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#41
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Future of aviation, or flash in the pan??
On Tuesday, January 28, 2020 at 9:59:56 AM UTC-5, wrote:
How hard could it be? Here's an update from another skilled practitioner: http://www.streifly.de/news-e.htm |
#42
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Future of aviation, or flash in the pan??
Dave Nadler wrote on 1/31/2020 12:15 PM:
On Tuesday, January 28, 2020 at 9:59:56 AM UTC-5, wrote: How hard could it be? Here's an update from another skilled practitioner: http://www.streifly.de/news-e.htm Any idea what the "electromagnetic disturbances" are disturbing? -- Eric Greenwell - Washington State, USA (change ".netto" to ".us" to email me) - "A Guide to Self-Launching Sailplane Operation" https://sites.google.com/site/motorg...ad-the-guide-1 |
#43
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Future of aviation, or flash in the pan??
On Friday, January 31, 2020 at 7:27:53 PM UTC-5, Eric Greenwell wrote:
Any idea what the "electromagnetic disturbances" are disturbing? The Force. |
#44
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Future of aviation, or flash in the pan??
On Friday, January 31, 2020 at 7:27:53 PM UTC-5, Eric Greenwell wrote:
Dave Nadler wrote on 1/31/2020 12:15 PM: On Tuesday, January 28, 2020 at 9:59:56 AM UTC-5, wrote: How hard could it be? Here's an update from another skilled practitioner: http://www.streifly.de/news-e.htm Any idea what the "electromagnetic disturbances" are disturbing? Some controllers use Hall sensors for position sensing and phase control. Others sense back EMF generated by the motor to do the controlling. If those signals aren't "clean", not so good stuff happens. That is the "simple" explanation. UH |
#45
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Future of aviation, or flash in the pan??
On Sat, 01 Feb 2020 05:25:44 -0800, unclhank wrote:
On Friday, January 31, 2020 at 7:27:53 PM UTC-5, Eric Greenwell wrote: Dave Nadler wrote on 1/31/2020 12:15 PM: On Tuesday, January 28, 2020 at 9:59:56 AM UTC-5, wrote: How hard could it be? Here's an update from another skilled practitioner: http://www.streifly.de/news-e.htm Any idea what the "electromagnetic disturbances" are disturbing? Some controllers use Hall sensors for position sensing and phase control. Others sense back EMF generated by the motor to do the controlling. If those signals aren't "clean", not so good stuff happens. That is the "simple" explanation. UH Indeed, two problems: the above and what seems to have been an overheating problem with the original controller. A later post explains that they are switching to a better, heavier duty controller, but it is physically bigger and/or needs a different mounting system, so they have to redesign the system almost from scratch to fit everything into the fuselage. Watch this space... -- Martin | martin at Gregorie | gregorie dot org |
#46
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Future of aviation, or flash in the pan??
On Saturday, February 1, 2020 at 10:23:42 AM UTC-5, Martin Gregorie wrote:
On Sat, 01 Feb 2020 05:25:44 -0800, unclhank wrote: On Friday, January 31, 2020 at 7:27:53 PM UTC-5, Eric Greenwell wrote: Dave Nadler wrote on 1/31/2020 12:15 PM: On Tuesday, January 28, 2020 at 9:59:56 AM UTC-5, wrote: How hard could it be? Here's an update from another skilled practitioner: http://www.streifly.de/news-e.htm Any idea what the "electromagnetic disturbances" are disturbing? Some controllers use Hall sensors for position sensing and phase control. Others sense back EMF generated by the motor to do the controlling. If those signals aren't "clean", not so good stuff happens. That is the "simple" explanation. UH Indeed, two problems: the above and what seems to have been an overheating problem with the original controller. A later post explains that they are switching to a better, heavier duty controller, but it is physically bigger and/or needs a different mounting system, so they have to redesign the system almost from scratch to fit everything into the fuselage. Watch this space... -- Martin | martin at Gregorie | gregorie dot org I have gone through the same thing, abandoning one controller for another and then doing all the integration again. You can't buy experience, but you DO pay for it. UH |
#48
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Future of aviation, or flash in the pan??
kinsell wrote on 2/1/2020 8:43 AM:
On 2/1/20 9:25 AM, wrote: ... system, so they have to redesign the system almost from scratch to fit everything into the fuselage. Watch this space... -- Martin*** | martin at Gregorie* | gregorie dot org I have gone through the same thing, abandoning one controller for another and then doing all the integration again. You can't buy experience, but you DO pay for it. UH The folks on the Islander conversion project say they're doing everything with off-the-shelf components.* Can't you just run down to Grainger and pick up something suitable?* Heck there may still be one in an attic in Connecticut you could use. Adding self-launching to a single-seat sailplane (especially the small, light Libelle!) that was not designed for it is going to be a significant project, whether you are using electric, jet, or ICE. Changing propulsion systems is likely easier, which is the case in the Islander. -- Eric Greenwell - Washington State, USA (change ".netto" to ".us" to email me) - "A Guide to Self-Launching Sailplane Operation" https://sites.google.com/site/motorg...ad-the-guide-1 |
#49
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Future of aviation, or flash in the pan??
On Saturday, February 1, 2020 at 11:59:46 AM UTC-5, Eric Greenwell wrote:
kinsell wrote on 2/1/2020 8:43 AM: On 2/1/20 9:25 AM, wrote: ... system, so they have to redesign the system almost from scratch to fit everything into the fuselage. Watch this space... -- MartinÂ*Â*Â* | martin at GregorieÂ* | gregorie dot org I have gone through the same thing, abandoning one controller for another and then doing all the integration again. You can't buy experience, but you DO pay for it. UH The folks on the Islander conversion project say they're doing everything with off-the-shelf components.Â* Can't you just run down to Grainger and pick up something suitable?Â* Heck there may still be one in an attic in Connecticut you could use. Adding self-launching to a single-seat sailplane (especially the small, light Libelle!) that was not designed for it is going to be a significant project, whether you are using electric, jet, or ICE. Changing propulsion systems is likely easier, which is the case in the Islander. -- Eric Greenwell - Washington State, USA (change ".netto" to ".us" to email me) - "A Guide to Self-Launching Sailplane Operation" https://sites.google.com/site/motorg...ad-the-guide-1 They are all significant projects because of the lack of developed, compatible, proven, and documented components. A few years from now that will be a much smaller issue. UH |
#50
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Future of aviation, or flash in the pan??
Having done some industrial D.C. Drives before.....getting bits is "sorta easy", controlling it (back feed from a windmilling prop) can be another.
Then add in low volumne for our use, whole new rats nest. Even a "done deal" can be an issue as UncklHank has found on the -24E project. In his case, European time difference, lack of English as a prime language, shipping time back and forth, etc., etc.,.......figure it out. Electrifying a US sailplane from gas is a project....period..... |
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