Search found 22 matches

by zerodish
May 09 2022 6:56pm
Forum: General Discussion
Topic: Lets design a spoke wrench.
Replies: 9
Views: 385

Re: Lets design a spoke wrench.

It looks like 13 gauge spokes use 4 and 5 mm wrenches. That is actually very close to the standard .156 standard so some one needs to do some measurements. Custom builder Ron Boi told me Paramount tandems used 13 gauge spokes but the nipple was 14 gauge sized so it was impossible to true the wheel w...
by zerodish
May 07 2022 6:28am
Forum: EBike General Discussion
Topic: Do 100mph bikes exist??
Replies: 62
Views: 3143

Re: Do 100mph bikes exist??

I have been up to 56 mph on a heavily loaded touring bicycle some where on the Alabama Georgia border. Tour de France riders go faster. One rider had his brake melt so he layed the bike down and skidded to a stop. Tandems are 20 percent faster than singles. The Romp family said they routinely hit 38...
by zerodish
May 07 2022 6:11am
Forum: General Discussion
Topic: Lets design a spoke wrench.
Replies: 9
Views: 385

Re: Lets design a spoke wrench.

I tour. I don’t carry the absolute minimum but just a bit more to help people out. I had the 3 corner and broke every size. Also it hurt to use. REI gave me a full refund. I carry a Park .127 these break also. The round ones never break which means the hole in the center can be larger which means yo...
by zerodish
May 06 2022 7:05pm
Forum: General Discussion
Topic: 3,808,800 RPM, 63,480 RPS, 1338mph, 2153kph, 24.3M G's
Replies: 14
Views: 1645

Re: 3,808,800 RPM, 63,480 RPS, 1338mph, 2153kph, 24.3M G's

Flywheels are designed with the idea hyperbolic shape. This is not only the fastest shape but also the one that stores the most energy. When they come apart they turn to dust. https://grg.org/OneHossShay.htm
by zerodish
May 06 2022 7:01pm
Forum: General Discussion
Topic: gas price thread
Replies: 1597
Views: 95509

Re: gas price thread

A Honda Civic will out perform a 70s Corvette. You can buy Cadillac that will out perform a 70s Lamborghini. These cars are cheaper safer and get better gas milage. That is not enough for some people. They have to have the hot car and the loud car. Then they floor it at every stop light. I for one w...
by zerodish
May 06 2022 6:07pm
Forum: General Discussion
Topic: Lets design a spoke wrench.
Replies: 9
Views: 385

Lets design a spoke wrench.

What I want is the round kind with 8 sizes. These are marked with the gauge sizes and there are a least 2 standards. So lets git of that. Mark them with the inch size and the metric size. I would like a .127 .130 .136 and .156. I don’t know what the 13 gauge standard is but I would like those and on...
by zerodish
Mar 03 2022 8:02am
Forum: Bike Mechanical & Structural
Topic: Thai drag bike tires.
Replies: 26
Views: 1217

Re: Thai drag bike tires.

I get 2500 miles out of a Kevlar belted 1.5 inch tire. Tires fatter than this fail at the sidewall without much warning. I read the motorcycle tire threads here and elsewhere. The narrowest motorcycle tire is 2.75 inches. I want something that will fit in a standard bike frame. You want the largest ...
by zerodish
Feb 27 2022 6:53pm
Forum: Bike Mechanical & Structural
Topic: Thai drag bike tires.
Replies: 26
Views: 1217

Thai drag bike tires.

These showed up on a land speed bike built by Chris Garcia. Information is hard to find but it looks like they are available in 60mm and 80mm width for 17 inch rims. The rims are 1.4 or 1.6 inch wide. This is what I have been looking for something tougher than a bicycle tire but not too wide. I woul...
by zerodish
Dec 17 2021 8:20am
Forum: Bike Mechanical & Structural
Topic: Are these wheels not laced properly?
Replies: 11
Views: 712

Re: Are these wheels not laced properly?

Radial spoking breaks flanges.
by zerodish
Dec 16 2021 7:48am
Forum: Items for Sale - Used
Topic: Tallahassee coop has 27 Veorides
Replies: 0
Views: 414

Tallahassee coop has 27 Veorides

These are the bicycle models with the battery box by the bottom bracket. The batteries are missing and the battery compartments are open. Other than that they seem to be in good shape. They are not going to sell you anything they want you to work for it. It will be quite difficult to become one of t...
by zerodish
Nov 03 2021 4:54pm
Forum: Bike Mechanical & Structural
Topic: My model of spoke breakage.
Replies: 24
Views: 1374

Re: My model of spoke breakage.

Since I started this several interesting things have happened. My last defective DT broke and went into the gears locking them up. I was fortunate I was going slow and was able to pedal to a stop. Spokes must never be allowed to break in the middle. I'm going to repeat this often. I have used DT Alp...
by zerodish
Nov 03 2021 7:47am
Forum: Battery Technology
Topic: Tesla 4680 tabless battery
Replies: 22
Views: 2327

Re: Tesla 4680 tabless battery

I'm sure some one has modeled the heat flow but the patent is more basic than that. By tapping the battery from the side they have shortened the electrical path thus reducing the internal resistance. Also the electrodes are larger so they can handle more current. This can be applied to other chemist...
by zerodish
May 03 2021 7:36am
Forum: Bike Mechanical & Structural
Topic: My model of spoke breakage.
Replies: 24
Views: 1374

Re: My model of spoke breakage.

A rims resistance to spoke pull through is simply proportional to it's thickness. Bontrager figured this out with his BCX series. You have to determine where your spokes are breaking. Most stainless steel spokes break at the elbow. Spokes are made with 2.2 2.3 2.4 2.5 and 2.6mm at the elbow with a 1...
by zerodish
Apr 30 2021 7:31am
Forum: Bike Mechanical & Structural
Topic: My model of spoke breakage.
Replies: 24
Views: 1374

Re: My model of spoke breakage.

I would like to divide the spokes I have broke into 4 catagories. Those that break every 10000 miles. These have an N or a S on the heads. I have broke 7 of those. Those that break every 1000 miles. These have a flat head R on the head which I have been told are an early model Pillar. I have broke a...
by zerodish
Apr 29 2021 6:53am
Forum: Bike Mechanical & Structural
Topic: My model of spoke breakage.
Replies: 24
Views: 1374

Re: My model of spoke breakage.

The equation is LOG(stress)=-.3xLOG(cycles)+4.12+.072xZ The Z is the normal distribution. If you only have 1 spoke you put it in the middle of the normal distribution which divides it into 2 parts. So if you have 36 spokes you divide the normal distribution into 37 parts. Take 1/37 and put it into a...
by zerodish
Apr 28 2021 8:06am
Forum: Bike Mechanical & Structural
Topic: My model of spoke breakage.
Replies: 24
Views: 1374

My model of spoke breakage.

The following numbers are from a theoretical wheel with 36 14 gauge spokes. They are number of miles you can expect for the first 6 broken spokes. 10000 11930 13391 14637 15771 16812 Now you can multiply or divide this set of numbers by any other number and get a realistic wheel. If your first spoke...
by zerodish
Apr 12 2021 7:57am
Forum: Bike Mechanical & Structural
Topic: Square Tubing
Replies: 1
Views: 363

Re: Square Tubing

It's been done. You can find finite element analysis to tubing with holes along the entire length which will be lighter and stronger than an un drilled tube.
by zerodish
Apr 12 2021 7:55am
Forum: Bike Mechanical & Structural
Topic: Tire failure modes.
Replies: 19
Views: 1143

Re: Tire failure modes.

I took a 21 inch motorcycle tire and covered it with ink. Then placed it on a piece of paper to print the contact patch. The contact patch indicated the tire had 37 PSI in it even though there was no air in it. This tire would ride like a tire with 37 PSI in it if you could keep it on the rim. It is...
by zerodish
Apr 08 2021 8:50am
Forum: Bike Mechanical & Structural
Topic: Tire failure modes.
Replies: 19
Views: 1143

Re: Tire failure modes.

The following information is from the Michelin truck tire data book. An 11R22.5 tire has a capacity of 6175 pounds and an 11R24.5 tire has a capacity of 6610 pounds. So a tire's capacity is proportional to it's diameter. Not much but I will take it. A tire's rolling resistance is inversely proportio...
by zerodish
Apr 05 2021 8:47am
Forum: Bike Mechanical & Structural
Topic: Tire failure modes.
Replies: 19
Views: 1143

Tire failure modes.

I'm a touring clydesdale I have done 100000 miles with 165 to 190 pounds on the rear wheel. Kevlar tires last 5 times as long as non Kevlar tires if the failure mode is glass cuts. There are 2 main types of these tires. There is the belt or fabric mesh under the thread used by most makers. There is ...
by zerodish
May 12 2015 8:32pm
Forum: EBike Technical
Topic: Bearings quality
Replies: 38
Views: 4617

Re: Bearings quality

I found a bunch of ceramic Conrad type bearings in the road about 4 years ago. Don't remember the brand other than they were manufactured for a skate board company. They had been run over so I took them apart. I put 44 balls in my loose bearing pedals and have been riding them dry every since. Also ...
by zerodish
Nov 09 2012 9:04am
Forum: EBike Technical
Topic: Going from 36 to 72 spokes on hub motor wheels
Replies: 13
Views: 2039

Re: Going from 36 to 72 spokes on hub motor wheels

The problem with drilling rims is the valve hole is in the way. You could drill just one side the side with the most broken spokes. HiE has done the most weird drillings look for these on the web. Santana built some 16 32 wheels with Phil Wood hubs and custom drilled super champion rims I have been ...