Aug 8, 2011

The Blue Wonder

A few months back, in the AMA Park Pilot publication, I saw plans for the Blue Wonder and decided it'd be the perfect first flying wing build.  You can find the plans here Blue Wonder at the AMA Park Pilot website.

The plane is an easy build however, it requires that you cut six strips of foam then cut a 45 on both edges of each strip.  That is the most time consuming part of this plane, so make sure you have good sharp blades and change half way through the strips and you'll avoid the foam carnage and issues caused by a dull cutter.

For the first power setup, I tried a Turnigy 2204-14T Electric Motor with a 10 amp speed control.  The plane is weighs in at 7 ounces with an 800mah 2 cell LiPo, yet performance was pitiful.  Using a GWS DD-7035 Prop the plane couldn't loop from level flight, and it hardly had enough power to stay airborne for more than a few minutes.

After giving it some consideration, I decided to switch power setups with my Blu-Dart, and to put the 12amp speed control and Park 250 into the Blue Wonder.  The difference was incredible, now this is the fastest plane I own, and its a blast to fly.  The elevon setup makes this plane behave very differently in flight than a ruder, aileron setup.  Test it in a wide open area before flying in tight spaces :)

Aug 1, 2011

Foam Wing - Full Fused Plane

While visiting in Minnesota, my brother-in-law and I built a few airplanes.  He bought 1 inch foam insulation at the local hardware store, which we fashioned into wings with real airfoils.  Using 1/4" foam, I've made many wings with under-camber, but never made a wing with a true airfoil that produces lift.

We didn't go to the trouble of making a hot wire, we simply cut the wing to shape with a razor blade, and then ran it through the table saw on the leading and trailing edge to start the airfoil shape.  We then sanded the wings with foot long wooden sanding blocks and coarse sanding paper.  Starting with 60 grit, we worked our way down to 150 grit, and very quickly had near perfect wing cores.

Here are a few pictures of my plane with the finished wing.  The plane itself is constructed of 1/4" foam, with a  2" block of foam sandwiched into the nose area, giving structural rigidity as well as a place to mount the battery, esc, servos and motor.  There is no wing spar on this plane, the foam provides enough structural support, but spare carbon fiber wouldn't hurt.

Overall its a fun project, but as always, try to keep the weight down or it won't fly very satisfactorily.   This plane weighed in at a little over a pound with the battery.

Turnigy 2217 20turn 860kv 22A Outrunner
1 - 2200 mah 3 Cell LiPo
4 - HXT900 Servos
1 - HobbyKing 30A BlueSeries Brushless Speed Con
1 - TP Slow Fly propeller 11x4.7
1 - 6 channel spectrum compatible rx