ejayb Posted July 17, 2021 Posted July 17, 2021 Can anyone point me to some examples of short locomotives powered by the large technic motor 88013? I'm imagining it standing up in the cable driving the rear axle and using roads to transfer power to the front. Quote
JopieK Posted July 18, 2021 Posted July 18, 2021 Well LEGO suggests to use 88013 for powering the crocodile (10277). See: https://rebrickable.com/instructions/10277-1/ p118+ Quote
ejayb Posted July 18, 2021 Author Posted July 18, 2021 On 7/18/2021 at 7:44 AM, JopieK said: Well LEGO suggests to use 88013 for powering the crocodile (10277). See: https://rebrickable.com/instructions/10277-1/ p118+ Expand The crocodiles body is about 20 studs long, a mod based on that might be the easiest and cheapest option. Quote
Hod Carrier Posted July 18, 2021 Posted July 18, 2021 You may already be aware of this, although I wasn’t until I’d got hold of some 88013 motors. It’s 8 studs long compared to the old PF L-motor which is 7 studs long. Standing one upright is going to make any model quite tall, especially once you’ve added any gearing to drive the axle. Quote
Lok24 Posted July 18, 2021 Posted July 18, 2021 On 7/18/2021 at 8:33 AM, ejayb said: The crocodiles body is about 20 studs long, a mod based on that might be the easiest and cheapest option. Expand But that's the opposite of a "short" locomotive ? For a loco only 16 studs long I used the 88008 or the 45303 verticaly in the cabin. Find more infos her: https://www.1000steine.de/de/gemeinschaft/forum/?entry=1&id=452684#id452684 Quote
ejayb Posted July 18, 2021 Author Posted July 18, 2021 On 7/18/2021 at 11:04 AM, Lok24 said: But that's the opposite of a "short" locomotive ? Expand 20 is slightly longer than I'd like, but it's not 30 or 40. I also don't have the skills to design a decent model myself. Your example is very nice, but I want to use the 88013 motor for the speed (not power) function. Quote
Lok24 Posted July 18, 2021 Posted July 18, 2021 On 7/18/2021 at 11:07 AM, ejayb said: Your example is very nice, but I want to use the 88013 motor for the speed (not power) function. Expand That's why I mentioned the 88008... Quote
ejayb Posted July 18, 2021 Author Posted July 18, 2021 I apologise Lok, I thought only the Technic L and XL motors did speed control. I understand that you have the battery box mounted to two long Technic bricks. How is the motor attached? And what gearing did you use? Quote
Lok24 Posted July 18, 2021 Posted July 18, 2021 (edited) On 7/18/2021 at 11:46 AM, ejayb said: I apologise Lok, I thought only the Technic L and XL motors did speed control. Expand As I understood all seven motors support speed - only Train motor and wedo 45303 do not, as they have no sensor. On 7/18/2021 at 11:46 AM, ejayb said: I understand that you have the battery box mounted to two long Technic bricks. How is the motor attached? And what gearing did you use? Expand All infos in the link mentioned above: https://www.1000steine.de/de/gemeinschaft/forum/?entry=1&id=452684#id452684 Edited July 18, 2021 by Lok24 Quote
ejayb Posted July 19, 2021 Author Posted July 19, 2021 Following in, has anyone used the 88008 motor? Quote
Ts__ Posted July 19, 2021 Posted July 19, 2021 (edited) Yes, I have installed 2x the Lego Boost Interactive motor in a shunting locomotive and use the speed feedback to control the constant speed, no matter how many cars are to be pushed/pulled. The locomotive is of course bigger than what you have in mind. But there are also 2 engines inside. Really small locomotives are difficult with such a setup: HUB 8 studs long, motor with gear 9 studs long. Thomas Edited July 19, 2021 by Ts__ Quote
ejayb Posted July 19, 2021 Author Posted July 19, 2021 What kind of wagons are you moving? Was two motors necessary? Quote
Ts__ Posted July 19, 2021 Posted July 19, 2021 I want to push many (e.g. 10) freight wagons up a hill, hence the 2 motors. I have never tried out whether it would also work with one. If more wagons work, it would also be nice. I think I have tried it so far with 9 mixed wagons from 330 grams to almost 1 kg. All my locomotives so far have at least 2 motors, so the question of whether it would also work with one did not arise. At the moment, i have only a pic with two wagons. The grey one weighs about 510 grams. The tanker is much lighter. Thomas Quote
ejayb Posted July 19, 2021 Author Posted July 19, 2021 Thanks Thomas I'll be moving less, lighter wagons over level tracks so hopefully 1 will be enough. What gear ratio did you end up with? What range 'speed' are you usually running in the app? I'm hoping that running the motor closer to full speed reduces the whine from the controller. Do you have a thread on the build? Quote
Vilhelm22 Posted July 19, 2021 Posted July 19, 2021 This is actually quite a beneficial topic for me too. I'm planning on at some point building the DB E69 02, a beautiful little locomotive. I'm assuming you need at least an L motor to power one of these trains - an M won't be enough I'm guessing. Quote
zephyr1934 Posted July 20, 2021 Posted July 20, 2021 On 7/19/2021 at 8:36 PM, ejayb said: I'll be moving less, lighter wagons over level tracks so hopefully 1 will be enough. Expand If you are moving lighter wagons on level track with a tiny locomotive you might want to try the train motor first. You won't have the speed control, but you might not need it. You could quickly throw together a motor+controller+coupler to test the pulling power and speed to see if it meets what you need. Even if the simple train motor works, it sounds like you want the greater functionality anyway. I'm just tossing it out there because you will have a hard time building smaller than what you can do with a train motor as the base. Anyway, it is an interesting conversation and the insights are helpful. Quote
ejayb Posted July 20, 2021 Author Posted July 20, 2021 On 7/20/2021 at 2:11 PM, zephyr1934 said: Even if the simple train motor works, it sounds like you want the greater functionality anyway. Expand I do have a train motor loco, I should have mentioned. Using a custom controller in the powered up app PoweredUp, I find that will begin moving on straights at power level 18 (out of 50 I believe?) but will shall on the switches. 21 will get it around the switches but then it's already running too fast. Quote
Ts__ Posted July 20, 2021 Posted July 20, 2021 On 7/19/2021 at 8:36 PM, ejayb said: I'll be moving less, lighter wagons over level tracks so hopefully 1 will be enough. Expand Yes, is worth a test On 7/19/2021 at 8:36 PM, ejayb said: What gear ratio did you end up with? Expand Gear ratio is 1.6667: 1, but I use BigBenWheels M-wheels in the locomotive. So larger than the small train wheels. And faster. The locomotive is a shunting locomotive and is designed for power, not speed. For a mainline locomotive, you would have to use 1:1 or more with this motor in any case. On 7/19/2021 at 8:36 PM, ejayb said: What range 'speed' are you usually running in the app? Expand My goal was to drive as consistently slow as possible. The locomotive runs with wagons at about 20 revolutions (per minute?). Maximum speed is about 110 revolutions. Values from the APP. The maximum speed of the locomotive is not very high. On 7/19/2021 at 8:36 PM, ejayb said: Do you have a thread on the build? Expand Currently, I have shown nothing more of the locomotive here on Eurobricks than the pictures in the thread here. I plan to create videos in August. On 7/19/2021 at 8:49 PM, Vilhelm22 said: I'm assuming you need at least an L motor to power one of these trains - an M won't be enough I'm guessing. Expand An L motor is 2 studs longer, but much faster and more powerful. For the V90, I decided against an L-motor for the following reasons: - I wanted to drive all 4 axles, which is difficult with one motor. For climpl hills with max traction. - 2 L-motors overstrain the small Lego City PU-Hub -> draw too much current -> overload flashes constantly, batteries immediately empty For a smaller locomotive surely also an L-engine is enough. On 7/20/2021 at 2:11 PM, zephyr1934 said: tiny locomotive you might want to try the train motor first. Expand The train engine is a good engine for mainline locomotives. However, it is not good at slow speed and it is difficult to use under/over gear ratios. On 7/20/2021 at 2:53 PM, ejayb said: 21 will get it around the switches but then it's already running too fast. Expand Yes, the train motor is a fast motor and can´t drive good slowly. Thomas Quote
ejayb Posted July 21, 2021 Author Posted July 21, 2021 Thanks for the reply Ts. One more question, does it have the same annoying whine as the train motor? Quote
Ts__ Posted July 24, 2021 Posted July 24, 2021 Sounds are difficult to describe comparatively. However, the boost motor is not quiet. It has a different sound than the train motor, but not a nice one either. Currently I have no video of the locomotive with this engine, that will take time. Thomas Quote
M_slug357 Posted July 29, 2021 Posted July 29, 2021 @ejayb Back in the good ol' days of Power Functions, I tried to tackle a similar idea using the L-motor. While it wasn't the best solution, I feel it came very close though! Quote
XG BC Posted August 1, 2021 Posted August 1, 2021 why not just load up studio and try to make the smallest loco possible with this motor you will be surprised how small you can go! Quote
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