Building a soapbox racer (aka go-cart.... aka gravity racer)

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OP
OP
simon the viking
IMG_20170601_151057.jpg


Finished putting it together.... going to test on Saturday before final trimming/finer details. Then fix any design flaws then paint.. managed to get find some suitable outside gloss in green so may go for a M*A*S*H jeep look.

The front wheels are a bit small. So bit more of a dragster look than I anticipated...

when we were building the axles up with the bush bearings and lock nuts Ben said "I didn't know you were this clever" .... I don't know whether it was a compliment or not!
 

classic33

Leg End Member
View attachment 354933

Finished putting it together.... going to test on Saturday before final trimming/finer details. Then fix any design flaws then paint.. managed to get find some suitable outside gloss in green so may go for a M*A*S*H jeep look.

The front wheels are a bit small. So bit more of a dragster look than I anticipated...

when we were building the axles up with the bush bearings and lock nuts Ben said "I didn't know you were this clever" .... I don't know whether it was a compliment or not!
Something on the top of the backboard to avoid it digging in to the back.
 

Salad Dodger

Legendary Member
Location
Kent Coast
My dad built a soapbox cart for me and my best mate to play on when we were kids. An old scaffold board, back wheels from an old kids trike that he hacksawed in half and bolted on, and front axle from (I think) a pram. The backrest for the seat was a bit of old table or desk top. Of course, my mate and I took turns to be driver or pusher.

The cart was supposed to be steered by a bit of rope (old hemp washing line) but we could never hold the steering straight enough, so it always ended up veering to one side or the other within about 5 feet of setting off on the thing.

So me, being the inventive type, had an idea. Move the backrest further forward, so my feet now reached the wooden crosspiece on which the front axle was mounted. Use my feet in conjunction with the steering rope to maintain something like a straight course. It worked pretty well going along the pavement out the front of my house. Sometimes we went along the front of the whole block from number 2 to number 36 without serious incident.

But not so, when I ventured down the alley behind the houses. There was a slope going down into the alley at one end, so it seemed a great place to try to set a new off-road speed record for the cart. The alley surface was mostly compacted dirt and gravel, but with a few broken bricks stuck up through the surface. My mate pushed me down the slope into the alley like a bobsleigh being set off at the top of The Cresta Run, but when the front axle contacted a sticking up brick the whole thing turned sharp left, despite the (foot) power assisted steering modification, jamming my ankle bone against the side of the cart and pitching me off into the dirt and gravel in an epic crash.

Of course, my mate was convulsed in hysterical laughter, and it took several weeks for my ankle to stop hurting...

This episode is one of those moments of childhood that I had completely forgotten about, until the memory was revived by this thread in Cyclechat. Thanks, guys, for letting me take a trip down memory lane, or down a back alley in Northfleet.
 
OP
OP
simon the viking
Tested down the park.... No major problems apart from R/H back wheel lock nut kept winding off. Had took an adjustable spanner for any nut related emergencies...

Got some smiles off motorists on the way.... and few glances off yoofs playing football and walking back Ben said he really enjoyed it and thought it was fun.... so mission achieved but Mrs has told him Its only to be used when I'm around... actually I don't want him taking it on his own as manoeuvring it around the cars parked half on the pavement proved a challenge....

No photo's I'm afraid forgot my phone...

Next step a coat of paint and stickers (or printouts off google then varnished) I think....
 

Mark Grant

Acting Captain of The St Annes Jombulance.
Location
Hanworth, Middx.
A couple of weeks ago there was a skip outside a house down the road from where I was working In the skip was a 1950's or '60s pram chassis, big back wheels and smaller front, just like the ones we used to build go karts when we were kids. A quick knock on the door of the skip owner and into my van.
This afternoon after a bit of cutting and welding, and some woodwork I've knocked up the basic kart.
I'll take a picture tomorrow.
 
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