Tamiya 72009 - Classic 5-Speed Twin Gearbox H.E. STEM Assembly Kit  [72009]

Tamiya 72009 - 5-Speed Twin Gearbox H.E.
Price:
£11.16£14.98
Brand:
Tamiya
Model:
72009
GTIN:
4950344720095
Condition:
Brand New
Available in shop
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alt="Tamiya 72009 - 5-Speed Twin Gearbox H.E." title="Tamiya 72009 - 5-Speed Twin Gearbox H.E."
alt="Tamiya 72009 - 5-Speed Twin Gearbox H.E." title="Tamiya 72009 - 5-Speed Twin Gearbox H.E."

Tamiya 72009 - 5-Speed Twin Gearbox H.E. kit details

The Tamiya 72009 5-Speed Twin Gearbox H.E. is aimed at model makers and educational users who want to explore geartrain behaviour. It features five selectable gear ratios - 6.1:1, 15.6:1, 40.2:1, 103.3:1 and 265.6:1 - letting you assess how changes affect output speed and torque.

Construction notes and protection

The gearbox has separate right and left halves that click together for straightforward assembly. Each side supplies five mounting components each with three fixing holes for flexible attachment. Clutch gears in the 103.3:1 and 265.6:1 ratios provide overload protection to help avoid gear damage.

Use cases and motor fitment

With hex hubs fitted, the unit can take cruciform crank arms and common R/C wheels, making it adaptable for small drive systems. Two Type 260 motors are included and the gearbox is also compatible with Type 130 and Type 140 motors for alternative performance choices.

Specifications

  • Length: 88.7mm
  • Width: 86mm
  • Height: 27mm (connected)
  • Weight: 140g (with gear ratio of 265.6:1)

Is this gearbox suitable for classroom demonstrations?

Yes. Its clear gear ratio options and snap-together build make it ideal for demonstrating mechanical principles in a teaching environment.

How do the clutch gears behave under load?

The clutch gears slip when torque exceeds a set level, helping to prevent stripped teeth and protecting the gearbox during jams or sudden loads.

Will it accept different wheel types?

Yes. The hex hubs allow fitting of various cruciform-style crank arms and common R/C wheel fittings for small models.

What should I check when swapping motors?

Check shaft fit and mounting clearance, and choose motor types such as Type 130, 140 or the included Type 260 to match desired RPM and torque for your model.

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