Well done, REA
. What an eye for regulations! Do you work at Ferrari, McLaren or Renault? If you don't, at least you should become a steward.
Well, as bazanaius
states, it's better NOT to have anything that creates eddies than trying to "smooth" them.
I'm not sure about the "whole" point: for example, is not there a way to minimize turbulence behind the car, or to increase pressure at the back, by some kind of "incomplete" diffuser (a section behind each sidepod) or by using something
At least, I think (like the noob I'm in aerodynamics) that the aerodynamic regime of the canister cover has to be similar to golf balls, so, if diffuser won't work, what about dimples on its surface
? Here you have the very basic ideas the forum was able to put together about them, dimples: viewtopic.php?f=6&t=6649
, I didn't know I could violate bastard laws. It sounds to me like an argument for a cheesy black novel...
Anyway, I have the same grasp of the fairing as A13x_f
(both of us are equally insecure about the truth of our statements). I also believe
that any fairing around the canister exit will help to "suck" a larger volumen. I also think that's the general idea behind turbofans: to impulse more air at a lower speed, which gives you more efficiency
I have the confuse notion that it's something like (but different
) the way in which, by increasing the size of propellers and decreasing their rpms you increase greatly the efficiency of ultralight delta wings engines.
Actually, I'm completely sure that in primitive delta wings the tips of the propeller worked at speeds higher than the speed of sound, so, by forcing them to turn at a lower speed (with a gearbox) and by increasing its size, the propeller worked in a more efficient regime, where its tips did not go over the speed of sound.
So, I think the fairing is used in a similar role (larger volume of air impulsed, less speed). Check this slides I googled quickly: the titles in italic point to the relevant part in each slide.
The difference in energy transfer rate...
Low pitch propeller - high performance...
The overall net trust depends in part...
The efficiency can be improved...
Here is the link: http://www.physics.hku.hk/~phys0611/3Te ... flight.pdf
Other relevant phrases in that document: "Propellers have greater efficiency than jets" (thus the idea of the "turbofan" car), "For subsonic aircraft the jet is normally accelerated by means of a simple fixed converging nozzle" (it gives you and idea of the kind of nozzle, if it can be added complying with regulations) and "Wing planform - Elliptical: ideal shape, the lowest drag" (which gives me the idea of elliptical wings for your car, altough if the AoA is zero, I don't know
About the nozzle, I'm happy about the positive dictum of bazanaius
. The problem, as basizeland
states, is that the car has to be made of one piece: how in heaven do you insert the CO2 canister into its cover under that condition? I think
that if the nozzle is separated from the "body" of the cover, the reaction force on the nozzle is greatly diminished.
After reading flyn comment about drag "generated" by lift, I agree with basizeland: the friction of the wheels is probably small (that is, wheels are more efficient for carrying the weight than wings), so I also think
now that the energy savings you would get by getting the car airborne are overwhelmed by the extra drag, as flyn says.
I don't know if the support our forum could give to you will give your team points in the "sponsors acquired" scores, but, please, guys, keep the ideas flowing. Very nice thread, from my point of view. It beats the "scandal" threads on any given day.
I think I'll start reading about the magnus effect on rotating wheels. Isn't that effect what "carries" more air throught the canister fairing (even without a fan, as A13x_f states?).
As usual, I apologize for the length of my postings and the awkward wording... sometimes directly translated from spanish. I know some people don't like 2,000 words posts... the wimps.
: I think flyn is talking about the AoA (Angle of Attack) of the wings. Make them neutral, to create no lift and thus no increase of drag. They are in the car just for the "beauty" of them... flyn says that a "flying car" or a "downforce car" would have larger drag. You know, downforce in F1 comes at the price of a large Cd.