Search: Posts Made By: ron_van_sommeren
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Forum: Power Systems
11-18-2022, 08:51 PM
Replies: 2
Views: 229
Posted By ron_van_sommeren

It's a Nobel Prize in the making :D

It's a Nobel Prize in the making :D
11-06-2022, 04:37 PM
Replies: 3
Views: 384
Posted By ron_van_sommeren

New member, female user name, first and only post...

New member, female user name, first and only post does not even mention RC ...
Forum: Aerodynamics
10-18-2022, 11:19 PM
Replies: 7
Views: 550
Posted By ron_van_sommeren

See/ask also ...

See/ask also
www.rcgroups.com/modeling-science-136 (https://www.rcgroups.com/modeling-science-136/)
Forum: Aerodynamics
10-12-2022, 07:15 PM
Replies: 6
Views: 593
Posted By ron_van_sommeren

Video of twin-turbojet Horten 9 at Inter-Ex 2002...

Video of twin-turbojet Horten 9 at Inter-Ex 2002 (weird, crazy and/or experimental models)
www.inter-ex.com/english/interex18/filmee.htm (http://www.inter-ex.com/english/interex18/filmee.htm)
→...
09-28-2022, 01:34 AM
Replies: 3
Views: 968
Posted By ron_van_sommeren

www.liporatings.com www.rcmodelreviews.com...

www.liporatings.com
www.rcmodelreviews.com (http://www.rcmodelreviews.com/)
www.youtube.com/user/RCModelReviews/videos (https://www.youtube.com/user/RCModelReviews/videos/)
...
Forum: Beginners
09-28-2022, 01:33 AM
Replies: 5
Views: 931
Posted By ron_van_sommeren

www.liporatings.com www.rcmodelreviews.com...

www.liporatings.com
www.rcmodelreviews.com (http://www.rcmodelreviews.com/)
www.youtube.com/user/RCModelReviews/videos (https://www.youtube.com/user/RCModelReviews/videos/)
...
09-27-2022, 09:17 PM
Replies: 1
Views: 934
Posted By ron_van_sommeren

The switch does not switch battery power off (the...

The switch does not switch battery power off (the switch would have to be big/heavy.)
Always remove battery after a days flying.
The ESC still draws some current with switch turned off, thus...
09-27-2022, 09:14 PM
Replies: 3
Views: 968
Posted By ron_van_sommeren

Battery dying, or too much mechanical resistance...

Battery dying, or too much mechanical resistance in the drive, resulting in higher current draw.
Current and motortorque are proportional.

Current drawn is proportional to voltage˛ :eek::eek:
So...
Forum: Beginners
09-26-2022, 09:44 PM
Replies: 5
Views: 931
Posted By ron_van_sommeren

No worries, battery discharge rating a.k.a....

No worries, battery discharge rating a.k.a. C-rating 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....
09-22-2022, 02:15 PM
Replies: 7
Views: 715
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, 11:58 AM
Replies: 2
Views: 796
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, 07:46 PM
Replies: 12
Views: 4,320
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, 06:45 PM
Replies: 11
Views: 1,346
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, 04:50 PM
Replies: 11
Views: 1,346
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, 05:24 AM
Replies: 11
Views: 1,346
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, 11:39 PM
Replies: 11
Views: 1,346
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, 11:15 PM
Replies: 12
Views: 4,320
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, 03:53 AM
Replies: 11
Views: 1,346
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, 08:22 PM
Replies: 11
Views: 1,346
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, 02:06 AM
Replies: 5,526
Views: 1,199,069
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, 04:18 PM
Replies: 6
Views: 563
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
08-16-2022, 12:36 AM
Replies: 118
Views: 2,364
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
08-16-2022, 12:35 AM
Replies: 6
Views: 563
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, 09:16 PM
07-27-2022, 11:10 PM
Replies: 4
Views: 1,344
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, 10:52 PM
Replies: 4
Views: 1,344
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, 02:11 PM
Replies: 32
Views: 4,293
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, 01:45 AM
Replies: 3
Views: 649
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, 04:15 PM
Replies: 4
Views: 558
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, 06:35 PM
Replies: 29
Views: 2,586
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,...
Showing results 1 to 30 of 500
 


 
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