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Thread: Slipstreaming?

  1. #1
    Regular Member parapaul's Avatar
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    Question Slipstreaming?

    Is this just applicable to high speed racing or should the same principle apply in everyday life? The reason I ask is this....

    Coming to work this morning, I was bimbling gently down the M6. Level road, engine temp 85 deg on the gauge, cruise set at 60mph in 6th gear, appox 1500rpm, trip computer showing inst. consumption around 50mpg.

    I was slowly creeping up on an HGV in front of me, and due to a bit of traffic in lane 2 I had to leave it later than I normally would to pull out and overtake. As I got within a few metres of the HGV, and presumably entered his slipstream, my fuel consumption plummeted to around 28mpg. When I pulled out to overtake, it rose quickly back to the same 50mpg.

    I would have thought, if the F1 principle applied, I should have been using LESS power to maintain the same speed because the HGV was acting as a barrier in front of me, and leaving an area of low pressure behind him.

    Any ideas anyone?

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    Regular Member Islander's Avatar
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    Seems like you were driving in the disturbed turbulent air caused by the H.G.V.,
    to get the benefits of slipstreaming you would probably need to be a lot closer,
    driving that close the H.G.V. driver would'nt be able to see you,.........
    NOT recommended !!!!

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    Regular Member AndrewTi's Avatar
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    Guys, Please don't bu99er around with HGV's. It's bad enough having to react to things ahead of you, much less worry about what the bloke in the Vectra behind wants. Plus, if he doesn't see something till too late, where are you going to go?

    If you can't see his mirrors, he can't see you. He'll have seen you coming up behind, then wonder where you are, spending too much time trying to 'find' you, rather than look where He's going.

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    Regular Member parapaul's Avatar
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    Don't get me wrong, it wasn't deliberate, and I wasn't tailgating him or anything like that. It was just something that happened...

    I normally steer well clear of HGVs on the motorway, especially at that time in the morning, the drivers have a tendency not to be at their most alert and however many tons of lorry wandering over the white lines is enough of a deterrent!

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    Regular Member AndrewTi's Avatar
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    Lol! Yep, it can focus the mind somewhat!

    I know you're not daft enough to, but a sudden influx of Vec-traumas showing Vectra's with half a trailer stuck to the front wouldn't be too funny!

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    Regular Member Penfold101's Avatar
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    I wonder how many they went through on Knight Rider before they got the whole 'driving-onto-the-truck' thing right...

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    Regular Member BigMan's Avatar
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    Quote Originally Posted by AndrewTi View Post
    Guys, Please don't bu99er around with HGV's. It's bad enough having to react to things ahead of you, much less worry about what the bloke in the Vectra behind wants. Plus, if he doesn't see something till too late, where are you going to go?

    If you can't see his mirrors, he can't see you. He'll have seen you coming up behind, then wonder where you are, spending too much time trying to 'find' you, rather than look where He's going.
    Well said that man!

  8. #8
    Regular Member Steel's Avatar
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    Vehicle : Vectra

    Trim : Sri

    Engine : Z19DTH

    Year : 2005

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    As I lander said it was probably turbulent air. An HGV makes a big hole in the air so if you were realy close you would have got a slight tow, however given the fact that he was travelling slower than you it wouldn't have helped but it should have raised your mpg due to not having to make your own 'hole in the air'

    The big hole they make is fine but the air has to join back up and because of the size of the hole they make there will be a lot of air rushing in to fill it, this causes turbulence and until you get through it you will feel no slipstram effect at all, in fact, as you experienced, the buffeting of the dirty air has an adverse effect.

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    Regular Member parapaul's Avatar
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    That makes sense, thanks

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