I was thinking of an MDS .15 F2A speed motor. Static thrust will be sucky.
PS it is just the wing so far, I was all hot to make a little sport .15 delta in about 2009 or so as I recall, but went on to other things. This would be a 1/16" ply fuse, wing on top.
It would take me all of an hour and eleven minutes to make a new wing. Or just take the .25 Demon proto down to 23-24" and do it proper like with an airfoil. Maybe I should just build a better wing and do something else with this - not worth making big plans around $4 of 1/4" balsa!