Any mechanical engineers in the haus? Help requested!

[bogan]

I'm not sure what's worse, incoherent ranting greenies or incoherent anti-greenie ranting...

well i always go for both angles, incoherently ranting at greenies and the anit-greenies, what really gets my goat is vegetarians who drive suvs or people who use solar powered bbqs, you can't stand round them having a beer and a good yard, too fucking shiny init.

[schrodingers cat]

I'm not sure what's worse, incoherent ranting greenies or incoherent anti-greenie ranting...

There is a very real question in here darling. Care to try to exercise your brain?

[bogan]

There is a very real question in here darling. Care to try to exercise your brain?

bit of an open ended question isn't it, efficiency as in total work in / total work out doesn't really apply as your food has to be grown before it is 'picked', whereas oil is out there ripe for the 'picking' as is

bottom line is its humans that are overusing all the resources, doesnt matter how efficient your shit is, too many is still too many.

[motorbyclist]

Well in terms of 'pumping losses', a normal engine has those anyway, and if everything were perfect, the rear cylinder pumping full capacity every cycle and then that being solely fed into the front cylinder would result in the same total airflow, with the same total 'pumping loss' with the same total output power because the same total petrol is being burned.

......

All in all, an interesting exercise but I would have expected an engineer student to be a bit more in tune with people doing things like this 'because they can'.

a normal engine isn't fighting 40bar except for when it's producing power. their one goes from two cylinders pumping and producing power, to (effectively) three with two fighting a very high head, being driven by only one!

without the reservior it's just an exercise in reducing efficiency

it would be an interesting project if it made the bike better.

in my view, it didn't, and they're going to be ripping off the 40 customers who buy these bikes....

maybe i just don't like ducati motors, if they did it to my favourite V4 and did a fair power comparison i'd still have a go at them for ruining a perfectly good V4....

bottom line is its humans that are overusing all the resources, doesnt matter how efficient your shit is, too many is still too many.

or rather too much is too much; americans/australians use far more per capita than other developed nations (we aren't that good ourselves, mind you).

biggest irony in energy efficiency is that it results in higher overall energy consumption. it's kinda like how having more shelves just means you find more stuff to fill it - using less energy just gives you more money to spend on other ways to consume energy or use the more efficient device in a more wasteful way.

ie not turning energy efficient bulbs off because "it still works out cheaper" and using the money you saved to go do a coro loop instead

[bogan]

ie not turning energy efficient bulbs off because "it still works out cheaper" and using the money you saved to go do a coro loop instead

where you have to run bout 80w of lighting anyway, negating any energy gains befor you even take the kinetics into account! though i did find out recently that you can just run running lights instead of a headlight under the new law

[schrodingers cat]

Actually it is all a solar cycle. Oil also is biomass that was grown and is in effect 'stored' solar energy.

My point is that methods of transportation seldomn get an apples/apples comparison

Your closing staement is well intentioned but a generalisation. Poor position for as engineer to take when trying to strike the death blow

[bogan]

Actually it is all a solar cycle. Oil also is biomass that was grown and is in effect 'stored' solar energy.

My point is that methods of transportation seldomn get an apples/apples comparison

Your closing staement is well intentioned but a generalisation. Poor position for as engineer to take when trying to strike the death blow

my point was that its too hard to do a proper comparison, you asked the question so kinda renders your point confusing i'm also confused by the 'death blow' thing, I am an engineer, but an unbiased one who calls it how he sees it.

Unless of course you weren't refering to my post in which case, or even if you were, quote button is good

[schrodingers cat]

I realise that because there are so many variables the question is difficult.

Have you ever wondered tho? Or is all human energy considered 'free'

[jono035]

Maybe the lentil eating (methane farting) treddly greenies should shut the fuck up about how great the bicycle is. After all - the majority of bicycles aren't carved from wood are they? There is a whole industry supporting bicycles - just like cars and motorcycles.
It is a product of the industrial revolution with all its inherant problems.

I think you guys are just feeding a troll, to be honest. I'm staying out of this, I don't need the blood-pressure-spike.

[bogan]

I realise that because there are so many variables the question is difficult.

Have you ever wondered tho? Or is all human energy considered 'free'

its considered renewable, which is important for the greenies. And more interesting than trying to figure out the relative efficiencies is considering the implications

I think you guys are just feeding a troll, to be honest. I'm staying out of this, I don't need the blood-pressure-spike.

meh, i need a diversion from trying to get my link geometry to work, tis not going well

[jono035]

meh, i need a diversion from trying to get my link geometry to work, tis not going well

Fair enough, I find my brain works better when I take some time away from banging my head against brick walls, though

[bogan]

Fair enough, I find my brain works better when I take some time away from banging my head against brick walls, though

something must have worked, got it sorted now i think,hope it works in practice though

[jono035]

something must have worked, got it sorted now i think,hope it works in practice though

Hahaha good stuff...

[motorbyclist]

Fair enough, I find my brain works better when I take some time away from banging my head against brick walls, though

and that's why i go through so much coffee

[avgas]

Which energy source is more efficient in a total sense - 100 000 calories of diesel or 100 000 calories of food?

Very simple actually - if you burn 100KCal of Diesel, you receive it all in 1 burst. Where if you eat it all, you use some and store the rest.
Very smart TDi does this to an extent, it has stored diesel, and only uses what it can depending on what it knows.
So does this make one better than the other - nope.
Efficiency is a wonderful thing - its absolutely fucking useless without a system.
Otherwise everything is 100% efficient as you should never lose energy, it just changes.