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Path: ...!Xl.tags.giganews.com!local-2.nntp.ord.giganews.com!nntp.supernews.com!news.supernews.com.POSTED!not-for-mail NNTP-Posting-Date: Thu, 18 Jul 2024 20:49:45 +0000 From: john larkin <jlarkin_highland_tech> Newsgroups: sci.electronics.design Subject: Re: Solar powered electrostatic motor drone ?? Date: Thu, 18 Jul 2024 13:49:44 -0700 Message-ID: <vtvi9jlcaqteedbj7rj5av6cn2vqna37as@4ax.com> References: <v7aa84$uec$1@solani.org> <v7an81$2bq7t$1@dont-email.me> <1qwwjrq.1j72zdkfee00kN%liz@poppyrecords.invalid.invalid> <v7bipr$2gsi9$1@dont-email.me> <86oi9j9sojojf8qinhranoclb3mpoaj5ag@4ax.com> <v7bq60$2i1n7$1@dont-email.me> User-Agent: ForteAgent/8.00.32.1272 MIME-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 8bit Lines: 55 X-Trace: sv3-aWOWO+WmSvFBXPEnr9d44WJGSEG9WmMKvCTdm9ac68xIbwnw2KbFEN0d/YnLmNSGeXPEtW/KcP1YAc1!KnuzhVqEcieODwNhz/QxSk8GjSNFJdJD97vkSInX/4m9NJ+Hm5Vb+RhR/EML993p0bZSVRSpYPsA!Rd+wkA== X-Complaints-To: www.supernews.com/docs/abuse.html X-DMCA-Complaints-To: www.supernews.com/docs/dmca.html X-Abuse-and-DMCA-Info: Please be sure to forward a copy of ALL headers X-Abuse-and-DMCA-Info: Otherwise we will be unable to process your complaint properly X-Postfilter: 1.3.40 Bytes: 3379 On Thu, 18 Jul 2024 21:27:19 +0200, Jeroen Belleman <jeroen@nospam.please> wrote: >On 7/18/24 20:39, john larkin wrote: >> On Thu, 18 Jul 2024 19:21:23 +0200, Jeroen Belleman >> <jeroen@nospam.please> wrote: >> >>> On 7/18/24 18:42, Liz Tuddenham wrote: >>>> Jeroen Belleman <jeroen@nospam.please> wrote: >>>> >>>>> On 7/18/24 07:46, Jan Panteltje wrote: >>>>>> Researchers build ultralight drone that flies with onboard solar Bizarre >>>>>> design uses a solar-powered motor that's optimized for weight. >>>>>> https://arstechnica.com/science/2024/07/researchers-build-ultralight-dro >>>>>> ne-that-flies-with-onboard-solar/ >>>>>> >>>>>> Well, ehh, unlimited flight time if any sun.. >>>>>> Looks funny. >>>>>> 4.5V to 9 kV power converter... >>>>> >>>>> I wonder if electrostatic motors would have been as practical >>>>> as electromagnetic motors if the history of motor design had >>>>> taken a different turn a century or two ago. >>>> >>>> I think Philips dabbled with them many decades ago. A report will be >>>> somewhere in the Philips Technical Review. >>>> >>>> >>> >>> Thanks for that hint. The Philips Technical Review is a treasure >>> trove of interesting stuff. >>> >>> I found a paper by B. Boll�e on electrostatic motors: >>> <https://pearl-hifi.com/06_Lit_Archive/02_PEARL_Arch/Vol_16/Sec_53/Philips_Tech_Review/PTechReview-30-1969-178.pdf>. >>> >>> Jeroen Belleman >>> >> >> I wonder how many orders of magnitude an electrostatic motor is worse >> than a magnetic motor, in some criterion like power per volume or >> power per dollar. 6 maybe? >> > >It's not so easy to tell. Electromagnetic motors have benefitted from >a long and intense process of optimization, both for performance and >for ease of manufacturing. Throwing some ballpark guesses at a possible >realization of a 1kW electrostatic motor, I got a motor volume greater >than an electromagnetic motor, to be sure, but not hugely so. One or >two orders of magnitude perhaps. Certainly not six. > >Jeroen Belleman One source says that "Benjamin Franklin invented the first electrostatic motor in 1748."