yeah there is only the rb.28
the .46 might have heaps of power but its just a s h ! T airoplane
engine and the .46 rips the gears up as well
the only reason i would get a .46 if it was cheaper and if i had aliminium gears
DKD
my lhs was making one for a guy with 2 siro 27's
was it custom built or was it a kit (newera)