Porsche 911 RSR [RC MOC]

[Daniel-99]

Hello everyone! Im very glad to show my RC Porsche 911 RSR.

As always, story begins far far in the past... My childhood dream was to get an RC car... Some time ago I shared with you a Corvette RC mod, and that was the "first step" in my dream coming true! In that project I understood, that a lego car can go a decent speed especially with the Buwizz 2.0. BUT... But the speed uncovered a another problem, that is the lack of control! Lego bricks have too much wobbling... 

Searching for the solution of this problem in the internet I found several buggy projects with technic bricks that has a positive caster... Ant I instantly understood that the positive caster is the thing I need in my car. Also, I was struggling a lot with gigantic scrab-radius. But in that time all rims produced by lego was symmetric.

Finally, the Land-rover set has arrived... And the new rims give me some hope... Now I was going to build a 1:10 scale car. But the Land-rover set itself was a bad candidate for motorization due to it`s mass and a wobbly chassis. Due to the lack of skills in bodywork I decided to modify the lego set. I choose a Porsche 911 RSR set for my needs.

One would ask me: why you call this RC mod a MOC?

Well, the cassis of lego sets are totally inappropriate for making RC cars - most of them are too wobbly and weak. Moreover I wanted to build a positive caster. So I decided to build a custom RC chassis that will for to the bodywork of the initial lego set.

Here is a front suspension. Yeah, that is my first "finished" chassis with suspension. Do you see some unusual ideas? I managed to build a double steering arms in order to make the steering system stronger. Moreover, I made a double steering rack steered with a single gear... 

On the back I decoded to build a live axle with motors connected directly to wheels: no friction on gears, no weak universal joins...

I used the original instructions to check the dimensions! 

Here you can see the finished chassis - nothing special! I placed several smaller wheels for comparison. I would like to mention, that my first RC car was build with the smallest wheels (the very right wheel on the photo). The main reason why I build a car with small wheels was the lack of power the lego motors have (as I thought back then I was at the very beginning of my lego technic build experience). The main question for now: will the motors have enough power to move this big chassis? I made the first drive, and the car really goes well! Unfortunately I did not make a video, but it was going about 7-8 km/h - that was not a bad speed comparing to the 9398.

After finishing the chassis I started the bodywork.

Then I build front and back parts of the body (with a lot of changes from the original) I decided that it would be great to have a single body-unit that sits on the chassis on several attachment points. And this is the result:

The main reason why I build a detachable body is because I was going to make modifications of chassis!

Hope you like my post and the car ;-) Feel free to comment on technical aspects.

P.S. one fan fact about this car: this RC car has only one gear! - sounds crazy, isn`t it,

[FriedlS]

Great work!!😊

[Alex Ilea]

This is spectacular! I would only critique on the #3 gray conectors in the front, but you may not have them in white.

All in all a great moc!

[Qukie]

Looks very good. I'm in the process of re-building my RSR but assume I will re-model it a bit to look more like the one you created.

[Daniel-99]

After finishing the car I started to develop a new chassis. The main problem of the 1-st version for me is that the structure is broken in the front to make a positive caster. Here is a new version. It has a positive caster as well, but the main issue is solved.

My dear Porsche, it is time to make a pitstop!

Also im sorry for the quality of first pictures... They were made in the building process, and mostly in the late evenings, so no natural light was available...

Hope this photos will make the car to shine!

 

P.S. could anyone help me with tags? Im a new member so I do not know how to add them, and this car should definitely get a "Porsche" tag :-)

Edited November 17, 2021 by Daniel-99

[Jurss]

Good one. Nice to have that detachable bodywork.

[ninoguba]

Nice nice work! Shall look better with white undecorated mudguards. Source for the custom sticker on my post.

Check out my MOD of the same set too, powered by Mindstorms which unfortunately have significantly less power to drive this model fast.

[LEGO Train 12 Volts]

Impressive ...great engineering work!

[Daniel-99]

Further development continue. I build a new chassis with the the new steering system:

- Ackerman steering geometry

- double steering arms

- positive caster

- camber

- zero scarab radius

After that I found that the fender from Land Rover set fits so nicely as a front grill! 

From that moment I could not think of Porsche ;-)

Well,... I think it is time to tell you about the car pictured on my Avatar ;-)