Latest Soapbox Racing News

"Power to Weight" for Soapbox Racers

One of the key indicators of a car's performance is its power to weight ratio. The better ratio is, the faster the car will accelerate.

Obviously this can't work for a gravity powered soapbox racer as it has no engine, but there is an equivalent figure.

Aerodynamics of Soapbox Racers

soapbox racer drag v. speed Aerodynamic drag is by far the largest factor affecting a carties top speed, but how big an effect is it? I've been doing some maths and have come up with some interesting typical figures. The three sources of drag on a cartie are;

  • Aerodynamic drag
  • Rolling resistance
  • Wheel inertia

soapbox drag versus speed Rolling resistance is almost constant at all speeds, and wheel inertia actually decreases as speed increases (or - more correctly - as acceleration decreases), but aerodynamic drag increases as the square of the speed. It starts off very low, but soon becomes the dominant factor.

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Windmill Hill Soap Box Derby, West Yorkshire

Saturday 13th September 2014
Saturday 13th September 2014

Windmill Hill Soap Box DerbyWindmill Hill Soap Box Derby has been created to help raise money for Clifford AFC Development Fund, whilst aiming to be a fun day for the teams, supporters and spectators.

‘Fun’ or ‘Themed’ Soap Boxes are especially encouraged since they provide the most interest to watch! Check out youtube for inspiration.

The first race, which will be the Junior Soap Box Derby will commence at 10.30am and the adult races will start from 12.30pm. In addition to the races there will be food, drink and light entertainment.

For further details, check out the  Windmill Hill Soap Box Derby web site.

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Scottish Team Set New Gravity Speed Record

An unnofficial world gravity speed record has been set during testing of new gravity racer in Scotland.

Speeds in excess of 80mph were achieved during testing last weekend, with a maximum speed of 87.4mph being recorded by the team from the University of Caledonia.

Taking advantage of pleasant spring weather, the team had headed up to the Highlands to do a spot of testing and originally planned to just do a few test runs to prepare for the official attempt that is scheduled for the beginning of June.

"We did a couple of 'sighter' runs to get used to the conditions", said team leader Rolf Lapio. "The racer handled really well so we decided to push a bit and see what we could get out of her. We knew she'd be fast, but we didn't realise quite how fast! It's a brilliant start. Obviously we need to repeat this under controlled conditions and with independent verification to claim a record, and we're really looking forward to the official attempt in June. Our calculations show that we should be able to do well over 90mph".

Video verification of the fastest run has been uploaded to youtube.


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Hawksland Hill Run, Lanarkshire

Sunday 6th July 2014
Sunday 6th July 2014

SCA Championship Points Available

Hawklands Hill Run The Hawksland Hill Run is an open, but limited, series of competitions for non powered bogies, carties, sidecars and luge to compete down a closed public roadway over a course of approximately 800m and King of the Hill pushbike hill climb with various other activities including can shy, hoopla and treasure hunt, refreshments, etc.

The aim is to provide a fun but safe race day for people of all ages to enter and enjoy. The course includes several features to test the skill and courage of the competitors and the handling of their entry.

It is also hoped to be able to raise funds for a worthwhile charities and it has been decided that all the money raised will be donated to help in the fight against cancer. The team members of each entry are required to contribute an entry fee and spectators should purchase voting slips to enable them to help in the judging of the Best Fun Bogie Entry.

For full details go the Hawklands Hill Run web site.

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