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Old 06-30-2008, 10:06 AM   #11 (permalink)
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i had an idea to get a more powerfull radiator fan and hook it to a tube like the air tube on a laundry dryer and put the end of it under the car, under or just past the dash board, to reduce drag. the tube from the dryer looks like an ok size tube to use, big enough to for large ammounts of air to pass thru and flexible enough to easilly route in the right direction,
by taking the hot radiator air and pushing it under the dash under the car, you stop it from ending up stuck under the hood like a parachute, also
it blows the hot air back onto to engine and by rerouting it under that stuff, the engine will end up running cooler without its own heat being sucked out and blown right back in its face, this could cause trouble if the hot air was to cause a fire under the vehicle or heat the gas tank, so, the air can be re routed all the way to the rear end by the mufler.
i think they use this to reduce drag in airplanes where the jet engine is in the back, it sucks air from the front to burn which reduces drag.
the idea is to counter the drag by manipulating the air flows, possibly to the extent that the drag is canceled out, its eazier and cheaper have a fan move the air for your car than for your car's front end to move the air

im not saying i think cars should have aero lift in them, but, it is about time that we had flying cars.
my car can go 200 miles on a tank an airplane can fly across the world, but, now even that number is not where it should be with all the rediculas engeneering flaws these things have. but we know the point is that the car can get better fuel economy and so can an airplane.

i had an idea to put an adjustable spoiler to add intense downforce during turns and add lift when accelerating, this could be worked into the gas pedal, when you hit the gas, it removes all downforce and maybe adds a bit of lift, when you take the foot off the gas, it pulls the spoiler back to heavy downforce mode for turning.... this wont work with the "hybrids", prius or with regenerative braking

i think that by trying to cancel the drag you could easily get +20% mpg

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Old 06-30-2008, 10:17 AM   #12 (permalink)
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some interesting ideas. i think some bmw have a duct behind the radiator that takes the radiator air out along a smooth path, some racecars also do think trough vents in the hood.

as for the lift-downforce spoiler... lift is generally not very good in cars... yes it virtually makes the car lighter, but the first effect of this is loss of traction... my car fequently spins its front wheels in the wet, when you have to merg into a bussy street from standstill...it's never excessive but under these situations you want some grip as well for safety.

perhaps lift can work for dedicated hypermilers but in general it will make a car unsafe.
(and once you's ok with removeing some safety a light 80's style car without airbags and side impact beems will save more weight than the lift would compensate for)

so personally i'm not to fond of the idea. the theory is good, but there's side effects you don't want... perhaps it could have some use on tracked vehicles like trains..
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Old 06-30-2008, 11:02 AM   #13 (permalink)
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I like the active grill block ideas. I thought of a similar setup but using a spring and electromagnet for simplicity.

Re: flying cars - I know people who can't walk in a straight line, and I see a lot of drivers who can't handle traveling in 3 dimensions, let alone adding in a 4th; and let's not get into the care and maintenance of these vehicles. I'm rather happy that we don't have 85 year old cataract and arthritis patients going around in missiles. I'd much prefer to see less travel being necessary than giving people a much more efficient way to kill themselves.
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Old 07-01-2008, 12:29 PM   #14 (permalink)
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Active grille blocks have existed on big rigs for a while -- ever notice the venetian-blind-like things moving out front?

A Walkman or computer fan motor will be way too weak for this purpose. I'd suggest finding a gearmotor or contacting a local robot hobby group to get some of their castoffs. In fact, they'd probably find the project intriguing and would help with the fabrication and control scheme.

Check out All Electronics for a good selection.

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Old 07-01-2008, 09:08 PM   #15 (permalink)
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holyPaulie : I see youv'e posted to this forum too. ( and Gasavers )
I was hoping you would.
I think it's a fantastic idea.
The more people we can get to pitch in ideas like this the better.

Wizardwizard : I didn't read all of your post...but... it's really longwinded.

Maybe shorten it next time and ...stay on topic ?
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Old 10-05-2008, 01:36 AM   #16 (permalink)
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Originally Posted by Shawn D. View Post
Active grille blocks have existed on big rigs for a while -- ever notice the venetian-blind-like things moving out front.

I want a smaller one for my rig. I'm hoping to start modding my pickup this spring and have wanted to do a grill block. However, since I'm often moving 1/2 ton+ around I need some kind of manual override for opening the whole thing up when needed (Oregon if anything is hilly). I was thinking of giving up on grill blocks for me to begin with...perhaps a trip to freightliner is in order.
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Old 10-13-2008, 01:17 AM   #17 (permalink)
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Heat actuated flaps

VW beetles and most of the air cooled VWs have a small bi-metal bellows which by way of a pushrod, open the flaps under the fan shroud. I kept a spare one for years hoping to use it somewhere. That could be set up for this kind of use with a long pushrod.

BTW VW beetles have no front grille but use belted fan to cool the engine. Tell that to anyone worried about grille blocks.
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Old 10-13-2008, 09:31 AM   #18 (permalink)
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OT: I love how the pic in the OP has changed to lumber. Sure makes a fine grill-block, but I don't know how active it will be

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