DeHavilland DH.10 - Airco DH-10 - Free flight scale, electric powered twin model WWI bomber. Uses 2x Astro Flight 020 electric motors.
Quote: "I have been experimenting with multiple engine free-flight models for about a year. The main problem has been keeping the engines synchronized through the power phase. There are systems for doing this with gas engines, but most are complicated and not always dependable. Bob Bouchet of Astro-Flight Inc suggested that I use two electric motors wired to a common battery, and this was an excellent solution to the problem and has worked very well.
I chose the "DH-10" for my test bed because of its inherent stability due to the four degrees dihedral and four degrees sweepback of the wings. The large rudder and stabilizer were also helpful. This model is as close to scale as I could find data for, the only thing that isn't documented is the dashboard layout. You will find that the flight is scale-like also. The rollout for takeoff is long, say about 30 feet, then a gradual but positive climb followed by a cruise to the left in about a 50 foot circle. The descent is gradual and the landing is good.
The most fun I've had is having some of the R/C flyers watch it fly and ask me what frequency I'm on. When I tell them it's Free-Flight their eyes almost pop out of their head. But enough of my DH-10 let's start building yours. The first thing to do is to make an aluminum template of the wing rib and of the false rib. Why first? Because while waiting for something to dry, one can cut 5 or 10 ribs and store them away. As you have to make one heck of a lot of wing ribs, this is. a less painful way of doing so..."
Direct submission to Outerzone.
Update 04/06/2017: added article, thanks to RFJ.
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