LPEtools
LPEtools is a simply web software which enables you to know more about your Lego Pneumatic Engine
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Choose the characteristics
Standard cylinder
Small cylinder
Old cylinder
Number of cylinder
Pressure
bar (1 bar = 14,51 psi)
Radius (r) of the crankshaft
mm
Dimension (d) of the rod
mm
Speed
rpm
Number of switch
Switchs reduce the efficiency
Have you modified the switchs ?
No
Yes
Power and Torque
Theorical Max Power
W
Theorical Average Torque :
N.cm
Some Lego motors equivalent
Torque (N.cm)
Speed (rpm)
Mechanical Power (W)
XL
40
220
3.3
M
11
405
1.53
NXT
50
170
3.1
71427 & 43362
6
350
0.8
RC
12
1300
2.38
Nota concerning the data : the switchs have an internal deadpoint of 2mm on 20mm of stroke, then the theorical efficiency is 0.90. An experiment has shown that the non-modified switchs have and efficiency of 0.50 to compare with the modified. Copyright © 2011 Nico71