Recent content by lengould

Or you might checkout Bombardier's new Dash8-Q400. Turboprop craft claims to go door to door faster than jets on short-to-medium routes. It's fast, almost as fast as jets. Flies high and climbs faster.

I can't believe how lacking in imagination everybody is. Where's the pioneer spirit? (I know, that's people with arrows in their backs. And no wonder, with the attitude here.)

gschjetne: Serious errors in physics re: your last para. Suggest studying harder.

Agreed that a bio-diesel could work as a jet-fuel, but as long as we're going to do a replacement, why not at least rationally investigate all the alternatives? IF liquid hydrogen tanks can be fitted onto new designs of aircraft, which I think should be do-able, (eg. take the added small...

http://planetforlife.com/h2/h2fuelcell.html HHV LHV Difference Hydrogen 142 MJ/kg *120 MJ/kg 0.18 Natal Gas 38 MJ/kg *35 MJ/kg 0.08 Gasoline 35 MJ/kg *32 MJ/kg 0.11 In all my comparisons I was using LHV, eg. 120/34 = 3.529 . Is 34 valid for LHV jet fuel? In general I agree with...

Thanks a lot for the input, all. It is at least encouraging to see no-one has yet flatly stated "it's impossible, we tried it", which is one of the things I am looking for.

On tankage. All those quotes in your post are based on current use metal tanks which are basically derived from stationary tanks which have no need for mass ratio optimization, and show it. Eg. Chart Industries http://www.chart-ind.com/pdf/10888322.pdf However, stating something is impossible...

The idea of the walls is to have the highest ratio possible of fiber v.s. resin so the cross section should be very constant, if that means uniformly distributed. I was planning multiple layers of a very (low filament count)/(low section diameter) continuous end-to-end fiber wound in alternate...

I'm hoping someone could give me a quick feasibility evaluation of an idea, as I don't have access to a lot of engineering texts or money to hire the work. What I'm looking for is a means to calculate the mechanical load-carrying ability of a large diameter very thin wall composite tube or...

With 3.5 times more energy per kg than jet fuel, liquid hydrogen should be the perfect aviation fuel, and likely very soon will be given recent steep increases in petroleum. Only remains to come up with an economic source, although already a couple of methods of production are very close to...

In general a stiff stance against plagarism is justified primarily because it forces undergrads to actually research the topics on which they write. Any incidental benefit from pointing out cheating is an additional but not primary gain.

Where does seafood fit in, (eg. insect equivalents from water such as lobster, shellfish, crabs)? If I am to exempt these from my diet on moral grounds, then mustn't I also follow th Jainist principle of protecting every insect as well? I've watched vegan-ism etc. from the sidelines for a...

I've seem this argument sorted out several places, and have concluded that the DOE's energy ratio of 1.24 is about accurate for ethanol from corn. I also think there's no new developments anticipated or being investigated here, and therefore this process justifies no further subsidies of any...

At the risk of being in the wrong thread, here goes: I've been haunting the (limited, for me) avail. literature and physics forums looking for the answer to a question relevant to some posts here re: eg "I've performed thousands of experiments involving homopolar, unipolar, and acyclic...