Jordan Valley RC Circuit - Part 1

The new Jordan Valley Radio Control Circult is located on Kolwoon Jordan Valley Playground Phase 2 where was reservoir and government landfill and being idle before. Few years ago, government approved to build a RC circuit there in order to promote leisure and culture activities and it was planned to open for public this year. Prior to the opening of it, 3Racing was invited by Hong Kong Racing Model Club to try and test the circult, finding if there any defects and shortcoming. SAKURA ZERO is honoured to be the first car racing on the new track.

The circult can be divided in several parts:

1. Outdoor Circuit: it regarded Macua circult as construction reference and is approximately 120m X 60m in area. The track is wide and flat, using low level corners which won't make severe damge to cars even crashing.

2. Indoor Circuit: it is smaller in area that is about 20m X 20m. It offers a good place for freshmen to practise before competition, also it acts as a small racetrack as well.

3. Indoor Pit: it is spacious and neat. There are 8 large tables and 4 medium size tables, which could accommodate maximum 40 people at the same time and each of the driver is offered 2 electric power supplies. With the adequate lighting in the pit, racing at night is no more a problem.

4. Auditorium and Driver Stand: it used velarium design with glass surroundings which allows sunshine in, making the stage more open and bright. Also, the distance between it and the track is about 4 meters, which provides better eyesight for drivers who always keep moving their heads when driving cars in other small circults in Hong Kong.

5. Other supplementary facilities: the circult was also equipped with other facilities like drinking machines, toilets and carpark, also with jogging pathway and children playground nearby.

Jordan Valley Radio Control Circult, is surrounded by mountains which provides natural ventilation and creates a cool environment for drivers, it definitely attracts RC fanatics crowd into it right after official opening.

The Revolution Process of Sakura Zero

The emergence of M05 led me to pick up my passion towards RC car, I start to drive car again . One day, I met my old friends in TC Radio Control Car Track, we chatted and discussed a lot about global tendency of the chassis development, new models published and the competitions held recently, the re-union evoked my great enthusiasm, I thought that it is not enough to be trendy, but lead the trend myself.


Mr. Tireman, who is my friend already for 20 years, he told me that he wanted to rebuild his 1/10 Touring Car, I originally wanted to upgrade the performance of the chassis body for him only, but after I worked on it for few weeks, I was surprised that the half of the chassis has been rebuilt. Then we talked about the TITC competition in Thailand, a thought suddenly appeared in my mind that I can innovate an original 1/10 Touring Car and combine it with Team Powers gear to participate in TITC competition.


Then we started to get involved in the development of the chassis structure, we focused on mixing the advantages and improving the defects of the present available cars in the market.


The appearance of LI-PO battery was definitely a turning point to the Radio Control Car Market. SUB C battery will be substituted and the new chassis has to suit and fit with LI-PO battery, the weight proportion issue therefore is the main point of the design project.


Because of the performance of Brushless motor, the durability of the differential was a key problem needed to improve. In order to upgrade the powerful motive force, the differential balls are increased from 6 to 8, from 8 to 10, and now 12, the increase in number of it is to maximize the contact points, so as to make the car move smoothly and steadily, the chance of spinning is also be lessened.


For the purpose of attaining traction control to increase the number of differential balls, it is inevitable to widen the diameter of differential pulley. However, the enlarged diameter will be against with low CG requirement. Regarding to this problem, we consulted different experts and asked for their opinions. One of them, Mr. Racing Wu gave me a wonderful idea that using differential rolls to replace traditional differential balls. Since the structure of the regular differential is basically the same with the thrust bearing and there is roll system in thrust bearing which also need to bear the gravity, we decided to test the rolls trying to apply it in differential.

This is the roll differential that we bought from the market

The elementary testing result was acceptable, but it needed certain time and money devoted to produce a real and applicable differential pulley to undergo a real test. I prefer to produce sample to test it, which made Mr. Racing Wu shocked and said I was crazy to do something that may just waste money. However, I insisted to do this so-called risky investment as I believe people never success without trial and error.

Sakura Zero Option Part- 7075 rear rolling differential system (RDSTM) 

The caructure and the differential part was almost completed after over several weeks continuously design revision and production, the next step was to test the car. Our colleague, Miss Ethel suggested to use deep pink which is shine and attractive to be the theme color of the car, this color wasn't ever used in the market. It is unique as people either like it or hate it, which may in turn create noise and bring wide discussion by RC fans.

We expected to sell it in Japan starting from April which is also the Sakura blooming season in Japan, so we determined to use “Sakura” as the name of our first touring car.