Bloodhound LSR Thread As Requested...
Discussion
Zad said:
Unfortunately it only seems to work on machines with a proper GPU and Chrome/Firefox. It does make me want to find some CFD software though and have a more advanced play.
Having spent the last couple of years of my PhD heavily involved with research level CFD investigating ship-airwake interactions on helicopters. I can tell you that CFD isn't the least bit glamorous and it involves twenty hours a day sitting in front of a computer drinking copious quantities of coffee. In my experience 90% of my time is cleaning up rubbish CAD models and generating meshes, the rest is usually shouting at the computer, drinking more coffee and explaining what the results mean to people who have no idea what CFD is... Back on topic, there are free open source CFD solvers out there, OpenFoam being a decent option, there are also some open source meshing tools as well but I haven't used them so can't comment on their performance.
(My first post! I've been lurking for a while and I actually joined to post on the CFD thread in the Science! forum, but there was a ban on new posts so I carried on with, what else, more CFD....)
Storer said:
IN51GHT said:
The obvious starting point I guess would be to find out where the areas of high pressure and velocity are.
Thought about a roof mounted duct? Like the air intake on a Mac F1?
I already have this duct on the current clam and will be creating something similar on the second one. It supplies the engine air filter and is sealed keeping engine heat out.Thought about a roof mounted duct? Like the air intake on a Mac F1?
The exhaust headers are just in front of the rear wheels with a central silencer above the transaxle.
Paul
http://ri.search.yahoo.com/_ylt=A2KI9kSnJiRT0Q4Aad...
Obviously the shape of the F1 duct is a lot different to whats required but you get the idea.
ETA 5th picture down.
Mark, Here is that F1 bit I was on about http://www.pistonheads.com/gassing/topic.asp?h=0&a...
Had a very interesting chat with Ron Ayers last week as part of writing an article on Bloodhound: http://arstechnica.com/gadgets/2014/03/bloodhound-...
Thanks to the OP for inspiring me to write this one, even if you never replied to any of my requests to use your photos.
Thanks to the OP for inspiring me to write this one, even if you never replied to any of my requests to use your photos.
Dr JonboyG said:
Had a very interesting chat with Ron Ayers last week as part of writing an article on Bloodhound: http://arstechnica.com/gadgets/2014/03/bloodhound-...
Thanks to the OP for inspiring me to write this one, even if you never replied to any of my requests to use your photos.
I'm pretty certain I replied, it's not a problem.Thanks to the OP for inspiring me to write this one, even if you never replied to any of my requests to use your photos.
Dr JonboyG said:
Apologies - never saw a reply. Jules told me to use Stephen Marjoram's pics from Flickr, and like I say, I owe you a big thanks for giving me the idea to write about it.
CraigyMC - thanks, have fixed that typo too.
No bother. By the way, I'm pretty sure that while Bloodhound has a single EJ200 in it, the project itself has three of them: two runners and one to be used/cannibalised for spares. The engines have backing from the engine company Rolls Royce, this itself is against Rolls' usual policy: an exception has been made because of how Bloodhound is going about things. The engines themselves are from the development program (of the Eurofighter Typhoon), and the two runners have very limited useful life left in aircraft terms - not enough to be operationally useful. If not used for Bloodhound, they would otherwise be simple museum pieces, so the UK MoD has loaned them to the project.CraigyMC - thanks, have fixed that typo too.
In Bloodhound terms, the time left on them is sufficient for their purposes.
There are questions about why the car uses a jet at all - why not just use a rocket for everything?
Bloodhound is at its least stable (aerodynamically speaking) up to about 300mph. That's what the jet is for, as well as operationally getting the vehicle running up and down runways and for testing and so on.
If this sounds a bit like fitting a crappy motor just to test with, please understand that it most certainly is not.
The EJ200 is easily the highest performance jet anyone has put in an LSR car:
- it's a very small engine for the thrust - 29" diameter
- it weighs circa 2,180lb [990kg], and produces up to 20,000lbf thrust [9090kg] in reheat
- to put things in perspective, if Bloodhound comes in on target for weight, the jet engine alone would have no problems at all hurling the vehicle into the sky because the thrust exceeds the weight.
Dr JonboyG said:
Had a very interesting chat with Ron Ayers last week as part of writing an article on Bloodhound: http://arstechnica.com/gadgets/2014/03/bloodhound-...
Thanks to the OP for inspiring me to write this one, even if you never replied to any of my requests to use your photos.
What a backhanded compliment, it comes across as incredibly snarky.Thanks to the OP for inspiring me to write this one, even if you never replied to any of my requests to use your photos.
If the photos were that important why didn't you email him?
Silent1 said:
What a backhanded compliment, it comes across as incredibly snarky.
If the photos were that important why didn't you email him?
Without wishing to be argumentative, I think the comment was because he didn't reply to one or more emails.If the photos were that important why didn't you email him?
It did sound somewhat blunt though and could have been phrased better.
IN51GHT said:
You keep telling us you're busy. Looks like a few blokes standing round drinking tea to me. 
IN51GHT said:
Mmm. Quadcopter. What sort? (hobby of mine)IN51GHT said:
CraigyMc said:
Mmm. Quadcopter. What sort? (hobby of mine)
Hubsam X4 - £40 on ebay.I'm going to do a proper flight around the workshop later to give an idea of the facility.
If you need spares for it, I have found the chinese site www.banggood.com to be fairly decent for them (very cheap), although you can often wait several weeks for delivery. They do upgraded spares too (better batteries and the like).
http://www.banggood.com/buy/hubsan/133-0-0-2-0-24-...
I'm currently waiting for a pair of nano helicopters to learn 3D flight (ie. ones with collective, to permit stuff like hovering upside down).
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