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Groups > sci.physics.relativity > #617340
| From | Sylvia Else <sylvia@email.invalid> |
|---|---|
| Newsgroups | sci.physics.relativity |
| Subject | Re: too easy? |
| Date | 2023-08-11 11:40 +1000 |
| Message-ID | <kjlhtbFk5frU1@mid.individual.net> (permalink) |
| References | <e6f71497-0cf3-4020-a9ab-b5da1b008039n@googlegroups.com> |
On 10-Aug-23 10:17 am, nero wrote: > I should like to know the theoric energy in kwh necessary for keeping in air a kg for an hour ... > It is the problem of all the birds , drones, plains , helicopters..... > It is the number for calculating the efficienty of the fligth The answer is that there is no theoretical minimum. It's an engineering problem that seeks to balance structural weight, friction, generation of turbulence resulting in drag, and so on. Sylvia.
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too easy? nero <oldogf@yahoo.it> - 2023-08-09 17:17 -0700
Re: too easy? whodat <whodaat@void.nowgre.com> - 2023-08-09 20:51 -0500
Re: too easy? whodat <whodaat@void.nowgre.com> - 2023-08-09 21:48 -0500
Re: too easy? nero <oldogf@yahoo.it> - 2023-08-10 16:45 -0700
Re: too easy? nero <oldogf@yahoo.it> - 2023-08-10 16:48 -0700
Re: too easy? nospam@de-ster.demon.nl (J. J. Lodder) - 2023-08-10 11:37 +0200
Re: too easy? nero <oldogf@yahoo.it> - 2023-08-10 16:52 -0700
Re: too easy? nospam@de-ster.demon.nl (J. J. Lodder) - 2023-08-11 12:53 +0200
Re: too easy? nero <oldogf@yahoo.it> - 2023-08-10 16:54 -0700
Re: too easy? RichD <r_delaney2001@yahoo.com> - 2023-08-12 12:01 -0700
Re: too easy? whodat <whodaat@void.nowgre.com> - 2023-08-12 14:16 -0500
Re: too easy? Volney <volney@invalid.invalid> - 2023-08-12 17:31 -0400
Re: too easy? nospam@de-ster.demon.nl (J. J. Lodder) - 2023-08-13 10:34 +0200
Re: too easy? nospam@de-ster.demon.nl (J. J. Lodder) - 2023-08-13 10:34 +0200
Re: too easy? nero <oldogf@yahoo.it> - 2023-08-13 18:19 -0700
Re: too easy? nospam@de-ster.demon.nl (J. J. Lodder) - 2023-08-14 10:30 +0200
Re: too easy? RichD <r_delaney2001@yahoo.com> - 2023-08-15 10:17 -0700
Re: too easy? Athel Cornish-Bowden <athel.cb@gmail.com> - 2023-08-15 21:02 +0200
Re: too easy? nospam@de-ster.demon.nl (J. J. Lodder) - 2023-08-15 23:38 +0200
Re: too easy? RichD <r_delaney2001@yahoo.com> - 2023-08-16 09:25 -0700
Re: too easy? Prokaryotic Capase Homolog <prokaryotic.caspase.homolog@gmail.com> - 2023-08-16 09:47 -0700
Re: too easy? Paul Alsing <pnalsing@gmail.com> - 2023-08-16 17:51 -0700
Re: too easy? nospam@de-ster.demon.nl (J. J. Lodder) - 2023-08-17 09:45 +0200
Re: too easy? patdolan <patdolan@comcast.net> - 2023-08-17 11:31 -0700
Re: too easy? Tom Roberts <tjoberts137@sbcglobal.net> - 2023-08-17 13:03 -0500
Re: too easy? Sylvia Else <sylvia@email.invalid> - 2023-08-11 11:40 +1000
Re: too easy? nospam@de-ster.demon.nl (J. J. Lodder) - 2023-08-11 12:53 +0200
Re: too easy? Prokaryotic Capase Homolog <prokaryotic.caspase.homolog@gmail.com> - 2023-08-11 11:02 -0700
Re: too easy? patdolan <patdolan@comcast.net> - 2023-08-11 11:33 -0700
Re: too easy? nospam@de-ster.demon.nl (J. J. Lodder) - 2023-08-11 21:01 +0200
Re: too easy? nospam@de-ster.demon.nl (J. J. Lodder) - 2023-08-11 20:54 +0200
Re: too easy? Prokaryotic Capase Homolog <prokaryotic.caspase.homolog@gmail.com> - 2023-08-11 14:38 -0700
Re: too easy? nospam@de-ster.demon.nl (J. J. Lodder) - 2023-08-12 12:07 +0200
Re: too easy? nero <oldogf@yahoo.it> - 2023-08-18 18:38 -0700
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