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Required DC gearmotor horsepower to push a bicycle?



 
 
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  #1  
Old January 24th 11, 09:06 PM posted to rec.bicycles.tech
John Doe
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Default Required DC gearmotor horsepower to push a bicycle?

Specifically... What is the approximate required horsepower for a DC
gearmotor to push a bicycle at 20 mph or less on terrain less hilly
than San Francisco.

Thanks.
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  #2  
Old January 24th 11, 09:32 PM posted to rec.bicycles.tech
John Doe
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Posts: 51
Default Required DC gearmotor horsepower to push a bicycle?

....or inch/pounds of torque.
  #3  
Old January 24th 11, 09:51 PM posted to rec.bicycles.tech
UglyEcho
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Default Required DC gearmotor horsepower to push a bicycle?

John Doe wrote:
...or inch/pounds of torque.


It depends on the size of the lard bucket sitting on the seat. 1/3 hp net at
the wheel will sustain about 20 mph on the flat, no wind.

  #4  
Old January 24th 11, 10:30 PM posted to rec.bicycles.tech
[email protected]
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Posts: 445
Default Required DC gearmotor horsepower to push a bicycle?

On 24 Jan 2011 20:06:01 GMT, John Doe wrote:

Specifically... What is the approximate required horsepower for a DC
gearmotor to push a bicycle at 20 mph or less on terrain less hilly
than San Francisco.

Thanks.

Well, the legal limit in Canada is 350 watts - that's roughly 1/4 HP
in real power output - and is marginal if you do not pedal. I'd say
1/2 HP would be pretty reasonable, and 1 HP much more than adequate.
  #6  
Old January 25th 11, 03:02 AM posted to rec.bicycles.tech
thirty-six
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Default Required DC gearmotor horsepower to push a bicycle?

On Jan 25, 1:44*am, Tēm ShermĒn™ °_° ""twshermanREMOVE\"@THI
$southslope.net" wrote:
On 1/24/2011 3:30 PM, wrote:

On 24 Jan 2011 20:06:01 GMT, John *wrote:


Specifically... What is the approximate required horsepower for a DC
gearmotor to push a bicycle at 20 mph or less on terrain less hilly
than San Francisco.


Thanks.

Well, the legal limit in Canada is 350 watts - that's roughly 1/4 HP


1/2 HP is about 373 watts.

in real power output - and is marginal if you do not pedal. I'd say
1/2 HP would be pretty reasonable, and 1 HP much more than adequate.


3/5 to 2/3 HP is roughly equivalent to top UCI professional time trial
output.

--
Tēm ShermĒn - 42.435731,-83.985007
I am a vehicular cyclist.


They better 30mph whatever their output is.
  #7  
Old January 25th 11, 04:02 AM posted to rec.bicycles.tech
TriGuru55x11
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Posts: 7
Default Required DC gearmotor horsepower to push a bicycle?

On Mon, 24 Jan 2011 14:51:50 -0600, UglyEcho wrote:

John Doe wrote:
...or inch/pounds of torque.


It depends on the size of the lard bucket sitting on the seat. 1/3 hp net at
the wheel will sustain about 20 mph on the flat, no wind.


Common knowledge has bicyclists always riding into the wind, regardless of
direction, a perception that is not as wrong as it may seem. On level
ground, one rides as fast as is comfortable and because the bicycle is
highly efficient, speed is limited by wind resistance. With a tailwind,
speeding up until the wind is in ones face is fairly easy, and at that
point it becomes a headwind.
  #8  
Old January 27th 11, 03:33 AM posted to rec.bicycles.tech
kolldata
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Posts: 2,836
Default Required DC gearmotor horsepower to push a bicycle?



The one I know of is abt 1.5 HP with the original tiwanese motor/
controller/batt package

http://groups.google.com/groups?hl=e...-8&sa=N&tab=wg

http://www.google.com/webhp?hl=en&sa...1c9d2b3ccf4dd5


  #9  
Old January 27th 11, 03:57 AM posted to rec.bicycles.tech
John Doe
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Posts: 51
Default Required DC gearmotor horsepower to push a bicycle?

kolldata datakoll yahoo.com wrote:

The one I know of is abt 1.5 HP with the original tiwanese motor/
controller/batt package

http://groups.google.com/groups?hl=e...-8&sa=N&tab=wg


The first two results are Google Groups spam.
--




















http://www.google.com/webhp?hl=en&sa...1c9d2b3ccf4dd5




see also Google Groups
Path: news.astraweb.com!border6.newsrouter.astraweb.com! news.glorb.com!news2.glorb.com!postnews.google.com !u13g2000prd.googlegroups.com!not-for-mail
From: kolldata datakoll yahoo.com
Newsgroups: rec.bicycles.tech
Subject: Required DC gearmotor horsepower to push a bicycle?
Date: Wed, 26 Jan 2011 18:33:47 -0800 (PST)
Organization: http://groups.google.com
Lines: 10
Message-ID: 9745a980-bd6e-4148-816d-d16a7e2901f1 u13g2000prd.googlegroups.com
References: 4d3ddba9$0$17014$c3e8da3$92d0a893 news.astraweb.com 4d3de1d9$0$9589$c3e8da3$c8b7d2e6 news.astraweb.com ihkop7$8r7$1 news.eternal-september.org
NNTP-Posting-Host: 71.42.192.98
Mime-Version: 1.0
Content-Type: text/plain; charset=ISO-8859-1
X-Trace: posting.google.com 1296095628 18005 127.0.0.1 (27 Jan 2011 02:33:48 GMT)
X-Complaints-To: groups-abuse google.com
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User-Agent: G2/1.0
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  #10  
Old January 27th 11, 04:49 AM posted to rec.bicycles.tech
kolldata
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Posts: 2,836
Default Required DC gearmotor horsepower to push a bicycle?

I don't read it. It's there, you read it. They are us, no ?

 




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