Search: Posts Made By: ron_van_sommeren
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Forum: Beginners
Yesterday, 08:44 PM
Replies: 2
Views: 65
Posted By ron_van_sommeren

No, it battery discharge rate cannot be too high....

No, it battery discharge rate cannot be too high. It is a maximum rating, not the actual current, batteries (and controllers) don't force feed the motor with a certain current.
Each fuse in the fuse...
09-22-2022, 01:15 PM
Replies: 7
Views: 78
Posted By ron_van_sommeren

There's lies, big lies ... and C-ratings. I...

There's lies, big lies ... and C-ratings. I would at least half a/any specced C-rating. Your batteries will love you for it.

About C-ratings, discharge rates, stickertuning and other 'optimistic'...
09-21-2022, 10:58 AM
Replies: 2
Views: 81
Posted By ron_van_sommeren

You can post videos on RCU, but not here on WFF? ...

You can post videos on RCU, but not here on WFF?

Can you see this 'random' youtube video?

https://youtu.be/vljy3lKIN-0
09-10-2022, 06:46 PM
Replies: 12
Views: 4,217
Posted By ron_van_sommeren

You replied in a thread from 2007 Ed.

You replied in a thread from 2007 Ed.
Forum: Power Systems
09-08-2022, 05:45 PM
Replies: 11
Views: 425
Posted By ron_van_sommeren

A bit off topic, but ... Important: note that...

A bit off topic, but ...
Important: note that Kv says nothing about motor's max. power.
Both the tiny motor in your toothbrush and the motor in a 330kmh/205mph ICE...
Forum: Power Systems
09-08-2022, 03:50 PM
Replies: 11
Views: 425
Posted By ron_van_sommeren

My earlier...

My earlier (https://www.wattflyer.com/forums/showthread.php?p=1034346#post1034346) quick'n dirty estimation Kv=200rpm/volt wasn't that far off :)

However, for current and power drawn calculations...
Forum: Power Systems
09-07-2022, 04:24 AM
Replies: 11
Views: 425
Posted By ron_van_sommeren

That's buzzing out, buzzing sound means...

That's buzzing out, buzzing sound means continuity, but there's a catch.

The coils of a brushless motor can be terminated/configured in ∆/deltat/triangle/ or in Y/wye/star.
In triangle, a...
Forum: Power Systems
09-06-2022, 10:39 PM
Replies: 11
Views: 425
Posted By ron_van_sommeren

Not caused by higher resistance due to your...

Not caused by higher resistance due to your soldering.
For such a difference in RPM to occur, you'd have to lose/'burn' a lot of voltage&power just in that small soldering spot.
Extremely rough...
09-06-2022, 10:15 PM
Replies: 12
Views: 4,217
Posted By ron_van_sommeren

And Flite-Metal didn't scroll up far enough ;)

And Flite-Metal didn't scroll up far enough ;)
Forum: Power Systems
09-04-2022, 02:53 AM
Replies: 11
Views: 425
Posted By ron_van_sommeren

For resoldering with a fresh 'stretch' of wire...

For resoldering with a fresh 'stretch' of wire you have to remove the insulation coating/lacquer/resin. Tough stuff.
With most motors the motor wires are extensions of the windig wires.

Can you...
Forum: Power Systems
09-02-2022, 07:22 PM
Replies: 11
Views: 425
Posted By ron_van_sommeren

Does it always take about half a minute before...

Does it always take about half a minute before the problem occurs?
Have you tried different batteries?
Current and battery voltage (drop) measured?
.
.

Mounting screws too long, delved into...
08-23-2022, 01:06 AM
Replies: 5,526
Views: 1,186,819
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.
Will save you, and us :D a lot of questions. Notably the 'what went wrong?' kind of questions...
Forum: Power Systems
08-16-2022, 03:18 PM
Replies: 6
Views: 251
Posted By ron_van_sommeren

A user deals only with the outside, the motor is...

A user deals only with the outside, the motor is just a black box, only voltage, pitch, Kv, gearing, prop-diameter, max.current and max.power matter. That's what your problem/question is about.
...
Forum: Humor
08-15-2022, 11:36 PM
Replies: 81
Views: 1,560
Posted By ron_van_sommeren

That would be very telling in my case :D

That would be very telling in my case :D
Forum: Power Systems
08-15-2022, 11:35 PM
Replies: 6
Views: 251
Posted By ron_van_sommeren

Your question is a motor user question, motor as...

Your question is a motor user question, motor as black box, not a motor designer/builder/(re)winder question.
08-11-2022, 08:16 PM
07-27-2022, 10:10 PM
Replies: 4
Views: 686
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: 686
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: 4,003
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: 396
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: 373
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: 1,620
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: 1,620
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: 1,620
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: 1,620
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: 14,919
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: 1,620
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: 1,620
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: 1,620
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: 1,620
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....
Showing results 1 to 30 of 500
 


 
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