Lotus 49 Ducted Windscreen
#1
Posted 21 February 2003 - 05:21
Was it to vent cooler air to the driver or aimed at smoothing the flow over the cockpit?
Was it a success?
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#2
Posted 21 February 2003 - 06:48
The idea was the create a jet of air over the driver's head and to reduce the windscreen height (IIRC) at the same time as it made the car more streamlined.
#3
Posted 21 February 2003 - 09:28
Colin Chapman - The windscreen went through a change in 1963. The drivers were complaining of a lot of buffeting in the cockpit and, of course, to get the screen high enough to stop the buffeting would have reduced visibility, particularly in the corners. And so, in 1964, we went to the slotted type screen - a double - screen enclosing a converging passage in which the air is speeded up to emerge from the top in a high speed stream which deflects the ordinary air.
Charles Bulmer- A sort of jet-stream barrier to prevent the normal air-flow curling into the cockpit region quite so soon.
Colin Chapman - That's right. It meant that we could lower the leading edge of the screen by about two inches which improved visibility tremendously. The drivers were delighted. Then at Monza, last year, we put the old one back just to see if there was any measurable difference in drag. There wasn't, but the drivers said they couldn’t drive with the conventional screen after they’d been used to the slotted one.
#4
Posted 21 February 2003 - 09:56
DSJ?
#5
Posted 21 February 2003 - 17:37
#6
Posted 21 February 2003 - 17:42
#7
Posted 21 February 2003 - 22:29
#8
Posted 21 February 2003 - 23:04
(qoute)
Ray Bell Mustn't have worked, I don't think he wore it the day he set fastest lap in the rain at Warwick Farm...
Ray i seem to recall that some body did wear one of those vertical frizbee rain
shields at the "FARM" .However i can,t remember who it was it was about the
same time as HILL in the wet race.
#9
Posted 21 February 2003 - 23:23
But I'm open to correction.
#10
Posted 21 February 2003 - 23:49
Originally posted by fines
That's why Graham Hill once (Nürburgring F2 '68?) used that strange 'propellor' visor!
Did Hill drive F2 at the Nurburgring in 1968? The only time I can remember him using that visor was at Snetterton in 1964 (in a BRM of course, as Ray mentioned).
There were other cars that used the Lotus-like slotted windscreen. The ones that spring to mid are the P126/P133 BRMs (designed by Len Terry) and the early Matras (MS5, 7 and 10).
#11
Posted 22 February 2003 - 00:38
#12
Posted 22 February 2003 - 01:09
#13
Posted 22 February 2003 - 02:48
..... and here is the beastie!
(Photos from Motor Sport Magazine)
Rob
#14
Posted 22 February 2003 - 09:56
Fascinating.
So I gather it was using the venturi effect to smooth the airflow over the cockpit.
That'll do nicely. And yes, I see it on the baby Lotuses too. I wonder why it's not being used today, since Jimmy and Graham liked it.
It just shows the sophistication of CC's thinking. Compare the 'pop-rivet' construction of the succesful 1976 McLaren with the previous decades Lotus 33. If you were to ask somebody who knew nothing about F1 history, I vouch almost all would say the McLaren predates the elegant Lotus.
Thank you for the images of Graham. Only he'd get away with wearing that thing with a straight-face eh? I could imagine him on 'Call My Bluff' passing it off as him testing the earliest Head-up display for the RAF.
I'm sure they were for-sale in the pages of the motorbike mags of the sixties.
Imagine the visibility, with a 1" donut sitting on the crown of your conk, and a half-inch supporting band running right along your sightline. And the whole idea is to IMPROVE viz. Potty!
At the speeds of British bikes in the 60's, I don't think it'd turn at all.
AM
#15
Posted 22 February 2003 - 11:46
I didn't check! I just have this image in my head from a poster I had probably 15 or rather twenty years ago in my room, with Graham in a GLTL car that looked (from memory) too small for an F1.Originally posted by Roger Clark
Did Hill drive F2 at the Nurburgring in 1968? The only time I can remember him using that visor was at Snetterton in 1964 (in a BRM of course, as Ray mentioned).
Damn puberty! Why does one have to grow up and throw away one's childhood treasures...
#16
Posted 22 February 2003 - 18:12
The rotating visor is pretty common in Karting (or was a few years ago anyway).
#17
Posted 22 February 2003 - 18:24
#18
Posted 22 February 2003 - 23:14
DCN
#19
Posted 23 February 2003 - 01:05
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#20
Posted 23 February 2003 - 01:25
That visor is quiet popular in karting. We all use it in heavy rain.Originally posted by Wolf
Thanks alot, guys; both for photos and explanations.
#21
Posted 23 February 2003 - 07:16
I bought one of them 3 years ago never been able to use it the drought has seen too that.
#22
Posted 23 February 2003 - 07:21
Originally posted by Doug Nye
The rotating visor as pictured was devised and/or marketed by none other than Lance Macklin, former HWM, Austin-Healey, Le Mans and Dundrod disasters etc driver - who based it upon the rotating 'clearscreen' wheelhouse window devices with which he was familiar on his father's Fairmile motor torpedo and motor gunboats, the family yacht, almost any relatively small sea-going craft.
DCN
Good Ol'Lance!
I bet he came up with an (equally bonkers) name for his invention ... Go on tell us Doug ...
And then sold the rights to Yankee 'Propeller- Head' Karters!
Sorry Chaps, couldn't resist.
AM
#23
Posted 23 February 2003 - 07:29
I don't recall seeing those clever (American!) NACA ducts on any GP motas before they appeared on the Lotus. They must've been used in sports cars before GP cars surely?
Anybody know the first racing car, and F1 car to incorporate them?
They must make a huge saving on drag compared to a scoop.
AM
#24
Posted 23 February 2003 - 09:46
It's important to note, according to the article, that the exact shape and dimensions are critical for proper performance.
#25
Posted 23 February 2003 - 23:08
DCN
#26
Posted 27 February 2003 - 05:04
Originally posted by Doug Nye
Try Connaught....built by ex-RAF officers, aeronautical engineers and one hugely experienced test pilot...
And one was driven by that Lance Macklin bloke too! Not to mention Collins and Moss.
Accordingto this Atlas article by Mr. O'Keefe...
"In 1954, Formula One was going to a 2.5 litre standard and Clarke was scrambling to come up with a new engine and considered a V8 engine project being promoted by Leslie Brooks as well as a V8 engine from Coventry Climax. An entirely new car, which had some very advanced design elements (monocoque tub section with the V8 engine and a transaxle gearbox mounted in the rear and attached to the tub in the manner of the later Lotuses), was designed around the hoped-for V8 - it was called the Connaught J5 - but the whole concept fizzled when the so-called Coventry Climax Godiva V-8 project was shelved by Climax.
With the J5 project on the backburner, Clarke and his draftsman turned to work on another front-engined Connaught to be designated the B-Type and the first of that line was up and running by September 1954, too late for the 1954 season. The initial body-style was a streamliner, complete with NACA ducts, whose full-width bodywork covered the wheels, like the Mercedes-Benz W196 Stromlinienwagen introduced on July 4th 1954 at the French Grand Prix. It is fascinating that two companies as disparate in location and resources as Connaught and Mercedes-Benz could come up with the same concept at the same time. In the absence of a V8 being available, Clarke and Mike Oliver arranged for the 2.5 litre twin-cam four-cylinder Alta engine to be supplied exclusively to Connaught. Ultimately, Mike Oliver was able to squeeze about 240 bhp out of these Alta engines. The B-Type was to have Dunlop alloy wheels and servo-assisted disc brakes."