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Rans S-9 Chaos (54″) – Plan

Plan for Peter Millers near 1/5th scale model of an impressively aerobatic Group A home built light aircraft. 2 Sheet Plan.

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£16.00 £14.40


  • Name: RANS S-9 Chaos
  • Type: Sports scale
  • Designed by: Peter Miller
  • Span: 54” (1372mm)
  • Wing Area: 500 (0.323 sq.m.)
  • Weight: 61 ozs (1729g)
  • Wing loading: 17.5 ozs per sq. ft.
  • Motor: 4-Max 3541 1070
  • ESC: 40A
  • LiPo: 3S 3000 mAh
  • Propeller :11" x 5.5"
  • Controls: Ailerons, elevator, rudder, throttle

Full Description

The model is about 1/5th scale, which gives a wingspan of 54”. Peters favourite combination of a 3541 1070 brushless motor, a 40-amp ESC and a 3S 3000mAh LiPo would be the right power set up.

So here we have a model that looks great and is pretty easy to build. It weighs 3 lbs 13 ounces ready to fly. This is one of the nicest, best-behaved models that Peter has flown in a very long time – and he’s had quite a few favourites!

Electrical set up is available from 4 Max:

Further building information is available in the October 2020 issue of RCM&E and on

Full size:- The Rans S-9 Chaos is an American single-engined, tractor configuration, single-seat, mid-wing monoplane designed by Randy Schlitter for aerobatics and manufactured by Rans Inc. The Chaos is available in kit form for amateur construction.

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