Bloodhound LSR Thread As Requested...
Discussion
IN51GHT said:
Roland (head of stress)
What a rotten job that must be!Does he have to soak up all his workmates anxieties and problems?
And then once he has does everyone else carry on working on the project without a care in the world in a tranquil environment whilst the poor chap, near to breaking point, locks himself in a small room ready to start punching and head-butting the walls?
Max_Torque said:
Silent1 said:
Max_Torque said:
IN51GHT said:
In the region of 800mph, they will be deployed to maintain a constant 3g deceleration by using a close loop control system with the line pressure as the input.
"line pressure"? As in brake line pressure?Or they've worked out the required pressures and have set pressures for certain speeds, but it would be cool if the deployment ratio matched the deceleration meaning you just have to hold x-psi in the line and it slowly opens as the car slows.
As the aerodynamic drag is a function of the square of the speed then they'll need to open faster as the case sites down to have the same effect, however as they open more the frontal area will be getting bigger generating more force. That might explain why the ratio is non linear, but I might also have made it up.
The thing with having to push on with build before all of the analysis has been completed is that occasionally something bites us.
Here Roland picked up a potential stress hotspot where we are trying dump the skin load into the side rail, so just to make sure we had to beef the area up.
It necessitated a doubler on the outside, an additional Ti angle on the inside & a strap over the joggle in the angle.
The increase in drag will be immeasurable.
The layers of masking tape between the contact faces replicate the thickness of the film adhesive that is being used on final assy.
Here Roland picked up a potential stress hotspot where we are trying dump the skin load into the side rail, so just to make sure we had to beef the area up.
It necessitated a doubler on the outside, an additional Ti angle on the inside & a strap over the joggle in the angle.
The increase in drag will be immeasurable.
The layers of masking tape between the contact faces replicate the thickness of the film adhesive that is being used on final assy.
CB2152 said:
Whilst trying to find out whether my ex ATC squadron managed to get their name on, I found the site where you can view every name that's going on the fin.
Fourth line down on the very right hand side, the Pistonheads Fin Allegation from a few pages back
Thanks Insight
A pleasureFourth line down on the very right hand side, the Pistonheads Fin Allegation from a few pages back
Thanks Insight
IN51GHT said:
We know the hydraulic line pressure, car speed & angle of the doors, from which we are calculating angle at any given speed as part of the closed loop control.
If you're "closed loop" on vehicle deceleration, then everything else just falls out in the wash (or more accurately in the "gains" you choose for you controller.......)Of course, the clever bit is low pass filtering your acceleration signal so that your controller isn't perturbed by accelerations (or noise) it can't respond too (i'm guessing it's going to take something like 1 to 2sec to open those doors from closed, meaning your control bandwidth is going to be something less than 1Hz, ie pretty slow, and hence not exactly processor intensive. Of course, you'd also want some door angle limits and probably a suitably calibrated "feed forward" table of angle Vs velocity for any given deceleration target etc to avoid saturation and overshoot in the control response.
Sorry to get a bit off-topic here, but can anyone tell me why Thrust SSC employed that offset-tandem rear-wheel configuration? I have always wanted to get to the bottom of it but have never seen an explanation. It seems completely unnecessary and try as I might I cannot think of a more clumsy arrangement. It was a feature just waiting to become a problem, and very nearly did! A simple set-up like Bloodhound's side-by-side front wheels would seem to offer a far more obvious design solution.
Thanks Insight for this wonderful forum.
Colin
Thanks Insight for this wonderful forum.
Colin
dave1409 said:
I think that might be inaccurate because it's a rehash of old information.The Cosworth engine for the oxidiser pump is defunct, for example.
I'm not sure the Nammo rocket has actually been tested yet - or how many have been run together (unlike the original plan, the Nammo rocket will probably be a cluster).
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