[Healeys] BN7 Sidescreens - Screen Fitting Instructions

Fri Oct 22 12:52:25 MDT 2021

Bill--

I have never met Mr. Bernouli and when I said that pressure inside the car
"increased" it would indeed have been more accurate to say that pressure
outside decreased due to the air molecules' having to travel a greater
distance, creating lift..  Fortunately the magnets' force is stronger than
the lift and my side curtains no longer pop out at highway speeds.

On Fri, Oct 22, 2021 at 1:29 PM WILLIAM B LAWRENCE <ynotink at msn.com> wrote:

> Actually the effect you are seeing is the Bernoulli effect. The air
> outside is moving faster than the air inside, which lowers the pressure
> outside causing the screens to move out. It’s the same thing that allows
> airplanes to fly and sailboats to sail into the wind. The 100 doesn’t have
> a channel to hold the front of the screen so I made a couple tabs of strap
> ally and mounted them under the top hold down screws. Worked fine until my
> Moss side curtains fell apart. Got them in waiting until I get a new set...
> ------------------------------
> *From:* Healeys <healeys-bounces at autox.team.net> on behalf of Michael
> Oritt via Healeys <healeys at autox.team.net>
> *Sent:* Friday, October 22, 2021 2:54 AM
> *To:* Jean Caron <vintage_roadster_restoration at hotmail.com>
> *Cc:* Norman Hendry <Norman.Hendry at shaw.ca>; healeys at autox.team.net <
> healeys at autox.team.net>
> *Subject:* Re: [Healeys] BN7 Sidescreens - Screen Fitting Instructions
>
> I believe that side curtains on roadsters have a tendency to blow out due
> to increased pressure within the car, especially at speed.  Mounting and
> fitting the curtains perfectly so that they notch in behind the windshield
> stantions just enough to resist this force is not easy and I came up an
> easy solution:  I mounted a 1" square neodymium magnet to the front inside
> upper corner of each curtain and a similar magnet to the rear face of
> each stantion using a small piece of angle in such a way that they are in
> their "attraction" mode when the door is closed.  The magnets are more than
> powerful enough to overcome the pressure from within the car and yet they
> release when the door is opened.
>
> I forget now my source but the magnets can be ordered with holes
> predrilled in their center and they are chrome-plated.
>
> Best--Michael Oritt, BN1
>
> On Thu, Oct 21, 2021 at 8:31 PM Jean Caron via Healeys <
> healeys at autox.team.net> wrote:
>
> Norman,
>
> I usually buy my own felt, a fairly thin and dense one, and cut my own
> glass and make sure it fits rather tight, then you have to “pinch” the
> glass in the channel at the top and bottom by tapping the divider against
> the glass where it ends.
>
>
>
> Jean
>
>
>
> Sent from Mail <https://go.microsoft.com/fwlink/?LinkId=550986> for
> Windows
>
>
>
> *From: *Norman Hendry via Healeys <healeys at autox.team.net>
> *Sent: *October 21, 2021 2:49 PM
> *To: *healeys at autox.team.net
> *Subject: *[Healeys] BN7 Sidescreens - Screen Fitting Instructions
>
>
>
> Went for a drive the other day and as it was rather windy I fitted my new
> side screens for the first time and was impressed with the wind and noise
> protection they gave. Part of the drive took me onto a highway and when I
> increased the speed to 100 km/h the fixed screen on the drivers door blew
> out (thankfully there were no other cars around me)
>
>
>
> Taking a closer look at the side screen frame and comparing it to the
> original side screen assemblies I noticed the following:
>
> 1. The siding screen is in the inner channel which has a felt U-section –
> same as the originals
>
> 2. The outer channel, for the fixed screen is filled all-around with a
> high density felt which is just below the channel lip.  Is this right, as
> the felt blocks the drainage holes, the screen does not sit deep in the the
> channel, and the original side screens do not have this felt?
>
>
>
> I have spent countless hours surfing the net, the archives, looking at
> parts books, and Gary Andersons restoration guidelines and can’t find how
> the screens are fitted inside the frame so I would be really appreciative
> of help and guidance.
>
>
>
> Thank you
>
>
>
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> --
> Best--Michael
>

-- 
Best--Michael
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