RE: Back-yard speed record attempt aims for 2,000mph
Discussion
doogz said:
Mr Gear said:
Something I don't understand about big-number land-speed record attempts is how wheels and tyres cope with the sorts of rotational speeds involved.
The bodywork, aerodynamics and power are easy, right? All this knowledge exists in aviation engineering, but wheel-speeds of 1,000+mph is uncharted territory.
http://www.bloodhoundssc.com/car/wheels.cfmThe bodywork, aerodynamics and power are easy, right? All this knowledge exists in aviation engineering, but wheel-speeds of 1,000+mph is uncharted territory.
Big wheels!
Hmmm
Greenslade said:
I FOR ONE CAN'T WAIT TO SEE THIS.
OTHER QUESTIONS TO BE ANSWERED WILL BE
AT WHAT SPEED WILL HE TAKE OFF ?
WHAAT ALTITUDE WILL HE REACH?
AT WHAT POINT WILL HE DIE ?
ITS A SHAME HE DOESN'T HAVE A COUPLE OF SPARE SPACE SHUTTLE SOLID FUEL ROCKETS HANGING AROUND.
HE COULD PROBABLY GO FOR 5000MPH THEN ( HE SPEED TERMINATED WHEN HE PLOUGHS INTO THE BLACKROCK MOUNTAINS LOL
Caps Lock - The internet equivalent of announcing your presence at a dinner party by whapping your johnson out and waggling it at the host shouting "I'M HERE!".OTHER QUESTIONS TO BE ANSWERED WILL BE
AT WHAT SPEED WILL HE TAKE OFF ?
WHAAT ALTITUDE WILL HE REACH?
AT WHAT POINT WILL HE DIE ?
ITS A SHAME HE DOESN'T HAVE A COUPLE OF SPARE SPACE SHUTTLE SOLID FUEL ROCKETS HANGING AROUND.
HE COULD PROBABLY GO FOR 5000MPH THEN ( HE SPEED TERMINATED WHEN HE PLOUGHS INTO THE BLACKROCK MOUNTAINS LOL
On topic - If this is ever built and he drives it, He'll probably be killed to death. But it will be a much more amazing death than yours or mine. Going out in style!
I read an article about Don Garlitz (sp?) about one of his drag runs gone wrong:
"He crossed the line 15 feet off the ground at 250MPH.
Upside down.
And on fire."
-Luckily very much still with us
Waldo has been making noises about Sonic Wind for a while but now, thanks to Pop Mechanics is getting more exposure. The clever guys at BLOODHOUND think 1000 mph is about the limit for current technology, so all the best to him in his workshop.
Getting up to speed safely is arguably the easy bit. Slowing down in the relatively short amount of desert, turning the car around, refueling the rockets / jet and going back within an hour - looks difficult.
IIRC Thrust SSC missed a record by just 50 seconds as they ran over the hour.
Getting up to speed safely is arguably the easy bit. Slowing down in the relatively short amount of desert, turning the car around, refueling the rockets / jet and going back within an hour - looks difficult.
IIRC Thrust SSC missed a record by just 50 seconds as they ran over the hour.
doogz said:
scal said:
Milks said:
He probably ought to do a little reading on air resistance and friction before he starts
totally agree! bloodhound has 4 times the power of thrust ssc just to go an extra few hundred miles an hour! I suspect this project will fail very fast indeed! Bloodhound SSC's main engine 27,500lbft of thrust. Not quite 4 times. More like half.
The wheels are easy, that's mainly a material thing as the forces acting on them are simple. The wheel bearings are another matter, trying to dissipate the heat generated at those speeds with that weight is tricky.
The biggest problem is ground effects. We understand ground effects (air-ground interface and being far too close to it) up to a few hundred miles per hour, but beyond that it's all simulations.
The old power cars were built by mechanics with a good eye for what was right and a big orkshop to repair the damage after failures. Going 1000mph+, the cars have more in common with planes and the failures are often not normally repairable.
Wonder if he could make it remote control? Would that count?
The biggest problem is ground effects. We understand ground effects (air-ground interface and being far too close to it) up to a few hundred miles per hour, but beyond that it's all simulations.
The old power cars were built by mechanics with a good eye for what was right and a big orkshop to repair the damage after failures. Going 1000mph+, the cars have more in common with planes and the failures are often not normally repairable.
Wonder if he could make it remote control? Would that count?
Skater12 said:
Question 1.
What does a Home Built rocket car + 57,000 lbs of thrust make?
Is the answer A. 2000MPH land speed record, or B. Rather rapid end to a mans life?
Perhaps he would be happy with A + B? At least it could be on his gravestone? What does a Home Built rocket car + 57,000 lbs of thrust make?
Is the answer A. 2000MPH land speed record, or B. Rather rapid end to a mans life?
How far from the ground does a landspeed record become a rocket?
sanctum said:
The wheels are easy, that's mainly a material thing as the forces acting on them are simple. The wheel bearings are another matter, trying to dissipate the heat generated at those speeds with that weight is tricky.
The biggest problem is ground effects. We understand ground effects (air-ground interface and being far too close to it) up to a few hundred miles per hour, but beyond that it's all simulations.
The old power cars were built by mechanics with a good eye for what was right and a big orkshop to repair the damage after failures. Going 1000mph+, the cars have more in common with planes and the failures are often not normally repairable.
Wonder if he could make it remote control? Would that count?
We'll find out just how much they have in common with planes soon:The biggest problem is ground effects. We understand ground effects (air-ground interface and being far too close to it) up to a few hundred miles per hour, but beyond that it's all simulations.
The old power cars were built by mechanics with a good eye for what was right and a big orkshop to repair the damage after failures. Going 1000mph+, the cars have more in common with planes and the failures are often not normally repairable.
Wonder if he could make it remote control? Would that count?
http://www.landspeed.com/
I'm quite worried for them.
Bit more to it than the slowing down bit - they are running out of places to make the runs. Getting up to speed and down in a short enough space is the issue. it is becoming more about acceleration than just speed over the measured distance.
The 1000mph target is also pretty much the limit for the salt flats that are currently the preferred location. The salt flats are also proving not to be flat enough. On top of that the ground basically liquifies down to a few feet from the supersonic pressure wave.
When SSC got its record the observers had to travel the whole length of the run digging down to solid ground to make sure that SSC didn't actually lift off at any point. If it had the run is invalidated.
The 1000mph target is also pretty much the limit for the salt flats that are currently the preferred location. The salt flats are also proving not to be flat enough. On top of that the ground basically liquifies down to a few feet from the supersonic pressure wave.
When SSC got its record the observers had to travel the whole length of the run digging down to solid ground to make sure that SSC didn't actually lift off at any point. If it had the run is invalidated.
doogz said:
Vocal Minority said:
Doogz - bloodhound ssc is a rocket hybrid
Isn't the EJ200 to get it rolling to 300mph or so?Even so, it's not 4 times more powerful.
The actual power output of the X15 engines might be rather high vs the EJ/hybrid rocket combo...
Also, the frontal area and drag coefficient might be significantly lower since the project isn't using a large turbofan engine in the middle of his vehicle.
I'm not saying that makes it all ok. But you can't just compare thrust ratings without lots of other info.
It's not clear either if he intends to use one or two X15 engines, two of them would be well over twice the rated thrust of the Bloodhound, and I'm assuming with much higher gas velocity/combustion pressure too!
I doubt there is any issue in getting it to 2000mph, it's just if it does it going forwards while still on the ground
Dave
Mr Gear said:
Something I don't understand about big-number land-speed record attempts is how wheels and tyres cope with the sorts of rotational speeds involved.
The bodywork, aerodynamics and power are easy, right? All this knowledge exists in aviation engineering, but wheel-speeds of 1,000+mph is uncharted territory.
The bodywork on Thrust SSC was having to be patched up after every run as it was literally curling off the car at speed. The bodywork, aerodynamics and power are easy, right? All this knowledge exists in aviation engineering, but wheel-speeds of 1,000+mph is uncharted territory.
They also had a number of problems with wheels, but I cant remember what they were. If memory serves they were aluminium discs.
bakerstreet said:
The bodywork on Thrust SSC was having to be patched up after every run as it was literally curling off the car at speed.
They also had a number of problems with wheels, but I cant remember what they were. If memory serves they were aluminium discs.
I have just been reading about it: They were 140kg grooved discs with no tyres.They also had a number of problems with wheels, but I cant remember what they were. If memory serves they were aluminium discs.
jimbro1000 said:
Bit more to it than the slowing down bit - they are running out of places to make the runs. Getting up to speed and down in a short enough space is the issue. it is becoming more about acceleration than just speed over the measured distance.
The 1000mph target is also pretty much the limit for the salt flats that are currently the preferred location. The salt flats are also proving not to be flat enough. On top of that the ground basically liquifies down to a few feet from the supersonic pressure wave.
When SSC got its record the observers had to travel the whole length of the run digging down to solid ground to make sure that SSC didn't actually lift off at any point. If it had the run is invalidated.
If your talking about the salt flats un Utah, then they weren't used for Thrust SSC's record breaking runs. I think they were done in Jordan.The 1000mph target is also pretty much the limit for the salt flats that are currently the preferred location. The salt flats are also proving not to be flat enough. On top of that the ground basically liquifies down to a few feet from the supersonic pressure wave.
When SSC got its record the observers had to travel the whole length of the run digging down to solid ground to make sure that SSC didn't actually lift off at any point. If it had the run is invalidated.
Morningside said:
This is the sort of fighting engineering spirit we had here.
Frank Whittle, Christopher Cockerell, Malcolm Campbell etc. NO computer CAD and yet they got built and worked.
Maybe he IS mad but good luck to him.
Exactly.Frank Whittle, Christopher Cockerell, Malcolm Campbell etc. NO computer CAD and yet they got built and worked.
Maybe he IS mad but good luck to him.
Yes there is an element that as we push to extremes we need to refine our design tolerances and that requires computers, but there is also the idea that we can just shove a shed load of power through a pointy object and pray
Dave
Morning side - he is facing a very different challenge to the abovelisted! That and they all used the contemproary equivalent, eg expert mechanics, draftsmen and design knowhow etc.
Bloodhound I believe go in the same vein as those men, but they are just using everything at their disposal. This man I fear, isn't.
Bloodhound I believe go in the same vein as those men, but they are just using everything at their disposal. This man I fear, isn't.
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