| Manufacturer: | Scratch |
SCREAM
| Quantity | Item Description |
|---|---|
| 1 | Scream Ornament / Doll ( I hung it from my rear-view mirror til I made it into a rocket ! ) |
| 1 | One Liter Plastic Bottle ( Dr. Browns Cream Soda ) |
| 1.75" | BT-50 used inside of Head / Nosecone |
| 12.5" | BT-50 Body Tube |
| 1 | Spent 24mm Estes Motor |
| 10" | 1/4" Aluminum Tubing |
| 2.5" | 1/4" Aluminum Tubing |
| 1 | 24" Chute |
| 1 | Screw Eye |
| 30" | Elastic Shock Cord |
| 3 | Lexan Fin, 1/16" thickness, 5.25" X 3.25" |
Construction Details
Cut off the threaded screw-on portion of the bottle and opened it up enough to accommodate the BT-50 motor mount tube. Drill and ream a similar hole in the bottom of the bottle. Using a phillips head screwdriver heated over a stove burn a hole to accept the 1/4 inch aluminum tubing to be used as a launch lug in the top and bottom of the bottle.
Epoxy the screw-eye into the nozzle end of the spent 24mm engine. The end of the screw-eye should bite into a small piece of quarter inch balsa inserted into the ejection end of the spent engine case.
The 10" long, 1/4" diameter tube is inserted through a hole burned in the ornament head by hot screwdriver and epoxied to the 12.5" piece of BT-50 glued to the spent engine. Glue the 18" long aluminum tube to the 12.5" BT-50 tube even with the top of the tube. One sixteenth inch holes are drilled into the root edge of the lexan fins ( epoxy rivets ). Attach the fins with epoxy and apply liberal fillets. Epoxy the bottle onto the BT-50 and push down to the leading edge of the fins. Attach the shock cord and parachute in the usual manner.
Flight History
I do not have a computer simulation program so I used the cardboard cut-out method for CP/CG determination.
SCREAM has flown successfully over a dozen times, despite the fact that the LCO's always refer to it as a "heads up flight"
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