RE: what kit for .15 size engine
The SIG Scamp or Colt are good ole classics, but I don't believe they are still in production. Try looking
in the RCU classifieds or on EB*y. They fly great & are a simple build but are
3 channel & you were looking for a 4 ch model.
House of Balsa has a few nice kits worth checking out, a profile Extra and a "Stick" type and even a
neat Seaplane...which is on my build list.
Let us know what you end up with. 15 size engines can provide lots of fun & IMHO much less hassel than
the 1/2A stuff for about the same costs.
Scott