Summary

Ursa-rc

Ursa is a great, easy-to-build, light-weight and high-performance chassis, which allows drifting, jumping, rallying, racing, even swimming (I will upload a video of that one day).

Ursa-city

But the Ursa chassis has an excessive height... It's not suitable for classic car bodies. This frame fixes that.

Notes

Also if you need high-performance gears designs that were tested with ursa, please let me know in the comments

For the axles, Ossum diffs can be used...
https://www.thingiverse.com/thing:2579687
The things that are missing from Ossum design, I'll attach here.

Content

• swb.stl short wheel base suspension arm... Same length as original ursa swb. Mirror it for the pair. Use SWB V-arm at the top
• frame03_city.stl low-profile analog of frame03 original ursa part.
• frame01_city.stl low-profile analog of frame01 original ursa part.
• mwb.stl middle wheel base suspension arm. Same lenght as original ursa mwb. Mirror it for the pair. Use MWB V-arm at the top.
• no_turn_hub_2mm_out_of_9mm.stl it's a hub for the rear axis... no turning...
• short_axis.stl the rear axle is bearing more force, so the hex part has bigger size.
• custom_horns_89mm.stl this thing is convenient to fix the body.
• custom_horns_71mm.stl same as previous... just different size.
• wheel_bearing_axis_rounded-short.stl. This axis is sutable for the turning axis of Ossum diff. Put a stick inside (I used 1.85mm nail).

Here you can find an example of ursa-city frame:
https://www.youtube.com/shorts/eo9Ss06YLGw

Questions

If you have any ideas, or need different sizes of axles, please just let me know.