Search: Posts Made By: ron_van_sommeren
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04-24-2022, 01:19 PM
Replies: 7
Views: 427
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: 427
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: 427
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: 427
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: 427
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: 336
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: 597
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: 597
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: 745
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: 1,218
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: 984
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: 190
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: 898
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: 898
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: 215
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: 1,155
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: 1,001
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: 1,155
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: 1,810
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?
Forum: Beginners
12-23-2021, 07:11 PM
Replies: 13
Views: 1,155
Posted By ron_van_sommeren

Keep in mind that the plane does not care about...

Keep in mind that the plane does not care about systemvoltage. It's a practical consideration, not an electrical consideration.
3s in combination with velocity konstant Kv...
Forum: Beginners
12-23-2021, 07:08 PM
Replies: 13
Views: 1,155
Posted By ron_van_sommeren

A Nobel Prize in the making. Conservative...

A Nobel Prize in the making.

Conservative rule of thumb for max.continuous power: 4watt per gram motormass.

Efficiency is Power_out/Power_in. However, here they are talking effectivity.
12-23-2021, 04:44 PM
Replies: 4
Views: 1,810
Posted By ron_van_sommeren

Several new 'iffy' members, judging by their name...

Several new 'iffy' members, judging by their name and name-structure, but these are dead giveaways:
hpoj6950setup
Volopaamorp
Raymondfuest
buraqautomotive
teen_girlsPeege
hydraruzxpnew4afKew...
Forum: Power Systems
12-14-2021, 04:02 PM
Replies: 6
Views: 1,112
Posted By ron_van_sommeren

I don't like making errors, I don't like...

I don't like making errors, I don't like criticism, I don't like it when I spread errors/mistake/misconceptions.
Forum: Power Systems
12-14-2021, 02:07 PM
Replies: 6
Views: 1,112
Posted By ron_van_sommeren

Keep in mind that a plane propeller cannot...

Keep in mind that a plane propeller cannot cavitate, it needs a liquid to cavitate:
wikipedia: Cavitation (https://en.wikipedia.org/wiki/Cavitation).

Like a wing the propeller stalls:
wikipedia:...
Replies: 4
Views: 1,437
Posted By ron_van_sommeren

You'll lose range. Just solder the two sections.

You'll lose range.
Just solder the two sections.
12-05-2021, 04:34 PM
Replies: 4
Views: 1,810
Posted By ron_van_sommeren

jeansboutique

jeansboutique
11-30-2021, 06:08 PM
Replies: 4
Views: 1,810
Posted By ron_van_sommeren

Pre-emptive 'member' removal?

Suggestions:
drkamagra
goldsilverratetoday

yellowscomtw
markcalculate

More suggestions:
www.wattflyer.com/forums/memberlist.php?&order=desc&sort=joindate...
11-26-2021, 10:41 PM
Replies: 10
Views: 3,193
Posted By ron_van_sommeren

This one popped up yesterday. ...

This one popped up yesterday.

https://www.youtube.com/watch?v=wk6Qr6OO5Xo
10-27-2021, 02:35 PM
Replies: 1
Views: 1,582
Posted By ron_van_sommeren

Don't bother guys. Message is a straight copy...

Don't bother guys.
Message is a straight copy from this 2018 post:
www.wattflyer.com/forums/showthread.php?p=1015377 (https://www.wattflyer.com/forums/showthread.php?p=1015377)
10-13-2021, 08:50 PM
Replies: 5,518
Views: 1,175,056
Posted By ron_van_sommeren

Welcome :) Forum suggestion: You are...

Welcome :)

Forum suggestion:
You are burying your questions in a very general unrelated introduction thread.

Better post/start/search in dedicated subfora for more and (relevant)knowledgeable...
Showing results 1 to 30 of 500
 


 
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