Description

Accepting orders for Final Rules compliant kits which will begin shipping September 7.

Twister is a beginner friendly helicopter which complies with the draft Science Olympiad Helicopter rules for the 2025 season. Construction is greatly simified by the use of pre-angled plastic rotor hubs. Includes parts for 2 complete helicopters and enough  flight rubber rubber for several contests. In a large living room this model flies 50-60 seconds.

Twister 2025 Draft Rules Build Manual V1.0

Tools/materials required: rubber lubricant, winder, CA glue (or Duco/Ambroid/Sigment), 3M-77 spray adhesive, vaseline, razor blades, sandpaper, ruler, scissors. Don’t forget a Check in Box!

Optional: Torque meter, turns counter (volareproducts.com), scale, forceps. 

Recommended replacement rubber is 1/8″ rubber strip.

Basic flying notes: Don’t expect much of a climb until you’ve hit 300-400 turns. Full power is around 700-800 turns typically. Make sure the rubber is well lubricated with silicone oil and that you are stretching the rubber 4-5 times relaxed length, winding in half of the turns before working your way in.

J&H Aerospace is not affiliated with Science Olympiad; this product listing does not constitute an endorsement by S.O.

Flight demo:

Legacy Twister build data:

Updated jig and bearing arrangements:

Build instructions: