Rudder shear pin
thingiverse
On most bigger RC boats Traxxas Spartan included the rudder is being held by 2 metal bolts. If the rudder hits the rock at high speed, the impact can damage it or even break the boat's transom. To prevent it, one of those bolts can be replaced with plastic sacrificial shear bolt, I think Traxxas even sells them for $5 apiece or so. I designed a replacement that does not use tools to replace. I'm going to make the holder piece a bit less square and more pleasant to an eye but it already serves the purpose the way it is now.
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