Saturday, August 4, 2012

Mission Space: Bixler Transportation Building Instructions

My original idea for the transportation involved wood, foam, and cement cylinders. After conversing with my father we put our ideas together and came up with an easier, lighter, and more effective design...classic engineering.

The new idea consists of a PVC tube frame with cement cardboard cylinders cut in half, and surrouded with bubble wrap. This blog will give step by step instructions on how to construct the transporter. Enjoy.

1. Buy all the necessary supplies

  • (2) 10 foot 1.5 inch diameter PVC piping 
  • (5) 1.5 inch diameter PVC caps
  • (1) 1.5 inch diameter PVC 4 way attachment
  • (1) 1.5 inch diameter PVC T attachment
  • (1) Roll of bubble wrap (I used large bubbles, 12 inch wide sheets)
  • (1) Bottle of spray contact cement (spray-able glue is just as good)
  • (1) Roll of Velcro straps
  • (10) 1 to 1.5 inch long screws
  • (10) Washers to fit your screws
  • (2) 4ft x 10in cardboard cement forms 
  • (1) 4ft x 8in cardboard cement forms
  • A large, flat surface to work on.
2. Cut the PVC pipe to size. From left to right. Left Wing = 32", Right Wing = 32", Front Fuselage = 22", Back Fuselage = 18", Left Tail = 14", Right Tail = 14", also pictured are the 4-way and T attachments

3. Attach end caps to all the pipe, EXCEPT FOR THE BACK FUSELAGE!!! Use PVC cleaner and PVC cement to properly attach each cap. 



4. Now with the end caps on the other pipes, take the back fuselage pipe, which DOES NOT have an end cap on it, and attach the T and 4 way attachments to it (using the cleaner and cement). Make sure the T and 4 way attachment are straight, to do this I placed it on a flat surface and pushed down on the pipe.


5. Now attach using the cleaner and cement for the PVC, the front fuselage to the top section of the 4 way attachment.

6. After attaching both the back and front fuselage pipe, now using the cleaner and PVC cement, attach the right wing pipe to the 4 way attachment

7. Now attach the left wing pipe the same way you did the right wing pipe. You should notice that the frame is slowly taking the shape of the plane. 

8. With the fuselage and wing pipes attached, its now to take care of the tail piping. Clean and cement the right tail PVC to the T attachment

9. Do the same thing to the left tail PVC, it should now look like your plane. NOTE: I purposely over measured the wing and front fuselage piping so that the piping would hit the side of car or truck instead of the plane's fragile parts.

10. Now with the PVC frame all set, its time to cut the cardboard cement forms. You want to cut each one in half long ways, as shown. The way I got a straight line is I taped a straight line within the form before cutting. Came out surprisingly straight.

11. Do the other side of the form so you end up with two halves. Repeat step 10 and this step until all three forms are cut in half and now have 6 half cylinder forms. 

12. Now cut each half cylinder to its proper size. NOTE: I later found out that the fuselage cylinder (first one from the left), was a waste...ended up NOT using it in the end. From Left to Right. Fuselage = 48", Right Wing = 33.5", Left Wing = 33.5", Right Tail = 15", and Left Tail = 15".

13. Now its time to attach the cylinders to their proper spot. The first cylinder that went on was the left wing, no reason. I pushed the cylinder up to the lip caused by the 4 way attachment. I then pre-drilled the hole and screwed in the screw, WITH the washer. I then went to the end, where the cap was, made sure the cylinder was straight, and pre-drilled the hole and screwed in the screw with the washer. Then for extra safety I put another screw with washer in the middle (eye balled it)

14. Do the same as step 13 just this time for the right wing. The cylinder will go pass the cap, did that just for more protection for the plane. Also put the plane in it to see how it fit, pretty well if I say so myself.

15. With the wing cylinders finished, do the same for the left and right tail. Notice that I only used two screws and washers this time...didn't think it needed more than that. 

16. If you did everything right it should look like this. 

17. Now with the frame and cylinders constructed, its time for the bubble wrap and spray glue. Put a painter sheet down onto the floor and under the transporter, or you will have very sticky floors. 

18. Before spraying read the directions on the can. For the type I bought you had to spay the two surfaces, wait 15 to 30 seconds and then apply. NOTE: I sprayed the bubble wrap with the BUBBLES UP. After spraying and waiting apply the sheets to the cylinders. NOTE: The tail cylinder only had one sheet of bubble wrap while the wing cylinders will have two. Did this for extra protection.

19. With the first sheets on, spray the surface of the wing cylinders and the second sheet and apply it, just like step 18. 

20. Let the glue dry, once dry put the plane inside the transporter. Then take the Velcro straps and sucure the plane in place with it. You can screw the straps to the PVC so you know its completely attached to the frame. 



21. Put it in the car and go fly!











Mission Space: Building and Pre-flight

Goals:

  • Build the transporter for the plane
  • Assemble and connect the telemetry 
  • Drive around in the car again and this time see what happens with the help of the telemetry and R/C
  • Try and fly the plane...depending on how far I get today
Accomplished:

Friday, August 3, 2012

Mission Space: Bixler Transportation

Goal:
Figure out how to transport the drone when fully assembled

Idea:
The ides is partially taken from an idea give to me on diydrones.com. Basically the base is made of wood. Then 2x4s are put in place and surround the fuselage so it doesn't move during the car ride. Then the wings and tail are put into cardboard concrete filling cylinders.

Possible Problems:
  • Cylinders may not fit the wings
  • Will I need the cylinders?
  • Will I need to add dense foam?
  • Too heavy?
  • Too big?
  • Will the wings need to be glued
    • If not, it will make the transporter idea smaller and less complex.

Monday, July 30, 2012

Mission Space: R/C Controller and Telemetry

R/C controller:
Today I decided to buy a 5 channel R/C controller. I bought the Spektrum DX5e tx and rx. I decided to go against my original thought and buy it. Buy buying it, it will make everything easier to do such tasks as switching the modes. Also, I now have a way to save the plane if it goes out of control.

Telemetry:
I also received the telemetry kit from DIYdrones.com. With this, hopefully I can see which mode I'm in without the Ardupilot being plugged in . I now need to solder the prongs to the board, and hook it up to the Ardupilot.

Saturday, July 28, 2012

Mission Space: CLI logs

What is it?:
CLI logs, or Common Line Interface, is data stored within the board that tell information like the telemetry does. This info includes sensor readings, GPS info, and flight mode info. Only problem is, you have to wait till the plane is grounded before you can read it.

What it did for me:
For me I saw only GPS and alt. readouts, and no readout regarding which mode the plane was in. Because of this I can infer that the plane was never truly in auto mode but I will need to look more into it. I really don't want to use and R/C tc/rx if I don't need to.

Next Step:
Figure out how to have the plane in auto mode right from the start. This is crucial because once I get the launch planes attached I wont be able to switch them all into auto mode.

Mission Space: Setting and Executing waypoints

Goals:
  • See if the plane can go to auto mode w/o there being an R/C tx/rx
Ideas
  • Manually put command in the computer board through mavlink software
  • Put in the waypoint and test the commands
What Happened:
  1. Put the waypoints in, #1 being where I was in the car (to simulate the flight) command: takeoff
  2. #2 waypoint was down the street, its command: waypoint, meaning just go to the #2 waypoint
  3. #3 waypoint had no long. or lat. but its command was to RTL (return to launch)
  • Pressed auto mode when plane was connected 
  • Motor started to run, assumed it was in take off mode
  • Drove down the street, saw plane move and try to keep a straight line
  • Once it hit waypoint two at an intersection, the motor turned off
  • Tried to troubleshoot by adding waypoints, changing commands, but nothing worked
  • Went on to learn about CLI logs and its importance

Friday, July 27, 2012

Mission Space: Research Day

Accomplished:
Today was a relatively lite day due to the last couple of days of frustration and learning. Today I started my research on both telemetry and video/OSD. After learning more about telemetry through DIYdrones.com and the internet, I decided to buy a kit. I bought the 3DR radio telemetry kit - 915 MHz, and some cables for the servos. I then did some extensive research on video/OSD options. I found out the on screen display or OSD, is like telemetry with a live video feed. The problem I came across was how does the video transmit and receive? After going on the internet I learned that there needs to be a transmitter on the plane and a receiver on the ground. Still need to do some more research on which camera to buy.

Questions:
  • Which FPV, first person view, camera should I buy
  • Is OSD necessary now that I have telemetry?
  • Once received how will the video come up on my laptop?