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

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

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.

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

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

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

On 2/1/20 9:25 AM, wrote:
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


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.

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

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

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.....