Hirobo Bell_UH-1B - 60 (1977)
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Specification:
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 Tail speed up for Flatbed mechanics. |
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60 size for Flatbed mechanics
Whilst forty size engines were suitable for hovering and general circuit work they lacked the urge needed for more spirited flying, unfortunately it would not be possible to fit a larger engine to the model as blade length was limited by body size so as it would require a new fuselage, why not go the whole 'hog' and increase the size to take a sixty.
Revised 'Pitch up' mechanism and belt starting layout.
A number of weaknesses had been identified in the original mechanics and rotor head as noted above so it was decided to attend to these in the larger model. The mechanics now incorporated a parallel 'scissor' mechanism which removed the unwanted pitch-cyclic mixing plus the 'pull start' facility was now optional with standard fitment being the solid flywheel for belt and external starter. The rotor head and swashplate control system was completely revised and now incorporated a 'see-saw' assembly in the control for the flybar such that if the swashplate moved vertically (as in pitch changes) the flybar rod did not move but, if the swashplate 'tilted' the flybar rod followed this movement. It was also decided to model the new rotor head on the 'full size' machine and thus significantly increase the scale fidelity of the model.
Both models sizes of the Bell Huey were to be sold in Tandem in order to cater for those who wanted a big scale model; or those who wanted a smaller scale, easier handling model and as per its smaller brother, the bigger Huey was available as the basic L model for belt starting or the H model with pull starter.
For 1979 an optional main shaft 'free wheel' assembly was available in order to allow autorotation.
1980 electric start option
For the ultimate though adding an extra 0.5 Kg or so in weight, the pull start could be replaced with an onboard electric starter; cost £120 which was the equivalent to the cost of an engine and gyro together so did not really sell to the 'average' helicopter modeller.
Bell UH 1B-60 converted to electro drive:
