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???
| 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.
Its the same motor actually.
But you need to drive it with a higher voltage pack.
I've got a mabuchi 380 aka speed 400 doing estimated 26k RPM. It would
need a 5x3 to achieve 20k in direct drive - currently its deeply geared
on an 8x6 doing maybe 6k RPM at the prop.
To do 25k you need a 'long can' 400. And maybe 16V or so. Or a
brushless. So you are right that a stock 400 won't do 30k on a 5x3, but
it will near as damn it do 20k.
Geared the way I have it, its producing as much thrust as the norvel, its only
downside is its pitch speed is around 50 mph rather than 70mph.
So it won't overtake you on a pylon circuit, but will climb just as well.