Hello!

Mom here building a small wooden bike ramp for my boys and need help figuring out how to mark the curved side profile.

Here are the details:

Ramp height: 15”

Ramp length (ground to top): 48”

Top platform: 24” x 55” (already cut)

Side panels: 15” x 48” plywood (this is the piece of wood I need the side curves cut from)

I understand how to frame it, but I’m stuck on how to accurately draw the curve for the sides before cutting with a jigsaw.

I’ve seen people mention using a string or “DIY compass” method, but I’m not sure where exactly to place the pivot point or how to determine the correct radius for a smooth transition.

I’ve attached a sketch showing the dimensions and highlighted the curve I’m trying to create.

What’s the best way to lay out this curve so the ramp rides smoothly (not too steep at the bottom or too flat at the top)? Any simple methods that don’t require specialized tools would be awesome.

Thanks in advance!