The subject of RV accident causes came up on, for all things, a Dutch homebuilding Facebook page. I put together the attached summary, and figure I'd post the link here.

http://www.wanttaja.com/RV_wanttaja.pdf

The accident database covers 1998-2013, inclusive. The above file is based on the automated summary the database can create based on the aircraft type. It may take a bit of study to understand since it was not designed for routine public use. It’s designed for a weird size only to allow the entire summary to show on one “page” rather than force the reader to contend with page wrap.

The pages cover the RV-3, -4, -6, -7, -8, -9, and -10 series aircraft. The trigear versions (“A” models) are lumped in together with the taildragger ones as the NTSB listings are a bit inconsistent with the nomenclature. Similarly, the RV-12s are not included, as there is uncertainty as to which are Experimental Amateur-Built and which are Experimental or Special Light Sport.

The “Baseline” or “Overall Homebuilt” columns refer to all Experimental Amateur-Built aircraft accidents in the period covered by the database.
The “Primary” column refers to the cases where the particular cause was the initial event that caused accident. The “Both” column includes both these cases, and ones where the cause was a secondary one. The accident causes were based on the author’s own reading of the accident narrative, not on the NTSB’s Probable Cause.

Ron Wanttaja