Description

An unknown number of Twister 2025 kits were shipped during late September through October 25 with defective bottom rotor hubs. Please contact us immediately if your bottom rotor hubs do not have a fully formed hole for the shaft so that we can either send replacements or instruct you on how to correct the problem.

Twister is a beginner friendly helicopter which complies with the Science Olympiad Helicopter Division B and C 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 Build Manual V1.1 (accurate for all versions up through V1.1)

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: