Jim (et al)...

I would not want to add to any speculation... However, in case your post does cause alarm/distress, some research would indicate an RV-8 was not involved.

Andy
 
The investigators' report has just been published here.

Aside from the tragic circumstances, it shows just what sort of damage an RV can take and keep flying.

The RV-4 was formerly N42BN, built by Tim 'Grumpy" Berry.