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Vincent Picador Drone Aircraft Engine
- Thread starter Bernhard
- Start date
- Joined
- Nov 11, 2008
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- 834
Some words to accompany:
http://www.voc.uk.com/net/docs/17/17-713-12.pdf
http://www.voc.uk.com/net/docs/17/17-713-12.pdf
With the Picador testing, Vincent learned that their stock crank was not unbreakable when pushed to high sustained rpm.
In fact, it came apart rather quickly on the testbed. It was decided to build a new type of crank and build it much stronger with larger mainshafts and a larger big end pin. In addition, there are no nuts recessed into the flywheels to hold the crank together. Instead the large interference fit pin goes right thru the full width of each flywheel giving about 4 times the interference fit contact area of the standard crank. Vincent referred to this as a "fourteen ton interference fit" as opposed to the standard crank pin which required around six tons pressure to assemble.
When the Vincent factory saw how quickly the standard crank let go, they contacted world motorcycle speed record holders Burns and Wright to notify them of the potential hazard. They also supplied them with a Picador style crank, which is still in the bike today. George Brown also used Picador style cranks in both Nero and SuperNero.
We will never know how close to catastrophic destruction the Burns & Wright Lightning was when it set the world record of 186mph on the Tram Road in NZ, 1955. It had the standard crank in place at the time.
The crank for my 1360 motor is a Picador style crank supplied by Terry Prince. More than one knowledgeable Vincent mechanic has told me that this type of crank is totally unnecessary and the the stock Vincent crank is "the Forth Bridge of cranks", however history proves this is not so, at least not if extreme use is planned.
Glen
In fact, it came apart rather quickly on the testbed. It was decided to build a new type of crank and build it much stronger with larger mainshafts and a larger big end pin. In addition, there are no nuts recessed into the flywheels to hold the crank together. Instead the large interference fit pin goes right thru the full width of each flywheel giving about 4 times the interference fit contact area of the standard crank. Vincent referred to this as a "fourteen ton interference fit" as opposed to the standard crank pin which required around six tons pressure to assemble.
When the Vincent factory saw how quickly the standard crank let go, they contacted world motorcycle speed record holders Burns and Wright to notify them of the potential hazard. They also supplied them with a Picador style crank, which is still in the bike today. George Brown also used Picador style cranks in both Nero and SuperNero.
We will never know how close to catastrophic destruction the Burns & Wright Lightning was when it set the world record of 186mph on the Tram Road in NZ, 1955. It had the standard crank in place at the time.
The crank for my 1360 motor is a Picador style crank supplied by Terry Prince. More than one knowledgeable Vincent mechanic has told me that this type of crank is totally unnecessary and the the stock Vincent crank is "the Forth Bridge of cranks", however history proves this is not so, at least not if extreme use is planned.
Glen