Things you always wanted to know the answer to [Vol. 3]
Discussion
Vipers said:
Why do cars have three point seatbelts and planes have lap belts.
If as we know, lap belts are bloody dangerous in cars, why not so in planes.
Equally, why don't airliner lifejackets have crotch straps? An airliner lifejacket will not keep your head out of the water for very long because the lack of a crotch strap means it will ride up. If as we know, lap belts are bloody dangerous in cars, why not so in planes.
Ayahuasca said:
Vipers said:
Why do cars have three point seatbelts and planes have lap belts.
If as we know, lap belts are bloody dangerous in cars, why not so in planes.
Equally, why don't airliner lifejackets have crotch straps? An airliner lifejacket will not keep your head out of the water for very long because the lack of a crotch strap means it will ride up. If as we know, lap belts are bloody dangerous in cars, why not so in planes.
Also, it has to be VERY simple to put on, by panicking people of all ages and physical abilities, in a very cramped space, perhaps in the dark, bouncing around, etc, etc,
SpeckledJim said:
Ayahuasca said:
Vipers said:
Why do cars have three point seatbelts and planes have lap belts.
If as we know, lap belts are bloody dangerous in cars, why not so in planes.
Equally, why don't airliner lifejackets have crotch straps? An airliner lifejacket will not keep your head out of the water for very long because the lack of a crotch strap means it will ride up. If as we know, lap belts are bloody dangerous in cars, why not so in planes.
Also, it has to be VERY simple to put on, by panicking people of all ages and physical abilities, in a very cramped space, perhaps in the dark, bouncing around, etc, etc,
Hope it's not been done before, but when out running on pavements, cycle paths etc. I keep coming across these small metal dome head bolts and flat washers sunk into the tarmac/concrete. Always a bolt and a washer together, usually slightly rusty but worn smooth. Thought maybe they were just a UK thing, but was recently running on holiday in Florida and saw a load of them there as well. Doesn't seem to be any logical spacing between them (sometimes they are miles apart, other times one a few metres from the other) so my first thought (mile/km markers) doesn't seem to stack up. Any ideas?
blade runner said:
Hope it's not been done before, but when out running on pavements, cycle paths etc. I keep coming across these small metal dome head bolts and flat washers sunk into the tarmac/concrete. Always a bolt and a washer together, usually slightly rusty but worn smooth. Thought maybe they were just a UK thing, but was recently running on holiday in Florida and saw a load of them there as well. Doesn't seem to be any logical spacing between them (sometimes they are miles apart, other times one a few metres from the other) so my first thought (mile/km markers) doesn't seem to stack up. Any ideas?
Survey marker bolts.http://www.sccssurvey.co.uk/10zs-centre-marker-wit...
They usually come with a little dimple in the top to stick a survey pole, and that can then be used for repeated measurement.
When loading up lunch at a "salad bar" where you pay for your food by weight, I'm often plagued by which item offers the best value for money and which is the worst, does some ham/pasta which is heavy fill you up more than a load of green stuff that's lighter so you eat more but pay less?
What really throws things into chaos is that the hot food bar which contains curry, Chinese food is the same price! ($8.99 lb for each in case that helps with the diagnosis).
For clarities sake this is in the US but I assume things are still the same back home.
What really throws things into chaos is that the hot food bar which contains curry, Chinese food is the same price! ($8.99 lb for each in case that helps with the diagnosis).
For clarities sake this is in the US but I assume things are still the same back home.
Boozy said:
When loading up lunch at a "salad bar" where you pay for your food by weight, I'm often plagued by which item offers the best value for money and which is the worst, does some ham/pasta which is heavy fill you up more than a load of green stuff that's lighter so you eat more but pay less?
What really throws things into chaos is that the hot food bar which contains curry, Chinese food is the same price! ($8.99 lb for each in case that helps with the diagnosis).
For clarities sake this is in the US but I assume things are still the same back home.
If you want to feel full for longer the least cooked protein (meat normally) is where it's at. What really throws things into chaos is that the hot food bar which contains curry, Chinese food is the same price! ($8.99 lb for each in case that helps with the diagnosis).
For clarities sake this is in the US but I assume things are still the same back home.
TheEnd said:
blade runner said:
Hope it's not been done before, but when out running on pavements, cycle paths etc. I keep coming across these small metal dome head bolts and flat washers sunk into the tarmac/concrete. Always a bolt and a washer together, usually slightly rusty but worn smooth. Thought maybe they were just a UK thing, but was recently running on holiday in Florida and saw a load of them there as well. Doesn't seem to be any logical spacing between them (sometimes they are miles apart, other times one a few metres from the other) so my first thought (mile/km markers) doesn't seem to stack up. Any ideas?
Survey marker bolts.http://www.sccssurvey.co.uk/10zs-centre-marker-wit...
They usually come with a little dimple in the top to stick a survey pole, and that can then be used for repeated measurement.
Boozy said:
When loading up lunch at a "salad bar" where you pay for your food by weight, I'm often plagued by which item offers the best value for money and which is the worst, does some ham/pasta which is heavy fill you up more than a load of green stuff that's lighter so you eat more but pay less?
What really throws things into chaos is that the hot food bar which contains curry, Chinese food is the same price! ($8.99 lb for each in case that helps with the diagnosis).
For clarities sake this is in the US but I assume things are still the same back home.
Is this really how you approach your diet?What really throws things into chaos is that the hot food bar which contains curry, Chinese food is the same price! ($8.99 lb for each in case that helps with the diagnosis).
For clarities sake this is in the US but I assume things are still the same back home.
No wonder we have a looming public health disaster
The car in 4th, for the same engine speed has to produce more torque to do so because the torque at the wheel is reduced due to the longer gearing and to overcome the increased rolling and air resistance because it'll be going faster.
The car in 4th burns more fuel.
I can't help but wonder at your logic?
The car in 4th burns more fuel.
I can't help but wonder at your logic?
Edited by scarble on Thursday 11th June 13:17
scarble said:
The car in 4th, for the same engine speed has to produce more torque to do so because the torque at the wheel is reduced due to the longer gearing and to overcome the increased rolling and air resistance because it'll be going faster.
The car in 4th burns more fuel.
I can't help but wonder at your logic?
Yebbut, nobbut, the car in third is going to do a lot more revolutions to cover the mile than the car in 4th.The car in 4th burns more fuel.
I can't help but wonder at your logic?
Edited by scarble on Thursday 11th June 13:17
scarble said:
The car in 4th, for the same engine speed has to produce more torque to do so because the torque at the wheel is reduced due to the longer gearing and to overcome the increased rolling and air resistance because it'll be going faster.
The car in 4th burns more fuel.
Yes, but it will also finish the mile sooner, so only if 'Fuel increase due to more torque' > 'Fuel saving due reduced run time' will the car in 4th use more for the mile.The car in 4th burns more fuel.
scarble said:
The car in 4th, for the same engine speed has to produce more torque to do so because the torque at the wheel is reduced due to the longer gearing and to overcome the increased rolling and air resistance because it'll be going faster.
The car in 4th burns more fuel.
I can't help but wonder at your logic?
By that logic, the most efficient way to drive a car would be to drive as slowly as possible (in this case 1st at 3,000rpm) and that isn't true.The car in 4th burns more fuel.
I can't help but wonder at your logic?
You want lower rpm and higher gearing typically.
Therefore for a given rpm you want the highest gear.
I can't help but wonder at your logic (not a question).
Wiki said: http://en.wikipedia.org/wiki/Energy-efficient_driv...
Because cruising at an efficient speed uses much less than the maximum power of the engine, the optimum operating point for cruising at low power is typically at very low engine speed, around or below 1000 rpm. This explains the usefulness of very high "overdrive" gears for highway cruising.
about Speed Awareness Courses.Fane said:
Would a car doing 3,000 rpm in 3rd gear use more fuel than a car doing 3,000 rpm in 4th gear over a set distance of, say, a mile?
My Speed Awareness Course provider reckoned it would use less, I think it would be more, due to the gearing, but I'm no engineer or mathematician.
I always thought manufacturers recommended shifting to a higher gear as soon as possible in order to reduce fuel consumption, implying 4th gear 3k rpm will result in lower fuel consumption. My Speed Awareness Course provider reckoned it would use less, I think it would be more, due to the gearing, but I'm no engineer or mathematician.
scarble said:
I can't help but wonder at your logic?
My non-scientific brain assumes that more revolutions of the wheels = more fuel used. On the other hand, I assume that there would be a trade off in terms of aerodynamic efficiency - the slower you go, the less you have to punch a hole in the air.Gassing Station | The Lounge | Top of Page | What's New | My Stuff