Gas-turbine engines

Jaguar’s scrumptious recent concept, the C-X75, was a celebration of its 75th anniversary, and apart from being rather pleasing to the two forward-facing orbs in our heads, what made it move was also rather cool: four electric engines that could be charged by gas turbines, which in turn can basically run on anything flammable. These sorts of engines are nothing new, and are basically what power jet aircraft through the sky, and their application to cars is older than strapping turbos onto them.

Like GM and the electric car, Chrysler was the company responsible for squandering the opportunity to make something worthwhile regarding gas turbine engines. After development during the 50’s and 60’s, with continual improvements, Chrysler launched 50 prototypes on a 3-year experimental program, which sought to evaluate all the pros and cons of this proposed means of propulsion.

One out of four drivers complained about gas guzzling (they must have been out of peanut oil), and one out of three groused about throttle lag. But there was also plenty of praise, especially about the vibration-free operation and snazzy styling.

Though Chrysler never released one to a journalist, writer John Lawlor managed to drive a Turbine Car toward the end of the consumer test. He, too, was impressed by its smoothness, but annoyed at the relative lack of engine braking — and at the throttle lag, which he reported as the claimed 1.0-1.5 seconds.

His mileage also disappointed — just 11.5 mpg — though he usually ran on cheap kerosene. Lawlor did laud acceleration, which at under 10 seconds to 60 mph was sparkling, especially for a 4,100-pound car. So much for rumors that turbines couldn’t be quick.

Unfortunately, car companies love to trash experimental vehicles en masse when they’re done with them (see GM EV1), with very few surviving examples (one of which now owned by Jay Leno). Development continued into the 70’s and early 80’s, until cuts in federal funding (the Department of Energy was providing Chrysler the lolly to develop the engines) and emissions standards (there was trouble keeping nitrous oxide emissions low) and the ominous spectre of bankruptcy for Chrysler looming on the horizon (that sounds familiar) killed hopes for a production model.

It’s unfortunate things ended when they did. According to one project official, left stillborn was an eighth-generation turbine designed, ironically enough, for Chrysler’s all-important new front-drive K-car compacts and their future derivatives. With a single turbine shaft (versus two), electronic fuel delivery, and a projected 85 horsepower, it would have been the simplest turbine yet, and likely the cheapest to build in quantity.

There were also hopes that a new variable-geometry burner would be the long-sought answer to NOx. But time and money had run out, so this engine went no further than blueprints and a foam mockup.

And since then, the technology has advanced even further. So this begs the question: why is no-one placing their bets on the gas-turbine horse? I suppose it would help to list the various advantages/disadvantages to help the layman (such as myself) see what’s involved:

Advantages of gas turbine engines

  • Very high power-to-weight ratio, compared to reciprocating engines;
  • Smaller than most reciprocating engines of the same power rating.
  • Moves in one direction only, with far less vibration than a reciprocating engine.
  • Fewer moving parts than reciprocating engines.
  • Low operating pressures.
  • High operation speeds.
  • Low lubricating oil cost and consumption.
  • Can run on a wide variety of fuels.

I believe the advantages speak for themselves, so let’s scrutinise the disadvantages and see how could they be overcome:

Disadvantages of gas turbine engines

  • Cost – Nothing mass production wouldn’t take care of. Besides, Mercedes and BMW’s are expensive, and people still buy them.
  • Less efficient than reciprocating engines at idle – Solve it the Jag way, i.e., use it to power electric motors, so instead of having it functioning when stopped at a traffic light, use the electric motors for starting up, and allow the turbine only to kick in while in motion.
  • Longer startup than reciprocating engines – See above.
  • Less responsive to changes in power demand compared to reciprocating engines – Again, use the electric motors for the immediate response.

(taken from here)

There. Problems solved.

No, seriously. There might be some pretty big flaws in my proposed solutions, but I’m convinced these things can be overcome (or could already be solved, had the gas-turbine engine been continually developed). Another serious impediment is that all the copyrights and patents are probably sitting in a Chrysler vault gathering dust somewhere. And I doubt other car manufacturers are willing to spend wads of cash licensing the tech when they already spend zillions in developing their own conventional ICE’s.


Leave a Reply

Fill in your details below or click an icon to log in: Logo

You are commenting using your account. Log Out /  Change )

Google+ photo

You are commenting using your Google+ account. Log Out /  Change )

Twitter picture

You are commenting using your Twitter account. Log Out /  Change )

Facebook photo

You are commenting using your Facebook account. Log Out /  Change )


Connecting to %s

%d bloggers like this: