Front Spoilers for P6?

I would be interested to know what the coefficient of drag (Cd) is for the Rover in standard kit, with the P6 spoilers, and with the Old Auto Rubber Company front spoiler. Here is an interesting piece written by professional engineer Roopinder Tara.
engineering.com - Turbulence - What a Drag It Is When You Drive

It is fascinating stuff. The Navier-Stokes equations that frame fluid flow (air is also a fluid within an engineering and mathematical context) were formulated by a French mechanical engineer Claude-Louis Navier (1785 - 1836) and mathematician + physicist Sir George Gabriel Stokes (1819 - 1903). The Navier Stokes equations are a set of partial differential equations in either 2 or 3 dimensions that are exceptionally difficult to solve, so they normally use what are called Reynolds averaged Navier-Stokes equations.

Ron.
 
cobraboy said:
Maybe one of these on the window ?
Window Scoop A - ACW Motorsport Plastics, Polycarbonate Windows

Pics of the Jag would be cool !
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That was our first thought too. The laminar flow means the first 100mm of air near the surface of the car is hot. So a scoop would make it even worse. I’m thinking something in the exit surface in the bonnet plus a couple of small fins to create turbulence at the edge of the exit surface might drop things a little without major consequences to airflow for the car as a whole. Believe it or not the owner got a chance to ask Peter Stevens if he thought it was an ok solution and we got his blessing (still on a high about that!).
Terrible pics of car for you. The powder on the window was for my scanner.
 

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That is quite a big unusual shaped opening. I was suggesting fitting that window scoop with a rearward opening, so the bubble shot the hot air over the hole.
Baffles in the bonnet vents may as you say direct the air away from the side of the screen.
 
SydneyRoverP6B said:
I would be interested to know what the coefficient of drag (Cd) is for the Rover in standard kit, with the P6 spoilers, and with the Old Auto Rubber Company front spoiler. Here is an interesting piece written by professional engineer Roopinder Tara.
engineering.com - Turbulence - What a Drag It Is When You Drive

It is fascinating stuff. The Navier-Stokes equations that frame fluid flow (air is also a fluid within an engineering and mathematical context) were formulated by a French mechanical engineer Claude-Louis Navier (1785 - 1836) and mathematician + physicist Sir George Gabriel Stokes (1819 - 1903). The Navier Stokes equations are a set of partial differential equations in either 2 or 3 dimensions that are exceptionally difficult to solve, so they normally use what are called Reynolds averaged Navier-Stokes equations.

Ron.
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A good read. Something as non slippery as a P6 would give their computer a serious work out.
 
cobraboy said:
That is quite a big unusual shaped opening. I was suggesting fitting that window scoop with a rearward opening, so the bubble shot the hot air over the hole.
Baffles in the bonnet vents may as you say direct the air away from the side of the screen.
Click to expand...

issue then is negative pressure in cabin drawing air in from air box (another heat related problem, apparently even the period drivers had major heat issues). The owner has a cool shirt he wears for racing but would like to use the car on the road occasionally. It’s a fun problem.
 
I really like the twin long NADA bonnet scoops on the pale blue car in Mike's post (#60), but I'm not really a fan of that front air dam from Scotts. I really like the treatment Mal Clark gave his orange car in Cobraboy's post (#52), with the exception of the flaring lip around the bottom edge. Looking at the temporary tape job, I think perhaps he has cut off the lower portion of the front wings, and incorporated that shape into his new fibreglass front valance? I wonder if that silver painted bumper might well also be a fibreglass piece, as the bumper irons look to have been replaced with a different mounting?
As for the aerodynamic advantage of all these various spoilers, I wouldn't have a clue. I think the little stubby 'Police' spoilers go a long way to helping with the sort of 'chinless' look of the P6, which normally shows so much more of the front wheel. I'm quite sure I wouldn't understand Navier-Stokes equations! I like the idea of high speed testing round Thruxton with and without spoilers!
 
There is actually two reasons its not on my car yet. the second being I would like to get a mold made in case a kangaroo wants to take a close look at speed. I'm happy to supply it if you can find a suitable mold maker? I'm mid north coast NSW so not that far from SEQ
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I don't know anyone who would make a mould any better than anyone else really - but if you do decide to have a spare made I'd love to talk about getting one as well!
 
As an aside to air flow issues....Many years ago I saw a Rover stationary gas turbine (1S60?) in a tech college heat engine lab. The actual inlet to the compressor was probably under 200mm in dia, but the bellmouth feeding it was of the order of 1m in dia.
 
unstable load said:
I'm in Cape Town, which for couriers is a license to print money, and for the mail, a total throw of the dice.

Ideally, if I could find a 3D scan of them, a friend's son could router the moulds for me to make a set.
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That's the thing, I run a business that does reverse engineer and remanufacture classic car parts and accessories. I'm not comfortable about sharing what would be intellectual property. However, if we can find a metal laser cutting vendor in your part of the world I don't see a problem with getting the aluminium spoilers I was thinking of being made up made there for you as a drop ship service.
 
the Scoops are NADA like but not NADA. The front edge of the NADA ones is squared and the top lip is forward of the sides. They also have drain slots on either side which line up with an internal gutter so the rain water on the bonnet doesn't go into the engine....Making an air dam mold is on my list but Garage/Shed is coming first....

The post that picture came from states they were made by "the Australian Rover Club" which I think means the Victorian club...
 
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sdibbers said:
However, if we can find a metal laser cutting vendor in your part of the world I don't see a problem with getting the aluminium spoilers I was thinking of being made up made there for you as a drop ship service.
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There are a few laser cutters around Cape Town.

Explain the drop ship service, please?
You get them to cut the stuff and I collect it?
 
unstable load said:
There are a few laser cutters around Cape Town.

Explain the drop ship service, please?
You get them to cut the stuff and I collect it?
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Drop shipping is I use a third party to get the part made locally then ship directly to you when completed. That should reduce shipping worries for you.
 
OK, colour me interested, but first, the price, please?
I will be happy to collect them in the greater Cape Town area.
Vulcan and Schuurman are the big ones, Vulcan is about 15 minutes down the road, I will need a good horse to get to Schuurman.:)
 
unstable load said:
OK, colour me interested, but first, the price, please?
I will be happy to collect them in the greater Cape Town area.
Vulcan and Schuurman are the big ones, Vulcan is about 15 minutes down the road, I will need a good horse to get to Schuurman.:)
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Hi, I’ll need to arrange a time to scan a 3500 valance. I have a friend in CT with one and will try arrange things when the snow storm has passed. Stay tuned!
 
Quick update. I spoke to a chap with a 3500S (NADA) over here. His car is in the shop having a new pair of head gaskets fitted, once its free again I will try and get over to 3D scan the front end. Once that's done I'll have a look at various forms we can produce in profiled aluminium to make an affordable spoiler kit. Watch this space!
 
Getting back into this area lately. Suffered a setback a while ago (damaged offside front in a flatbed accident), but am now caught up with most issues, so have time (and inclination) to finish the spoilers off. My 2 are not mirror images, as the captive nuts inside are different left to right, so I made separate drilling templates. Got a spray can made up in Mexico Brown, now waiting on primer to suit. The bolts for the offside spoiler got lost in the accident, so need to get some stainless fixings.
 
A chap over on the facepalm Rover P6 Club page (or one of the various P6 pages on fb at any rate!) recently 3D scanned a pair of front spoilers for the 3500 P6 and has had a small run of them 3D printed. I seem to recall his first name was Barney. His surname is the name of England's Patron Saint. Anyway, for those wanting a pair of these front spoilers, he's your man, and that section of that social media site is where you'll have to look for him.
 
Very unhappy! As the 2 BSF bolts for the captive nuts in one spoiler got lost I ordered some more in stainless. Wont go in, binds very quickly. OD is 0.245", other originals are 0.230". Both 26 tpi. Specs for 1/4 BSF give OD as 0.250. WTF???
Tried M6 in one spoiler - very loose, no real grip. In the other spoiler...nice and firm, good fit. More WTF?
 
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Are they BSF or UNF? The difference is in the angle of the thread one is 55 degrees the other 60 degrees. It would very likely be UNF.
 
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