT Propeller and Hartzell propeller chararteristics to be very dissimilar, I do not take this as an absolute statement. Only that it could have some relative merit, pending additional testing.
Regards,
Jim Ayers