Recommended Posts

Posted (edited)

As inspired by pg5200's Buggy and Tamiya's Fighting Buggy, I've built this RC Buggy MOC. It's simple, fast and stable. 

Features:
- Total no. of pieces is less than 400
- Around 1/15 to 1/16 scale
- Requires a BuWizz 1.0/2.0 or CaDA or Mould King remote battery hub (SBrick should be possible by placing the hub on top of the battery box)
- PF Servo Motor for the steering
- RC Buggy Motor or BuWizz Motor for the rear driving
- Gear ratio is 1.4 : 1
- Transverse damper rear suspension similar to Fighting Buggy
- Rear camber angle is about +1 degree
- Optional 4 LED lights (instruction not included)

Instruction available at https://rebrickable.com/mocs/MOC-76795/

Have fun and enjoy!

51178601046_dfc7d0e636_c.jpg

It's not in Minifig scale, just give you an idea of its size.

51177917812_5fe412f768_c.jpg

51177917852_dd197242f1_c.jpg

It has a +1 degree of rear camber angle.

51178823118_2c043f6fe0_c.jpg

 

Edited by A_C
Added test run video

Share this post


Link to post
Share on other sites

That's a really good looking buggy, at least it's properly hiding the motors inside the body, but I think you should make a video showing how it works - the gearing matters, so it may be either really slow or won't be able to climb at all etc.

Share this post


Link to post
Share on other sites
3 minutes ago, SaperPL said:

That's a really good looking buggy, at least it's properly hiding the motors inside the body, but I think you should make a video showing how it works - the gearing matters, so it may be either really slow or won't be able to climb at all etc.

From what i can see it could/should be a 1,4:1 gearing. Could reach 2,5 to 4km/h. Not sure about the torque.

Share this post


Link to post
Share on other sites

Am I missing something, or does "1° camber" actually mean "I didn't make a strong rear axle"?

2 hours ago, Andman said:

From what i can see it could/should be a 1,4:1 gearing. Could reach 2,5 to 4km/h. Not sure about the torque.

56mm tyres * pi for circumference * 1240rpm on a buggy motor at 9v * 20/28 reduction on the differential * 60 minutes in an hour / 1,000,000 mm in a km

=9.3km/h

With so few parts I'm betting it'll rip.

Share this post


Link to post
Share on other sites
25 minutes ago, amorti said:

Am I missing something, or does "1° camber" actually mean "I didn't make a strong rear axle"?

It's feature, not a bug!

26 minutes ago, amorti said:

56mm tyres * pi for circumference * 1240rpm on a buggy motor at 9v * 20/28 reduction on the differential * 60 minutes in an hour / 1,000,000 mm in a km

=9.3km/h

I'm tempted to disagree. Looks like the slower output is used, thus 780rpm @9V (According to Philos homepage). That's nearly 6km/h... in theory. But i might be wrong.

Share this post


Link to post
Share on other sites
Posted (edited)

@Andman you've come from 2.5-4 to nearly 6, but you're still wrong - one of us read Philo's page wrong (it was you).

I'd like to know how you get 1° of camber in Lego on purpose, unless it means 1° of slack either direction from square.

Edited by amorti

Share this post


Link to post
Share on other sites
Posted (edited)
12 minutes ago, amorti said:

@Andman one of us read Philo's page wrong (it was you).

You are referring to the non-loaded characteristics, which is described here:

rpm-v-5292.gif

I was referring to the loaded characteristics.

r5292-t.jpg
5292

Torque

Rotation
speed

Current

Mechanical
power 

Electrical
power 

Efficiency

4.5 V

5.7 N.cm

150 rpm

1.36 A

0.87 W

6.12 W

14 %

6 V

5.7 N.cm

380 rpm

1.38 A

2.27 W

8.28 W

27 %

7.5 V

5.7 N.cm

580 rpm

1.37 A

3.45 W

10.3 W

34 %

9 V

5.7 N.cm

 780 rpm

1.40 A

4.61 W

12.6 W

37 %

10.5 V

5.7 N.cm

1030 rpm

1.46A

6.16 W

15.3 W

40 %

I'm again tempted to say that the values from table of loaded characteristics are closer to the real life conditions for this moc than the non-loaded characteristics of that motor.

Your turn :-)

Edited by Andman

Share this post


Link to post
Share on other sites

Well, it runs on buwizz, so that's 11.2v which would give somewhere over 1030rpm.

I'll accept a mutual loss :pir-huzzah1:

Share this post


Link to post
Share on other sites
4 minutes ago, amorti said:

Well, it runs on buwizz, so that's 11.2v which would give somewhere over 1030rpm.

I'll accept a mutual loss :pir-huzzah1:

:-D I didn't read that it is powered by a buwizz. That's a game changer. There is only one solution! @A_C, please make a video and show how fast it can go!

Share this post


Link to post
Share on other sites

Thanks all for your feedback.

First of all, I don't have a BuWizz, and I'm using a compatible Buggy motor only. When the remote battery is fully charged, it has about 8.1V

51181096597_b38d6b887e_c.jpg

And I've just uploaded a test run video but I cannot provide the actual speed in readings. But I think it's pretty fast, and it's definitely not a climber or crawler.

 

Share this post


Link to post
Share on other sites

Just added another yellow version at here. It's not only another color version, but also replaced the expensive light reflector parts.

51192931432_d106266bf1_c.jpg

Share this post


Link to post
Share on other sites

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now

  • Recently Browsing   0 members

    No registered users viewing this page.