| I have a Kyosho Spree electric 2 channel that I converted over to a 3 | channel. I would like to install a nitro engine in her but I would | like to know what size engines would work and be safe ?? What size | nitro engine is equal to the 380 that is installed in the Spree???
It's hard to be sure, but a Norvel 0.061 is probably pretty close (probably erring on the side of more power). With the lower weight (no big battery), it will probably perform even better than the electric motor. You could probably do a 0.09 easily enough, and that would have *plenty* of extra power.
I can't tell what the plane is covered with -- make sure it's fuel proof, and don't forget to fuel proof any exposed balsa. And beef up the firewall -- the stock firewall probably isn't going to handle a glow engine well.
It might require some weight to balance after the conversion -- you won't be able to really move the battery around like you could before. Well you can, but it's a lot smaller, so the effect is less.
Personally, I'd leave it electric. If you need more power, get more cells, a li-poly battery and/or a better motor ... but a glow engine could work too.