Search: Posts Made By: ron_van_sommeren
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Forum: Beginners
Yesterday, 05:44 PM
Replies: 17
Views: 183
Posted By ron_van_sommeren

You typed too fast there, since resistive losses...

You typed too fast there, since resistive losses are proportional to current squared (Ploss=I⋅Rcopper), power losses would go up by factor 3=9.


Yes, it would go up in smoke in a 1-2 seconds.
...
Forum: Beginners
06-23-2022, 07:14 PM
Replies: 17
Views: 183
Posted By ron_van_sommeren

Below an excellent quote about motor selection...

Below an excellent quote about motor selection and powersystem misconceptions
From
brushless motors Kv? ('https://www.rcgroups.com/forums/showthread.php?2083459-brushless-motors-kv').
Forum: Beginners
06-23-2022, 06:26 PM
Replies: 17
Views: 183
Posted By ron_van_sommeren

A much faster method Find same/similar plane...

A much faster method
Find same/similar plane (type, mass, span) and copy the successful power system. That way you can fly and rummage/read through the engineering stuff (I know those...
Forum: Beginners
06-22-2022, 09:58 PM
Replies: 17
Views: 183
Posted By ron_van_sommeren

Best to take advertised C-ratings with a grain of...

Best to take advertised C-ratings with a grain of salt, some are downright silly, if not risky. I would half them at least by factor two.

About C-ratings, stickertuning and other blatant lies....
Forum: Beginners
06-22-2022, 09:55 PM
Replies: 17
Views: 183
Posted By ron_van_sommeren

Some well-structured reading for rainy/windy...

Some well-structured reading for rainy/windy days, including e-flight_101 & 102, and some handy e-tools. Don't try to read, take it in, all at once, as long as you know/remember were to find the...
Forum: Beginners
06-21-2022, 10:18 PM
Replies: 17
Views: 183
Posted By ron_van_sommeren

It's only exponentiation :) That's where...

It's only exponentiation :)
That's where e-calculators (https://www.rcgroups.com/forums/showthread.php?606703-e-flight-calculators-%28compilation%29) come in handy.
But, as with all software,...
Forum: Beginners
06-21-2022, 07:30 PM
Replies: 17
Views: 183
Posted By ron_van_sommeren

Some info to reduce your trial and error process...

Some info to reduce your trial and error process a bit.

Current and power drawn are proportional to velocity_konstant_Kv (http://bavaria-direct.co.za/constants/#Kv) :eek::eek::eek:
That is...
Forum: Power Systems
06-12-2022, 02:01 PM
Replies: 2
Views: 171
Posted By ron_van_sommeren

Apart from battery voltage, voltage sag, power...

Apart from battery voltage, voltage sag, power and current readings you need rpm readings as well for debugging.
At full throttle, half throttle, with and without prop.


Mounting screws too...
06-02-2022, 11:17 AM
Replies: 1
Views: 310
Posted By ron_van_sommeren

RC Soaring Digest is back :-)

Well, actually it has already been online since januari 2021 :oops:

Homepage, with a.o. older issues
new.rcsoaringdigest.com (https://new.rcsoaringdigest.com/)
Old homepage, a.o. archive of...
05-25-2022, 07:28 AM
Replies: 2
Views: 423
Posted By ron_van_sommeren

Your motor took a beating, core/winding...

Your motor took a beating, core/winding temperature was/is higher than 255 degrees rotor temperature. Winding wire lacquer has deteriorated :(
That white stuff looks as if it got spilled in...
05-22-2022, 11:55 PM
Replies: 21
Views: 3,749
Posted By ron_van_sommeren

???? Was your reply intended for this 2014...

????
Was your reply intended for this 2014 thread, or even this RC flight forum?
04-24-2022, 01:19 PM
Replies: 7
Views: 834
Posted By ron_van_sommeren

You could use a milliOhm meter, but they tend to...

You could use a milliOhm meter, but they tend to be expensive. Fortunately there are other methods for determining motor winding resistance (http://bavaria-direct.co.za/constants/#Rm) (Rm):...
04-24-2022, 12:07 PM
Replies: 7
Views: 834
Posted By ron_van_sommeren

A.k.a. Lucien Miller www.innov8tivedesigns.com...

A.k.a. Lucien Miller
www.innov8tivedesigns.com (http://www.innov8tivedesigns.com)
&
www.cobramotorsusa.com (https://www.cobramotorsusa.com/)

Lucien knows what he is talking about, good tech...
04-23-2022, 04:39 PM
Replies: 7
Views: 834
Posted By ron_van_sommeren

A bit more background information. ...

A bit more background information.

IC-engines and e-motors have fundamentally different behaviour.
An ic-engine tries to keep a constant torque.
As a result, as propeller load goes up, rpm must...
04-23-2022, 04:39 PM
Replies: 7
Views: 834
Posted By ron_van_sommeren

An e-traction forum: www.endless-sphere.com ...

An e-traction forum:
www.endless-sphere.com


Wheels need high torque, and therefore high current (torque = current Kt = current / Kv, in SI units) at zero/low rpm.
Whereas propellers don't...
04-22-2022, 11:55 AM
Replies: 7
Views: 834
Posted By ron_van_sommeren

A dear, an EE :D I've never seen Km...

A dear, an EE :D

I've never seen Km specified in RC land, not even the torque konstant Kt (= 1/Kv, conversion in SI units,...
04-22-2022, 11:44 AM
Replies: 3
Views: 691
Posted By ron_van_sommeren

A brushless motor will run exactly the same in...

A brushless motor will run exactly the same in reverse.
04-03-2022, 12:40 AM
Replies: 2
Views: 1,183
Posted By ron_van_sommeren

Topicstarter's last registered activity was has...

Topicstarter's last registered activity was has first and only post here.
03-31-2022, 11:30 PM
Replies: 2
Views: 1,183
Posted By ron_van_sommeren

Does your motor (battery, controller) have...

Does your motor (battery, controller) have headroom left? I.e. can your motor handle more power and current than it has to do now with current setup?
Then you could increase pitch and/or...
03-17-2022, 04:17 PM
Replies: 5
Views: 1,277
Posted By ron_van_sommeren

Are you familiar with these two channels? ...

Are you familiar with these two channels?
www.youtube.com/c/ChristophLaimer (https://www.youtube.com/c/ChristophLaimer), printing motors, bearings and props....
02-13-2022, 05:09 PM
Replies: 8
Views: 1,905
Posted By ron_van_sommeren

Servo/ESC connector pin outs: Older types ...

Servo/ESC connector pin outs:
Older types
www.rcgroups.com/forums/attachmentNew.php?attachmentid=4803665 (http://www.rcgroups.com/forums/attachmentNew.php?attachmentid=4803665)
Newer types...
Forum: Power Systems
02-06-2022, 08:31 PM
Replies: 2
Views: 1,503
Posted By ron_van_sommeren

Was the prop suggested by the kit manufacturer,...

Was the prop suggested by the kit manufacturer, or by the motor manufacturer? Always high propload with lowest voltage, to keep current in bounds.
What is motor velocity konstant Kv...
02-06-2022, 03:52 PM
Replies: 3
Views: 202
Posted By ron_van_sommeren

New 'member', with such a first post, such a...

New 'member', with such a first post, such a title and such a question/text, hmmmm ...
Here we go, it is a straight copy of this 2013 opening post:
www.wattflyer.com/forums/showthread.php?t=70208
Forum: Power Systems
02-05-2022, 06:16 PM
Replies: 8
Views: 1,395
Posted By ron_van_sommeren

Is it truly opto-isolated...

Is it truly opto-isolated (https://en.wikipedia.org/wiki/Opto-isolator), or HobbyKrap 'opto-isolated', i.e. just BEC-less?
HobbyKrap messing concepts up again, lying about what opto-isolated truly...
Forum: Power Systems
02-04-2022, 05:11 PM
Replies: 8
Views: 1,395
Posted By ron_van_sommeren

Does you controller, make/type?, have a linear or...

Does you controller, make/type?, have a linear or a switching BEC on board?

UBEC is an old propriatery brand name, a generic informationless acronym for a standalone BEC: Universal BEC.
I prefer...
Forum: Power Systems
01-16-2022, 08:58 PM
Replies: 6
Views: 238
Posted By ron_van_sommeren

Don't forget to measure current as well.

Don't forget to measure current as well.
Forum: Beginners
12-28-2021, 09:12 PM
Replies: 13
Views: 1,694
Posted By ron_van_sommeren

Costs less than a broken prop per year :) ...

Costs less than a broken prop per year :)

List of free and paid calculators
e-flight calculators (compilation) - RCG...
Forum: Power Systems
12-28-2021, 08:05 PM
Replies: 0
Views: 1,520
Posted By ron_van_sommeren

Full version eCalc, free until Jan. 4th.

From the eCalc (http://www.ecalc.ch) FAQ, suggestions and help thread at
eCalc: Q&A for propCalc, fanCalc, heliCalc, xcopterCalc - RCGl...
Forum: Beginners
12-24-2021, 07:19 PM
Replies: 13
Views: 1,694
Posted By ron_van_sommeren

Another possible scenario. Overheating...

Another possible scenario.

Overheating magnets causes de-magnetizing (https://en.wikipedia.org/wiki/Curie_temperature) (irreversible! :(), which in turn results in higher velocity konstant Kv...
12-23-2021, 07:29 PM
Replies: 4
Views: 2,182
Posted By ron_van_sommeren

How about disabling new member registration for a...

How about disabling new member registration for a while, say for one, two weeks or so?
Showing results 1 to 30 of 500
 


 
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