When the first SIG KADET came out in 1972, it was the only airplane on the market totally designed from the ground up for learning to fly R/C. It quickly became the airplane of choice for new R/C flyers at many model clubs! Since then, thousands of new pilots have successfully learned to fly R/C with a KADET!

"The R/C trainer with a BIG difference"

It's gentle flying characteristics made it a legend in its own time. This KADET LT-40 blends the perfect aerodyamics of the original SIG KADET with a more modern, simpler, and much faster building type of construction. Like all SIG KADETS, the KADET LT-40 behaves perfectly in flight, with true hands off stability on all axis. If the student pilot gets disoriented, simply let go of the control sticks and the LT-40 will recover itself and return to level flight within seconds.

Because the LT-40 is bigger than the average .40 size trainer, it has a much lighter wing loading, which lets it fly slower! Slower speed gives the student pilot more time to think and react to what the model is doing, thus making it easier to learn to fly R/C.

This is the easiest building KADET kit yet! Every major part of this kit has been pre-shaped, sawn, die-cut, laser-cut, routed, or whatever it takes to make it ready-to-install right out of the box. A photo-illustrated assembly manual takes you through every step of construction and pre-flight.

Wingspan 70 in 1778 mm
Wing Area 900 in² 58.1 dm²
Length 57 in 1447 mm
Flying Weight 5.5 - 6 lbs 2490 - 2720g
Wing Loading 14 - 15.5 oz/sq ft 43 - 47 g/m²
Radio Required 4-Channel with 4 Standard Servos (not included)

Engine Required
(not included)

Set Up Specifications



















2-Stroke .40 - .46 cu. in. (6.5 - 7.5 cc)
4-Stroke .40 - .54 cu. in. (6.5 - 8.8 cc)


Elevator     9/16 inch 14 mm Up and Down    
Rudder   1      inch  25 mm Right and Left  
Ailerons Up   3/8 inch 10 mm      
Ailerons Down   3/8 inch 10 mm      
Center of Gravity 4      inch 102 mm From the leading edge
Dihedral   3      degrees 3 degrees Per Wing Panel  
Incidence   + 1-1/2 degree wing, 0 degree stabilizer      
Engine Offset  6 degree down,  6 degree right      
    English Metric Number Required  
Main Wheels   3      inch 76 mm 2    
Tail Wheels 2  3/4 inch 70 mm 1    
Fuel Tank   8 ounce 237 cc 1    
Spinner   2 inch 51 mm 1    
Covering   3 rolls depending on trim scheme  

KIT FEATURES- The LT-40 includes these items that other trainer kits do not.
  • Fuel Tank
  • SIG Spinner
  • Wheels
  • SIG Easy Hinges
  • Engine Mounts
  • Decals
  • Ultra-simple Lite-Ply Fuselage
  • Top Quality SIG Balsa, Plywood, and Spruce
  • Simple, Strong Wing design with Spruce Spars
  • CAD Drawn Plans for precise parts fit
  • Complete Hardware pack includes Control Horns,
    Pushrods, Wheel Collars, etc.
Kadet LT-40 Kit Instruction Manuals
Click each title to open in a new window.
Complete Pdf (5.2 Mb) Download

Collections: KITS, SIG KITS

Related Items