Updates
Short posts and information that are worth sharing but don’t quite fit a full article.
What happens when a Boxstock Mini 4WD going over a Tamiya Japan Cup Junior Circuit Slope Jump?
What happens when you have a Boxstock Mini 4WD going over a Tamiya Japan Cup Junior Circuit Slope Jump section at full speed (~4.3m/s) with no brakes?
Here is what our jump simulator shows at 0.1X (slow motion). We can also see the bounce effect of the car when landing.
What do you think? Do you agree with the result?
Legend:
a: angle
vx: horizontal velocity m/s
vy: vertical velocity m/s
s: speed m/s
m: surface gradient
Which roller is the fastest?
Based on your feedback, we have improved the comparison chart by adding some photos of the rollers. We hope this makes it easier to read. Roller with the least friction is the fastest but certainly there are other important factors to consider too. Read the full report find out more.
We used science to test 15 sets of Mini 4WD rollers:
Kit Standard Roller (13mm/blue) [Item no: 95304]
Kit Standard Roller (14mm/yellow) [Item no: 95130]
Low Friction Roller Set Light Green (16mm) [Item no: 95391]
Low Friction Roller Set Blue (19mm) [Item no: 95391]
13mm Aluminum Ball-race Roller (Ringless/Green) [Item no: 95612]
HG 17mm Aluminum Ball-race Roller (Ringless) [Item no: 15522]
40th Anniversary HG 19mm Aluminum Ball-race Roller (ringless) [Item no: 95643]
HG 13mm Tapered Aluminum Ball-Race Roller (Ringless) [Item no: 95497]
19mm Aluminum Rollers w/Plastic Ring (Dish Type) [Item no: 15426]
19mm Aluminum Ball-race Roller Set J-CUP 2023 (blue) [Item no: 95160]
Lightweight Double Aluminum Roller (9-8mm/Red) [Item no: 95562]
Lightweight Double Aluminum Roller (13-12mm/Green) [Item no: 95606]
9mm Ball Bearing [Item no: 15344]
11mm Ball Bearing [Item no: 15345]
13mm Ball Bearing [Item no: 15475]
Motor magnets strength measured
Recently saw a post in a Mini 4WD group TAMIYA田宮四驅車情報站 on FB about measuring magnet strength using the “Compass” App. I am not sure how this can be done with the compass app but we did use a Magnetometer App to do some measurements before. We tested 9 motors: Stock double shaft (PRO), Rev Tuned 2 PRO, Torque Tuned 2 PRO, Atomic Tuned 2 PRO, Light Dash PRO, Hyper Dash PRO, Mach Dash PRO, Power Dash and Ultra Dash. We placed the motor around the phone sensor until we got a maximum value. The unit for magnetic strength is Tesla (T). We were measuring in micro Tesla (µT). We normalised the result with the background magnetic noise. Please note, we haven’t calibrated the app nor checked the accuracy. So the result might be off, but it should give a good indication. Here is what we found:
– Power Dash and Hyper Dash PRO have the strongest magnets, but only just.
– Torque Tuned, Atomic Tuned, Light Dash and Mach Dash all seems to use similar magnets.
– Rev Tuned magnets are only a little bit stronger than Stock
– The “high rev” motors e.g. Rev Tuned and Ultra Dash seem to use weaker magnets. So does it mean (high torque – strong magnet, high rev – weak magnet)?
What do you think? What do you take away from these results? Please share your comments below.
Magnetometer App