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This was being tested at Cambridge in 1962! The relevant professor bemoaned the fact that the cheapest commodity in the aviation industry was concrete.

They didn?t attract finance to do that.

And it wasn?t a toy either.

I don't know when it was, but I do know that, in one set of trials, an Airspeed Oxford was fitted with an auxiliary engine to run the pump. The idea was revived again in the 1990s, but for supersonic aircraft.

The aptly named lift dependent drag, which, for a given amount of lift, can still be reduced by techniques, such as achieving laminar flow over the lifting surfaces. However, any that does not produce lift is parasitic drag and the aircraft would be better off without it.

On 29/04/2015 18:20, Dave Plowman (News) wrote: ...

The earliest experiments used gunpowder.

The Cambridge work used an Auster as the airframe.

Its actually very much less, Linux is just a copy of the Unix kernel, all the specifications of Unix were public at the time so it was relatively easy to build a copy..

Name another one that was worth buying at that time.

It looks like the Unix kernel, it quacks like the Unix kernel, its a copy. You do know linux is only the kernel?

The open source software written to use Linux is quite capable of running on other OSes, you don't even need Linux to run the majority of it (although many of the utilities don't make much sense on some OSes).

I'd go with useful advance. Not significant breakthrough.

You kept saying what he did was a significant breakthrough. Stop wriggling and trolling.

It took his reply with that string of denials to make me realise he was just trolling. I've now KF'd him. With luck, he'll do the same to me!

No, on the open source alone.

No it is not.

Its gone on from that to much more than that.

Plenty just used what it came with and never used VisiCalc at all.

Not given what has changed since then.

Its much more complicated than that, particularly with what is used on smartphones.

I wasn?t talking about that, I was talking about the open source Linux.

What's changed in the kernel used on PCs that makes them not a copy of Unix?

You will find they use kernels based on Linux, i.e. not linux but some derivative that has different memory management, etc.

So you are only talking about a kernel, what use is that, it doesn't do anything useful, its the other stuff like ed, vi, gnome, etc. that does useful stuff and that isn't Linux and doesn't need Linux.

VisiCalc was a significant breakthrough with how things were done before it.

No I didn?t, I said that he did what he did in his shed/garage.

I wasn?t talking about just the kernel.

Still comes from Linux.

No, the totality of Linux and the derivatives.

what use is that, it doesn't do

It is in fact much more complicated than that, particularly with what is used on smartphones.