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Old 01-09-2013, 05:01 PM   #491 (permalink)
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Thanks - it's the Hip point?

I don't think the H-point could be a whole lot lower - the Trev is a battery powered vehicle and the floor is where the battery pack needs to be, for the lowest Cg possible. The top of the canopy (made by a sail plane builder - can you tell?) is probably just over 4' high - and its the apex on a very sleek dome. Improving the Cd by 0.01 would be much more meaningful.



That looks like a 14" Honda rim to me? If so, the tire would be about 2' and the apex of the canopy would be about 4'-3" above the ground.

Here's a photo with three people (one short, one average, one tall):


Here it is with some school age kids:




These people are bent over to look in, and they are still taller than the car:

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Old 01-09-2013, 07:07 PM   #492 (permalink)
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So you move the batteries a bit to get your butt lower! Get your butt lower, lower the roofline, reduce frontal area by 1/4 sq ft. Of course I was not involved in designing or building the car so I don't know the constraints. Playing armchair car designer is fun, though.

It could easily be a bit longer- as we know, length can be good for aero as well. They are Civic HX wheels, the same kind I'm buying for Ren.
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Old 01-09-2013, 07:21 PM   #493 (permalink)
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It needs front skirts.
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Old 01-09-2013, 07:25 PM   #494 (permalink)
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NeilBlanchard -- Those are great posts. I knew of both cars, but you've provided more on them than I'd seen elsewhere. Thanks. Any specs on the wheelbase, track, &etc.?

How does the Urbee's 3D printed body panels make you feel?

The Trev appears to have a canopy that both alligators from the rear bulkhead and hinges down the right side. Am I not getting something? Maybe the 'problem' isn't the H-point so much as those 14" wheels.

In General Efficiency I started a thread on recreating the Messerschmitt Kabinenroller. I pointed to the articles on Autospeed that were based on the Trev. I like Julian Edgars' writing. For reference they are
Issue: 543/Section: Technical Features /11 August, 2009/Cardboard Cars?
Issue: 516 /Section: DIY Tech Features/3 February, 2009/Building an Ultra Light-Weight Car, Part 1
Issue: 517/Section: DIY Tech Features/10 February, 2009/Building an Ultra Light-Weight Car, Part 2
Issue: 521/Section: Technical Features/10 March, 2009/Custom Bubble Canopies
But I encourage you to visit that thread.

Does anyone have a way to scrape all 50 pages into a .pdf file? More specifically, Has any one posted the VW Nils?

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Old 01-09-2013, 09:23 PM   #495 (permalink)
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The rear hinge is the earlier iteration. The current one is binged on the side - and it has a wiper that pivots at the leading edge of the canopy. I've inquired about dimensions and specs and 3D model, etc. They don't intend to produce it (they are volunteers at a university in Adelaide?)but they do have a couple of construction articles that I linked to on the Team Trev thread and they hope people will built it or vehicles like it.

I think it could be improved aerodynamically (in addition to skirting the front wheels): the sides need to slightly convex, and the shoulder needs to angle down rather than up.
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Old 01-09-2013, 10:41 PM   #496 (permalink)
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Quote:
Originally Posted by Sven7 View Post
They "disabled" the drivetrains. All I know is there is a bunch of charging paraphernalia in the trunk. Perhaps with a little messing around I could get a peek under the hood
I went and saw that car many times while I was in High School!

I bet y'all are soooo jealous of me :-p 56K BEWARE!

I've also vacationed in Stillwater, MN oddly enough....... did you come all the way out here just for CCS?
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Old 01-10-2013, 02:45 PM   #497 (permalink)
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Quote:
Originally Posted by NeilBlanchard View Post
The Urbee has (at least) two very interesting features: rear wheel steering (hence no need to hinge the front wheel skirts)...
There's a reason that rear-wheel steering is pretty much unheard of in an automotive application. The handling would be diabolical...

-soD
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Old 01-10-2013, 02:59 PM   #498 (permalink)
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They may have come up with some geometry to account for this? I posted a link to a discussion on the Urbee thread.
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Old 01-10-2013, 08:01 PM   #499 (permalink)
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I wonder if this still classifies as a car, it has been converted for use on railway tracks, but just look at those aeromods of 1950's!
https://secure.flickr.com/photos/mrs...esclassiccars/

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Old 01-10-2013, 09:34 PM   #500 (permalink)
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Low rolling resistance too!

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