RC car gearing calculator
Entities
Parameters
Instructions and details
Use at your own risk :-) The calculated values are not saved anywhere.
Version : 0.95
Date : 2021-03-30
Gear ratio
Select pinion tooth count
5
6
7
8
9
10
11
12
13
14
15
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51
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53
54
55
56
57
58
59
60
Select spur gear tooth count
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
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61
62
63
64
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91
92
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111
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129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
Calculated gear ratio:
: 1
The number reflects how many revolutions does the pinion gear make to turn the spur gear one revolution.
Transmission ratio
Transmission ratio unknown, calculate as 1 : 1
You can set the transmission ratio to 1:1 value, calculate the ratio based on transmission gear sizes or manually enter the ratio if it is already known. It is presumed that the transmission consists of 3 gears. The middle/idle gear doesn't have to be taken into account in calculations.
Calculate transmission ratio
Manually enter transmission ratio
: 1
Top/input gear tooth count
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
Bottom/diff gear tooth count
>
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
Calculated transmission ratio:
1
: 1
Total drive reduction ratio:
1
: 1
The amount of revolutions that the pinion gear must turn in order to turn the wheels one revolution.
RPM to transmission
Motor kilovolts amount
kv
Enter the kilovolts amount of the motor. The kilovolts amount indicates how many revolutions the motor will make in one minute per volts applied
LiPo Battery voltage
Manually enter battery voltage
Enter voltage value
Select a pre-defined battery voltage
Battery voltage when fully charged. A nominal voltage for LiPo batteries is 3.7 v per cell.
2S / 8.4 v
3S / 12.6 v
4S / 16.8 v
5S / 21.0 v
6S / 25.2 v
Motor RPM value:
RPM
The motor spins this many rounds per minute.
RPM to transmission value:
RPM
The amount of revolutions that the motor and pinion and spur gear combination will cause the transmission to turn in one minute. This is the RPM value entering the transmission through spur gear, not taking transmission ratio into account.
RPM to wheels value:
RPM
The amount of revolutions that the this gearing combination will cause the driving wheels to turn in one minute.
Rollout and theoretical top speed
Tire diameter
Tire diameter in millimeters
Tire diameter in inches
Rollout values
millimeters- roll out value for metric units
inches- roll out value for U.S. units
Theoretical top speed
km/h
The top speed calculation is only a theoretical number with no assumptions about friction and other parameters that make the real-world top speeds significately slower.
The RC car goes
meters in second
mph
Version 0.90 (C) 2021
Pii-Atomi Tmi