In another thread, I was whining about how I always crash my Sky Surfer because of incompetence/wind/CG/weight/motor. I've been looking at flying wings because of their better handling in high(er) wind conditions, and because I'm getting a little tired repairing my SS.
Since it was Thanksgiving and I had some time on my hands, I decided to scratch build a flying wing using Dollar Tree foam. Pretty basic flying wing. I used the wing layout from the BajiWing and basically made everything else up.
- Wingspan: 52"
- Center section: 12"
- Root Chord: 12"
- Tip Chord: 6"
- Aspect Ratio: 5.17
- CG: ~13% static margin, 7.23" from LE
- Fully loaded AUW: 3.6lbs (57.6oz)
- Wing Loading: 15.86 oz/ft^2
- Theoretical stall speed: 20 mph
It's a standard cambered Armin-style wing. I wasn't paying attention and totally screwed up the camber. It's huuuge - around 2.5" tall at the root. I honestly have no idea how this will affect flight dynamics. I'm hoping I can overcome aerodynamic inadequacies with a stronger power system (the old "anything can fly with a big enough motor" maxim)
(My poor, sad Sky Surfer in the background)
It came out a lot heavier than I intended. Being sick of repairing my Sky Surfer, and knowing how fragile DollarTree foam is, I reinforced the wing with several layers of bond paper and PVA. Between that and wooden dowel rods...it came out significantly heavier than I expected. Whoops. It is rock solid though, going to take a lot to smash it up.
The plane holds two 2200mah batteries and a GoPro, but I'm going to leave the GoPro and one of the batteries off until I get a feel for flying. Should help bring some of the weight down.
These pictures show a 1900kv / 6x4 prop combo because that's what I had laying around. I'm upgrading this to a more legit 1400kv / 9x6 combo which should provide ample power.
GPS is mounted on one wing tip. I've had a horrible time getting the GPS to acquire satellites on my SS, so I'm hoping the long distance between VTx and GPS will help. Also all the usual things to help (ferrite rings, LC filter, low pass filter on radio Tx, etc)
5.8Ghz cloverleaf mounted on opposite wingtip. The VTx is mounted mid-wing with a little cutout so the heatsink can get adequate airflow.
Interior is a bit more cluttered than I would like, but about a gazillion times cleaner than my SS. Everything is relatively easy to reach and service.
All in all, it was a lot of fun to build. Even if it doesn't fly, or I smash it into pieces, the frame cost roughly $4. I'm planning on getting a real flying wing at some point, but hopefully this tides me over.