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Search: Posts Made By: ron_van_sommeren
Forum: Power Systems Yesterday, 12:02 PM
Replies: 10
Views: 152
Posted By ron_van_sommeren
Keep in mind that ... A motors Kv constant...

Keep in mind that ...

A motors Kv constant says nothing about max.power, max.current, efficiency, rpm, quality etc. (http://www.rcgroups.com/forums/showthread.php?t=2131492)
The Kv constant...
Forum: Power Systems 07-26-2014, 01:25 PM
Replies: 10
Views: 152
Posted By ron_van_sommeren
This is the Brushless Motor Construction...

This is the Brushless Motor Construction (http://www.wattflyer.com/forums/forumdisplay.php?f=88) subforum. You'll get more viewers/answers in the Power Systems...
Forum: Off Topic Chit Chat 07-23-2014, 01:49 PM
Replies: 12
Views: 273
Posted By ron_van_sommeren
Lovely engines. What's the colour coating...

Lovely engines. What's the colour coating material in the cylinder heads Chellie?

BTW I have read about brake fluid as cleaner.
Forum: Beginners 07-19-2014, 06:31 PM
Replies: 10
Views: 175
Posted By ron_van_sommeren
Lucien Miller (Scorpion USA...

Lucien Miller (Scorpion USA (http://http://www.innov8tivedesigns.com)) about derating (http://https://en.wikipedia.org/wiki/Derating) for motors, controllers, batteries and electronics, starting at...
Forum: Off Topic Chit Chat 07-16-2014, 12:31 PM
Replies: 55
Views: 1,595
Posted By ron_van_sommeren
RCG made a mistake, they corrected it, all 25 of...

RCG made a mistake, they corrected it, all 25 of them ;), with the help of people in this WFF thread.
Everybody happy :)

I cannot reply in Nigel's RCG thread, otherwise I would have mentioned it...
Forum: Off Topic Chit Chat 07-15-2014, 11:04 PM
Replies: 55
Views: 1,595
Posted By ron_van_sommeren
25 messages from RCG :) Boldface by me. ...

25 messages from RCG :)
Boldface by me.

Again, thank you guys&girls for your support and pats on the back.
Forum: Off Topic Chit Chat 07-15-2014, 01:00 PM
Replies: 55
Views: 1,595
Posted By ron_van_sommeren
Thank you guys&girls, and notably Nigel :) ...

Thank you guys&girls, and notably Nigel :)

Posting identical messages in response to similar (opening) posts is not cross-posting. I had already reported dailydigitaldeals spam several times,...
Forum: Off Topic Chit Chat 07-14-2014, 12:40 PM
Replies: 55
Views: 1,595
Posted By ron_van_sommeren
got permanent ban on RCG

I can't even appeal anymore.
25 'reasons' (http://www.rcgroups.com/forums/search.php?do=finduser&u=3018) for my permanent ban:
www.rcgroups.com/forums/search.php?do=finduser&u=3018...
Forum: General Electric Discussions 06-30-2014, 10:31 PM
Replies: 11
Views: 307
Posted By ron_van_sommeren
www.aircraft-world.com a.k.a. David Radford

www.aircraft-world.com a.k.a. David Radford
Forum: General Electric Discussions 06-21-2014, 05:40 PM
Replies: 7
Views: 206
Posted By ron_van_sommeren
Charge/discharge rates as a function of #cells ...

Charge/discharge rates as a function of #cells
www.scriptasylum.com (http://www.scriptasylum.com)
-> RC calculationshttp://www.scriptasylum.com/images/rccalculations.jpg...
Forum: Power Systems 06-19-2014, 12:43 PM
Replies: 17
Views: 371
Posted By ron_van_sommeren
And even KISSER i.e. if you want to use a...

And even KISSER i.e. if you want to use a separate battery:
4NiMH or 2LiFe
Forum: General Electric Discussions 06-17-2014, 11:18 PM
Replies: 8
Views: 233
Posted By ron_van_sommeren
Not the only thing(s) I have lost since my...

Not the only thing(s) I have lost since my previous picture was taken :D On the bright side, I gained a bit of forehead
Forum: General Electric Discussions 06-17-2014, 10:52 PM
Replies: 8
Views: 233
Posted By ron_van_sommeren
Don't play with throttle when this occurs, you...

Don't play with throttle when this occurs, you may burn motor and/or controller.
Forum: Brushless Motor Construction 06-17-2014, 08:15 PM
Replies: 72
Views: 6,500
Posted By ron_van_sommeren
Chamfer (bevel? what's the difference?) the edges...

Chamfer (bevel? what's the difference?) the edges with a file a bit before winding.
Forum: Batteries & Chargers 06-15-2014, 05:37 PM
Replies: 9
Views: 314
Posted By ron_van_sommeren
I know you know :) but I'm always a bit...

I know you know :) but I'm always a bit (over)cautious with regards to beginners. Especially when (dis)charging is the topic.
Forum: Batteries & Chargers 06-15-2014, 02:11 PM
Replies: 9
Views: 314
Posted By ron_van_sommeren
You were to fast there, two typos: mAh (unit of...

You were to fast there, two typos: mAh (unit of capacity) should be mA (unit of current).
Seems a bit over the top for a beginner. What batteries do you want to charge, voltage and capacity?
Forum: Power Systems 06-13-2014, 07:38 PM
Replies: 3
Views: 171
Posted By ron_van_sommeren
Power Systems - RCG...

Power Systems - RCG (http://www.rcgroups.com/power-systems-13/)
-> Sticky: e-flight calculators (compilation) (http://www.rcgroups.com/forums/showthread.php?t=606703)



But ... when just...
Forum: Brushless Motor Construction 06-13-2014, 05:21 PM
Replies: 36
Views: 2,344
Posted By ron_van_sommeren
Kv_delta = 1.75 × Kv_star Kv_star = Kv_delta /...

Kv_delta = 1.75 × Kv_star
Kv_star = Kv_delta / 1.75

Double voltage and motor/battery current wants to quadruple (2×2). An n% increase in voltage will give a 2×n% increase in current.
Double Kv...
Forum: Power Systems 06-13-2014, 05:13 PM
Replies: 7
Views: 204
Posted By ron_van_sommeren
To be honest Denny, I had already reported that...

To be honest Denny, I had already reported that post before asking you about it here. Within 10minutes it was moved to the RCG bitbucket (http://www.rcgroups.com/bit-bucket-252/).
It's not the first...
Forum: Power Systems 06-13-2014, 04:25 PM
Replies: 7
Views: 204
Posted By ron_van_sommeren
I take it this is not you Denny? First post, and...

I take it this is not you Denny? First post, and you already had your anser from Nigel
www.rcgroups.com/forums/showthread.php?t=2185474

Prettig weekend ;) Ron
Forum: Batteries & Chargers 06-13-2014, 03:07 PM
Replies: 26
Views: 722
Posted By ron_van_sommeren
Comparing charger limits, max.current goes down...

Comparing charger limits, max.current goes down as #cells goes up!, and power supplies
www.scriptasylum.com (http://www.scriptasylum.com/)
-> RC calculations...
Forum: Power Systems 06-13-2014, 02:46 PM
Replies: 7
Views: 204
Posted By ron_van_sommeren
Kontronik lists them as 5kW continuous power...

Kontronik lists them as 5kW continuous power Denny
Kontronik - Pyro 800 series...
Forum: Beginners 06-10-2014, 05:56 PM
Replies: 7
Views: 236
Posted By ron_van_sommeren
By max.current, it is a better indicator than...

By max.current, it is a better indicator than max. power. AND by Kv.

The Kv constant (motors have just one Kv, not 180Kv), is not a rating, not a figure of merit. More windings will give lower Kv,...
Forum: Brushless Motor Construction 06-10-2014, 02:54 PM
Replies: 36
Views: 2,344
Posted By ron_van_sommeren
NdFeB dust is a health hazard: ...

NdFeB dust is a health hazard:
en.wikipedia.org/wiki/Neodymium#Precautions (https://en.wikipedia.org/wiki/Neodymium#Precautions)

NdFeB magnets get mushy when exposed to moist in the air. Seal...
Forum: Brushless Motor Construction 06-10-2014, 02:30 PM
Replies: 72
Views: 6,500
Posted By ron_van_sommeren
BK3VGX87X_Y More SLS videos ...

BK3VGX87X_Y
More SLS videos
www.sinusleistungssteller.de/projekte.html

Although RC Permanent Magnet Brushless motors (PM BLDC) can be driven by AC and VFD's, RC ESC's are not variable frequency...
Forum: Brushless Motor Construction 06-08-2014, 02:54 PM
Replies: 36
Views: 2,344
Posted By ron_van_sommeren
BTW wildflyer, you should replace all magnets....

BTW wildflyer, you should replace all magnets. Otherwise you end up with different magnet-strengths. And glue them in alternatingly.
Here's a nice method that will give you bomb-proof magnets...
Forum: Brushless Motor Construction 06-08-2014, 01:40 PM
Replies: 36
Views: 2,344
Posted By ron_van_sommeren
On Christo's diy motor building site ...

On Christo's diy motor building site
www.bavaria-direct.co.za
-> motor constants
Forum: Brushless Motor Construction 06-08-2014, 01:23 PM
Replies: 72
Views: 6,500
Posted By ron_van_sommeren
Kv, in rpm per volt, and Kt, in newton per...

Kv, in rpm per volt, and Kt, in newton per ampère, voltage respectively torque Konstant.
Kt = 1 / Kv, in units for grown-ups, i.e.SI units, not imperial units.

See also Joachim Bergmeyer's...
Forum: Brushless Motor Construction 06-07-2014, 09:59 PM
Replies: 72
Views: 6,500
Posted By ron_van_sommeren
On the other hand, it can be advantageous to keep...

On the other hand, it can be advantageous to keep some open space for cooling air to pass through, because better cooling is also good for power/weigth ratio. So there can be a trade off.

E.g....
Forum: Brushless Motor Construction 06-07-2014, 09:00 PM
Replies: 36
Views: 2,344
Posted By ron_van_sommeren
By going from delta to star you lowered Kv by a...

By going from delta to star you lowered Kv by a factor √3. Kv_delta= √3 × Kv_star. Same for torque. And since motorcurrent wants to go up with voltage squared and Kv cubed ...
Showing results 1 to 30 of 500

 
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