Description

This 20 size aerobatic model by Dick Sarplous looks like a small Ultra Sport to me.  It has a symmetrical airfoil and plenty of side area.  It’s very easy to build, too.  There are 1/4″ holes in wing ribs for wing jig rods.

Choose standard ribs for nose wheel, alternate ribs for tail wheel, and also choose standard 1/4″ spars as noted on plans, or smaller notches for 3/16″ hard wood spars.

Get the plan from Outerzone, and you’ll see two fuselages.  The first fuselage is for use with a rear exhaust engine and a tuned pipe.  The second one is for a standard side exhaust engine, or electric if you’re into that.  The parts in my kit are for the second fuselage, as depicted in the photo.

Thanks to Matthew Mulbrook for the photo of the red Hammer that he built.