Friday, May 20, 2011

The Pink Delta

The mission: Create a dirt cheap, uber simple, easy to make airframe that works with cheapo components.

I call it the Pink Delta. The Pink Delta came from a variation of the Mugi Evo.


List of parts


Construction


The dimensions of the Pink Delta match the Mugi Evo, except instead of hard to find 2mm coroplast, I used readily abundant 1/2" pink foam insulation from Home Depot.

Steps:
  1. Cut a corner off of the 4x8' sheet of foam, by measuring 800mm/sqrt(2) = 565mm on both sides from the corner, and cutting across the two marks.
  2. Draw out and cut out the elevons and verticle stabs
  3. Glue on verticle stabs. I tried to angle them out, but they are quite uneven. I think next time they will be 90deg straight up
  4. Bevel elevons with razor and back of main delta section to allow full movement of the elevons once installed
  5. Using packing tape, or 3m tape with nylon fibers, install the elevons
  6. Glue reinforcement onto nose. I used some thin plywood I got from the Home Depot scrap bin
  7. Glue motor mount on. The selected motor is a stick mount, so I used a 3/8" dowel from Home Depot and glued it right down the centerline. I plan on switching the motor around to keep the thrust line at the same level as the airframe to hopefully improve handling
  8. Cut holes for servos, battery, receiver, and whatever else you need.
  9. Mount servos, control horns, and electronics. I had some 2-56 pushrods with ball ends for the elevons. The ball joints work fairly well. Most of the electronics are held down with sticky strips of hook and loop material.
  10. Charge battery and fly!

The Result



Notes


I chose not to round the leading edge of the wing to save time due to fear the thing would fly like a rock. It does fly kind of like a rock.  Maybe a light one like pumice.

Flies quite interestingly. The Pink Delta, despite no dihedral, will not flip or roll. The think does not want to go upside down. The controls are overly sensitive, when I get around to it I will add a little expo to th controls.

Some more pictures




Wednesday, May 4, 2011

Some Quadrotor Videos

I came across some videos from my quadrotor senior design class from college. Figured I'd throw them up!

Successful Demonstration Flight


Video one of my teammates took


Some 'Outtakes'

Tuesday, May 3, 2011

Kick off with a 'Boot' (That means 'Boat' in German)






List of parts

Some lessons that I've learned

  1. Keep weight low. The closer to water the less likely your precious creation will end upside-down
  2. A smaller prop keeps the motor lower, and easier to keep the weight low. Select a motor with a higher KV to allow for a smaller prop.
  3. Keep the boat nice and long. This keeps you from creating a water plow.
  4. Waterproof your parts. A little water in the motor won't kill anything, but ESCs are particularly sensitive to moisture. Receivers will tend to rust pretty quickly when wet. A cheap disposable tupperware or even dipping the ESC and receiver in epoxy seem to work.
  5. Components get hot when there is no ventilation and when they are surrounded in foam. Let me know if you figure out a cheap solution to this...
  6. Fasten the battery down. Failure to do so could lead to the boat flipping over in the middle of the pond at the local golf course.

One of my friends built one, too. Hopefully we'll get a video of them racing