The Sail Speedy has a second version, the Twin Speedy, which has twin motors on the wing in a pusher configuration, for flatlanders. I have an earlier version of this airplane, called the "Turn-On", which is one of my favorite airplanes. Kept light and powered by two 1806 quadcopter motors with 1.3 3S Lipo, it has good vertical and about a ten minute aerobatic flight time. I'm not overly impressed by the yaw authority of the v-tail, but differential throttle mixed from the rudder stick more than makes up for that! This makes for very effective stall turns from a dead stop. One nice feature is that twins with counter-rotating props don't exhibit any torque or p-factor in normal flight, as in the initial pull up to vertical in a maneuver (there is some torque reaction when you use differential throttle, though). The airfoil is compatible with largish outside loops and the aircraft will do a very tall vertical eight. In all, a nicely aerobatic airplane with an easy hand launch (part throttle) and a low landing speed. It encourages throttle management and is only flown at full throttle in climbs.
Aloft does not list the powered version, but it should be an easy conversion from the Sail Speedy if you have building skills. The Twin Speedy has a wing with molded-in motor nacelles on top of the wing. (The Twin Speedy and Turn-On use ferrite motors buried in the nacelles, which is unnecessarily heavy. I glued firewalls to the back of the nacelles in my Turn-On.) To convert the sailplane version, add firewalls at the trailing edge (above the wing) supported by 1/32 in plywood triangles going forward into slots in the upper surface. The centerline of the motors on the Turn-On are 21 cm apart. Mounting screws go through the firewall from the front. Devise some sort of fairing in front of the firewall, leaving the motors in the breeze. I have a similar firewall installation on another foam airplane--the LIDL glider-- and it has held up well. The rest is creating places for wires to run and an unfortunately complicated wiring harness. Note that the fuselage already has depressions behind the wing to give prop clearance--these are a good place to put cooling air exhausts for the fuselage.
The plane is EPS, with the advantages and disadvantages that have already been discussed. I have a lot of hours on mine, and some major repairs, but it is still flying. The fuselage has a good wooden reinforcement in the tail boom, and the interior of the Sail Speedy has been reinforced compared to the Turn-On. However reinforcement by small carbon rod under the v-tail extending to overlap the wooden tail boom reinforcement is a good idea, and I would probably do the same thing in other places where there is not good continuity in the structure's reinforcements. Tape on the bottom regardless of where you land. Be careful of the wing tips.
If there is interest I will write more about the wiring for a twin.
Why the plane has a 1 piece wing is beyond me, but this feature certainly kills it with the high shipping costs that are based on package size. For those of you that got one, please enjoy it and know you may have the last of them brought into the country.
