how and what should I build a sled jump when it snows?

a good piece of wood into a robust set of blocks Pour water on it and let it freeze well with or without snow is going to be fast. Make sure you put in a place where you can land safely. Not near buildings, fences, streams, etc … who want a wide open space (for) that just rolled out of her wreck, not something that could break some bones!

30 foot sled jump