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Vintage RC Helicopters - Light Machines

  LM - Light Machines Corporation

LMH-100/110

       

LM brought out an unusual helicopter in 1994 called the LM-100.  Though four function it was powered by a small Cox 0.51 size engine which had very little in the way of silencing so was quite noisy for such a small helicopter.  It was fixed pitch with plastic flapping blades but the most unusual feature was the gyro stabilised tail rotor.  This was called the Arlton Gyro and had a small stabilizing rotor controlling the pitch of the tail rotor in a similar way to the flybar controlling the main rotor.  The following is the introduction from the manual 1999 LMH-110 version however, some of the claims are not exactly true???

The Lite Machines Model 110 helicopter is the first mass-produced radio controlled micro helicopter in the world. It is intended as an introductory helicopter for those modellers intrigued by helicopters and helicopter flight, but unable to justify the significant investment in time and money required for traditional helicopter models.  The Model 110 can withstand tip-overs and minor crashes with little or no damage.  Many flight skills such as basic hovering, nose-in hovering, low speed manoeuvring, forward and backward flight, and pirouettes can be mastered without busting the family budget with a larger, more complex machine.  The Model 110 utilizes advanced aerodynamics that enable it to fly on 1/10th of a horsepower which is roughly the power consumed by a 75 watt light bulb. In comparison, .30 to .60 size model helicopters use one to two horsepower (10 to 20 times more).  The fixed-pitch main rotor of the Model 110 helicopter combines Sub-rotor technology and free-flapping, foldable rotor blades in a rugged, high lift rotor system with fewer than half the number of parts found in collective-pitch helicopters. Main rotor lift is controlled by changing the rotational speed of the main rotor rather than varying the pitch of the individual rotor blades (such as with “collective-pitch” type main rotor systems). Fixed-pitch main rotors are substantially simpler than collective-pitch systems and are ideal for beginners. Collective-pitch main rotors allow for advanced aerobatics and engine-off autorotation manoeuvres that are typically flown by more experienced pilots.  The tail rotor mechanism of the Model 110 helicopter incorporates a light-weight Arlton Gyro stabilizer which eliminates the need for an expensive electronic gyro and extra capacity receiver batteries. The unique central keel fuselage structure is simple, strong and easy to assemble and repair - a far cry from the fragile construction of many electric helicopters.  Designed on modern computer-aided design (CAD) systems and computer-aided manufacturing (CAM) systems, the structure of the Model 110 helicopter incorporates eight types of engineering plastics, four aluminium alloys, several high strength steels, aircraft plywood and multiple protective surface coatings.

           

As the engine was specific to the helicopter and buyers would have been unlikely to have one already, the majority of sales were for the 'combo' version that included everything but the radio gear.

Picture of 'LMH100'    LMH-100 review - Full build and flying review (unknown author)

 In 1998 the model was updated to the LMH-110.

LMH-110 Exploded views  -  1998 version

LMH-110 Construction manual  -  1999 version and of very high quality and very comprehensive.

LMH-110 Operators guide  -  1999 version and supplements the build manual

LMH-110 Parts list  -  1999 full parts list with prices and model exploded views

LMH-120A Corona

In 2001 Light Machines brought out a new model which was a 110 that had been fundamentally redesigned for electric power.  The basic layout remained along with the main drive train however, the main frame was redesigned to remove the fuel tank, replace the engine with the electric motor and provide securing for a flight battery.  The Arlton Gyro was also removed as by this time piezo gyro's of a reasonable price were available along with the new small 'heading hold' types and so this option was considered more what the buyers would require.

LMH-120A Construction manual  -  2001 Corona version

LM Technical bulletins  -  Copies of all update and errata bulletins from first release in 1994 up to 2002.

2009

Light machines begin production again of the Corona however this time it has been brought fully up to date for direct drive by a brushless motor; no other info on the model known at that time.

My LMH Helicopters

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