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Search: Posts Made By: ron_van_sommeren
Forum: Brushless Motor Construction 01-22-2016, 11:58 AM
Replies: 47
Views: 17,358
Posted By ron_van_sommeren
Several rewinders test their rewinds with...

Several rewinders test their rewinds with 1000volt, a.o. Bert Dekker over at HFF...
Forum: Brushless Motor Construction 01-21-2016, 11:13 PM
Replies: 47
Views: 17,358
Posted By ron_van_sommeren
This Measuring Brushless Motor Resistance (Two...

This Measuring Brushless Motor Resistance (Two Digital Meter Method) thread/method added to opening post in item #33 of
Sticky: (Re)winding and building motors, tips & tricks, checks & tests...
Forum: General RC E-Heli Talk 01-05-2016, 01:03 PM
Replies: 16
Views: 609
Posted By ron_van_sommeren
One death in the USA, one in Switzerland that...

One death in the USA, one in Switzerland that year.
Forum: Brushless Motor Construction 01-01-2016, 08:56 PM
Replies: 1
Views: 288
Posted By ron_van_sommeren
Coaxial contrarotating, with custom made laminations

It's been a while since whe've seen a motor-design/built completely from scratch, in this case for a Daimler Benz DB Jäger (http://www.rcgroups.com/forums/showthread.php?t=1510248), and it includes...
Forum: General Electric Discussions 12-24-2015, 04:37 PM
Replies: 10
Views: 484
Posted By ron_van_sommeren
Kv and Imax would do it. But because...

Kv and Imax would do it.

But because manufacturers/shops insist on incorrectly writing 1000Kv instead of Kv=1000rpm/volt, lots of (all?) newbies think Kv has something to do with power a motor can...
Forum: Video Parking lot 12-21-2015, 07:29 PM
Replies: 8
Views: 184
Posted By ron_van_sommeren
My sound and vision favourite, tickles my...

My sound and vision favourite, tickles my hydraulic system ;)
P-51 Galloping Ghost with 3 cylinder inline www.kolmengines.com...
Forum: Power Systems 11-06-2014, 07:52 PM
Replies: 20
Views: 1,950
Posted By ron_van_sommeren
FIY, Hyperion motors and controllers with a 's',...

FIY, Hyperion motors and controllers with a 's', are/were made by www.scorpionsystem.com
Forum: General Electric Discussions 11-03-2014, 01:55 PM
Replies: 6
Views: 477
Posted By ron_van_sommeren
Since it came with NiCd/NiMH, does the ESC have a...

Since it came with NiCd/NiMH, does the ESC have a LVC? (low voltage cut-off to protect LiPo)
Forum: General Electric Discussions 11-02-2014, 09:46 PM
Replies: 6
Views: 477
Posted By ron_van_sommeren
Motorcurrent wants to go up with voltage squared...

Motorcurrent wants to go up with voltage squared (and with Kv cubed).
In this case be factor (11.1/8.4)² = 1,9! Worst case, ignoring bit of voltage sag due to increase in current.
Forum: Power Systems 10-31-2014, 05:19 PM
Replies: 4
Views: 586
Posted By ron_van_sommeren
Videos www.innov8tivedesigns.com -> resources...

Videos
www.innov8tivedesigns.com
-> resources
-> video classroom
-> How to remove a stuck outrunner bearing
&
-> How to change outrunner bearings ...
Forum: Power Systems 10-23-2014, 04:05 PM
Replies: 24
Views: 10,449
Posted By ron_van_sommeren
And a contrarotating prop by itself is already...

And a contrarotating prop by itself is already (very) noisy, for the same 'siren' reason.

Place motor higher or lower than trailing edge, that way the prop will 'slice' across the trailing edge,...
Forum: Beginners 10-15-2014, 01:36 PM
Replies: 12
Views: 1,126
Posted By ron_van_sommeren
For a rainy day(s) E-flight 101 by RCG...

For a rainy day(s)

E-flight 101 by RCG member Ken Myers, will at least save you a ruined LiPo (or worse!), a burnt motor and a fried ESC:
The Ampeer (http://www.theampeer.org/framesefo.html)
->...
Forum: Brushless Motor Construction 10-14-2014, 02:18 PM
Replies: 4
Views: 1,143
Posted By ron_van_sommeren
Forum Title: Brushless Motor Construction ...

Forum Title: Brushless Motor Construction
Subtitle: Discuss design and construction of custom Brushless motors
Forum: Brushless Motor Construction 10-14-2014, 02:17 PM
Replies: 6
Views: 821
Posted By ron_van_sommeren
ForumTitle: Brushless Motor Construction ...

ForumTitle: Brushless Motor Construction
Subtitle: Discuss design and construction of custom Brushless motors
Forum: General Electric Discussions 10-08-2014, 08:08 PM
Replies: 13
Views: 1,068
Posted By ron_van_sommeren
http://www.modelbouwforum.nl/forums/images/smilies...

http://www.modelbouwforum.nl/forums/images/smilies/thumbsup.gif

I know of one Dutch motor (re)winder who tests insulation breakdown voltage after (re)winding with 500 (1000?) volt.
His high(er)...
Forum: General Electric Discussions 10-08-2014, 01:40 PM
Replies: 13
Views: 1,068
Posted By ron_van_sommeren
The Kv constant is not a rating Mark, not a...

The Kv constant is not a rating Mark, not a figure of merit, it's just a characteristic. More windings will give lower Kv, less windings will give higher Kv, that's all there is to it. No big deal,...
Forum: General Electric Discussions 10-08-2014, 01:31 PM
Replies: 13
Views: 1,068
Posted By ron_van_sommeren
Nah, if all e-beginners would read that, several...

Nah, if all e-beginners would read that, several motor- and controller-manufacturers would go belly up :D
Your e-flight FAQ/introduction and a watt-meter, must have's :)
Forum: General Electric Discussions 10-04-2014, 06:36 PM
Replies: 12
Views: 764
Posted By ron_van_sommeren
What current did you measure?

What current did you measure?
Forum: General Electric Discussions 10-04-2014, 02:40 PM
Replies: 12
Views: 764
Posted By ron_van_sommeren
1 - Neodymium magnets start to weaken...

1 - Neodymium magnets start to weaken (permanent!) above 80°C. Weaker magnets result in a higher Kv.
2 - Motorcurrent wants to go up with Kv cubed, and with voltage squared (way more/faster than one...
Forum: Power Systems 09-28-2014, 04:45 PM
Replies: 61
Views: 2,949
Posted By ron_van_sommeren
And too long battery wires will kill ESC over...

And
too long battery wires will kill ESC over time: precautions, solutions & workarounds - RCG (http://www.rcgroups.com/forums/showthread.php?t=952523)
Forum: Electronic Builders Workshop 09-19-2014, 11:53 PM
Replies: 13
Views: 1,199
Posted By ron_van_sommeren
Sticky: e-flight calculators (compilation)...

Sticky: e-flight calculators (compilation) (http://www.rcgroups.com/forums/showthread.php?t=606703)

Notably Drive Calculator, Scorpion Calc and derivatives, E-Calc. E-Calc is not freeware.

FAQ...
Forum: Electronic Builders Workshop 09-19-2014, 01:55 AM
Replies: 13
Views: 1,199
Posted By ron_van_sommeren
Sorry Fred, I did not mean do belittle you (or...

Sorry Fred, I did not mean do belittle you (or other people in the past), but how would someone less motor-knowledgable then you and I interpret this quote? I don't want TS to get the wrong idea,...
Forum: Electronic Builders Workshop 09-19-2014, 01:12 AM
Replies: 13
Views: 1,199
Posted By ron_van_sommeren
The Kv constant is not a rating, not a figure of...

The Kv constant is not a rating, not a figure of merit, it's just a characteristic. More windings will give lower Kv, less windings will give higher Kv, that's all there is to it. No big deal, anyone...
Forum: Brushless Motor Construction 09-18-2014, 01:32 PM
Replies: 20
Views: 1,383
Posted By ron_van_sommeren
Art, if I were you, I'd remove/mutilate your...

Art, if I were you, I'd remove/mutilate your e-mail address in your signature, before the spammers find you: art curl rc-wingman dot com.
People can use the forum private messages...
Forum: Scratch and Kit Built Aircraft 09-06-2014, 04:28 PM
Replies: 18
Views: 1,608
Posted By ron_van_sommeren
www.rbckits.com

www.rbckits.com
Forum: Batteries & Chargers 08-21-2014, 09:39 PM
Replies: 7
Views: 870
Posted By ron_van_sommeren
Charger tests, including the 206B ...

Charger tests, including the 206B
translate...www.elektromodellflug.de...
Forum: Batteries & Chargers 08-19-2014, 02:48 AM
Replies: 7
Views: 870
Posted By ron_van_sommeren
For playing a bit with the currentlimits for...

For playing a bit with the currentlimits for chargers, for given number of cells, per type/make
www.scriptasylum.com (http://www.scriptasylum.com/)
-> RC calculations...
Forum: Power Systems 08-11-2014, 01:37 AM
Replies: 1
Views: 387
Posted By ron_van_sommeren
Try the Electronic Builders Workshop...

Try the Electronic Builders Workshop (http://www.wattflyer.com/forums/forumdisplay.php?f=32) subforum.
Forum: Power Systems 08-06-2014, 12:11 PM
Replies: 3
Views: 448
Posted By ron_van_sommeren
Keep in mind Brian that ... The Kv constant...

Keep in mind Brian that ...

The Kv constant is not a rating, not a figure of merit, it's just a characteristic. More windings will give lower Kv, less windings will give higher Kv, that's all...
Forum: Power Systems 08-06-2014, 12:07 AM
Replies: 9
Views: 594
Posted By ron_van_sommeren
What about helicopters then? Both motor and rotor...

What about helicopters then? Both motor and rotor shaft are vertical instead of horizontal. Not to mention belt reduction versus gear reduction and single stage versus double stage reduction. And...
Showing results 1 to 30 of 500

 
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