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Classic Tamiya QD Super Sabre "technical review"
The Tamiya QD series (1/14 scale) are advanced toy grade cars that were many people's entry into the world of RC cars hobby.
The transmitter electronics have the OKI L9362 encoder integrated circuit and the encoded output is on pin 9.
There are two internal potentiometers for steering and propulsion adjustment. The transmitter has channel 1
as throttle and channel 2 as steering (in reverse of a hobby-grade transmitter).
PPM signal on pin 9 of the OKI L9362 i.c.
The circuit diagram of the transmitter:
This buggy was powered by 8 AA batteries. I have removed the battery terminals to insert a
9.6V NiCd (Ni-MH) battery.
To disassemble, you remove the body (3 screws) and an electronics cover (4 screws) on the car.
The car circuit board
The power supply connector is soldered as seen in the picture. There are two holes to adjust the
neutral of the steering and throttle on the circuit board.
The electronic board has the OKI L9367 integrated circuit; pin 16 is the input signal coming
from the receiver and on this pin you can see the amplified PPM signal. This one is the diagram:
The 27Mhz receiver, demodulator and intermediate frequency filters is very similar to
the diagram shown in the OKI L9362 datasheets:
And the signals are these:
The rear wheels have a 6mm hex axle; the hexagon can be pulled out: it is inserted into
the splined shaft. The shaft is 4mm diameter and the nut is M3.
To remove the gearbox, first remove the shock absorbers from the brackets.
Remove the motor cover and then remove the motor. The gearbox is held by 4 screws on its bracket.
The 280 motor has an 8 tooth 0.6M pinion. Its specification is 17000 rpm (not load) at 7.2V (0.32A) or 22,600 rpm at 9.6V; It matches the RC-280SA-2865 motor specifications. To access the inside of the gearbox, 3 screws are removed:
The gearbox has two speeds:
slow speed: 1: 16.3 ratio (40/8 * 49/15).
fast speed: 1: 10.2 ratio (40/8 * 43/21)..
The speed with the 67mm diameter wheels would be around 21 or 22 Km/h.
This car has front independent suspension with friction dampers (spring only)
without any additional anti-rebound system. The rigid rear suspension was inherited
from another Tamiya buggies (Hornet, Grasshopper).
Spare tires are hard to find; If we want to change the rear wheel for a standard 12 mm
hexagon wheel, we can do it with a 4mm hexagonal adapter (with grub screws):
Wheel axle detail.
The Super Sabre in action (Badiola RC photographer):
These thread is in spanish lang. in
https://reparar-cochesrc.blogspot.com/2015/12/reparar-antena-de-emisora-tamiya-qd.html
