So you are looking to generate good downforce with the least possible drag....no? All you have to do in your case is to work towards destroying/reversing lift as efficiently as possible. Embrace this useful tool -> http://www.xflr5.com/xflr5.htm. It's mostly used by hobbyists but it allows you to create aerofoil geometries and does a damn good job with simulations. I used to school myself with it a while back when i wanted to make model ACs, then time became scarce. I still have my stash of tuts on it but be warned..there is a steep learning curve involved! But with adequate will, it doesn't matter how many aeronautics classes you missed. Your objective should be still within reach. _______________________________________________ *In programming, as in everything else, to be in error is to be reborn.** * _______________________________________________ * * 2012/9/30 TheMburu George <themburu@gmail.com>
@Peter tell me when you get one or we seek a simulator, I wouldnt mind offering my physics on this one given I also want to add some thrust in my small car more like rocket propulsion, code name #TheMatrix
./TheMburu
On Sun, Sep 30, 2012 at 11:22 AM, Areba Collins [ @BrainiacKE ® ] < arebacollins@gmail.com> wrote:
seriously @joe! a PROBOX manages to wriggle its way into a serius discussion as this?
On Sun, Sep 30, 2012 at 3:29 AM, joe mwirigi <joemwirigi@gmail.com>wrote:
@peter since your needs are theoritical, instead of having a life-size wind tunnel, just venture into the miniature world. show for well-scale skilled toys and play around with them.
The drag- and their cousins are found in fluid mechanics or say fluid dynamics. some of the stuff you learn in high school called bernoullis effect. Then buy test kits that are availble online or devise your own. Create test scenarios and your hypothesis. e.g what are the effects of a spoiler (in an ideal environment. where air-flow is constant without pressure differences) (1) Does it increase the downward force of a car creating stability with speed? - Control expmt, have your miniature probox cruise thro the tunnel at speed x and have sensors on the tunnel floor calculate the average force exerted - add a spoiler to the miniature probox and have it do same speed and get your results.
To stick a claim to your findings, repeat the same experiment only 1000 times and get the averages and draw the graphs.
(2) repeat the above with different air flows and speeds and voila! scale your results to a life size probox and compare your results to those of boeng and the rest. Worth of note is that there are spoilers that acually spoil the aerodynamics meant to be achieved
I think am off topic here but at the end of day, life-size wind tunnels may require on to have big shares in some monopolies here
regds
*_______________________________________________________________ We must Keep on, *
On Sat, Sep 29, 2012 at 9:54 PM, Areba Collins [ @BrainiacKE ® ] < arebacollins@gmail.com> wrote:
@peter, If you missed some lessons in aerodymanics, I missed two years at the end... (had enough).. :-) anyway, your answers inline...
On Sat, Sep 29, 2012 at 5:35 PM, Peter Karunyu <pkarunyu@gmail.com>wrote:
Well, my theoretical needs are not as complicated...
Given a choice of spoilers, I would want to know factually, which one will have less drag at the rear, I forget what they call that phenomenon which happens at the rear of a car without a spoiler.
DRAG, every moving body has it, its just a matter of how much.. there are fancy equations to derive what works best.
So, I was thinking that, the most simplistic one would be a pipe huge enough to fit a small car, then cut out a section of it and affix see through plexiglass or something, then fit a big fan on one side of the pipe, with a tiny pipe which releases coloured particles, so that one can see the airflow.
Id cut the wheel reinvention and look at formular 1 cars spoilers, and how they work. Wont be too far when doing the design. In fact, spoilers in formula 1 help in both braking, traction and steering, much like the tail of a cheetar, or the ailerons on an aircraft while landing and taking off...
@Steve, is this not a good enough need? It really doesn't have to be way complicated.
Plus I missed all the lessons on aerodynamics
On 9/28/12, Mark Mwangi <mwangy@gmail.com> wrote:
How large are the wind tunnels in question? Enough to fit a boeing Dreamliner or a tiny model plane?
On Fri, Sep 28, 2012 at 9:03 PM, Areba Collins [ @BrainiacKE ® ] < arebacollins@gmail.com> wrote:
> I totally understand the misunderstanding william, Many people actually > associate wind turbines to aeronautical designs and by their very nature, > aeroplanes are generally not small creatures. Fortunately, for third > world > countries like we, the need for advanced wind turbines hardly justifies > the > costs considering the priorities we have. Technology such as i mentioned > before however gives us a good opportunity to leapfrog the technological > advantage by enabling even the poorest of design houses to make solid > design decisions... > > > On Fri, Sep 28, 2012 at 8:48 PM, William Muriithi < > william.muriithi@gmail.com> wrote: > >> Areba, >> >> > >> > @william quite on the contrary, there are hundreds if not thousands of >> wind >> > tunnels in the states, Any engineering university worth its name, and >> with >> > an effective R & D program needs at least a wind tunnel, and its not >> > as >> > rocket sciency as it seems. Just a big fan and lots of sensors, and a >> smoke >> > signal for the kicks. Without a wind tunnel, performance cars, boats, >> wind >> > turbines, aeroplanes and many other moving parts cannot be designed to >> > effective performance. >> Opps, yes I google and I was totally wrong. There is a number of >> tunnels in USA, the biggest one being NASA. >> >> That being said, I can explain my misunderstanding. I tend to read a >> lot about airplane manufacturing and remembered reading that Boeing >> does some of their wind tunnel test in Europe. That is actually >> correct. The dreamliner (787) and 777 had part of their wind tunnel >> in Europe (Check wikipedia and a bit of google). So there is clearly >> something lacking in the USA tunnels >> >> William >> >> > >> > Onto answering you., How about you describe what you intend to >> > achieve, >> > Maybe software like Pro Engineer and simulation based apps may be able >> to >> > give at least theoretical performance data enough to burn a few grand >> doing >> > the concepts for real world testing... ama? >> > >> > On Fri, Sep 28, 2012 at 7:00 PM, William Muriithi < >> > william.muriithi@gmail.com> wrote: >> > >> >> > >> >> > Good people, >> >> > Might there be a "wind tunnel" somewhere in .ke? >> >> > >> >> Very expensive. Even USA shut down their wind tunnel. Boeing does >> >> their wind tunnel test in Europe now. The fact a country with an >> >> air-plane manufacturing sector could not keep their tunnel going just >> >> tell you how unlikely most of the other countries would entertain >> >> such >> >> an idea >> >> >> >> William >> >> > By wind tunnel I mean a device with which one can test the >> aerodynamic >> >> > properties of body kits, spoilers, splitters, diffusers etc on >> cars... >> >> >