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Derny Race
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| [Note Guidelines] Photographer's Note |
Went on a photohike with TL buddy Placebo828, andfound a challenge in photographing a Derny Course
A Derny is a motorized bicycle designed and built for motor-paced track cycling events (e.g. motor-paced races in six-day and Keirin racing) or motor-paced road races.
It is driven by both a 98 cc Zurcher two-stroke engine and by being pedalled through a fixed gear, typically of 70 teeth on the front chainring and 11 on the sprocket on the back wheel. The combination allows for smooth acceleration and slowing, important when the front wheel of the rider taking pace is only centimetres from the pacer's shielded back wheel. A further feature is a coupling between the motor and the back wheel which ensures that the machine will not stop dead if the motor stops or seizes up.
The first Derny 'Entraineur' or 'Bordeaux-Paris' models, with their characteristic petrol tank across the handlebars, were built by "Roger Derny et Fils" of Ave. St Mandé, Paris, France in 1938. That firm closed in 1957, though another company called 'Derny Service' of Rue Picpus serviced and rebuilt the machines into the 70s. Derny also built a street adaptation of the original called the'Solo' as well as tandem versions and somewhat unconventional mopeds.
The name derny is now applied to all such vehicles, regardless of manufacturer. It is the word used by the Larousse dictionary as a generic term for a small pacing motorcycle used in cycle races. There have been several attempts to copy or improve on the original Derny. One, the Burdin, was briefly successful but proved not strong enough for repeated fast riding on the steep tracks used in six-day racing. Modern machines are now made by a small company in Neerpelt, Belgium, and the dernys used on the track now are either wholly new or have the original frames but new 90 cc engines.
On a derny, the driver sits close to the back of the bike in an upright position to provide an envelope of low wind resistance for the cyclist drafting or slipstreaming behind. The machine has to be pushed and bump-started. It can then pace riders up to about 90 km/h, although speeds in races rarely exceed 80 km/h.
For most derny races, the cyclist sits in the slipstream of the derny for the duration of the event.
To takevthe phot I followed the Derny to come into my frame. Then I snapped 4 photos. PP includes crop, adding filmgrain and frame, NO processing on colours. |
boonie has marked this note useful
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- datis
![Gold Star Critiquer/Silver Note Writer [C: 113 W: 4 N: 29]](http://i1.treklens.com/misc/g-n-s.gif)
(640) - [2008-09-15 9:59]
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Wow,
Excellent shot Jan, Very good captured with perfect DOF.
Regards, Daryoosh
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- boonie
![Gold Star Critiquer/Gold Star Workshop Editor/Gold Note Writer [C: 1289 W: 69 N: 1538]](http://i1.treklens.com/misc/g-g-g.gif)
(7679) - [2008-09-15 10:00]
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I found your not very interesting. Didn't know this kind of competition existed. Image well captured considering the speed. Glad you included the second pair to increase the interest.
Dan
Well done mangoman. Nice POV, sharpness and composition. The framework is well chosen and a plus for your presentation.
Greetz Perry
Geweldig gedaan.
Vet gaaf
Marine
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