Vehicle mod: FR250
Details page: https://www.lfs.net/files/vehmods/7F891E

SHORT DESCRIPTION:

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Small formula with single-cylinder motorcycle engine

DESCRIPTION:

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The idea of ​​this vehicle is to represent a low cost category in Live for Speed. A basic formula, without much to contribute other than fun handling.

COVER SCREENSHOT:

Nice details and I like to see more low cost race cars.
The side-mounted engine is interesting, is that based on any existing vehicle? I know some sprintcars have sidemounted engines because they only turn left (ovals) and their V8 engines are heavy.
Also go-karts, but this is larger.

The car has interesting and unique design features. But that makes me wonder if it would work like that in real life.

1) The chasis is too small, too low. The driver's bottom and feet are sticking through the floor. At the feet it would need bit more space for pedals and steering mechanism, so the front can not be so pointy.

2) The belt/chain from engine to axle:
-The chain touches the suspension.
-The drive axles must follow the up&down movement of the supension. So it needs some joint. But *right at the point* where this joint would need to be, attaches the pinion for the chain.

3) The U-pipe of the exhaust pipe looks fragile and prone to be damaged in crashes. Maybe if the exhaust attachs to back of cylinder then it could just do a 90° turn and end behind the seat. It would be better protected.

4) The mounting place for the fuel tank also unusually high. Is it meant to be gravity fed? Race cars want lower center of gravity. It also could be damaged in case of rollover and is quite close to the driver's head.

5) The rollbar is too low, head still touches the ground.

That said, I think it is okay have a vehicle with flaws, afterall this represents a low-cost hobby formular. And maybe they do not care that much about safety and rollbars, afterall LFS is a fictional perfect world where nobody gets hurt in crashes

Quote from Gutholz :

Nice details and I like to see more low cost race cars.
The side-mounted engine is interesting, is that based on any existing vehicle? I know some sprintcars have sidemounted engines because they only turn left (ovals) and their V8 engines are heavy.
Also go-karts, but this is larger.

The car has interesting and unique design features. But that makes me wonder if it would work like that in real life.

1) The chasis is too small, too low. The driver's bottom and feet are sticking through the floor. At the feet it would need bit more space for pedals and steering mechanism, so the front can not be so pointy.

2) The belt/chain from engine to axle:
-The chain touches the suspension.
-The drive axles must follow the up&down movement of the supension. So it needs some joint. But *right at the point* where this joint would need to be, attaches the pinion for the chain.

3) The U-pipe of the exhaust pipe looks fragile and prone to be damaged in crashes. Maybe if the exhaust attachs to back of cylinder then it could just do a 90° turn and end behind the seat. It would be better protected.

4) The mounting place for the fuel tank also unusually high. Is it meant to be gravity fed? Race cars want lower center of gravity. It also could be damaged in case of rollover and is quite close to the driver's head.

5) The rollbar is too low, head still touches the ground.

That said, I think it is okay have a vehicle with flaws, afterall this represents a low-cost hobby formular. And maybe they do not care that much about safety and rollbars, afterall LFS is a fictional perfect world where nobody gets hurt in crashes

Hello Gutholz! Thank you for taking the time to leave a comment! This mod came from the idea of ​​joining a karting with a formula. Achieve a car with chassis variants and that is apparently a low-cost car.
Try to make the chassis as small as possible, without thinking about safety, a sarcophagus on wheels. In the process, a friend told me that it is similar to an Argentine category "metropolitan formula 5" from there I was inspired by the fuel tank and some details. I found the position of the fuel tank and the connection of the engine super curious, so I decided to keep everything in that position. Regards my friend! and thanks for commenting

https://youtu.be/zKuRBmhAdaI
https://youtu.be/GU53l_qoVTw

Thanks for explaining and the youtube links.

The rear of your vehicle currently looks like this:

There is a double wishbone suspension. Each wheel can move indepedent from the other wheel.
That means the axle is not a solid piece, there needs to be a coupling that allows the axle to "bend" at (at least two) points where the two green circles are. ( https://en.wikipedia.org/wiki/Constant-velocity_joint )
The problem: At the position where the joint needs to be, is also the chain drive.
The chaindrive would need to be more towards the middle but then it would collide with the chasis. The chain can not be more towards the outside because that part of the axle does not line up with the engine. (not parallel)
In your model the chain also clips into the suspension bars.

So how do these vehicles do it?
I looked at several photos and it seems:
All vehicles with side-mounted engines do not use double wishbone suspension. There use something simpler:

(from your video)
green: solid axle without joints/couplings.
red: chaindrive
blue: single brake disk. one brake for both wheels. This works because there is no differential gear.
yellow: coils for suspension. I think the whole axle can only swing up/down - like in a motorcycle.
But it can not even "twist", or not much: I do not see how the chaindrive would work if the axle does not always stay parallel to the chasis.

another picture:



A few cars do use double wishbones, but they all seem to combine it with a rear mounted engine.
That way the chaindrive can be in the middle. Basically like the MRT5.




pictures from http://formula5metro.com.ar

I really appreciate your time to look for ways to make the modeling more realistic. when creating the rear axis use the tools that the editor provides us, the problem is that it is quite limited in some aspects. With regard to the fact that the suspension at one point of its travel touches the transmission, it is repairable but on the other hand I cannot create a more realistic axis joint (it is possible to create a model of a "Homocinetica” but it would remain static and would not contribute anything to the model) . The central axis is simply a tube made in the editor, very basic, and at the ends I attached two suspension arms of the same diameter, simulating being the axes. (The suspension arms are the only objects that the editor allows us to make work with respect to a point). possibly lower the main axle a little, so it does not have contact with any point of the suspension. Greetings my friend! I really appreciate the time you spent on research, I'll try to find a way to put it into practice in the car!