Thanx for all the replies..most of the 30 size planes are too heavy for a 30 size 4 stroke..like to have something in 3.5-4.0 Ib range,and can mounted inverted..I seen a Zen 30,made by World Models....can't find any info in regards to it...they don't list it on thier website...anybody know anything about this plane?..thanx again for the info....Merry Christmas