Kwon Posted July 30, 2013 Posted July 30, 2013 Hello! I just builded my fastest MOC, Rc buggy 12km/h! The speed secret is, I have used two Power functions Train motor for propulsion, and I got that fast speed! :) All of the parts are not limited, which means you can build yours! :) Thank you! Quote
skriblez Posted July 30, 2013 Posted July 30, 2013 Cool. Didn't know one could use train motors like that. Quote
Doc_Brown Posted July 30, 2013 Posted July 30, 2013 I also didn't know train motors could do that! thanks for sharing. :D Quote
Philo Posted July 30, 2013 Posted July 30, 2013 Yes, they are pretty powerful and quite fast... but their torque is low. Nice agile vehicle! Quote
sunnykoomos Posted July 30, 2013 Posted July 30, 2013 (edited) Didn't know one could use train motors like that. I also didn't know train motors could do that! I am sad that I don't have a EB account in 2012 Yes, they are pretty powerful and quite fast... but their torque is low. True! Kwon choose to use 2 motors and I choose to geardown. Edited July 30, 2013 by sunnykoomos Quote
timslegos Posted July 30, 2013 Posted July 30, 2013 I never would have thought of using a train motor for propulsion, nice job. tim Quote
Someonenamedjon Posted July 30, 2013 Posted July 30, 2013 Could you show us a close up and the setup of it? Quote
Kwon Posted July 31, 2013 Author Posted July 31, 2013 (edited) good job )) Thank you! eheh that works nicely :) Eheh thank you =P Cool. Didn't know one could use train motors like that. Yes I didn't know it either =P I also didn't know train motors could do that! thanks for sharing. :D You're welcome! I just loved with your ford through :P Yes, they are pretty powerful and quite fast... but their torque is low. Nice agile vehicle! Thank you so much! It just helped me to buy train motors ;). I am sad that I don't have a EB account in 2012 True! Kwon choose to use 2 motors and I choose to geardown. Hey sunny! :) :) :) Thank you! I just thought that vehicle will be success after see your train motor vehicles I never would have thought of using a train motor for propulsion, nice job. tim Wow, thank you! Could you show us a close up and the setup of it? Not a such complex setup, just wheels connected to motor directly, which don't use diff gear. It turned well :) Sorry for not made detailed pic, it was beta version through, i am just adding suspension, return to center steering etc.... But thank you for asking, hope it can make a sense ;) Edited July 31, 2013 by Kwon Quote
Kwon Posted July 31, 2013 Author Posted July 31, 2013 math for caculate speed. Pf train motor - 1900 RPM Wheel circumference - 57*3.14 = 178.98mm, 17.898cm Rotation*circumference = speed 1900*17.898= 34006.2cm per minute = 20.40372km per hour. Speed about 20km/h if i don't caculate wind etc.... Please find error or give suggestion, i am not sure this math is perfect, (i am not so good at that) Thanks! Quote
Philo Posted July 31, 2013 Posted July 31, 2013 Mathematically exact... now the problem is indeed friction, with the air (should be low at this speed) and with axle bearings, between tires and ground, etc... So actual figure can be significantly lower. You just have to measure it, using a NXT ( - or EV3!) and some sensors placed wide apart ;) Quote
Kwon Posted July 31, 2013 Author Posted July 31, 2013 Mathematically exact... now the problem is indeed friction, with the air (should be low at this speed) and with axle bearings, between tires and ground, etc... So actual figure can be significantly lower. You just have to measure it, using a NXT ( - or EV3!) and some sensors placed wide apart ;) Yes, So it is 12km/h :) Quote
Doc_Brown Posted July 31, 2013 Posted July 31, 2013 Are these the motors you used? I know there are a few different train motors. :) http://shop.lego.com/en-US/LEGO-Power-Functions-Train-Motor-88002 Quote
zux Posted July 31, 2013 Posted July 31, 2013 Are these the motors you used? I know there are a few different train motors. :) http://shop.lego.com...ain-Motor-88002 This is the only PF Train motor available. Quote
Kwon Posted August 1, 2013 Author Posted August 1, 2013 Are these the motors you used? I know there are a few different train motors. :) http://shop.lego.com...ain-Motor-88002 Yes, Number 88002, power functions train motor, with Red/Orange holes :) Quote
lilongwe Posted August 8, 2013 Posted August 8, 2013 (edited) That is really fast. Nice idea to use a train motor for a car. Edited August 8, 2013 by lilongwe Quote
Kwon Posted August 19, 2013 Author Posted August 19, 2013 That is really fast. Nice idea to use a train motor for a car. thank you! Quote
Junpei Posted August 19, 2013 Posted August 19, 2013 You might want to check the date on that comment... Good job though, interesting use of train motors! Quote
Kwon Posted August 19, 2013 Author Posted August 19, 2013 You might want to check the date on that comment... Good job though, interesting use of train motors! Thank you! but I didn't get first sentence, What did you mean for 'You might want to check the date on that comment....' ? Quote
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