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I think that, in fact, the air drag does push against the front of the box,
but I also think that pressure lightens the front wheel by pushing against
the box...I think that because, one, my manual said so, and two, because
when carrying a passenger the box doesn't get the same amount of air flow
and my Venture never weaved when riding two up.



James Franklin
2411 Pine Summit DR. E
Jacksonville, Florida 32211

808-225-0994 (cell)





From: "Jonhaddock@..."
Reply-To: W650riders@...
To:
Subject: Re: [W650riders] I've Done It (I think)
Date: Fri, 20 Jul 2007 15:12:23 +0100


Top boxes create a low pressure zone behind the rear wheel. They generate
drag, but the high pressure air is pushing against the front of the box and
does little more than slow the bike. Also, top boxes are invariably sitting
in the midst of the turbulence created by the rider. They may well actually
marginally improve aerodynmamics by filling in some of that low pressure
zone.

They do however bugger up the C0G...:-)

.. On the W the low pressure is generated behindf the rider and the rider is
forced back into that zone. Because the rider resists being pulled back, the
force is directed down through his arse onto the seat which squashes the
rear suspension. The pillion fills in that hole and their low pressure zone
develops behind them BUT it isa lot less because rider plus pillion make a
longer more aerodynamic shape.


> My Venture has a warnning attached to the trunk lid, it says do not
exceed
> 85 MPH with luggage attached. The Ws I have owned wander at 120 MPH or
so
> (but didn't with Marcia sitting behind me, so I think it is
aerodynamics).
>
> The top box didn't affect the CB 400 F up to where it leveled off at 100
> MPH, and I rode the Nighthawk 650 up to 100 MPH without a problem with a
> box
> on the back, which doesn't mean that there would not have been a problem,
> had I gone faster.
>
>
>
> James Franklin
> 2411 Pine Summit DR. E
> Jacksonville, Florida 32211
>
> 808-225-0994 (cell)
>
>
>
>
>
> From: "Jonhaddock@..."
> Reply-To: W650riders@...
> To:
> Subject: Re: [W650riders] I've Done It (I think)
> Date: Thu, 19 Jul 2007 23:50:58 +0100
>
>
> You won't get one. The Police one's weave for the same reason the W
> does...Big coppers punch a big hole in the air and create a BIG low
> pressure
> zone. The cops are scratching their heads because their Pans are fitted
> with
> up-rated load adjusting shocks but they'll still sometimes but not always
> weaving at high speed. They've cottoned on to the extra weight thing, but
> not the torso size of the rider. They haven't yet spotted that its the
big
> chested burly officers that are getting the problems.....
>
> Think I should tell 'em?
>
> Jon
>
>
>
>
> I took it up to speeds in excess of the normal motorway speeds and no
> weave at all. however mine will have the top box fitted so I will find
out
> if that has an adverse effect
> Dick
> ----- Original Message -----
> From: Jonhaddock@...
> To: W650riders@...
> Sent: Thursday, July 19, 2007 8:20 PM
> Subject: Re: [W650riders] I've Done It (I think)
>
>
>
> Cool!
>
> Now you can get embroiled in the famous copper killing weave
debates
> that are consuming all the Pan riders at the moment.
>
> I spoke to a Pan riding copper last month and I'm pretty sure its
> the
> same as the W weave!
>
>
> As some of you will know recently I have been considering a more
> touring style of appliance. Today I rode tested a ST1300 Pan European. I
> was
> offered a really good trade in for my CB1300S against a brand new Pan
> complete with a package off accessories worth 850 for less than the list
> price of a standard bike.
> Hopefully I will be concluding the deal next week
> Dick
>
>
>
>
>
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