Things you always wanted to know the answer to [Vol. 3]
Discussion
98elise said:
torqueofthedevil said:
Do plans taxi around the airport using their jet engines / propellers as a means of driving back and forwards?
Almost certain they dont have motors to power the wheels but surely the laws of physics dictates that to push a for example and jumbo forward the engines have to be pushing back with similar force? Wouldn't that just blow everything behind it away?
They use their engines. They are creating thrust rearwards, therefore the plane moves forward. No different to when they fly (just less thrust)Almost certain they dont have motors to power the wheels but surely the laws of physics dictates that to push a for example and jumbo forward the engines have to be pushing back with similar force? Wouldn't that just blow everything behind it away?
They are generally pushed backwards by another vehicle (no idea what its called though).
) but most airlines now use single engine taxi in on narrowbody twins to avoid fuel burn. Perfectly safe, just means a bit of differential braking.Several companies are trying to do electric "green taxiing" systems. The amount of fuel and CO2 wasted at congested airports is phenomenal. Two schools of thought:
1. Taxi bot takes the aircraft to a runway holding point then detaches and picks up an inbound.aircraft. This requires a step change in airport operations management.
2. Aircraft has electric motors installed on the wheels (favoured on main rather than nose wheels) to provide the motive force. Problem is it requires an upgraded APU to deliver the electric power required, seriously heavy duty wiring and today's motor tech still isn't mature enough on power/weight ratio. Once airborne you are carrying dead weight so fuel savings (particularly on longhaul) become negative. Business cases I've seen on current technology only break even at $1300 per ton for Jet-A1 and its currently in the $800's.
In either case it is the way forward for environmental reasons and when fuel/implementation costs converge it'll start to work.
Edited by Speed 3 on Thursday 10th September 11:07
walm said:
torqueofthedevil said:
Do plans taxi around the airport using their jet engines / propellers as a means of driving back and forwards?
Almost certain they dont have motors to power the wheels but surely the laws of physics dictates that to push a for example and jumbo forward the engines have to be pushing back with similar force? Wouldn't that just blow everything behind it away?
100% right.Almost certain they dont have motors to power the wheels but surely the laws of physics dictates that to push a for example and jumbo forward the engines have to be pushing back with similar force? Wouldn't that just blow everything behind it away?
227bhp said:
There is some footage around where people were purposely standing behind the aircraft only to be blown away when it throttled back ready for take off.
When I started in aviation we were shown a ground safety video (or may have been cine film back then....) which was based around true events. One guy had been seriously injured when the Transit he was driving got caught in jetwash and it blew it straight over. Driving airside requires great care and attention. Boundary fences are usually a safe distance from runway threshold to keep Joe Public safe. One industry where sticking to the rules is vital and it does have an excellent safety record on ground and in air because everyone working in it (with very few exceptions) absolutely understands what they need to do and more importantly what not to do.
There's going to be a big "super silent" generator tucked away around a corner.
Something like this-
That'll run cables to some distribution boxes and everything will be hidden away
Spiders are like fish, everyone will always tell you they had one bigger.
Something like this-
That'll run cables to some distribution boxes and everything will be hidden away
LordGrover said:
How big do regular, run of the mill British spiders get?
Saw this chicken under the stairs last night, and to me he looks a whopper but I'm guessing they can get bigger?
That's close to the maximum size. I did come across an unusually large one a few weeks ago, took a pic, but since there were nothing to get a sense of scale, it was a little pointless.Saw this chicken under the stairs last night, and to me he looks a whopper but I'm guessing they can get bigger?
Spiders are like fish, everyone will always tell you they had one bigger.
marshalla said:
Funkycoldribena said:
Hugo a Gogo said:
plugs, cables, electricity. maybe some gas
Well thanks for clearing that up.Seriously though,theres no sign or noise of any generators.
Hugo a Gogo said:
is it in the middle of nowhere then? I thought it was just in a garden...
Welcome to Welford Park: home of the Great British Bake Offoceanview said:
Noticing all the electricity pylons dotted throughout the fields of the land, does the landowner get a payment (one-off/regular) for having the pylon on there land?
A small annual ground rent payment.My old Scouts group had a substation on their land and got a few bob from the electricity board every year.
rohrl said:
oceanview said:
Noticing all the electricity pylons dotted throughout the fields of the land, does the landowner get a payment (one-off/regular) for having the pylon on there land?
A small annual ground rent payment.My old Scouts group had a substation on their land and got a few bob from the electricity board every year.
MissChief said:
rohrl said:
oceanview said:
Noticing all the electricity pylons dotted throughout the fields of the land, does the landowner get a payment (one-off/regular) for having the pylon on there land?
A small annual ground rent payment.My old Scouts group had a substation on their land and got a few bob from the electricity board every year.
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