I put them on any of the scratch planes I've built. They are the best engine insurance you can get. I've had some awful crashes and I have yet to damage an engine, even after blowing apart the spinner. They allow just enough give to prevent breaking the engine. They also eliminate damage due to prop strikes on rough landings. This was very important to me as a rookie. I used to buy props by the dozen, and when I was flying wood props, I would go through three a day.

I also like the ability to drill and tap the proper size screw holes for mounting the engine.

I have an old quickee 500 that uses the Dave Brown composite mounts. I've broken two of the mounts in the last month, the only damage in one case. The shock mounts would have eliminated this problem.

The only down side, especially for a four stroke, is the extra length length away from the firewall. If you are inside a cowl, it may not be possible to change over from a stock mount to the dubro mounts due to clearance issues. Botom line though if you can use the, do.

Don