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Search: Posts Made By: ron_van_sommeren
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Replies: 6
Views: 205
Posted By ron_van_sommeren

... because torque and current are proportional: ...

... because torque and current are proportional:
torque = current × Kv
And conversely:
current = torque / Kv
Both calculations must be in SI units!: newtonmeter per ampère and radians...
Replies: 6
Views: 205
Posted By ron_van_sommeren

This forum deals with propellors. But a...

This forum deals with propellors.

But a wheel-load is different from a propellor-load, especially at startup: high-torque ('=' high-current) and difficult (sensorless) rotor position detection...
03-21-2020, 02:35 AM
Replies: 10
Views: 285
Posted By ron_van_sommeren

Just hover your helicopter over your head and...

Just hover your helicopter over your head and germs can't even come close.
Excellent safety measure.
Forum: Humor
03-16-2020, 02:58 PM
03-15-2020, 05:06 PM
Replies: 10
Views: 332
Posted By ron_van_sommeren

How long have the batteries not been used? Tx,...

How long have the batteries not been used? Tx, Rx, BEC?
Forum: Free Items
02-26-2020, 04:02 PM
Replies: 6
Views: 354
Posted By ron_van_sommeren

Massive trolling, don't waste your time guys.

Massive trolling, don't waste your time guys.
02-10-2020, 03:33 AM
Replies: 27
Views: 6,962
Posted By ron_van_sommeren

Small to average sized models www.rbckits.com...

Small to average sized models
www.rbckits.com (https://www.wattflyer.com/forums/www.rbckits.com) / www.rc-builder.com (https://www.rc-builder.com/)

Large models
www.rc-europe.eu...
02-09-2020, 06:19 PM
Replies: 3
Views: 515
Posted By ron_van_sommeren

The better the questions, the more info, the...

The better the questions, the more info, the better the answers can be.
E.g. you would not be the first one to mistakenly assume that prop thrust must be higher than plane mass in order for a plane...
Forum: Power Systems
02-09-2020, 06:06 PM
Replies: 2
Views: 796
Posted By ron_van_sommeren

You could search for similar Cubs and just copy a...

You could search for similar Cubs and just copy a good power system.

Do all your 6s packs have same capacity? A 12s pack of same capacity as a 6s pack has twice the energy and twice the mass, and...
01-23-2020, 05:28 PM
Replies: 15
Views: 1,038
Posted By ron_van_sommeren

Four anything above 3-4s use a (controller with...

Four anything above 3-4s use a (controller with a) switching SBEC, not a linear LBEC.

The higher the power-pack voltage, the fewer servos a non-switching = linear LBEC can handle. Switching SBEC's...
01-23-2020, 05:13 PM
Replies: 15
Views: 1,038
Posted By ron_van_sommeren

No worries then, you already have experience with...

No worries then, you already have experience with e-equipment and e-routines.

Slightly worrisome :D

No, it won't. The whole point of an Y cable is to connect the three plus pins in the three...
01-22-2020, 01:11 PM
Replies: 15
Views: 1,038
Posted By ron_van_sommeren

Don't forget to remove the red pin from one of...

Don't forget to remove the red pin from one of your ESC connectors. Otherwise you get two different voltages, linear lbec and battery, or lbec and lbec, fighting each other. Or in the case of...
Forum: Power Systems
01-22-2020, 01:05 PM
Replies: 3
Views: 901
Posted By ron_van_sommeren

Just make sure the ESCs gets (moving) cooling air...

Just make sure the ESCs gets (moving) cooling air in the fuselage.

More reading, LiPo best care practices...
01-22-2020, 12:46 PM
Replies: 15
Views: 1,038
Posted By ron_van_sommeren

I would start with a dedicated single-motor...

I would start with a dedicated single-motor beginnersplane. Otherwise you are in for a very steep, expensive, frustrating and risky learning curve.
Do you have RC flying experience? What with?
...
Forum: Power Systems
01-22-2020, 12:23 PM
Replies: 3
Views: 901
Posted By ron_van_sommeren

Best electrical solution: battery packs in the...

Best electrical solution: battery packs in the nacelles or wings. Lowest resistance in battery and motor wires, lowest inductance in battery wires.
Second best: controllers in fuselage, near...
01-22-2020, 12:17 PM
Replies: 5
Views: 876
Posted By ron_van_sommeren

Originally it cost 200+ $ close out sale...

Originally it cost 200+ $
close out sale Hyperion Emeter II, with optical and electrical tach, servo tester, local&remote logging - RCG (http://www.rcgroups.com/forums/showthread.php?t=2649140)...
01-20-2020, 11:24 AM
Replies: 4
Views: 202
Posted By ron_van_sommeren

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

Some well-structured reading for rainy/windy days, including two online books, and some handy e-tools as well.
Will save you, and us https://static.rcgroups.net/forums/images/smilies/biggrin.gif a...
01-20-2020, 11:18 AM
Replies: 4
Views: 202
Posted By ron_van_sommeren

Below an excellent quote about Kv and motor...

Below an excellent quote about Kv and motor selection.
From
brushless motors Kv? (https://www.rcgroups.com/forums/showthread.php?2083459-brushless-motors-kv)
01-20-2020, 11:16 AM
Replies: 4
Views: 202
Posted By ron_van_sommeren

Kv says very little about max.power or max....

Kv says very little about max.power or max. current a motor can handle, nor about max. torque. A 1:1 train motor and the motor in your toothbrush or in a bedroom appliance can have the same Kv.

...
01-14-2020, 10:24 AM
Replies: 10
Views: 1,589
Posted By ron_van_sommeren

Don't forget to disconnect battery from...

Don't forget to disconnect battery from controller(s) after a days flying. Even though motor is not running, controller always draws a little bit of current. This may discharge LiPo too far, ruining...
01-13-2020, 07:19 PM
Replies: 10
Views: 1,589
Posted By ron_van_sommeren

Lipo Care Best Practices ...

Lipo Care Best Practices
www.rcgroups.com/forums/showthread.php?1767093-Battery-Load-Test-Comparisons/page835&perpage=10#post43327055...
12-23-2019, 07:58 PM
Replies: 7
Views: 10,845
Posted By ron_van_sommeren

The Cliffsnotes for that document by, MCSGUY/Joe....

The Cliffsnotes for that document by, MCSGUY/Joe.
Recently John provided a thread for the translation of bzfrank's expert level Lithium Polymer Technology publication. It covers all the major issues...
Forum: Humor
12-21-2019, 12:51 AM
Replies: 0
Views: 715
Posted By ron_van_sommeren

British WWII pilots

https://www.youtube.com/watch?v=r_b1Y-Rl_Uo

https://www.youtube.com/watch?v=gklLWp7FieE
12-21-2019, 12:40 AM
Replies: 7
Views: 10,845
Posted By ron_van_sommeren

Everything you always wanted to know about LiPo...

Everything you always wanted to know about LiPo technology but were afraid to ask:
www.rcgroups.com/forums/showthread.php?3423037-Lithium-Polymer-Battery-Technology-English-version...
12-19-2019, 09:56 PM
Replies: 10
Views: 1,434
Posted By ron_van_sommeren

See also this handy table current increase with...

See also this handy table
current increase with one or two cells added, simple table - RCG...
Replies: 14
Views: 1,015
Posted By ron_van_sommeren

That way you get roll and up/down effect...

That way you get roll and up/down effect simultaneously: corkscrew (or barrelroll?).
Y-cable. But you have to make sure you install the 2nd servo the right way, because you cannot reverse output if...
12-17-2019, 11:21 PM
Replies: 10
Views: 1,434
Posted By ron_van_sommeren

A motor does not behave like a resistor R where...

A motor does not behave like a resistor R where current I is proportional to voltage U: I = U/R.

Power drawn is proportional to voltage cubed :eek::eek::eek:
Here power wants to increase by...
11-26-2019, 12:10 PM
Replies: 3
Views: 2,353
Posted By ron_van_sommeren

Established in 1930, Graupner/wikipedia...

Established in 1930, Graupner/wikipedia (https://en.wikipedia.org/wiki/Graupner_(company)). (Robbe (https://en.wikipedia.org/wiki/Robbe) was even older).
Graupner even had its own balsa tree...
11-26-2019, 03:22 AM
Replies: 3
Views: 2,353
Posted By ron_van_sommeren

Graupner press release :-(

www.graupner.com (http://www.graupner.com) press release.

South-Korean corporate parent Graupner Co., Ltd performs restructuring and relocates the manufacturing back into the head...
11-08-2019, 04:36 PM
Replies: 2
Views: 2,121
Posted By ron_van_sommeren

I've noticed it too. As a result my replies to...

I've noticed it too. As a result my replies to first time posters have become shorter, and usually have a (relevant) question in it. If they don't answer it probably wasn't much of an issue to begin...
Showing results 1 to 30 of 500
 


 
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