Weekend with a 911 SC

[uktrailmonster]

g7jhp said:

The other option would be a ducktail. They're easy to swap on and off!

Not a bad compromise if you like the look, but still not as efficient as the later tails. Personally I wouldn't do the ducktail on an impact bumper car. It looks okay and it's a good lightweight option too, but I prefer the Carrera tail on these cars.

[uktrailmonster]

TB993tt said:

The level of anorakism on this thread is appalling

I had a quick peek and gleaned that on the H series Carrera, without the spoilers there is 180kg of total lift at 152mph and with them there is 17kg total lift at 152mph.

There are lots of coefficient of lift numbers so you can see just how safe you are popping to your next polishing meet at 60mph

Who's the anorak here then?

[TB993tt]

uktrailmonster said:

Who's the anorak here then?

The cap fits - you can see how unstable you should be feeling pottering to the shops at 30

[uktrailmonster]

TB993tt said:

pottering to the shops at 30

Well if that's how you use classic 911s then it really doesn't matter at all.

[TB993tt]

And below is the lift for the RS shape with and without duck tail. The front lift as long as you have the lower air dam is about the same with or without rear spoiler. If you don't that front air dam the lift gets quite scary by the numbers...

[TB993tt]

uktrailmonster said:

Well if that's how you use classic 911s then it really doesn't matter at all.

That 10kg of lift in the unspoilered car could cause you problems

[fastgerman]

Looks like spoilers are coming back in fashion :-)

After all, 911's are bought for handling in the main

With ducktail:

http://fastgerman.com/forum/cayman-r-and-911-sc-co...


As standard:

http://fastgerman.com/forum/porsche-911-sc/

[uktrailmonster]

The steady speed lift graphs are useful of course and give a feel for the overall numbers, but they don't tell the full story by any means. Yaw stability, crosswind stability and pitch sensitivity all play an important role in the real world too. With a 911, even a very average driver should be able to feel a positive benefit. It's not that subtle a difference. For example heavy braking from say 100 mph down to 30 mph in a 911 without wings (especially on a windy day) can be quite unnerving. On a 911 with front spoiler and tail, high speed braking is generally very stable. Certainly a big enough difference to make them worth having IME. It would appear Porsche had similar feelings.

[g7jhp]

uktrailmonster said:

The steady speed lift graphs are useful of course and give a feel for the overall numbers, but they don't tell the full story by any means. Yaw stability, crosswind stability and pitch sensitivity all play an important role in the real world too. With a 911, even a very average driver should be able to feel a positive benefit. It's not that subtle a difference. For example heavy braking from say 100 mph down to 30 mph in a 911 without wings (especially on a windy day) can be quite unnerving. On a 911 with front spoiler and tail, high speed braking is generally very stable. Certainly a big enough difference to make them worth having IME. It would appear Porsche had similar feelings.

I would agree which is why I went back to running the 3.2 with the Carrera tail.

[dugsud]

Another vote for the ducktail.......(any excuse)

[fastgerman]

Big spoiler goes with big bumpers :-)

[g7jhp]

I like all styles. There are no rights or wrongs, just choices!

Flat



Ducktail



Spoilered

[fastgerman]

Lovely day yesterday to take the SC out :-)