The pictures of the firewall also include the cowling in the background. It's not very sharp in the picture but it's quite interesting. When we walked up to the airplane, everyone thought that nothing was damaged. The cowling was almost perfect. The attachment bolt holes were slightly cracked, but that was it.

The cowling looked perfect. The impact was gentle enough that nothing really happened to the cowling. It's flying today. Matter of fact, here is a picture of the airplane last time out. That's the cowling that came in the ARF box. Notice any damage? The bolt holes have been reinforced inside to reinforce them. But that cowling stopped the engine from moving back any farther after the firewall failed completely.

The firewall failed completely in a situation that did nothing more than cosmetic damage to the fiberglass cowl. That is an issue no matter what engine you choose. BTW, that is the original OS61 in the picture. It's been in the airplane since day one.