alfredboyer

Eurobricks Vassals
  • Content Count

    16
  • Joined

  • Last visited

About alfredboyer

Spam Prevention

  • What is favorite LEGO theme? (we need this info to prevent spam)
    Technic
  • Which LEGO set did you recently purchase or build?
    9396

Profile Information

  • Gender
    Male
  • Interests
    Legos, Astronomy, Piano, Engineering

Extra

  • Country
    France

Recent Profile Visitors

The recent visitors block is disabled and is not being shown to other users.

  1. alfredboyer

    [MOC] Lego Pneumatic Steam Locomotive

    Definitely a good idea but, I don't think it's enough tho, the fly wheels makes a pretty good job. But it could worth a try, like if Lego makes rubber band big enough for covering the big wheels tho 😅
  2. alfredboyer

    [MOC] Lego Pneumatic Steam Locomotive

    Hello, for instance no it cannot drive in corners because I didn't manage to make some railtracks with curves. I am pretty sure it could with some work, but due to the size of the locomotive, the curves would probably have a radius of minimum 2m I would say, which isn't really suitable for most houses. But that wasn't the point, the point was to make something that you can look at, something that you can make go foward and brake. The goal is to show how a steam locomotive works and have fun mostly like that. Yeah that's really how I designed it : I wanted to make a cool steam locomotive that works pretty much like a real one (air pistons, air brakes, air whistle...) and put the "playability" (meaning here, playing on railtracks) aside. I knew that by choosing to do that, I had to abandon the Lego train tracks, because we need to scale up. Lego Trains are too small to work with compressed air and all. So to answer I'll show how it's made, using the 3D model I made of the Locomotive : (the 3D might have some differences with the actual locomotive, it's not the final version here) If we zoom, facing the wheels and railtracks, we can see that I designed the tracks so they fit like this : In fact the wheels I chose aren't perfectly flat, so they kinda work like flanged wheels so the train stay in the middle of the tracks. For the wheels of the tender, I can use flanged lego train wheels in black, because they also fit the rail tracks. So the tender is kept in place. For having all the wheels touching the floor when not on railtracks, the tender can move up and down a little, just enough for compensating when it is not on the tracks. (not visible in the video) I don't know if I made myself clear but to sum up : - The driving wheels aren't perfectly flat, which allow me to make railtracks really guiding the locomotive. - The tender had flanged wheels too, and can move up and down to compensate the difference of height when the train isn't on the tracks. Is it a little understandable ? ^^"
  3. alfredboyer

    [MOC] Lego Pneumatic Steam Locomotive

    Thanks a lot ! Happy that I can give u interest in that ! The whistle is also thanks to some luck, I tried to blow on manyyyy different lego parts to see if they will ring ^^
  4. alfredboyer

    [MOC] Pneumatic Steam Locomotive - scale 1:25

    Yeah of course of steam, no lego can survive. The compressor will make some noise for sure, and it may even hide the "tch tch" we can hear from the pistons and switches. But I want to keep this project with only Lego parts for instance, even if, yeah, a 2L would totally give enough air for a while. The other solution is to put something like... 25 Lego air tanks, but then it will start to be hell of expensive
  5. alfredboyer

    [MOC] Lego Pneumatic Steam Locomotive

    I wish it goes to the Hall of Fame qualification, that's awesome ! I corrected the link, thanks for telling me. Lego Ideas is here.
  6. alfredboyer

    [MOC] Pneumatic Steam Locomotive - scale 1:25

    Thank you everybody for being so supportive ! I am happy you like the design :) I've been told that it's not the best to post my MOC presentation in two different eurobrick's forum. So if you want more explainations etc please go to the Technic section ! : Click here to go to the main topic page On 2.5 bars it should go for about 2-3 meters far on full air tanks, depending on which speed you choose. It's not much so that's why people suggested to add a little lego compressor in the tender with a battery box. I think that's a nice solution to make it go as far as possible :) For a real steam boiler...I am staying on a only lego parts design for now, but damn it would be awesome to see this machine with steam all around !
  7. alfredboyer

    [MOC] Lego Pneumatic Steam Locomotive

    haha yes But I will explain more with 3D models, here : The Free Wheel : Connected by gears, the free wheel turns 25 times faster than the wheels. It is also connected (by 8t/24t) to a "HOG", so in case of the locomotive doesn't start or need a little help, you can start the pneumatic engine. The brakes : I hope it's clear like that, but the system for the brakes is quite simple, it was just hard to integrate around the wheels since it's quite crowded over there. The whistle : When I looked for making a whistle, I tried to see first how it works (physically speaking). Briefly, you need to create a pressure disturbance on the top of a cavity. Then, a "shock" wave in the cavity is created, and start to resonate. So I looked for some Lego parts having these caracteristics : a cavity with one small air entrance. What I found is this, from bionicle Legos : We can see a small hole on the top of the ball, and the inside of the ball is empty. Now the problem was that for it to ring, you need to blow air on the hole with a very specific angle. Because I wanted to make this easy to build for everybody (Important for Lego Ideas too), it should be possible to set the whistle very easily. The solution was to put the ball in a differential : It's great to use a differential because : - The ball is having almost exactly the same size than the inside of the differential, just a little tiny bigger so the ball stay in place in it. - The differential is having a little axle in the middle to normally support the 12t gear. Here it is used as something to block the orientation of the ball. In fact, the opposite side of the lego ball is having a hollow, so this axle will nicely lock the ball. Then, you just have to fix the air inflow above the differential, connect the differential to an 8t gear or a worm gear, and you can find the perfect angle easily for the whistle to ring ! It is also possible to put 2 balls in 2 differentials with 2 air supplies, so then you get a nice noise since it looks like the whistle is having a little echo (but it uses more air). And really, thank you everybody for your comments !
  8. alfredboyer

    Hello Eurobricks

    Thank you :) I already like that place
  9. alfredboyer

    [MOC] Lego Pneumatic Steam Locomotive

    Haha I agree, I didn't know where to put it too. If it happens it would be awesome since the latest Lego switch seems to be even less suitable for pneumatic engines... In that case, better than removing the fly wheel is to make it smaller, I think it would be still great to smothen the whole movement. Thanks for your awesome comments and for the front paging ! it's well appreciated Thanks ! I am not sure to understand well your question, are you asking how are the pneumatic connected, like the whole connecting plan ? I could make a map of that yeah, here I did it with no plan, except that the left valve controls the right external piston and the right valve controls the left external piston.
  10. alfredboyer

    [MOC] Pneumatic Steam Locomotive - scale 1:25

    wow that's a dangerous Idea ! Not for the kids, but for my Legos haha. Seriously I think I can pull a mouse or a guinea pig, maybe a kitten but no more. Internally it works like a classic Lego Pneumatic Engine, like this : (gif by Nico71) A serie of four 36t gears connects the piston and wheels together, and transmit the power to the free wheel (after a couple of 40t/8t). Only the 4 front wheels are linked by gears, the 4 others are free. I can give you some more views if you like, I have some 3D models made for the loco. Thank you guys for the comments, it's well apreciated :)
  11. alfredboyer

    [MOC] 4-8-2 Mountain Type

    Beautiful ! you'll build it with real parts ? Maybe you could try to hide the sharp line between the red roof and the black boiler ? I think that using a flexible axle/tube put ahead of the cabin could make the general look more curly.
  12. Hello Lego train fans, (I repost here the work I have done on a pneumatic locomotive. I really don't know where to post since my MOC belongs to Technic category and Train category. So I post it here too. Of course here maybe we can talk more about the design and reproduction of the details of the locomotive. If this other post is too much, I am sorry that I posted in two places (and moderators could remove it), but I think it's understandable why I did this. Anyways !) I am glad to introduce you my last big project : a pneumatic steam locomotive ! I think it's one of the firsts pneumatic locomotives, using only Lego parts. I love trains as much as you do on this forum probably, so I hope some steam lovers will enjoy the model ;) The model is based on a Mikado type locomotive, from the mid 20th century. It especially copy the design of 141R french locomotives (even they were apparently built in USA, for France). First of all, the YouTube video and some photos: The idea with this model is to replace the steam of a real Locomotive by compressed air, and this for as much functions as possible. Here are the main functions : Movement of the train : Using 4 pistons, 2 on the sides, and 2 inside, the train can move forward. It works like a classic LPE, with 2 pistons shifted 90° from the others. 4 pistons consume a lot of air, but they guarantee enough power to move the whole train. To make the rotation smooth, a free wheel is hidden inside the boiler part of the locomotive. Its rotation is 25 times faster than the wheels of the train (40t/8t x2). The train isn't moving very fast because the pneumatic elements aren't modified. However, it's fast enough to make it interesting to look at the connecting rods and wheels moving. The breaks : On a real locomotive, compressed air is produced by a compressor (powered by steam) and is used to press some brake shoes against the wheels. Here, the same technique is used : a small piston is filled with compressed air, and thanks to some rods, brakes shoes are pressed against the wheels. It's cool but...it's not enough. Plastic against plastic isn't very efficient to stop the train's movement. Therefore, another rod is connected to the brake system and press another brake shoe against the free wheel. Because its rotation is faster (and therefore, with a low torque), it's is way easier to stop it. The Whistle : A system that I love in this locomotive is the whistle. Currently there isn't any whistle produced by Lego that could be used in the locomotive, so I had to think a little for finding something working. I can give you more details if you want but I used some lego parts that are empty inside and have a small aperture. By blowing air on these parts, we can produce a noise that is a little similar to a whistle noise. This whistle is activated by a switch in the cabin. The Cabin : Nothing much to say except that in contains 3 switches for the 3 main functions (whistle, wheel movement and brakes). There is also a pressure gauge showing the pressure coming from pumps. The train moves with a minimum of 1 bar. A 2-2.5 bars, the movement is faster. The air supply : There are several possibilities for the train : we can directly pump with Lego pumps, or store the air into 6 to 8 airtanks or produce the air with Lego motors and small pumps. For instance I use 4 pumps side by side, linked to some air tanks, but I don't what the final model should work. Maybe some motors and pumps could be cool ? The design : The hard part was to make the boiler of the locomotive. It's a little hard to make cylinders with Lego technic parts but, with flex axles passing through Technic beams, I managed to make something satisfying. Some details are visible on the locomotive, I tried to make it look a little crowded like a real locomotive with fake air/sand tanks, fake compressors and mechanical elements. It's probably possible to make it look better, but for instance I am happy with it. The rails are "homemade" with Lego bricks. The locomotive is too big of course to work on Lego railtracks. The wheels aren't perfectly flat so the train is "blocked" in position inside the rails. Therefore, the train can move foward cur cannot go out of the railtracks (which is great for a train). Finally, as a bonus functions, there are some bumpers at the front and back of the locomotive to imitate the real bumpers used to absorb small chocs on a Locomotive. That's it for now, I hope the model is interesting to you and if that's the case, don't hesitate to support it on Lego Ideas ! Click here to support on Lego Ideas If you have any question or comment, please reply to the post, I'll be glad to discuss with you !
  13. alfredboyer

    Fiat 125p

    Wow I love it, it is really as cute in lego than in real. The best is how the proportions perfectly fit the real model, nice job ! Maybe some blue pins on the body could be replaced by grey friction less pins for better color matching ?
  14. alfredboyer

    [MOC] Lego Pneumatic Steam Locomotive

    Thanks ! :) For storing air I use these blue Lego air-tanks yes.
  15. Hello everybody, I am glad to introduce you my last big project : a pneumatic steam locomotive ! I think it's one of the firsts pneumatic locomotives, using only Lego parts. First of all, the YouTube video and some photos: The idea with this model is to replace the steam of a real Locomotive by compressed air, and this for as much functions as possible. Here are the main functions : Movement of the train : Using 4 pistons, 2 on the sides, and 2 inside, the train can move forward. It works like a classic LPE, with 2 pistons shifted 90° from the others. 4 pistons consume a lot of air, but they guarantee enough power to move the whole train. To make the rotation smooth, a free wheel is hidden inside the boiler part of the locomotive. Its rotation is 25 times faster than the wheels of the train (40t/8t x2). The train isn't moving very fast because the pneumatic elements aren't modified. However, it's fast enough to make it interesting to look at the connecting rods and wheels moving. The breaks : On a real locomotive, compressed air is produced by a compressor (powered by steam) and is used to press some brake shoes against the wheels. Here, the same technique is used : a small piston is filled with compressed air, and thanks to some rods, brakes shoes are pressed against the wheels. It's cool but...it's not enough. Plastic against plastic isn't very efficient to stop the train's movement. Therefore, another rod is connected to the brake system and press another brake shoe against the free wheel. Because its rotation is faster (and therefore, with a low torque), it's is way easier to stop it. The Whistle : A system that I love in this locomotive is the whistle. Currently there isn't any whistle produced by Lego that could be used in the locomotive, so I had to think a little for finding something working. I can give you more details if you want but I used some lego parts that are empty inside and have a small aperture. By blowing air on these parts, we can produce a noise that is a little similar to a whistle noise. This whistle is activated by a switch in the cabin. The Cabin : Nothing much to say except that in contains 3 switches for the 3 main functions (whistle, wheel movement and brakes). There is also a pressure gauge showing the pressure coming from pumps. The train moves with a minimum of 1 bar. A 2-2.5 bars, the movement is faster. The air supply : There are several possibilities for the train : we can directly pump with Lego pumps, or store the air into 6 to 8 airtanks or produce the air with Lego motors and small pumps. For instance I use 4 pumps side by side, linked to some air tanks, but I don't what the final model should work. Maybe some motors and pumps could be cool ? The design : The hard part was to make the boiler of the locomotive. It's a little hard to make cylinders with Lego technic parts but, with flex axles passing through Technic beams, I managed to make something satisfying. Some details are visible on the locomotive, I tried to make it look a little crowded like a real locomotive with fake air/sand tanks, fake compressors and mechanical elements. It's probably possible to make it look better, but for instance I am happy with it. The rails are "homemade" with Lego bricks. The locomotive is too big of course to work on Lego railtracks. The wheels aren't perfectly flat so the train is "blocked" in position inside the rails. Therefore, the train can move foward cur cannot go out of the railtracks (which is great for a train). Finally, as a bonus functions, there are some bumpers at the front and back of the locomotive to imitate the real bumpers used to absorb small chocs on a Locomotive. That's it for now, I hope the model is interesting to you and if that's the case, don't hesitate to support it on Lego Ideas ! Click Here to support :) If you have any question or comment, please reply to the post, I'll be glad to discuss with you !