Effective Height Needed for a Windblocker

snshami · Postby **snshami** » Tue May 03, 2011 8:01 pm

Hi, I have just ordered a sheet of 5mm thick Perspex to make myself a windblocker for my LE NA8. I was planning on attaching it to the twin hoop MX-5 Plus Rollbar I recently installed.

Here is what I am trying to achieve:
- Ease of putting in place and removing it (should not interfere with roof operation in any way)
- Nice appearance (obviously cannot lower the standard of my LE

)
- Effective (so I can drive in cold weather with the roof down and not have my wife ask me to put the roof up

)
- Safe (doesn't have the potential to injure in a crash)

Does anyone have any ideas tips etc.

I am trying to work out a few things. First does it matter how far back it can be. Obviously if I can place it behind the rollbar torque tube then it will be more secure in a crash. Secondly does anyone know what the optimal height is. Has anyone done a study on just how the wind flows into the cabin.

hks_kansei · Postby **hks_kansei** » Tue May 03, 2011 8:08 pm

Maybe trial and error.

Maybe make a few mockups with cardboard and work out the size that works best.

Then of course transfer the final shape to the perspex.

de Bounce · Postby **de Bounce** » Tue May 03, 2011 8:43 pm

About 250mm to 270mm should do!
I have a couple I made however the perspex is to thin, should give you a start
They are the correct width for the MX5 Plus bar
I can bring them to the Garage on Thursday or you can collect.

MX5-SP · Postby **MX5-SP** » Wed May 04, 2011 7:38 am

Here's a previous thread on this very subject:

Custom made perplex wind-blockers between Twin Hoop rollbar

:beer:

Lokiel · Postby **Lokiel** » Wed May 04, 2011 10:14 am

MINX made a nice DIY windblocker for his Twin Hoop Roll Bar: http://mx5cartalk.com/forum/viewtopic.php?f=57&t=32900&start=60

Mr Morlock · Postby **Mr Morlock** » Wed May 04, 2011 10:52 am

The search feature really does work.

snshami · Postby **snshami** » Wed May 04, 2011 6:17 pm

I did a search but found none of the design solutions worked for me even though some of them are very good and clever. I want try and hinge it backwards so it sits flat on the parcel tray, which is why I need to go back to basics and understand how the air flows and how high it needs to be. Obviously if it goes higher than a certain amount it will not fold unless it folds and drops....