dkshema
rrProfessor
Location: Cedar Rapids, IA
| I looked at the 450V manual on line to verify that the 450V uses the SAME gears as the EP400/400XP. It does. CA2022 and CA2020.
According to my tooth counts a few years back, with a 37 tooth pinion, you'll have a reduction ratio of 9.51:1.
If you drop a tooth down to 36, you'll end up with 9.77:1
and if you go with a 35 tooth pinion, you'll end up with 10.05:1.
A 32 tooth will get you 10.99:1
A good source of pinions is Robinson Racing 64 Pitch pinions. A large selection of pinions having an 1/8th inch bore. The RC Car guys use them.
Tower Hobbies has 'em.
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From my EP 400 Build Thread over in the New and Emerging Electrics page:
15T = 23.4:1
16T = 21.98:1
17T = 20.69:1
18T = 19.54:1
19T = 18.51:1
20T = 17.58:1
21T = 16.75:1
22T = 15.98:1
23T = 15.29:1
24T = 14.65:1
25T = 14.07:1
26T = 13.53:1
27T = 13.03:1
28T = 12.56:1
29T = 12.13:1
30T = 11.73:1
31T = 11.35:1
32T = 10.99:1
33T = 10.66:1
34T = 10.35:1
35T = 10.05:1
36T = 9.77:1
37T = 9.51:1
Here is where the numbers come from:
The motor pinion meshes with a 67 tooth gear. This, in turn, drives a 20-tooth pinion that meshes with the main rotor drive gear which has 105 teeth. The 105 tooth/20T combination is a 5.25:1 ratio.
To compute the overall reduction from the motor to the main rotor:
Divide 67 by the number of teeth on your pinion. Multiply that result by 5.25 to get the total reduction ratio number.
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* Making the World a Better Place -- One Helicopter at a time! *
Dave |
