T3...如用5.5t無擦摩打, 84t spur gear...應該用幾多t的"摩打齒"?

請問咁多位師兄,

T3...如用5.5t無擦摩打, 84t spur gear(48pitch)...應該用幾多t的48pitch"摩打齒"?
thanks!

1# hkdavidlam

t3-48p約17至19

2# rrsss

唔該晒師兄~~~

Hold on David C hing, this ratio seems to be too safe, the car will be slow and motor over rev

84 / 17 * 1.9 = 9.38 (FDR)
84 / 19 * 1.9 = 8.4

For your reference, my T2 or T3 with 4.5R, running at FDR 8.1, motor is not too hot.
Changed to FDR 7.75, motor start to be little hotter at TRC, still have room to over.
So 5.5R, i suggest u start to try from FDR 7.5, that is around 21 摩打齒

U have to try yourself with reference to - motor temp, running time, pick up speed and top speed until it is happy for u

interesing point to share with u:
"The power capability for the ESC and motors during our development tended to be well beyond what most users would ever dream up for realistically driveable gearing options. The only real upper limit to gearing is the temperature of the motor. As long as the motor is less than 200 degrees F (would burn your finger almost instantly) at the end of the run, you’re OK.
"

from http://www.castlecreations.com/support/max_tuning_guide.html

200 degrees F = 93 degree C, this may be too high for normal player
i usually keep it below 60 degree C

Gearing is only one component that affects esc / motor temperature.  other factors include:

* amount of drag brake
* circuit technicality
* size of circuit
* outside temperature
* driving style
* car setup (binding, 4wd vs 2wd, belt vs shaft)

so temp your motor after a few laps.  anything below 70C should be safe.

5# hk_sdu

好詳細的資料~~~學到野...thanks!

6# hardmankam

唔該晒~~~你係唔係用紅外線溫度計~~~來同motor測溫??
thanks!

6# hardmankam

yeah, right, that's why when we run the same car, same setting, same day, same 8 mins run, everything same, on EP and GP track (TRC), surprisingly, on GP track the motor temp is much lower. May be because of large and wide track, less break used. Higher speed, more airflow to cool down, and more full throttle. But softer driving skill when the track layout is new to me.

9# hk_sdu

Very informative,
Thanks for yours suggestion!