I've just remembered another embarrassment (sadly again without pics)...
Aged around 12/13 and eager to join the fledgling local RC club, I set about making a car suitable to race in a school playground where they were racing at that time. I only had a Hornet as a base to work from, but I liked the design of the old Tamiya F1 cars of the era, so set about making a 'GT' equivalent.
Using aluminium sheet that was far too thick (Probably about 3-4mm), I made a delta shaped chassis with various acrylic blocks to hold the axles etc. The Hornet axles were used and the motor was mounted to run directly onto the diff without a middle gear and the wheels were from the Hornet with foam tyres mounted. I then painted (badly) an Opel Calibra DTM shell and mounted that and it actually looked reasonably good for a 12/13 year old.
A road opposite me was closed for repair works to a railway bridge, so I took the car down there and conducted some straightline (this bit is crucial) tests and it was impressively quick. So the next week I took it along to the club to give it a run in the playground.
Well a couple of tentative exploratory laps suggested it had some straightline speed but even taking it very slow in the corners there was chronic understeer. Being young, naive and lacking virtually all knowledge of vehicle dynamics, I decided to try going faster. Well it rocketed down the straight and barely turned as it ploughed into the kerb at the end, flipping end over end for about fifteen meters into the playing field. Bent and battered it still ran, but it was as I was straightening it out that somebody pointed out to me that I had fitted the steering servo infront of the front axle, with the uprights pointing the wrong way - so the Ackerman was actually running backwards and steering was all but pointless.
I did fix it eventually, but by then the club had moved to an indoor track where it wasn't nimble enough.
Good times though.
