KiwiWill said...I remember being at an organised scouts billy cart event as a kid. The Dads found one of the steepest hills in Wellington and sent the kids flying down the hill... Untill there was a serious rollover, an ambulence actualy attended...
Event was put on hold untill they found a boring gentle gradient to finish the day off...
Our scout troops(Mirrabooka district) used a section of Warwick? road that had recently been realigned, leaving a beaut long bitumen downhill stretch.
Local council dumped several truckloads of dirt at the bottom for us to run into, and a couple of chicanes half way down.
My kart had flash big golf buggy rear wheels and its front wheels even had proper "bought from a shop" bearings (hammered) into them.
Going through the chicanes peeled the tyres off the rear rims, it was a rather memorable experience going sidways at 657654678696mph on steel rims, and hitting the dirt at the bottom of the hill.
timber 4 x 2 rollcages actually hang together
took the remains home, bolted a holden generator and 12v battery to it, with toaster elements as a speed controller, pushy wheels at the back and derailler chains/ cogs for gears.
me and my accomplices got busted on Coolibah Drive in Greenwood opposite the high school.
We got a REAL BIG SERIOUS lecture from a pretty cool copper over that episode.
I was pleasantly surprised when she said it's the pram tire! 
Back to dad's workshop and start again.
