Ciapasty Posted January 12, 2015 Posted January 12, 2015 Hi everyone! So, during christmas I had a lot of free time and decided it's time for another attempt at build a supercar. I've chosen Lancia Beta Monte Carlo. Mainly because the body is not round. Well, at least not very round and the car looks good. Let's get to the technical details: - The engine is on the back, and it has a rear wheel drive. It's R4 engine (4 cylinders in a row) mounted crosswise. - McPhersson suspension on both axles. - 5+R gearbox - aaaand.. nothing more out of the ordinary What I'd like to have in it is: - Full independent suspension, of course McPhersson (with at least little geometry) - Full RC - at least 3+R gearbox - fake R4 engine mounted crosswise (that would look cool) Now, my hands made this thingy : Some commentary is needed. It's full RC, as you can see. It drives pretty neatly with two L motors, but skips one tooth in some gear at third gear (only one! and only when driving forward). Also it's Piterx's desing (http://p-lego.blogspot.com/2013/01/lego-rc-sequential-gearbox-3r.html). It's small, compact and functional. I'd like to see it with Servo Motor, because it's easy to miss gears... A bit of research (first result on google ) led to this beast http://www.doublebrick.ru/blogs/jackson/4-h-stupenchataya , but I'd have to order some parts to assemble it. It's a bit smaller than Piterx's and there is nothing sliding out of gearbox. Also, Servo This may even make some space for, now absent, fake engine. The suspensions is a combination of nicjasno's McPhersson and Sheepo's MPS. The second battery pack is a bit redundant, but I just couldn't fit one in, to have a symmetry. They have to be disassembled, because they take space where chairs should be I'd like to fit one on the back, but it's too tall.. Same problems on front. That's something to think about, and experiment. The chassis falls a bit short on stiffness, but a good bodywork should fix it. If anyone have an idea how I could make this gearbox and engines more compact, feel free to comment! I'd like to hear what you think about it Quote
timslegos Posted January 12, 2015 Posted January 12, 2015 Looks like a great start, and interesting suspension design. How well does it work? I tried building a supercar some time ago and the suspension often flexed too much for it to work properly. I look forward to seeing the final product. tim Quote
PKW Posted January 12, 2015 Posted January 12, 2015 I like lancias, but i love the rally version of them *-* this chassis looks great, only I can't understand how your gearbox works :( hope this car will have a good speed, also i think the big gear in the steering servo is a great choice, hope you will use the rally version design for the bodywork, it is more squared :3 Quote
LeocornoProductions Posted January 12, 2015 Posted January 12, 2015 Can't wait to see how great it will turn out Quote
cgg199 Posted January 12, 2015 Posted January 12, 2015 Looks like a great start! Have you considered using one of Piterx's newer designs? They are smaller and have more accurate gear changes. Just a thought. Quote
Ciapasty Posted January 12, 2015 Author Posted January 12, 2015 Rear suspension works great, front works a bit worse, and a lot worse when wheels are turned. Sadly, it's not fast.. but enough to have some fun I'll try to find these new desings, and try them out. The key is to fit the gearbox between rear suspension, and leave space for untouched interior. Quote
Rishab N Posted January 12, 2015 Posted January 12, 2015 Great start. You could try using one of the AAA battery boxes to save space Quote
5imon Posted January 12, 2015 Posted January 12, 2015 Cool! I always like to see italian and french cars from the 70es and 80es. I wonder how the body will turn out, I really dig these angular designs. Quote
MusicaRibelle Posted January 12, 2015 Posted January 12, 2015 I am in awe of this work, and I can't really comment on the mechanics, except that I totally admire it. What color will the body be in? I had a Corgi model in blue as a kid, loved it. Quote
PKW Posted January 13, 2015 Posted January 13, 2015 why You don't try To use long shocks for The steering issue? They probably have To be fixed on a lower point But they are more stable Quote
Lucio Switch Posted January 13, 2015 Posted January 13, 2015 Why not a Lancia 037? it's very similar, but looks better. Quote
5imon Posted January 13, 2015 Posted January 13, 2015 (edited) I don't think the 037 looks better. It is certainly a good rally car, but the design is not more than just functional. I prefer the fine lines and accentuated angles of the Montecarlo. But this is certainly a matter of taste. At least I'm happy about Ciapasty's choice ;-) Edited January 13, 2015 by 5imon Quote
Ciapasty Posted January 13, 2015 Author Posted January 13, 2015 9L shocks are too long. This car is pretty flat.. they would not fit under the hood. I did notice that all yellow shocks perform pretty even slightly flexed. In this suspension they do not flex much. They are fixed tight at the wheel, otherwise the suspension wouldn't work The problem with front suspension is the top mounting. During steering the point where the force is applied at the top mounting shifts outside the black blicks supporting the structure, which couses unwanted flexing. If it's not clear, ask My plan is to make it in read, just as the picture in the first post. But the piority is the fully functional chassis. Also the plan is to make detachable body to be able to work on both body and chassis independently. I do not plan on making it drive fast. 2 L motors would not handle the gearbox, and the weight of completed model. Best for speed would be two RC motos, but I do not own them, and they are not a part of the plan. Part of the plan was to use one XL motor, but two L fitted better Don't be discouraged if I do not post anything new, but I do not have much time, and sometimes I'm just too tired to even think about building. Ah! One more thing about the steering. I do not use the 20T gear for steering, there is standard 12T. The big one is used to transfer steering to steering wheel Quote
Ciapasty Posted January 25, 2015 Author Posted January 25, 2015 Let's have some updates!! It's the third gearbox I've tried. This one works properly at last It's the new Piterx design. The only problem I had with it is that the highest gear works smoothly when turned one way and works badly the other way. The gear switching mechanism is from some russian (or other eastern european country) website, and works pretty well with servo and Piterx's gearbox. I also managed to fit one XL motor, fake engine and battery pack on the back. Fake engine can easily be switched for another XL motor, but I only have one at this point. IR recievers are in great position right now, I hope that I won't move them. I also do not own the AAA battery box. There is a plan on buying one, but that's not a near future I works well just how it is right now. Quote
Ciapasty Posted March 11, 2015 Author Posted March 11, 2015 (edited) There is some progress! What I managed to do was to finally get some free time to tinker with this. The gear changing mechanism got 2 studs narrower, and it also made the construction a bit stiffer. I also started building interior. This is the second version of seats. As you can probably see there are big holes in seats . It's mainly because the gear changing mechanism takes a lot of space and has to have space to move, so they are necessery. Another thing worth noting is a space next to the L motor. There used to be fake 2-cylinder engine, but it was just pathetic, so this space waits for another XL motor . It should drive better with two XL motors. The next goal is to make dashboard and bumpers. More updates soon, I promise Edited March 11, 2015 by Ciapasty Quote
VKTechnic Posted March 11, 2015 Posted March 11, 2015 The empty space in the front is telling me "Oh just put the engine there!" Too bad it's a rear-engine car Quote
__________________________ Posted March 11, 2015 Posted March 11, 2015 The empty space in the front is telling me "Oh just put the engine there!" Too bad it's a rear-engine car If the XL motor in the back (it provides drive, right?) was replaced with 2 L motors the speed of this car would double and there would be vertical space for the engine, although hard coupling 2 L motors would require 1 additional stud length wise. Good work so far! You'd shave a good deal of weight, however, if you replaced the $10 AA battery boxes with $50 8878 batteries. Quote
Ciapasty Posted March 12, 2015 Author Posted March 12, 2015 @TheLegoExpert How is it possible that L motors, with less torque, would make it go faster on high gears? I always thought that more power counters the backlash on gearbox and weight of the model, so it runs faster. Quote
PKW Posted March 12, 2015 Posted March 12, 2015 2L motors have more or Less The same power o 3M motors/1XL But They have more speed thai The XL ;) Quote
Ciapasty Posted March 12, 2015 Author Posted March 12, 2015 Update! I think that commentary is not needed to this update . Quote
Rishab N Posted March 12, 2015 Posted March 12, 2015 You'd shave a good deal of weight, however, if you replaced the $10 AA battery boxes with $50 8878 batteries. Or the much cheaper 12 dollar AAA battery box Quote
VKTechnic Posted March 13, 2015 Posted March 13, 2015 That dash looks really nice, a bit boxy around the steering wheel though Quote
Ciapasty Posted March 13, 2015 Author Posted March 13, 2015 @VKTechnic, because it is a bit boxy Quote
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