Re: So...
Think we need to make the turd polish more toxic
1181 publicly visible posts • joined 24 May 2010
"Obviously it's more than just helium, but what the hell has cost $100 million?"
Engineering cost + nice fat pay off for military contractor.
Ford usually spend around $2bn developing a new generation Transit van.
VW spend ~$13Bn/year on R&D.
Boeing spent $32bn on the Dreamliner.
So $100m for a prototype is cheap TBH.
No the air is slowed to subsonic speeds, that is why there a inlet cones on the front of the engine.
Slowing the air causes compression and resultant heat. Hence the need for the pre-cooler.
There is a compressor stage which feeds the rocket engine with air.
It does not compress and cool to liquid, for the icing problem.
HOTOL is a LACE engine Liquid Air Cycle Engine, this is a VACE Vapour Air Cycle Engine.
It is not a Jet in the traditional sense, that is just poor understanding on the part of the reporter.
It's an air fed rocket engine. They just happen to use a turbine to put the air into a format the rocket can use.
There is a political issue as well, the extreme greenies want a much greater reduction in emissions (for obvious reasons) than can realistically be achieved with the technology available at a cost effective rate.
Automotive OEMs are driven by their markets and cost.
The purchasers (in general) want a fast, cheap car, that doesn't break down and does 100mpg.
Most governments are being pushed on AGW, which is pushed on the OEMs, who want the cheapest solution that appeases the regulators and their market.
1. Radiation out in space is much more damaging to electronics than under this nice atmosphere and magnetosphere.
2. There are a lot more computers on Earth for the 'AI' to infect and make use of, greater power, from the perspective of the AI.
The problem with big projects is they have feck all to do with efficiency or saving money or improving things.
They are about those in charge making appearances as though their tenure actually achieved something and feeding money to those party sponsors who assisted them in getting elected.
There are functions that will need this kind of bandwidth, but not that many.
It will become more prevalent with autonomous vehicles, with potentially high bandwidth sensors.
Question is does it offer more than say CAN-FD or Flexray if there is this need?
One of the main advantages of CAN is that a large portion of the bus management is done in HW. When operating on lowest cost Microcontrollers this can make a big difference!
Especially when they can be running between 80-90% CPU load when operating, adding extra communications processing is going to be greater cost add.
There's a distinction between firmware and tune. Most systems will have one firmware and multiple tunes, basically they will use the same system on different models of vehicle and so the tune is selected for the vehicle. They generally modify the tune, rather than the firmware.
Both have signatures, but the signatures need to be capable of being updated, as the systems sometimes need updates, the firmware generally checks the signatures at runtime to check for memory corruption among other things.
How they get around this I do not know.