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Search took 0.01 seconds. Search: Posts Made By: Madact
Forum: The Unicorn Corral 04-15-2015, 10:55 PM
Replies: 140
Views: 24,119
Posted By Madact
Nice find, his list of common HHO lies is quite...

Nice find, his list of common HHO lies is quite good too CR4 - Thread: The Unlucky 13 HHO Lies (http://cr4.globalspec.com/thread/35169) .

Most of the thread is discussion of scammers and...
Forum: The Unicorn Corral 04-14-2015, 11:04 PM
Replies: 140
Views: 24,119
Posted By Madact
Never said they did - I posted that video because...

Never said they did - I posted that video because (a) it has some cool stuff in it, and (b) it shows the kind of complexity that's going on in a combustion process, exposing the sillyness of the "it...
Forum: The Unicorn Corral 04-09-2015, 04:24 AM
Replies: 140
Views: 24,119
Posted By Madact
A very interesting video on work simulating...

A very interesting video on work simulating combustion (in this case, in rocket engines). It focuses mainly on the computing techniques used, but if you take a look from about 41:30 to 42:30, it...
Forum: EcoModding Central 03-23-2015, 02:14 AM
Replies: 19
Views: 10,758
Posted By Madact
Interesting developments: Mercedes-Benz Bionic...

Interesting developments:
Mercedes-Benz Bionic car: Boxfish stability and agility paradox finally solved....
Forum: Aerodynamics 03-10-2015, 10:22 AM
Replies: 4,279
Views: 1,422,343
Posted By Madact
Hudson Super-Six

Saw this beauty recently at a local car show - it's a Hudson Super-Six Coach, the 1948 model I believe. The curves and angles may not have been optimum, but it looks like the intent was certainly...
Forum: Aerodynamics 02-16-2015, 12:38 AM
Replies: 83
Views: 22,007
Posted By Madact
Generally if you must have a small flat object...

Generally if you must have a small flat object sticking into the flow, having it perpendicular to the body (or more specifically, equal angles on each side) is the best case. In the vicinity of the...
Forum: Aerodynamics 01-19-2015, 09:23 AM
Replies: 83
Views: 22,007
Posted By Madact
Good start by the looks of it - what will melt it...

Good start by the looks of it - what will melt it and what won't depends a lot on the kind of plastic it is, definitely test on offcuts / scrap first! Bear in mind that resins & epoxy may also...
Forum: Aerodynamics 01-19-2015, 07:27 AM
Replies: 83
Views: 22,007
Posted By Madact
Actually, you'll notice that the 'stalk' is an...

Actually, you'll notice that the 'stalk' is an airfoil section - plenty of room in there for cable runs. And with a rectangular mirror, you could round off the outside end to allow for a camera...
Forum: Aerodynamics 01-16-2015, 05:39 AM
Replies: 83
Views: 22,007
Posted By Madact
Local laws where I am do allow a passenger car to...

Local laws where I am do allow a passenger car to have only an interior main mirror, but there are also design standards for newer vehicles which are referenced by road-worthiness tests (in other...
Forum: OpenGauge / MPGuino FE computer 01-02-2015, 04:52 AM
Replies: 6
Views: 5,399
Posted By Madact
Very old thread, I know, but just for the benefit...

Very old thread, I know, but just for the benefit of anyone coming across this bit: "!" is a "boolean not", and will return 0 (false) if the operand is non-zero (true), and 1 (true) if the operand...
Forum: Aerodynamics 12-28-2014, 09:22 AM
Replies: 4,279
Views: 1,422,343
Posted By Madact
The article states "two Austin 7hp engines [...]...

The article states "two Austin 7hp engines [...] tuned up till they could do 5,000 rpm".

Guessing that an "Austin 7hp engine" is something the reader was expected to be familiar with, a quick web...
Forum: Aerodynamics 12-20-2014, 08:26 AM
Replies: 4
Views: 2,103
Posted By Madact
Possible DIY alternative to moon discs - "sulky" wheel covers

Scored these today for $10 at a local 2nd hand store, 2 wheels with 2 covers per wheel, plus a spare cover, for a total of 5 (yet another thing to add to my list of...
Forum: Aerodynamics 12-16-2014, 07:23 PM
Replies: 50
Views: 10,528
Posted By Madact
Apologies for the annoyed tone and partial...

Apologies for the annoyed tone and partial off-topic-ness, but

More like a handy approximation of "the shape the air molecules want to follow for optimum return to the place where they were before...
Forum: Aerodynamics 12-14-2014, 10:37 PM
Replies: 50
Views: 10,528
Posted By Madact
Another reference from the "FutureCar" project at...

Another reference from the "FutureCar" project at the University of California, Davis, mentions use of sharp trailing edges and a box cavity (briefly, on page 10) http://www.uctc.net/papers/375.pdf
Forum: Aerodynamics 12-14-2014, 07:27 PM
Replies: 50
Views: 10,528
Posted By Madact
Here we go, another reference for the box cavity...

Here we go, another reference for the box cavity (which has come up in other threads, but also seems relevant here): J.D. Coon and K.D. Visser "Drag Reduction of a Tractor-Trailer Using Planar Boat...
Forum: The Lounge 12-10-2014, 12:20 AM
Replies: 2,496
Views: 570,520
Posted By Madact
Yakky aim if: you work out the shift points you...

Yakky aim if: you work out the shift points you use for normal driving, the shift points for other people's 'normal' driving, and the shift points you'd use for drag racing (if that was a thing you'd...
Forum: EcoModding Central 12-08-2014, 11:22 PM
Replies: 44
Views: 98,236
Posted By Madact
Some more low-viscosity fully synthetics to add...

Some more low-viscosity fully synthetics to add to the list (these two are manual-transmission specific oils compatible with brass & bronze synchros). Info unapologetically copied from data sheets,...
Forum: Aerodynamics 12-04-2014, 02:21 AM
Replies: 50
Views: 10,528
Posted By Madact
Unsure about Cw, but they do indeed seem to be...

Unsure about Cw, but they do indeed seem to be Coanda nozzles. See: Patent DE3837729A1 - Verfahren und vorrichtung zum reduzieren des stroemungswiderstandes im ... - Google Patents...
Forum: Aerodynamics 12-02-2014, 08:00 AM
Replies: 50
Views: 10,528
Posted By Madact
I've always wondered if an airfoil in the...

I've always wondered if an airfoil in the opposite of 'downforce' mode could provide a virtual boat-tail - not enough to cause much extra lift to speak of, mind you, just enough to encourage the wake...
Forum: EcoModding Central 11-24-2014, 09:20 AM
Replies: 100
Views: 27,878
Posted By Madact
OK, so here's the specs for two variants, the...

OK, so here's the specs for two variants, the (sane) "single length 2-step tri-y" and the (questionable) "double length 3-step tri-y".

--- Megaphone Collector Specs ---( Diffuser or Diverging...
Forum: DIY / How-to 11-15-2014, 02:21 AM
Replies: 29
Views: 13,485
Posted By Madact
Before you get too enthusiastic about...

Before you get too enthusiastic about fiberglassing: if you're using polyester fiberglass resin, it will eat the styrofoam.

For bonding to styrofoam you want to be using epoxy resin, and in...
Forum: Aerodynamics 11-11-2014, 07:12 PM
Replies: 4,279
Views: 1,422,343
Posted By Madact
I believe the bubbles are to do with avoiding...

I believe the bubbles are to do with avoiding vortex formation at the roof-door junction, not about headroom... does beg the question "why not just make the whole roof lower?" of course. Would be...
Forum: Aerodynamics 11-11-2014, 02:21 AM
Replies: 4,279
Views: 1,422,343
Posted By Madact
The "Colani 700" (BMW 700 with a body by Luigi...

The "Colani 700" (BMW 700 with a body by Luigi Colani). Prototype built in 1963, monocoque body, 350kg (not sure if that's with an engine in it...), top speed of 200kph, slippery as :)

Very...
Forum: Aerodynamics 11-02-2014, 05:35 PM
Replies: 4,279
Views: 1,422,343
Posted By Madact
TBH I'm not certain it was, originally... it...

TBH I'm not certain it was, originally... it wasn't uncommon for Universities and private teams to help fund their new designs by selling used vehicles to high school teams, who'd then make their own...
Forum: Aerodynamics 11-02-2014, 07:36 AM
Replies: 4,279
Views: 1,422,343
Posted By Madact
Heh, that reminds me... would be almost 20 years...

Heh, that reminds me... would be almost 20 years back, I was in the shell mileage marathon at high school, the senior team was running a car called "glider possum". Displacement somewhere in the...
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