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Old 03-28-2013, 08:50 AM   #571 (permalink)
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Which one are you referring to Sven7?

Edit: the M-1000 appears to be in a French museum?

Here's another car that may have been on this thread before - the 1956 Citroen C10 Coccinelle:




Looking at the drawing again, I think the car was built longer (in the rear in particular) than the drawing shows. The tail is already a bit steep, so the drawing was probably an early sketch. And more fun with packaging and how to best utilize the interior volume. Luckily, the engine on the 2CV is pretty compact and fits under the front seats.

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Old 03-28-2013, 09:28 AM   #572 (permalink)
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Thanks for mentioning 123D Catch - they have an online app, that could be used with these pictures we already have: Autodesk 123D Catch
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Old 03-28-2013, 01:02 PM   #573 (permalink)
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I'm sure the Citroen C10 hasn't been posted before; I'd remember it.

I like the M1000 better. It has to do with the Citroen's 2-part doors, the triangular windshield posts and the questionable nature of the sight lines in the side view drawing. I don't think the driver can see below the horizon to the front.

I looked at the online app. Like the iPhone version they recommend 30+ carefully framed pictures for a good result. I count 11 for the V-S and 8 for the M1000. Even at that, in their tutorial the kid comes out looking like a gorilla.

There may be a forum member that would be local to the museum(s).

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Old 03-28-2013, 03:37 PM   #574 (permalink)
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Neither is faultless - they both have the windshield farther forward than it required for good aero, and neither one has any hint of wheel strakes. Things like pillar locations though can be changed without messing up the overall design, though.

The C10 has the narrowed rear wheel track making it lower drag (since the sides can taper), and it has a longer wheelbase; making it more stable, all else being equal.

Here's my second attempt at modeling Sven7's Linner StrÝmlinet Vogn design, that doesn't have the overly bulbous windshield and kind of splits the difference of the M1000 and the C10 - and doesn't need to be a "cab over" driver's seat:

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Old 03-28-2013, 05:38 PM   #575 (permalink)
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27 views!

You can see the difference with the capture algorithm vs your box modeller. The capture program creates a vast number of equal sized triangles, where (what appears to be) Sketchup makes parsiminous use of NURBs or n-gons. I don't know how you translate one to the other. Are those curved sides faceted or defined by the edge's curve?

Youtube offered me 'Streamline Shape #2' (3 views) It reminds me of my own effort. I see it was upped 2 months ago. I should embellish it a little.
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Old 03-28-2013, 06:27 PM   #576 (permalink)
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Well, maybe you watched a few times because it is up to 28 views now!

This was a direct extrusion of the drawing that Phil Knox gave us:



The colors are bit distracting, but they are from the three profiles that I used to get the basic shape. As you can see, fitting people and a drivetrain inside, and making it driveable is not as simple as you might have thought...

Also, you can see the shape seeming to change - but this is from the "camera lens" changing from a straight-on view to a perspective view. The first 3 key frames are those straight-on views, and it is interesting to see how they would appear in 3D.
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Old 03-30-2013, 12:59 PM   #577 (permalink)
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fins

Quote:
Originally Posted by NeilBlanchard View Post
Every time I see a cool low drag car like the M-1000, the first thought I have is to see if an electric drivetrain would be likely to be used to lower the drag even more. Because they require far less (or almost no) air flow, and they don't have hot exhaust systems. Cooling a hot internal combustion engine with a minimal drag cooling system means that the operating temperatures will be dancing on the edge of reliability.

Also, seeing the chassis for the M-1000 shows the design solution for the use of the interior volume that is pushed forward - the front wheels have to fit under the front doors (which are hinged at the back) and the front suspension is directly under the front seats.

Very often, low drag cars push the engine to the back - where it fits and people do not - and this means that the heaviest part of the car is at just about the worst place in a low drag car; because of the issues of side winds. The rear fenders on the M-1000 may just solve some of this, though?
I think the fins would help with the CG vs CP issue,although being up top,they would introduce a bit of roll moment.When Morelli did the banana car he moved the fins down behind the rear wheels to help kill any chance of that.
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Old 04-10-2013, 10:47 PM   #578 (permalink)
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Hunt housecar - 1937
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Old 04-11-2013, 06:12 PM   #579 (permalink)
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thats what happens when you toss a M 80 into a prius!
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Old 04-18-2013, 07:27 AM   #580 (permalink)
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Random TRANSPORTATION pictures - Page 984 - Pelican Parts Technical BBS

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