Search: Posts Made By: ron_van_sommeren
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Yesterday, 08:16 PM
07-27-2022, 10:10 PM
Replies: 4
Views: 237
Posted By ron_van_sommeren

Power system derating It is a good practice to...

Power system derating
It is a good practice to have some headroom built in. Motor runs cooler, slightly more efficient too, and you have some leeway should things go south a bit.
About derating...
07-27-2022, 09:52 PM
Replies: 4
Views: 237
Posted By ron_van_sommeren

That 710watt is the maximum continuous power...

That 710watt is the maximum continuous power rating, you should keep power drawn below that maximum. Otherwise the motor will overheat. See my next post about derating.
You can go lower, no problem,...
07-26-2022, 01:11 PM
Replies: 32
Views: 3,869
Posted By ron_van_sommeren

Latest scam methods and how to detect/avoid them,...

Latest scam methods and how to detect/avoid them, discussed in the sticky (https://en.wikipedia.org/wiki/Internet_forum#Stickying) threads in
Classifieds-RCG...
07-20-2022, 12:45 AM
Replies: 3
Views: 219
Posted By ron_van_sommeren

That's just lovely Paul. It's a bit like flying...

That's just lovely Paul.
It's a bit like flying a helicopter, one cannot see the blades. You o.t.o.h. cannot see the fuselage :D
No need to stiffen (overpressure?) the fuselage in these...
07-05-2022, 03:15 PM
Replies: 4
Views: 238
Posted By ron_van_sommeren

Latest scam methods and how to detect/avoid them,...

Latest scam methods and how to detect/avoid them, discussed in the sticky (https://en.wikipedia.org/wiki/Internet_forum#Stickying) threads in
Classifieds-RCG...
Forum: Beginners
07-02-2022, 05:35 PM
Replies: 29
Views: 945
Posted By ron_van_sommeren

It is a good practice to have some headroom built...

It is a good practice to have some headroom built in. Motor runs cooler, slightly more efficient too, and you have some leeway should things go south a bit.
About derating motors, controllers,...
Forum: Beginners
06-30-2022, 10:07 PM
Replies: 29
Views: 945
Posted By ron_van_sommeren

Or use an outrunner disguised as an inrunner. ...

Or use an outrunner disguised as an inrunner.

AXI Cyclone series
www.modelmotors.cz/product/axi-cyclone-new (http://www.modelmotors.cz/product/axi-cyclone-new)...
Forum: Beginners
06-27-2022, 10:23 PM
Replies: 29
Views: 945
Posted By ron_van_sommeren

Two of the three motorwires consecutively take...

Two of the three motorwires consecutively take turns (very fast) for providing motorpower, the third is used for measuring rotor rpm and position.
It's the motor that tells the controller when to...
Forum: Beginners
06-27-2022, 10:07 PM
Replies: 29
Views: 945
Posted By ron_van_sommeren

Propblades moving close to a post, table top,...

Propblades moving close to a post, table top, wing leading/trailing edge?
High rpm?
Prop not balanced yet?


Let's hope your motor did not get too hot. Feeling/measuring the can/bell of an...
06-25-2022, 05:44 PM
Replies: 5
Views: 14,454
Posted By ron_van_sommeren

Don't bother MedcinMn. Topicstarter has not...

Don't bother MedcinMn.
Topicstarter has not been active since fourteen minutes after his first and only post.

These one-post wonders, if not a spam-troll-bot, are the bane of RC fora.
Forum: Beginners
06-24-2022, 05:44 PM
Replies: 29
Views: 945
Posted By ron_van_sommeren

You typed a bit too fast there, since resistive...

You typed a bit 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...
Forum: Beginners
06-23-2022, 07:14 PM
Replies: 29
Views: 945
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: 29
Views: 945
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: 29
Views: 945
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: 29
Views: 945
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: 29
Views: 945
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: 29
Views: 945
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: 279
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.
.
.
Possible causes,...
06-02-2022, 11:17 AM
Replies: 1
Views: 806
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: 975
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: 3,860
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: 1,286
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: 1,286
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: 1,286
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: 1,286
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: 1,286
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: 1,130
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: 1,881
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: 1,881
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...
Showing results 1 to 30 of 500
 


 
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