Best Lookng Kamm Rear Ends?

Author
Discussion

P5BNij

15,764 posts

105 months

Tuesday 1st September 2015
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Tipo 33... smile






robemcdonald

8,716 posts

195 months

Tuesday 1st September 2015
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for your consideration



obviously not up there with some on this thread.

rohrl

8,711 posts

144 months

Tuesday 1st September 2015
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Ferrari 250 GT "Breadvan"



And the "other Breadvan" Iso Rivolta.


LordBretSinclair

4,285 posts

176 months

Tuesday 1st September 2015
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The sister car has already been posted but this just looks so good in action smile


vpr

3,701 posts

237 months

Tuesday 1st September 2015
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Is this one?


Vanin

Original Poster:

1,010 posts

165 months

Wednesday 2nd September 2015
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The Charger is about as ugly as the Alfa Tipo 33 is beautiful!

I think that a line must be drawn between cars that have a definite Kamm tail where the whole car has been designed around airflow from the front to the rear with little compromise (Shelby Daytona) and cars that have been tweaked at the rear end with a mini spoiler just to improve the airflow a bit but not dig into boot space. (Early Aston Virage)

tapkaJohnD

1,930 posts

203 months

Wednesday 2nd September 2015
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Vanin,
As I think an earlier poster said, Prof.Kamm claimed no downforce for his design, but stability and low drag.
The most stable shape, with the lowest drag, is the teardrop, but that demands an excessively long tail. He showed that the cut-off tail generated vortices behind the car that made for a 'virtual' tail and kept the same or near stability, and minimised drag. The latter effect is even useful in the design of bicycle frames!
Other designs generate alternating vortices, that swing the back side to side and dragging turbulence.

Many of the Kammbacks above lack the sharp edge to the cut-off that Kamm insisted on and allows the effect he found.
John

DonkeyApple

54,923 posts

168 months

Wednesday 2nd September 2015
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I think this thread certainly highlights that there are some stunning 'flat back' cars out there regardless of aero merit.

Vanin

Original Poster:

1,010 posts

165 months

Wednesday 2nd September 2015
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tapkaJohnD said:
Vanin,
As I think an earlier poster said, Prof.Kamm claimed no downforce for his design, but stability and low drag.

John
I thought that the reason Aston put the Kamm tail on the DB6 was because the DB5 was deemed to be unstable at 120 mph due to lift at the rear. The Kamm put 100 lbs downforce instead of the uplift and therefore gave stability.

Are you saying that Kamm's designs did not include the flip up tail but just the cut off teardrop?

GT6 Jonsey

845 posts

121 months

Wednesday 2nd September 2015
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Yertis

18,016 posts

265 months

Wednesday 2nd September 2015
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GT6 Jonsey said:
What is that ugly horribleness?

//j17

4,471 posts

222 months

Thursday 3rd September 2015
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Vanin said:
I thought that the reason Aston put the Kamm tail on the DB6 was because the DB5 was deemed to be unstable at 120 mph due to lift at the rear. The Kamm put 100 lbs downforce instead of the uplift and therefore gave stability.

Are you saying that Kamm's designs did not include the flip up tail but just the cut off teardrop?
Correct. A car that follows Kamm's research 100% would just cut off with no flip. The Kamm tail is all about managing the flow separation at the rear of the car to minimise drag and Kamm found that while a single, abrupt stop created a turbulent, draggie wake it was a lot less draggie than having multiple stops (top/rear of roof, rear of side glass, rear of boot lid for example).

Of course there's more to designing a car than worrying about the drag coefficient and if while adding a lip spoiler to your Kamm tail will increase it's drag if it keeps the rear wheels on the road it's a compromise worth making.

LordBretSinclair

4,285 posts

176 months

Thursday 3rd September 2015
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Yertis said:
GT6 Jonsey said:
What is that ugly horribleness?
I assume you are taking the mick as we all know that is a gorgeous Renault Alpine A110


RichB

51,431 posts

283 months

Thursday 3rd September 2015
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SpeckledJim said:
//j17 said:
Making no excuses for brand bias I've always liked the Triumph '70s rear end, in this case a GT6:

If this was an Italian manufacturer I'm sure it would be 'recognised' as a work of genius. It's just gorgeous.
Absolutely, if it was say a small engined Maserati or an OSCA people would be fawning over it. Oh hang on Michelotti was Italian. scratchchin

dig123

339 posts

115 months

Friday 4th September 2015
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Spydaman said:
Does this count?
Have you ever burnt you leg on the exhaust?

Skyedriver

17,661 posts

281 months

Saturday 5th September 2015
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slomax said:
ive always loved the Marcos back end, especially on the 3 litre.



Page 1 and a winner!

PowerslideSWE

1,116 posts

137 months

Saturday 5th September 2015
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P5BNij said:
Tipo 33... smile





Could also pass as one of the prettiest cars ever made or even here: http://www.pistonheads.com/gassing/topic.asp?h=0&a...

bencollins

3,486 posts

204 months

Saturday 5th September 2015
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eccles

13,720 posts

221 months

Saturday 5th September 2015
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My old Jem had a Kamm tail...


GT6 Jonsey

845 posts

121 months

Saturday 5th September 2015
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