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You’ve done great with your first trainer and you still have a perfectly good .40 size engine and 4 channel radio. Now is the time to step up and start having some real fun.
SIG’s Four-Star 40 has been the “second airplane” of choice for thousands of modelers since its introduction in 1989. With its low semi-symmetrical wing and light wing loading, the Four-Star 40 takes you to the next level, with all the free-style aerobatics and whoop-dee-doos your thumbs can conjure up.

Optional Molded Plastic Wheel Pants for the Four-Star 40 Kit.
Order No. SIGSH378

When developing the FOUR-STAR 40, there were two main design goals.

First, of course, was impeccable flight performance in the tradition of all SIG kits.

Second, it had to be ultra-simple to build without looking like a “box with wings”.

The FOUR-STAR 40 shines in both respects! Give it a try – we think you’ll give this kit a “four star” rating!

Wingspan 59.75 in 1518 mm
Wing Area 604 sq in 39 dm²
Length 47 in 1194 mm
Flying Weight 4.75 lb 2150 g
Wing Loading 18 oz/sq ft 55 g/dm²
Radio Required 4 Channel, 4 Servos (not included)
Engine Required
(not included)Set Up Specifications 
















2-Stroke .40 – .45 cu in (6.5 – 7.5 cc)
4-Stroke .40 – .50 cu in (6.5 – 8.2 cc)

Elevator   1/2 inch 13 mm Up and Down
Rudder 1 inch 25 mm Right and Left
Ailerons Up   5/8 inch 16 mm
Ailerons Down   1/2 inch 13 mm
Center of Gravity 0 inch 0 mm At Main Spar
Dihedral 2 degrees 2 degrees Pre Wing Panel
Incidence +1/2 degree wing, 0 degree stabilizer
Engine Offset 2 degree down, 0 degree right
English Metric Number Required
Pilot 2 inch 51 mm 1
Main Wheels 2  3/4 inch 70 mm 2
Tail Wheels   3/4 inch 19 mm 1
Fuel Tank 8 ounce 237 cc 1
Spinner 2 inch 51 mm 1
Covering 3 rolls depending on trim scheme
  • Lite-Ply Fuselage Construction
  • Pre-Cut Sheet Balsa Tail Surfaces
  • Durable Aluminum Main Landing Gear
  • Molded Canopy
  • Full Size Plans
  • Fast-Building Wing with Spruce Spars
  • Photo-Illustrated Assembly Manual
  • Laser Cut Parts
  • Sig Easy Hinges
  • Push rods
  • Hardware Pack
  • Large Decal Sheet
Four-Star 40 Kit Instruction Manual
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Complete Pdf (2.0Mb) Download


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