Blue Origin Rocket Flight – Credit: Blue Origin
You might have heard about a secretive space flight effort in the wilds of Texas that sustained an unfortunate crash recently. That was the “Blue Origin” project. (http://www.blueorigin.com/)
The flight was aborted by “a flight instability” as the team called it. That, in my opinion, is a Texas sized understatement.
I’m not going to call the crash an accident, because such a crash was completely predictable just from taking a quick glance at its design. And of course they didn’t intend for it to crash, its probably just that they didn’t quite understand some fundamental rocket flight dynamics.
(c) Copyright 2011 David Dilworth
“Science is organized common sense where many a beautiful theory was killed by an ugly fact.” -Thomas Henry Huxley
Formula 1 Ferrari Inside Tyre Unloaded
When Elden Racing Cars owner Brian Hampsheir hired me as Designer-Engineer to recapture their glorious former racing car fortunes, I received the opportunity to interview their previous designer. He provided lots of good engineering history and perspective, but he claimed as fact one jaw-droppingly false physics/engineering idea.
He did not understand weight transfer for race cars. In fact he had it backwards. He believed that the more weight transfer side-to-side – the faster a car could corner. I believe he even bragged that Elden’s Formula cars were narrower than all of our competitors.
Posted in Dynamics, Education, Engineering, Physics, Racing, Simple Solutions Ignored, Vehicles
Tagged Casey Stoner, David Dilworth, dynamic center of gravity, Elden Racing, Laguna Seca, Long wheelbase, MotoGP, nose stand, Overturning Moment, racing bikes, Stoppie, Weight Transfer, wheelie
(c) Copyright 2018 David Dilworth
“Smart”car – Not
I relish puzzles. My parents gave me books of them when I turned five, to keep me occupied while we drove cross-country. As they told it – I’d finished them all by the second day.
However, I’m not at all fond of puzzles when starting a car (though I might put up with some inconvenience for a Ferrari). I’m happy to leave those puzzles to Sherlock Holmes, Mensa, or anyone else. Which brings us to the so-called “Smart”car.
There are a lot of pleasant benefits with a “Smart”car. They are darn cute, lots of people smile and wave when they see it – kind of like driving with a happy puppy hanging out the window. Indeed, they are so short I really have (legally) parked it straight in to a tiny parking spot – rather than parallel to a roadway. Also the cars get good, though not amazing, gas mileage, and (if you like this sort of thing) it feels like driving a Go-Kart, particularly over undulating, curvy roads. Continue reading
This morning I was astounded and then annoyed to read a leading manufacturer and designer of competitive oars – get the fundamental reason, the fluid dynamic reason, oars work – entirely wrong — to the detriment of the field.
Fluid dynamics can seem slightly difficult to understand, but with good explanations it can easily make sense. (The field is daunting to many due to the excessive use of math required to take courses barring entry to this priesthood. So lets see how well I can convey some math-free principles here.)
In any case, the unsigned article strongly, and wrongly, claims that oar blades operate using “lift” as though they work like aircraft wings.
No. The truth is that in competitive rowing, oar blades operate almost wholly as a drag devices, like a traditional circular parachute, employing drag only – not at all like flying wings. (This is not true for all oars. Some oars not used for competitive rowing, such as Gondola oars, do use lift to a small degree.) Continue reading
Cornering Wheelie – Hayden at Laguna Seca 2011
(c) Copyright 2013 David Dilworth
Gyroscopic effects are one of the few physics principles that are not intuitive to me. I’ve studied them and used them for decades, yet when I spin a bicycle wheel holding it by the axle I’m still never quite certain which way the gyroscopic effects will torque the wheel – until I test it with my own hands and see which ways things move.
This is a brief overview of the three separate gyroscopic effects that affect bikes (that I wrote in part to help me remember). It does not deal with other very important bike dynamics including the several Polar Moments of Intertia (roll, yaw, pitch) that come into play when a bike is conducting a turn.
I’ve used an example of a bike turning left so this should make more sense than a page of equations or having you wade chest-deep through ambidextrous physics jargon. If I get enough encouragement I may try to make some diagrams for us all.
1. HandleBar / Gyroscopic Steer-Lean Effect: gyroscopic effect created by a steering maneuver when the front wheel is rotating.
We’ll start with some basic bike dynamics and examine the gyroscopic effects independently of each other.
A ten-fold leap in stored energy density has been realized in a University of Illinois lab.
The team claims the batteries should be ten times smaller for the same power storage and they can be recharged 1,000 times faster than existing batteries.
They do this with fabrication at the molecular level using Styrofoam beads as micromolds, depositing metal on the beads and afterwards dissolving away the beads.
“Super-powered battery breakthrough claimed by US team”
Imagine what you can do with those.
High-power lithium ion microbatteries from interdigitated three-dimensional bicontinuous nanoporous electrodes
Posted in Physics
Vestas Sailrocket 2 setting new World Sailing Speed Record Credit: Vestas Team
(November 18, 2012: Namibia, Africa) Vestas Sailrocket 2 piloted by project leader Paul Larsen traveled at more than 55.32 knots (exceeding 60 mph and 100 kph) over a nautical mile course on Walvis Bay. For a few moments during the run the boat exceeded 70 mph (112 kph) relative to the water surface. The two records are not yet official while pending verification.
Problem (in 1991) : Oil Fires generating tons of thick oil smoke every minute, polluting the Himalayas thousands of miles away.
Team: Dilworth Design rapidly assembled a team of 25 volunteer scientists and engineers to provide solutions. The team diagnosed the problems, mapped out a solution and came up with about a dozen ideas. This dozen soon distilled down to a single idea – Concrete Pencils.
Great article on tracking crashed aircraft in Air and Space magazine November 2011 issue “Lost in America.“
The article describes several types of Emergency Locator Transmitter (ELT) technology used to help alert family and officials that a plane has crashed, and to help rescuers find the downed plane.
It explains the old official system (operating at 121.5 mhz), a newer official system (406 mhz) and a fascinating new system with a very different improved and proven concept.
Best Road Track Corner Driver Ever ?
by David Dilworth
Who is the Best Corner Driver ?
In my decades of involvement in the car racing world, including teaching race car driving at Winfield’s Racing School at Goodwood in England, I’ve had the opportunity to carefully observe many hundreds, perhaps thousands, of the world’s best drivers navigate road track corners: Formula 1 drivers, Can-Am drivers, USAC, CART, etc. With a few exceptions, if they raced on a road course since the 1970s – I’ve probably carefully observed their corner driving skills. From the Andrettis to Zanardi; from Jackie Stewart to Jacques Villeneuve.
I still smile in amazement at how one man’s skill in driving corners still stands so clearly above the rest. His driving was aesthetically magnificent. Fast, smooth, graceful, yes, even elegant. The way he drove a corner was a genuine dynamic masterpiece.
And I’ll be shocked if you can guess who I’m talking about.
Preventing Oil-Tanker Spills With Aircraft Technology (c) Copyright 1990-2005 David Dilworth
Exxon Valdez Oil SpillCredit: USGS
This is a concept for an inexpensive, but not free, lunch. Converting proven technology can dramatically reduce the serious harms from oil tanker spills and their fires and lower the cost of oil and gasoline by reducing the cost of oil shipping insurance. Continue reading
Very Quick Electric Racing Bike
A couple of weeks ago I saw electric racing motorcycles at Laguna Seca. I was shocked (sorry) at how quick they were. In the medium speed section of the course, a few bikes were approaching the speed of the fastest MotoGP bikes. Based on my experience with electric racing vehicles, I predict they will very soon be the quickest bikes on the track, especially if they adopt longer wheelbases first.
However, at last year’s Laguna Seca electric bike race, just like in auto racing when you run out of gas, the leading bike ran out of electric “juice” on the last lap – losing out on victory.
So far most engineers and the press believe electric cars are stuck with long recharging time for batteries.
That’s a colossal failure of imagination.
What do we do when digital camera batteries fail – do we wait for it to recharge?
Here are two articles on landmark research explaining how we mis-understood two static physics phenomena prior to 2011: Static Friction and Static Electricity.
Static Friction DemonstrationCredit: UnderstandingForce.com
1. Static Friction
“How Earthquakes Can Be Predicted: Researchers Reveal New Means” http://www.sciencedaily.com/releases/2010/11/101130100524.htm
These researchers found the coefficient of friction can vary by five-fold when measured at molecular size. They also found three very different kinds of stick-slip friction: below, at and above the speed of sound.
There are three alarming things observed at Fukoshima, that aren’t getting much US media attention: Blue Flashes, 13 separate Neutron emission detections and radioactive Chlorine.
Do you understand the nuclear radioactivity levels resulting from the Japanese nuclear plant crisis?
Can you figure out how much radioactivity is dangerous?
This article explains the three major ways radioactivity is measured, to help you compare the numbers reported by the media – so you can make up your own mind whether the amount of radioactive material leakage is dangerous.
Mainstream news stories almost always confuse radiation and radioactive (materials), which are significantly different things.
only affects things locally, very locally. While
can spread in the air and water and emit ionizing radiation all the way around the world.
Here are two examples of correct and wrong usage:
“Nothing in this world can take the place of Persistence.
“Talent will not;
nothing is more common than unsuccessful people with talent.
“Genius will not;
unrewarded genius is almost a proverb.
“Education will not;
the world is full of educated derelicts.
“Persistence and determination alone are omnipotent.”
That idea comes to us courtesy of former US President Calvin Coolidge. Here’s a version I first used in the 1970s :
“Persistence is the most powerful tool known to womankind”
-David Dilworth, 1979
Go get em.