LMH 110 (1998)
In 1998 the model was updated to the LMH-110 and the Cox 0.51 was replaced with the Norvel Vmax-6 of capacity 0.61 CU, this engine was similarly controlled by a rotary valve in the exhaust system but this time it also incorporated a silencer and thus was much quieter that the 100 model. The following is the introduction from the 1999 version manual; note that the first line is, of course, not true by a long way though the first made in the USA...!!!
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 tipping over 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 noted a new engine was supplied in order to give more performance and better noise control which had been a major problem for the original machine as it could only be operated well away from other people; it was also better for the pilot to wear ear plugs to prevent serious ringing in the ears!!!! Additionally, the open exhaust resulted in fuel residue permeating throughout the whole model thus making it difficult to keep clean; the following is the engine introduction.
The Norvel Vmax-6 helicopter engine takes the model 110 where you want it to go, on inexpensive 15 % nitro fuel. The special venturi and directional intake ports on this .06 cu. in.(1cc) Schnuerle-ported powerhouse are tuned for easier starting and extra lugging power. The rugged Vmax-6 crankshaft is supported by a durable bronze bushing for long life at maximum power. The unique Vmax-6 throttle/muffler includes a tapered slide-valve throttle for more precise linear throttle control. Engine exhaust is directed downward to keep your Model 110 clean and quiet.
LMH-110 Exploded views - 1998 version
Technical Bulletin 06 - May 1998 - Engine problems due to fuel contamination.
Technical Bulletin 07 - May 1998 - Effect of needle valve damage.
Technical Bulletin 08 - Mar 1998 - Recommended fuels for the Norvel engine.
LMH-110 Construction manual - 1999 version and of very high quality and very comprehensive.
LMH Operators guide - 2001 version and supplements the build manual.
LMH-110 Parts list - 1999 full parts list with prices and model exploded views.
Technical Bulletin 09 - Jul 2000 - Effect of fuel line vibration on engine tuning.
Unknown owner.
My LMH-110 for restoration.
Modernised version with OD fuselage crutch.
The engine was upgraded to the Vmax-6B which had the same capacity but better specification and a revised head/sealing ring configuration.