KO Grand Prix in TamTam GIFU

Masami Hirosaka BD-9 Setting Memo

Shock shaft
New product with heavy fluorine coating HVF shock shaft Model No.: B9-S5SHVF) is used. It runs smoothly and is excellent in durability, and finished 3 days of running with no maintenance.

Shock piston
We use 6 holes of 1.1mm (hole size) of new product (Product No.: B9-S116).
It has a driving characteristic that sticks to the road surface.

Weight saving
Aluminum gear cup (Product No.: B9-501GA), aluminum universal gear (Product No.: B9-010AA) and Titanium Suspension Arm Pin (Product No.: Front B9-009AFT / Rear B9-009 ART) were used to lighten the drive system and the foot. Also, the drive system was lightened using a belt type belt (Model No.: BD-513LB & BD-189LB).

Cam for adjusting belt tension
Use high-precision resin machine cut type (Product No.: B9-BTCB).

Weight
10g each mounted on the left and right of the front part, to keep the front part floating.

Lower center of gravity
The routing of wiring was lowered and the center of gravity was lowered.

Front suspension block
It was split to give a mild steering feel.

Tyres
Use all round SOREX 28R.
Use tire warmers only if the road temperature is below 15 degrees.
Even if the road surface temperature was 40 degrees, the heat dripping was small.

Rims
Yokomo Super Precision (Product No..: TW-1012-2) → Axon DYNAMIC → Yokomo
As it will turn in order of aero dish (Product No.: TW-2512-2), according to the situation
I made a choice. In the end, choose DYNAMIC, which is an intermediate property.

Pivot ball
The inside of the front I arm uses the chief type.
The inside of the rear I arm uses a short neck type.

RTC (rear toe control)
The RTC was used to set up the dexterity. Further increase the rigidity of the RTC
I processed the front hub carrier and attached it. At that time, for the right (FR4) attach the left side (FL4) to the right side and the left and right sides on the left side

Servo
The KO Flection, a coreless motor specification with mild characteristics, and the KO Grasser with a brushless motor specification, with aggressive characteristics, are compared, and the front tire has escaped a little and the Flection with a heavy load on the rear tires is selected.
If the setting of the machine is decided further, finally
The impression was that Grasper could run faster.

The above is the memo content of the race on Sunday, April 28, 2019.