Spoiler — dimension sheet
Source: Xem Studio, https://xemstudio.com/objects/spoiler/  (sheet CC BY 4.0; files Xem Studio Design License, https://xemstudio.com/license/)
Basis: Design rules and figures from the cited sources; example geometry by Xem Studio
Catalog version: 2026-10-20

Sizes: see table below
- Spoilers deploy from the upper surface to spoil the flow, cutting lift and adding drag; they give roll control with no adverse yaw, descent without speed gain, and better braking after landing (FAA PHAK ch.6).
- Gliders use them to control descent rate (FAA). Drela's 3 m Bubble Dancer RC sailplane uses 'a very big 2 x 36 in spoiler' for landing (CRRC).
- Used on: Bubble Dancer (RC sailplane).
- The file is a reference example built by Xem Studio from the numbers above. Sizes the sources do not fix are illustrative; scale the example to your own vehicle.

parameter  value or range  source
Bubble Dancer spoiler  2 in x 36 in on a 120 in span  CRRC
Reference build  300 x 30 mm panel, 60 deg  illustrative

Files elsewhere (not hosted by Xem Studio; license as stated by the publisher):
- FAA: Pilot's Handbook of Aeronautical Knowledge (FAA-H-8083-25), Ch. 6 Flight Controls — web — Publisher's page; dimensions are facts — https://www.faa.gov/sites/faa.gov/files/08_phak_ch6.pdf
- Charles River Radio Controllers (M. Drela designs): Bubble Dancer 3m RES sailplane — web — Publisher's page; dimensions are facts — https://charlesriverrc.org/articles/on-line-plans/mark-drela-designs/bubble-dancer/

Free files (Xem Studio Design License, Xem Studio; STEP + STL, 1 parts): https://xemstudio.com/files/hardware/spoiler/index.json
API: https://xemstudio.com/api/geometry?object=spoiler