Resources

[Miles]

List of RC motors with specifications: http://www.progressiverc.com/Brushless_Motor.html

Motor calculators:
http://www.drivecalc.de/
http://www.micronradiocontrol.co.uk/scorpion_calc.html

Power calculators:
viewtopic.php?f=2&t=6892&p=287797#p287797
http://endless-sphere.com/forums/viewto ... 55#p312555

Gear-ratio/speed calculators
RWP's calculator: viewtopic.php?p=250222#p250222
See attachment for calculator by johnrobholmes.

[Fumesucker]

Another motor calculator and motor parameter database.

http://www.peakeff.com/

Edited to add: This calculator also has an option for calculating motor parameters from input data.. You will need to know the no load current draw and also rpm, current draw and voltage for the motor with two different loads on it.. Seven measurements all together. Two different propellers will work just fine.

[Miles]

Free MCAD software:
http://www.plm.automation.siemens.com/e ... tudent.cfm

Free 2D CAD:
http://www.progecad.com/compra/index.as ... 1&lang=eng
http://www.plm.automation.siemens.com/e ... ndex.shtml
http://www.3ds.com/products/draftsight/ ... -overview/

[Miles]

Brushless motor primer:
http://www.gobrushless.com/kb/index.php?title=Main_Page

[boostjuice]

I found this very interesting document while surfing the net.
FULLY ENCLOSED FRAME MOUNTED GEARBOX FOR DOWNHILL MOUNTAIN BIKES
http://iris.lib.neu.edu/getblob?blobid=1098686411726934

[oofnik]

Very nice design document there, boostjuice. Beefy engineering details, just the way I like it.

[boostjuice]

I found this very interesting document while surfing the net.
FULLY ENCLOSED FRAME MOUNTED GEARBOX FOR DOWNHILL MOUNTAIN BIKES
http://iris.lib.neu.edu/getblob?blobid=1098686411726934

Hi,

It would be a lot more interesting if the standard specified an auxiliary input.

You must consider that the Downhill mountain bike market is huge in comparison with the e-bike market. Like alot of other bicycle components/DC motors ES members use, using one would require adaption to a powered input, a task much simpler than designing and building one of those gearboxes from scratch. In that sense it has alot of value as a document that stimulates ideas rather than point out an off the shelf complete product.

The most interesting parts of that document are not the one-off prototype box being made by the university research group, but the quick analysis of the Suntour V-boxx and other designs that utilise a nexus style inernal hub into the bicycle frame. It shows how extra variable gear reduction can be achieved at the front chainring area which free's up more room for a wider more powerful/more available rear hub motor, or simply gives extra gear range for a BB drive system. Something desperately lacking in the e-bike world currently.

[Jason]

I was searching for some 3d software the other day and stumbled upon this. It may be one of the easiest 3d creation tools I've ever used http://sketchup.google.com/

[TylerDurden]

Sketchup is slick, but IIRC, the free version doesn't output files everybody can play with.

I use Blender (which ain't CAD), because I prefer the scene/texture/animation process. If I ever get off my butt, I'll learn CAD and import the objects into blender for the other stuff.

[ron van sommeren]

Two lists of motormanufacturers, motortypes etc. Both compiled by Louis Fourdan at RCGroups. No tests.

http://Electrofly.free.fr
-> telechargement
-> moteurs
-> Outrunners EXCEL data base and/or -> Inrunners EXCEL data base

Vriendelijke groeten Ron

[Miles]

Technical information on synchronous belt drives:

[Miles]

Pulley Resources:
http://www.endless-sphere.com/forums/viewtopic.php?f=28&t=8491

[Miles]

Sturmey Archer catalogue 2009/2010

[Miles]

Research papers on motor development:
http://www.eme.ee.kth.se/research.php

[Miles]

Freewheel crank resources thread:
http://www.endless-sphere.com/forums/viewtopic.php?f=28&t=7641


Summary/compilation of Freewheel crank resources thread by Mitch Ji:

Basically, there are two options (well three, counting the Cyclone crankset...).

One is that you use a high-end trials-type front freewheel cranksset, which is basically
nothing more than a high quality White Industries ENO freewheel with special crank arms
that screw into the FW threads. What they typically do is have a fixed 12T cog on the rear
hub, and an 18T FW at the crank. Anyway, what we are doing is using a 22T ENO FW, with
the trials crankarms, and then make an adapter that bolts to the 22T FW and then has a
standard 110mm BCD mountain bike chain ring pattern, so that we can have lots of chainring
choices to achieve the right gearing.

The second option for getting a freewheel into the crankset, is to use a IPS crankset from
some tandem bike setups. This is used sometimes, to allow the second rider on a tandem to
not have to pedal. Again the IPS crankset is nothing more than crankarms that screw into
a regular freewheel, which is attached to a standard 110mm BCD spider. the nice thing about
this setup is that you don't have to make the adapter, but the downside is that like the
Cyclone crankset, they use cheap 16T freewheels. The solution for both, however, is to
replace the cheap FW with an $80 ENO version.

So, you screw your freewheel onto the trials cranks and then you need an adapter to mate up with one of the three common chainring BCD standards. 104mm 110mm and 130mm. For my bike, I designed a chainring to fit directly to the ENO 22t freewheel (see photo).


The ENO 22t is a particularly convenient one to adapt because it has 5 circumferentially milled slots which can be used to bolt to:

After Gary and Miles posted that information Sick Bikes Introduced a White FW that is the same mechanically but more convenient to use and less expensive than the Eno 22t.

Sick Bike Parts also sells:
1. A FW removal tool ($5.95 - a bargain) which works with both their less expensive FW and White FW's.
2. The Cyclone FW cranks which are much less expensive than Echo (the quality is probably proportionate).

http://sickbikeparts.com/catalog/product_info.php?cPath=21&products_id=62

Super heavy duty front freewheel made exclusively for Sick Bike Parts by White Industries.
Price: $64.95

http://sickbikeparts.com/catalog/product_info.php?cPath=21&products_id=35

170mm crank set for front freewheel system. Forged alloy for use with square taper spindle.
Price: $30.50

http://sickbikeparts.com/catalog/product_info.php?cPath=23&products_id=64

Freewheel removal tool for both our standard and HD freewheels.
Price: $5.95

http://www.webcyclery.com/product.php?productid=16644&cat=415&page=1

This is the forged (less expensive) Echo Front Freewheel crankset - the black one. It's available in ISIS or square taper.
Price: $100.00

http://www.webcyclery.com/product.php?productid=17459&cat=415&page=1

A CNC'd ISIS trials crank from Echo in 160mm (mod) and 170mm (stock) lengths.

The CNC crank from Echo is machined from 7075 aluminum. ISIS Spline and 160mm and 170mm lengths. It accepts a front freewheel or fixed cogs (Thread 1.37"X24T).

Another good source of FW Cranks (link provide by Miles):
http://midwestbiketrials.com/store/index.php?main_page=index&cPath=2_11

http://www.bikepartsusa.com/bikeparts/item/01-98475/crank-tandem/Vision%2D%2DIndependent%2DPeddeling%2DSystem%2C%2DRear%2C%2DFor%2DTandems%2C%2D175mm&category=crank-tandem

Vision Independent Peddeling System, Crank, Rear, For Tandems, 175mm
Price:$119.98

http://www.hostelshoppe.com/cgi-bin/readitem.pl?Accessory=1098307215

Sun Bicycles - Independent Pedaling System Crankset
Price: $162.00 - 180.00

FW crank with multiple chain rings:

http://www.bike-elektro-antrieb.ch/home.htm

His prices are high but most of the parts are off the shelf.
Motor using 44t plus 44t+32t+22t chain rings:

[Miles]

Summary/compilation of Freewheel crank resources thread by Mitch Ji:
Continued....

Pictures of a Nice FW/BCD 130mm Adaptor:
http://www.endless-sphere.com/forums/viewtopic.php?f=28&t=7641&start=285#p159585

Step by step instructions in modifying a "Big Cheese 110m Chainwheel Adaptor" to fit a White Eno 22t FW. (The same method would work with the Sickbikes White FW):
http://www.endless-sphere.com/forums/viewtopic.php?f=6&t=1757&start=45
The Big Cheese Adaptor is here:
http://www.ebikestop.com/big_cheese_110mm_5_arm_chainwheel_adapter-CR7298.php

Caveat and options:
viewtopic.php?f=28&t=21248&start=0

[spinningmagnets]

From Matt (Recumpence). Allows any wheel with the 6-hole ISO disc brake flange to accept 130mm Bolt-Center-Diameter (BCD) chainrings.

38T to 72T sprockets currently known to be available off-the-shelf (custom orders up to 100T). After building a left-side-drive using a chain to the wheel, this adapter allows you to easily change the tooth-count with common chainrings.

http://endless-sphere.com/forums/viewtopic.php?f=28&t=11690

[recumpence]

Here's a link to the throttle building tutorial..........

viewtopic.php?f=28&t=12196&start=0

Matt

[Miles]

Standard fixings:

Shimano 9 spline - de facto standard for freehub drivers (except Campagnolo)

1.37" x 24 tpi thread standard freewheel thread

30mm x 1mm BMX freewheel thread

3 spline standard hub gear sprocket fixing

44mm BCD 6 bolt ISO disk brake rotor standard

104mm BCD; 110 BCD; 130 BCD; common chainring standards

[MitchJi]

Hi,

Bicycle Drive Calculators:
When using the Sheldon Brown Calculators the MPH @ various RPM's are handy feature in the Gear units pulldowns.
Sheldon Brown's Internal Gear Calculator:
http://www.sheldonbrown.com/gears/internal.html

Sheldon Browns Calculator for derailleurs:
http://www.sheldonbrown.com/gears/index.html

If you want more numbers, including speed and cadence data,
Jake Odell has a more elaborate gear calculator:
HPV Drivetrain Analyzer

http://www.soulbikes.com/gears/

Welcome to the HPV Drivetrain Analyzer. With this program, you can see what the metrics are for the drivetrain on your hpv (bike, trike, etc), if it uses chain coupled sprockets with an optional shaft coupled pair of sprocketsets between the crank and the road. Schlumpf Mountain-Drive, Speed-Drive, and High-Speed-Drive crank ratios are available modifiers in sprocketset #1. Three hub styles are accommodated, a single ratio or direct hub, a hub with up to 15 distinct ratios like the SRAM Spectro, and the Rohloff SpeedHub that has symmetrical ratios.

Math is done in floating point, which means that you can enter fractional numbers for the tooth count. This way you can, for instance, integrate the two Schlumpf ranges into one output display by entering the Schlumpf ratio times each of the chainrings on the crank. For an example of this technique, see the Schlumpf/Rohloff sample config.

There are five optional output tables:
1. A Cadence table showing speed data in miles/hour and kilometers/hour for a selectable range of crank rpm's,
2. a recap of the Input Data,
3. a table of Hub Ratios if the configuration has a ratio other than 1:1,
4. a Split Table showing tooth splits and percent change for shifts among sprockets in each sprocketset,
5. and a Gear Metrics table of gear permutations sorted by the output to input ratio. This table has several optional columns.

Preset Configurations
At the top of the input panel, there is a selector that will preset the inputs with known or typical configurations, which immediately display output when changed. One of the selections is 'My Configuration'. In this selection...

[MitchJi]

Hi,

Nice Velo Vision Review/Comparison from March 2008 of Nuvinci, Rohloff, Nexus Alfine 8 and SRAM iMotion 9 Geared Hubs:

There’s a common link between the bikes we’ve reviewed so far this issue: they all use internal hub gears – and not just any hub gears, but the newest and latest from Shimano, Rohloff and NuVinci. As I’d also fitted the new SRAM 9-speed to my town bike, the stage was set for a four-way shoot-out.

http://www.velovision.com/mag/issue29/vv29hubgears.pdf

[spinningmagnets]

Adapter for $25 that allows a large motor-sprocket to be attached to a common rear-axle right-side 16T freewheel of an internally-geared hub. Has OD threads to accept a second freewheel For the independent pedal-drive.

These large sprockets are available from several gasoline motor-bike kit suppliers and Kart sites, but are typically mounted with a solid connection to the rear wheel, often on the left-side which eliminates a disc brake option.

A solid mount would force either your manual pedalling to drive the motor (causing extra drag), or, a freewheel must be attached to the small motor sprocket, which would limit how small the motor-cog could be. 16T freewheels are available, but when using a solid motor-cog, you can go as small as 9T. (If your motor does not freewheel, you may want a 16T freewheel for the motor-cog)

If you wish to use this adapter with chainrings instead of a large-diameter Kart sprocket, you can add the Dimension "big-cheese" adapter with the center drilled out by a 2-1/8" hole-saw, as seen here:

viewtopic.php?f=28&t=8035&start=15#p195172



When used on an internally-geared hub (Nexus/SRAM/Sturmey-Archer) the motor is able to the use the internal gearset. This can help top speed without requiring an increase in system voltage, and also increases hill-climbing ability while generating much less motor heat.

Allows a free-wheeling motor-chain drive to the rear axle, while also allowing a stock left-side disc brake.

Prototype is a Sturmey-Archer 3-speed that works well, other makes/models and gear-counts (3-sp up to 8-sp) being investigated. Prototype thread here: viewtopic.php?f=28&t=8035

http://www.tppacks.com/proddetail.asp?prod=EBKE-y-FWAdapter

[spinningmagnets]

$16 kit to swap a one-piece Beach-Cruiser/BMX-style crank (with large-diameter bearings) to a "small bearing" 3-piece square-shank Bottom-Bracket (BB) drive. The square shank-BB is needed to install the front-BB freewheels described earlier in the resources thread, and many "Cruiser style" bike frames still use the one-piece crank.

http://www.bikeworldusa.us/category/1495260281/1/Bottom-Bracket.htm

A similar kit from "Sick Bike Parts"
http://sickbikeparts.com/catalog/product_info.php?cPath=23&products_id=56

[MitchJi]

Hi,

I created this thread in the E-Bike Technical Forum. I think the information is useful enough that a link and brief summary in the Resources thread is worthwhile.

NOTE: There are more articles in the thread than I mention here and more on the original site than in that thread.

Links and Information - A lot of High Quality DIY Info

http://endless-sphere.com/forums/viewtopic.php?f=2&t=13281

Partial List:
At least 3 very Sophisticated DIY Suspended Trike Builds. The latest version is a folding Trike with air suspension! (7 part article).

DIY Skidpan Testing (how to compare Automobiles and Trikes).


Building an Ultra Light-Weight Car, Part 1

Foam Fairings, Part 1 (of 3)

Bike LED Lighting Power! - Modifying LED lights for massively improved performance

For a Trike:
Building a High Performance LED Lighting System, Part 3
Flashing high power LEDs - and installing a complete lighting system...

Beginners' Guide to Welding, Part 1

They are also modest :
Zero Cost Modelling of Space-Frames
A brilliant way of developing and testing space-frame structures

Complete Guide to Composites, Part 5

Real World Measurement of Drag and Lift
Down to earth aero testing techniques

[spinningmagnets]

$40 adapter allows you to attach a 74mm-BCD chainring onto a splined freehub. This includes the SRAM "Dual-Drive" which combines a 3-speed internally-geared hub with several external derailleur gears on a splined reciever.

24T to 32T known to be available off the shelf (custom large tooth-counts available from various bike machine shops).

DG's custom bicycle machining, S. E. Iowa, Central USA
http://dgcustommachining.blogspot.com/

Hostel-shoppe chainrings
http://www.hostelshoppe.com/cgi-bin/readitem.pl?Accessory=1175033036

Parallel-drive thread discussing potential benefits
viewtopic.php?f=28&t=12449