Just looking for any creative way to mount cox engine. Would like to use one engine on several planes. Any ideas would be helpful Thanks John

If a radial mount, I can tell you a couple of ways NOT to do it: 

1)  DON'T put metal posts (nails) through the firewall from the back, then slip the engine over the posts and secure it with rubber bands around the posts and stretched back to a dowel.  Looks like it would work good, shock-absorbing quick-change mount...till you crash.  Then the engine rocks on the posts, as intended, and breaks its lugs off, which was not intended.  Wasn't satisfied with destroying a plastic backplate that way; I had to go and find it would break a metal one as well. 

2)Then I tried putting the nails, not through the firewall, but just through the lugs from the back, so the heads rested on the firewall...now the posts would move with the engine, no strain on the lugs, right?  WRONG.  Took a little longer to break, but still did so from the strain of the rubber bands trying to pull the posts sideways. 

But that ain't what you asked, is it?

--Ray

I have several engines.Baby bee ,golden bee, killer bee and one that I think came from a plastic plane has a slide in mount of some sort. It always seems that my daughter wants to use witchever plane doesn"t have an engine on it. Thanks

The 2 firewall system described above is exactly what the Carl Goldberg Wizzard 1/2A trainer used. There are ears on the corners of the firewall about 1/4" by 1/4", and you wrapped a couple small rubber bands around the top and bottom pairs to hold the engine on.

You could probablt retrofit a similar system to an existing model by making a firewall with ears and mount the engine to it, then adding some dowel or small screw eyes behind the existing firewal on the model to hook the rubber bands to.