As some one pointed out before, wind resistance varies as the square of velocity (with a constant drag coefficient). Smoothing out air flow over and under the body will make the biggest differences at higher speeds. Splitter trays keep under body flows as laminar as possible. A smooth underbody cover ala NSX coupe? also helps.
If your bonnet is lifting at speed, this is an indication you need to something about limiting high speed air flow through your radiator and getting a good front spoiler design with splitter tray. Rolling resistance is overcome with higher tyre pressures on large diameter wheels and skinny tyres (supertourer style) and perfect as possible alignment to minimise tyre deformation. My 2 cents worth Cheers, Feral Errol <http://www.datrats.com.au/> -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] Behalf Of Zac Campbell Sent: Friday, February 28, 2003 11:49 PM To: [EMAIL PROTECTED] Subject: Re: Top speed of modified P510? I don't think it is just a matter of playing with wings. I would rather do something about the under car aerodynamics too, namely a front spoiler to decrease the amount of air passing under the car aswell as some sideskirts and a diffuser to smooth the air exit. All this in the name of decreasing lift, lift being part of what causes the floating at high speeds. Then see if you need some drag increasing wings. ----- Original Message ----- From: "David Andrews" <[EMAIL PROTECTED]> To: <[EMAIL PROTECTED]> Sent: Friday, February 28, 2003 10:38 PM Subject: Re: Top speed of modified P510? > Dunno about that. Have a look at the mega-fast 9-sec gtr's from japan > (HPI/Zoom etc), they all tend towards long low-incident-angle wings. Your > required angle decreases as air flow increases. Thus the faster you want > to go the smaller angle you need. Of course, up until the point you > approach that speed you have minimal downforce so unstability. The > answer? Adjustable wings. Ala the F1 McLaren. For those who haven't seen > it, have a squiz at the following movie: > > http://www.netspace.net.au/~thehelix112/Top_Gear-McLarenF1.asf > > in a little while after I've finished uploading it. Impressive stuff. > > I'm of the opinion that top speed in any car is limited by two things > (assuming STP standard temperature pressure). Torque at the wheels at > desired speed, and drag coefficient. With torque is a product of the > engines torque at the required RPM and the driveline ratios. > > Oh and andrew, do you have a measured time from brett's speed day run by > any chance? > Thanks, > > Dave > > > > >>>>>>>>>>>>>>>>>> Original Message <<<<<<<<<<<<<<<<<< > > On 2/28/03, 4:48:44 PM, "Rob P" <[EMAIL PROTECTED]> wrote regarding Re: > Top speed of modified P510?: > > > > You'd have to start thinking about some seriously huge rear wing for > > downforce after that. > > Then that's going to add drag and slow you down etc.... > > > Rob P > > ----- Original Message ----- > > From: "dceptn" <[EMAIL PROTECTED]> > > To: <[EMAIL PROTECTED]> > > Sent: Friday, February 28, 2003 10:12 AM > > Subject: Re: Top speed of modified P510? > > > > > hmm that 9sec 1600 cracks around 211kmhr > > > > > > ----- Original Message ----- > > > From: "Rob P" <[EMAIL PROTECTED]> > > > To: <[EMAIL PROTECTED]> > > > Sent: Friday, February 28, 2003 2:23 PM > > > Subject: Top speed of modified P510? > > > > > > > > > > I seem to recall that air resistance increases in a logarithmic fashion > > as > > > > speed increases, hence the limiting of top speed. e.g. air > > > > resistance/friction at 200km/h is more than twice it would be at > > 100km/h. > > > > So you need a pretty slippery car body shape and LOTS of power to get to > > > > 300km/h plus. > > > > > > > > Q: What is the highest top speed anyone has ever heard a Datsun 1600 > > going > > > > at? Forget about the stock motor, I mean Turboed, Nitroed, Supercharged > > > > whatever? I guess it would be pretty difficult to crack much more than > > > > 230km/h with that body shape. > > > > > > > > Rob P > > > > > > > > > > > > ----- Original Message ----- > > > > From: "Jon Ovington" <[EMAIL PROTECTED]> > > > > To: <[EMAIL PROTECTED]> > > > > Sent: Thursday, February 27, 2003 8:15 PM > > > > Subject: RE: A very powful tool > > > > > > > > > > > > > Down hill with big wind assistance, and BLOODY BIG run up... Bit of > > luck > > > > > and maybe you'll get there =) > > > > > > > > > > Seriously, its a lot to ask for. As Heath said, its all about > > friction, > > > > > just because it has a 7k redline, does not mean it will get there in > > top > > > > > gear. > > > > > > > > > > Modified, yeah understand its very possible, stock, doubt it. > > > > > > > > > > My opinion anyhow ;) > > > > > > > > > > I guess the way to prove it is try it! Pinout 53 I believe. > > > > > > > > > > > > > > > Regards, > > > > > Jon Ovington > > > > > > > > > > DatNet - Online Nissan-Datsun Resource > > > > > Website: http://www.datnet.org > > > > > Contact Us at [EMAIL PROTECTED] > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > -----Original Message----- > > > > > From: [EMAIL PROTECTED] > > > > > [mailto:[EMAIL PROTECTED] On Behalf Of Heath > > > > > Sent: Thursday, 27 February 2003 10:44 PM > > > > > To: [EMAIL PROTECTED] > > > > > Subject: Re: A very powful tool > > > > > > > > > > > > > > > on salt lakes? > > > > > > > > > > Heath > > > > > ----- Original Message ----- > > > > > From: Maldat <[EMAIL PROTECTED]> > > > > > To: <[EMAIL PROTECTED]> > > > > > Sent: Thursday, February 27, 2003 5:27 PM > > > > > Subject: Re: A very powful tool > > > > > > > > > > > > > > > > you carnt judge anything on a full blown race car,they dont run a > > 3.5 > > > > > > diff for a start let alone a auto trans. totally different. > > > > > > > > > > > > The nissan race car with this basic engine has turbos of course and > > > > > > different efi but they are doing around 400+Kph, > > > > > > > > > > > > remember its a factory street car it will need a wind up but I'm > > keen > > > > > > to > > > > > see > > > > > > 7000 in top. > > > > > > > > > > > > Malcolm > > > > > > > > > > > > > > > > > > > > > > > > > > > --membersozdat------------------------------------------------------- OZDAT Mailing List Please Note:- Send (un)subscribe requests to [EMAIL PROTECTED] Send submissions to [EMAIL PROTECTED] No unauthorised redistribution of this email http://www.ozdat.com/ozdatonline/index.htm http://www.ozdat.com/ozdatonline/listindex.html http://www.mail-archive.com/[EMAIL PROTECTED]/ ---------------------------------------------------------------------
