Rear Mounted rad n other trickery!

[freebeard]

Originally Posted by kach22i

I have no idea why a PIT Maneuver resistant radiator location would ever be desired outside of a get-a-way car. Planning on robbing banks perhaps? ... Not PIT proof, but Porsche does all sorts of racing that way and still manages to win quite a few races.

I quote PIT maneuver - Wikipedia, the free encyclopedia

The PIT maneuver was adapted from the bump and run technique used in stock car racing, where drivers would bump a competitor to take them out, giving rise to the term, "takeout". This maneuver is illegal in stock car racing because it is very dangerous.

The Porsche is somewhat immune because the the weight is biased to the rear and the maneuver 'pits' the heavy end of one car against the light end of the other.

[kach22i]

Originally Posted by elhigh

Popular Science article that talked about the Probe IV.

MARCH 1983?

MARCH 1983 - Popular SCIENCE - NEW POWERFUL COMPUTERS / FORD'S PROBE IV
March 1983 Popular Science New Powerful Computers Ford's Probe IV | eBay

Page 64 - scroll down.
Popular Science - Google Books

Those radiators look pretty well recessed and protected to me.

Cd of 0.15, not bad at all.

2-1/2 hp to move it along at 50 mph.

[freebeard]

Those radiators look pretty well recessed and protected to me.

OK, I admit it—I was (over)reaching for a point. Not trolling.


I've been thinking about an external oil cooler installed as the trailing edge of a tropfenwagen-style tail. With a perforated shield, like a motorcycle tailpipe. The shield would stand proud of the tail for an inlet and the perfs would be the air outlet.

[elhigh]

Originally Posted by kach22i

MARCH 1983?

MARCH 1983 - Popular SCIENCE - NEW POWERFUL COMPUTERS / FORD'S PROBE IV
March 1983 Popular Science New Powerful Computers Ford's Probe IV | eBay

That's the one. I grew up with my Dad's subscription to Popular Science and found some of the more off-the-wall early 80s concept cars especially fascinating: flywheel drivetrains, early hybrids, aerodynamic concepts. Heady stuff, and I miss that certainty that we would somehow make the world perfect through the determined application of technology. Ah well.

[cRiPpLe_rOoStEr]

Originally Posted by niky

That's why you mount the radiator where nobody (hopefully) will ever hit it...

That might be nice in a demolition-derby, but in a road-legal vehicle that setup would probably give him a hard time dealing with the bureaucrats.

[niky]

There's no legal reason why the radiator has to be up front...

But as to whether you can place it in the passenger cabin... that, I don't know.

[RedDevil]

That's an open car...
Some of those have screens that you can put up behind the headrests so that your hair won't fly in your face (either just the ends flapping about or completely, including the rubber patch it is stiched into)
Why not put the radiator there instead?
Would be stylish, and keep you warm in winter.

[Tesla]

Here's a Lexus concept, don't know if they ever went anywhere with it.
Fourwheelsteer: Motoring Writer: Weird Tech: Lexus rear mounted radiator

Without all the considerations of engineering problems,
Is it aerodynamically advantageous to eject hot air into the wake to reduce drag, this being for both cooling system and exhaust?

I have looked at many of the threads trying to nut out ways to recover heat energy and came to the conclusion that this may actually be the best use for it, throw it into the wake, energise the air there, increase pressure and reduce wake drag.

As for radiator sizing, for most vehicles a couple of small heater (or other) cores would be ample to remove enough heat for 80% of running situations, the main radiator can be kept in normal function as a cold ballast and grill block can be opened for those long trips on hot days.

So really, is there any significant aero benefit possible with this idea to warrant spending the time required to overcome the engineering and design issues?

[freebeard]

The article does nod to mid- and rear-engined cars.

Rear mounted radiators are popular on bobber trucks. Listen to them that do:
Ruffrodders - View Single Post - Rear Mounted Radiators.
long story short:

water line steam pockets ,poor pumping and bad heat control.

[Tesla]

That link talks about the engineering problems to overcome, my question is specifically:
Is there an aero benefit to a rear mounted radiator?
Egineering effective solutions is a stage 2 problem.

For the issues in the link, one could use a secondary cooling system, leaving engine cooling system as is, just adding in a heat exchanger under bonnet to transfer heat to secondary system at rear, if rear system fails, engine system is not affected.