Where to buy 12 inch flywheel

Question

Hi, gang!For the ultracapcitor series of bicycles, I am equipping one with mechanicalflywheel.The seat and top tubes are 1 3/8 inch. The down tube is between 1 5/8 and 1 3/4inch.The frame geometery is uncertain but will probably hold a 12 inch flywheel.Where can I buy a spoked cast iron flywheel with 1 1/4 wide and deep circularor rectangular cross section rim, about a two inch hub, and 5/8 bore withkeyway or broached integral key?A machine handwheel just won't do. Not a big enough rim, and not symmetrical.Operation speed is 120 rpm pedaling max, times 48/12 front/rear drive = 480 or500, times 48/8 rear/flywheel, or 3000 rpm. At that speed, if aerodynamic dragis over 5 watts, I need to know and can consider a profiled or built wheel.Needs to be well balanced as supports are 1/8 sheet metal on either side of theframe of the bicycle, against the 1 3/8 tubing. To establish the 1/16 inchclearance I can make the metal thicker. It will be in the form of 14 inchapprox circles, or full width panels.Can anyone estimate the rim weight? I can calculate the energy.Yours,Doug Goncz (at aol dot com)Replikon Research, Seven Corners, VA1100 original posts at:

Grant Erwin · Accepted Answer

Hie thee down to Goodwill and buy a used exercise bike for $29, their standard price for all exercise gear. Most of their stores in the Seattle area have many to choose from since the Nigerians who rob make that work on the loading dock don't want them I mean can't sell them.

Exercise bikes have nice flywheels just about the size you need. Many are even chromed.

Grant

Doug G> Hi, gang!

ERich10983 · Answer

Drive belt pulleys come in many sizes.  Wider ones take parallel belts.Earle RichMont Vernon, NH

Peter Grey · Answer

Isn't this thing going to be pretty heavy?  It'll be a bear to climb with.What about gyroscopic effects of the flywheel?Regards,Peter

Toolie002 · Answer

Sounds like the driven pulley on an air compressor to me.

Doug Goncz · Answer

You guys rock!I think Earle's idea of a multibelt pulley wins.I am currently looking at: "unfinished handwheels" in sizes 12 and 14 inch with 1.3 inch rimthickness. A little hub trimming, and it'll do.My frame sux. I may go with the new frame.Yours,Doug Goncz (at aol dot com)Replikon Research, Seven Corners, VA1100 original posts at:

Mawdeeb · Answer

Doug is this what your looking for?Wheel dia appr. 11.5"rim 1.5" wide and appr. 0.5" thickHub is very thick but bored for a 7/8" shaft no keying.Outer hub dia almost 2.5"If you can use it it is yours for postage. I'm in zip code 34690weighs around 12 poundsJim VrzalHoliday,FLDoug G

Boris Mohar · Answer

For minimum weight use  a small bicycle wheel and wind wire on the rim. Regards,Boris MoharGot Knock? - see:Viatrack Printed Circuit Designs  Ontario

Orrin Iseminger · Answer

SnipI've seen heavy roller chain mounted on a bicycle wheel, too.  Ofcourse, there's not much way to adjust the length of the chain, but ifit's loose a layer of rubber underneath the chain can take up theslack.Orrin

Doug Goncz · Answer

Mawdeeb makes the rain come. On Mars. In Winter.I'll take it!Email to follow.Yours,Doug Goncz (at aol dot com)Replikon Research, Seven Corners, VA1100 original posts at:

Where to buy 12 inch flywheel

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