Video demonstrating our first experience of The Relaxitrator's inexplicable attraction towards lamp posts. (Note: Has some speed-induced swearing)
We only have photos of the complete sled but the assembly process is simple enough to explain.
A pair of old skis
An office chair
Some rough-grit sandpaper
A Hand saw or chop saw for cutting 2x4's
A Hot glue gun
A Drill bit about 1/4 the diameter of your screws for predrilling
~30-40 Screws (we used some drywall screws we found lying around but this is definitely not optimal)
Step 1: Prepare the Runners
Cut some 2x4s to the length of the chair seat.
Drill the 2x4s into the skis where the bindings were. (We used 2 layers of 2x4s because we were concerned about snow clearance)
Make sure to drill the wood to the skis very securely - this is an important joint. To prevent spliting, be careful to leave enough space between the screws (about 1 1/2 inch) and always predrill your holes with a thin drill bit.
Step 2: Prepare the Seat
Step 3: Attach the Seat
Step 4: Install Foot Braces
We started with a piece spanning the the skis to rest your feet on, but this quickly broke when the sled found itself mysteriously attracted to this lamp post on one fateful ride (see photo). After this, one of our foot blocks broke completely off. If you can find a better way to attach blocks here you should use it. Epoxy, hot glue, screwing from below...
Step 5: (Optional) Grip Tape
Step 6: (Optional) Backseat Driver Handles
When drilling into the seat back be careful not to go too close the edge to prevent splitting, and use screws that are not so long that they poke into your back when you lean into the back cushion.
Step 7: (Optional) Speed Cone and Handle
*Everyone looks good in safety orange.
Step 8: (Optional) Rope Attachment
Drill some holes in the front of the seat using a 1/2 to 1-inch diameter drill bit and put some rope or wire through them to make attachment loops for your rope.
We found pushing it worked fine for the most part.
Step 9: How to Ride
For more advanced users, try adding a second person standing on the skis behind the seat. This person can kick to gain extra speed on a slope, or even generate enough power to move on flat ground... At speed, jump on the skis (this is where the sandpaper helps), and shift your weight to cause the sled to turn. Somewhat counterintuitively, you should lean left to turn right, and vice-versa. Shifting your weight back increases the turning effect.
Step 10: More Ideas
A cupholder for beer (or age-appropriate hot chocolate).
Mechanized pedal-treads for reclined uphill climbing.
Team of sled dogs
Onboard sound system
Rocket propulsion through the rear-facing safety cone