Things you should know...... - Saab General Bulletin Board - Saabnet.com
The banner above is an advertisment - if it asks you to download software, please ignore.
Site News -
5/28: SAAB Evolutions/TSN T-Shirts $14 |
5/23: SOC Day Pass Winners Announceed
[General |
Members |
C900 |
9000 |
NG900 & OG93 |
93 |
95 |
NG95 |
99 |
Sonett |
Vintage Models |
Clubs |
Other Cars |
FAQs |
Gifts |
Member Photo Galleries |
Member Directory |
Classifieds |
Manuals |
*Buddy Registry |
*Mileage Registry |
Polls |
What's New |
Raffle |
Photo of the Month |
Sponsors]
[Main General Bulletin Board | BBFAQ |
Prev by Date | Next by Date | Post Followup ]
Member Login / Signup - Members see fewer ads. - Latest Member Gallery Photos
Things you should know......
Posted by Herb H [Email] (more from Herb H) on Wed, 14 Nov 2007 08:31:00
In Reply to: Re: OT chain sprocket size formula, Gargoyle, Wed, 14 Nov 2007 05:46:21
Members do not see ads below this line. - Help Keep This Site Online - Signup
Gargoyle did some good work, and I'd like to carry it a step further.
I checked my bike and determined the following:
1. The smallest sprocket has 14 teeth.
2. That sprocket had a spacing of .5" between teeth.
Based upon the above this means that:
1. You'll need a sprocket with 994 teeth.
2. This 994 tooth sprocket will have a circumference of 1,988 inches or 165.66 feet. Expressed another way this 994 tooth sprocket will have a diameter of 52.7 feet, far greater than the 14 inch tire you're planning to use.
In conclusion:
To accomplish a 71:1 reduction ratio on a bicycle you'll need to use an approach other than a chain and 2 sprockets. You might look into a way of having the motor engage the outer periphery of the wheel.
Here are some preliminary facts that would apply to an approach wherein a motor spinning at 1750 RPM and a 71:1 ratio were applied.
1. 14 inch diameter wheel woul have a circumference of 44 inches.
2. A 71:1 ratio could be accomplished with a motor having a shaft with a .62 inch circumference which would be a diameter of .2 inches, a little less than 1/4 of an inch.
3. This setup would travel at the speed of 1 MPH.
4. If you wanted a speed of 20 MPH the motor could have a shaft with a diameter of 3.95 inches.
posted by 205.188.11...
Posts in this Thread:
Members do not see ads below this line. - Help Keep This Site Online - Signup
Post a Followup
No Site Registration is Required to Post - Site Membership is optional (Member Features List), but helps to keep the site online
for all Saabers. If the site helps you, please consider helping the site by becoming a member.
StateOfNine.com
|
SaabClub.com
|
Jak Stoll Performance
|
M Car Covers
|
Ad Available
|
Random Saabnet.com Member Gallery Photos (Click Image)
This is a moderated bulletin board - Posting is a privilege, not a right.
Unsolicited commercial postings are not allowed (no spam). Please, no For Sale or Wanted postings, SERIOUSLY.
Classifieds are to be listed in The Saab Network Classifieds pages.
This is a problem solving forum for over 250,000 Saab owners, so expect to see
problems discussed here even though our cars are generally very reliable. This is not an anything goes
type of forum. Saabnet.com has been a moderated forum since 1988. For usage guidelines, see the
Saabnet.com Mission and Purpose Page. Please remember that you are
not anonymous. Site Contact | Site Donations | Other Sites by SP -
Poverty2Prosperity.org | Run Club Menlo Park | ScreenBot
Site Members do not see red text instructions, bottom of the page anchor ads, or box ads.
Click here to see all
the Site Membership Benefits!