174mph On A Bike

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brynpoeth
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Re: 174mph On A Bike

Postby brynpoeth » 19 Aug 2019, 7:36pm

Added 74 mph by her own efforts? Have the laws of physics been changed?
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Tigerbiten
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Joined: 29 Jun 2009, 6:49am

Re: 174mph On A Bike

Postby Tigerbiten » 19 Aug 2019, 8:11pm

brynpoeth wrote:Added 74 mph by her own efforts? Have the laws of physics been changed?

Why ??

Unlike a "standard" HPV machine, it's a single speed bike.
So you need to get it above a certain speed to reach your minimum usable cadence, +100 mph, hence the tow.
If your below this speed then you cannot generate enough power to keep turning the pedals. This is what happened on their first attempt.
Once above this minimum speed as long as you stay in the air pocket, you can then increase your cadence to increase your speed up to your maximum cadence.

YMMV .......... :D

Mike Sales
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Re: 174mph On A Bike

Postby Mike Sales » 19 Aug 2019, 8:16pm

Tigerbiten wrote:
brynpoeth wrote:Added 74 mph by her own efforts? Have the laws of physics been changed?

Why ??

Unlike a "standard" HPV machine, it's a single speed bike.
So you need to get it above a certain speed to reach your minimum usable cadence, +100 mph, hence the tow.
If your below this speed then you cannot generate enough power to keep turning the pedals. This is what happened on their first attempt.
Once above this minimum speed as long as you stay in the air pocket, you can then increase your cadence to increase your speed up to your maximum cadence.

YMMV .......... :D


From the right windshield you might even get a bit of suction?

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RickH
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Location: Horwich, Lancs.

Re: 174mph On A Bike

Postby RickH » 19 Aug 2019, 10:27pm

One point to note is that the 174mph was measured at the end of a standing start mile (see picture in this BBC link). The article also mentions an intention to go for the absolute record, probably next year.

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Redvee
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Re: 174mph On A Bike

Postby Redvee » 20 Aug 2019, 12:42am

I read the airfield was too short to go for the outright record.

mattheus
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Re: 174mph On A Bike

Postby mattheus » 20 Aug 2019, 10:02am

gaz wrote:
Mike Sales wrote:I imagine the gear needed to pedal at 184 mph would be so big that it would be impossible to get it turning from a stop.

For me it would simply be a matter of reaching 90rpm in top gear* (about 20mph) and then winding it up to 847rpm :wink: .

*By the standards of many my tourer is under-geared.



:lol:

mercalia
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Location: london South

Re: 174mph On A Bike

Postby mercalia » 25 Aug 2019, 9:15am

what a waste of time. and money? what does it really achieve? nothing. vanity. a sign of an empty & unimaginative life, inventing feats for the sake of it? what next , cycle all the way up mt everest? hop skip and jump from John 'o groats to Lands End? Just to get a name in the Guiness Book of Records - The sellers of that book must rub their hands with glee at all these fools making them money? The original moneymaker of which Pokemon Go is the latest, where the makers of that game sell places to the highest bidder eg McDonalds to get player to go there & possibly buy a Big Mac :roll: Just a simple monetrisation of peoples contrived experiences. There are two games going on here - the contrived participants one and the real one that matters?

What does man gain by all the toil
at which he toils under the sun?
Last edited by mercalia on 25 Aug 2019, 9:40am, edited 4 times in total.

brynpoeth
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Joined: 30 Nov 2013, 11:26am

Re: 174mph On A Bike

Postby brynpoeth » 25 Aug 2019, 9:31am

Right again mercalia, BSA Bike-shaped-activity that has nothing to do with cycling :?
Entertainer, juvenile, curmudgeon
Cycling-of course, but it is far better on a Gillott
We love safety cameras, we love life