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Old 02-25-2011, 10:47 AM   #11 (permalink)
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I'd build a Tandem reverse tadpole vehicle.... like the HyperRocket.



However, instead of a 250cc parallel twin Ninja 250 motor, mine would have a 100-150cc fuel injected single cylinder 4 stroke engine with a small turbocharger and a 5-6 speed transmission. I'd also make fairings for the front wheels.

Also you could extend the chassis a bit as to accommodate 2 passengers (3 total seats), or more.

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Old 02-25-2011, 11:35 AM   #12 (permalink)
sjr
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Quote:
Originally Posted by darcane View Post
Your only goal is efficiency?

Go low.

Cars are built high for practical reasons. Comfort, visibilty, safety.

Land speed racing has many ties to fuel efficiency. The better streamlined your car is, the less power you need to go a certain speed. In land speed racing, this translates to higher speeds with less power. For fuel efficiency, this means less fuel at the speed you drive.

One of the most innovative cars in racing is a series of cars called the Nebulous Theorem. They are built with nearly no ground clearance and extremely minimal frontal area. The NebII has set records at 360mph with a turbo 1.5L engine. (About 700hp). Power needed to overcome aero drag cubed is proportional to speed. So, if you assume 700hp to overcome drag at 360mph, only 3hp is needed at 60mph.

Pics can be found here:
Worlds Fastest 4 Cylinder Nebulous Theorem II


ok thats cool I wont need to go over 70 mph, mostly 50 and under




so Im hearing different choices from you guys, some high some low , i can go either, so whats the pros and cons of each? I see both on the net, remember Im only going 50 mph 15 miles round trip to work
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Old 02-25-2011, 01:00 PM   #13 (permalink)
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First thing to consider is where you're going to be driving. What are the roads like? From an overall efficiency standpoint, improved aero doesn't help much if you frequently scrape the belly pan on the pavement. (Don't laugh: I was seriously worried about getting the Insight high-centered on stretches of I-80 over the Sierra, where heavy truck traffic &c had worn ruts into the concrete.)

That's one of the reasons I like an Aptera-like design, with a smooth belly well clear of the road.
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Old 02-25-2011, 01:03 PM   #14 (permalink)
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Quote:
Originally Posted by sjr View Post
...remember Im only going 50 mph 15 miles round trip to work
Only 15 miles RT? Forget the car and get a bike. If you want to be super-efficient, get a recumbent with fairing. Then you can add electric assist...
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Old 02-25-2011, 06:14 PM   #15 (permalink)
sjr
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Quote:
Originally Posted by jamesqf View Post
Only 15 miles RT? Forget the car and get a bike. If you want to be super-efficient, get a recumbent with fairing. Then you can add electric assist...
no.... I like a enclosed heated box, and a bike wouldnt compete with the trucks and cars on the road, I need to go the speed limit
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Old 02-26-2011, 01:54 AM   #16 (permalink)
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Low also gives you visibility issues. Both having a hard time seeing around traffic and roadside obstacles, and the latte-chugging soccer mom who can't see you while she is on the phone while applying make-up in her lifted Expedition...

Low also gives less weight transfer under acceleration, braking, and cornering. In general, that will make for better handling.

-soD

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