Date: Mon, 17 Nov 2003 22:40:30 -0000
From: "**-**" <>
Subject: Re: Failiure On Track

"Paul Halliday" <> wrote in message > in article bpbhud$1lqikn$, **-** at > wrote on 17/11/2003 22:26: > > > >> When is the "big run"? You said mid-Nov, but we're there now. > > > LOL was aiming for Mid Nov but it might be Early Dec now, Fastest run so far > > is 158mph but the aerodynamics just aren't happening. I'm trying to dial out > > the downforce and just keep it at a minimal downforce/anti-lift setting but > > with no wind tunnel and only a few hours testing available a week its a > > little difficult. My big fear is that as its almost a flat bottom car and I > > can't get any real serious (100kilo+) downforce to push it to the floor if > > it gets the wind under it its not going to be pretty. > > > > That extra 12mph is a bit tricky and its compounded but the relatively huge > > frontal area of the C900. Its there and it will do it its just a matter of > > tweeking everything up right. Got another rolling road session booked for > > Friday where we'll be working on top end boost and hopefully be able to take > > a reliable power reading without it walking off the rollers. > > > > BTW we were down to 4.8mpg from it this weekend. > > Ouch! I though 18 mpg on mine was bad. Have you seen the Pike's Peak NG900 > Viggen? Your old Swedish brick is going to be a real problem cutting through > the air. Once you've got the tuning right on the rolling road, perhaps you > need to build a fibreglass front end spoiler. Well it lost a lot of drag by flatting the bottom off. A spoiler wouldn't really make it anymore aerodynamic, the ones on the Pikes Peakes cars are that big because their racing up hill into thinner air and need to keep the front of the car down as much as possible. By its design a spoiler "spoiles" the flow of air over the vehicle to reduce the pressure build up and kill lift. As it is and current expected power output it should be good for just over 170mph, providing bits and bobs like bonnets and lights are taped up well. Just need to keep everything crossed for a still windless dry day in early Dec now. Matt > Paul >

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