Descon Stop Sign

Scratch - Stop Sign {Scratch}

Contributed by Barry Lynch

Manufacturer: Scratch
(Contributed - by Barry Lynch)



Stop Sign

STOP SIGN was inspired by a rash of lawn darts last fall. I figured if I planned ahead for a cool lawn dart it would not occur ­ and so far it has not! The plans are as follows:

  • Parts List:
  • 1 3" Body Tube LOC or Phenolic of your choice (mine was free from Freedom 7 contest)
  • 1 38 mm Motor Tube LOC ­ 16"
  • 1 3" LOC Nosecone
  • 2 Centering rings (Cr) 38mm-3"
  • 1 8-12' Tubular Nylon or Nylon Rope
  • 1 36" Skyangle Chute
  • 1 T-Nut with matching bolt
  • 1 Screen Door Clip
  • 1 Eye Bolt
  • 4 6x12 sheets of 1/4" aircraft plywood
  • 9 oz lead shot
I wanted the rocket to look like a stop sign from any direction it was viewed from which made it difficult to judge the exact size of the fins ­ I settled on 4.5" octagonal fins and mounted them in a TWT configuration.

Simplified directions are:

  • Build up a motor mount with CR on each end
  • Drill a hole in the aft CR for the T-nut and in the forward CR for the Eyebolt
  • Epoxy everything up nice
  • Epoxy the 4 fins to the motor mount at 90 degree separation
  • Slit the 3" BT to allow for the 4 fins ­ use a hobby knife or dremmel tool
  • Slide the Motor Mount and fin section into the BT and epoxy well. Fillet everything.
  • Attach a quick connect to each end of the tubular nylon or tie nylon rope to eyebolt and to nosecone.
  • Attach Chute to above about 20" from NC
  • Paint the BT to look like a post and the Fin area to look like a stop sign ­ I chose the old fashioned signs that were around in rural Missouri when I was a kid.
  • Add 9 oz lead shot to the nose cone with just enough epoxy to hold in place
  • Shove an I-211 in the thing
  • Use the screen door clip on the bolt in the T-nut to keep it in the rocket
  • Flies real nice



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