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05-26-2020, 06:14 PM
Replies: 4
Views: 119
Posted By ron_van_sommeren

Another CG calculator www.ecalc.ch...

Another CG calculator
www.ecalc.ch (http://www.ecalc.ch) (18languages)
→ Toolbox
→ cgCalc

Markus Müller, the eCalc_toolset (https://www.ecalc.ch) developer, drives a Boeing/Airbus to earn his...
Replies: 2
Views: 282
Posted By ron_van_sommeren

Flaperons can turn your landing into a violent...

Flaperons can turn your landing into a violent snaproll Chris, where/when/if one winghalf stalls, no time to recover.
On what make/type plane?

Welcome :)
05-02-2020, 11:28 PM
Replies: 6
Views: 442
Posted By ron_van_sommeren

Note that Kv (in rpm/volt) says absolutely...

Note that Kv (in rpm/volt) says absolutely nothing about motor max.power, max.current, max.torque, efficiency.
Kv only depends on desired rpm and battery voltage: Kv = RPM_noload / voltage.
It...
05-02-2020, 11:26 PM
Replies: 6
Views: 442
Posted By ron_van_sommeren

Will you be using righthanded and lefthanded...

Will you be using righthanded and lefthanded props, counterrotating?


Current drawn is proportional to pitch, #blades, voltage² (http://www.rcgroups.com/forums/showthread.php?t=2475738), Kv³,...
05-02-2020, 02:02 AM
Replies: 6
Views: 442
Posted By ron_van_sommeren

That's a cutie. Keep battery wires short,...

That's a cutie.

Keep battery wires short, extend motor wires.
However, if that is not possible/incovenient:
too long wires batteryside will kill ESC over time: precautions, solutions &...
Forum: Power Systems
04-18-2020, 06:39 PM
Replies: 4
Views: 428
Posted By ron_van_sommeren

But when/if you go brushess, keep battery wires...

But when/if you go brushess, keep battery wires short and extend motor wires.
If that's not possible:
too long wires batteryside will kill ESC over time: precautions, solutions & workarounds - RCG...
04-16-2020, 07:31 PM
Replies: 14
Views: 500
Posted By ron_van_sommeren

To give you some idea, current drawn is...

To give you some idea, current drawn is proportional to pitch, #blades and diameter⁴.
So even a small change in diameter will have huge effect.
Double diameter will 2⁴=16fold current drawn.
A more...
04-15-2020, 03:40 PM
Replies: 14
Views: 425
Posted By ron_van_sommeren

And do you get full throw, the throw you would...

And do you get full throw, the throw you would expect?
04-12-2020, 08:26 PM
Replies: 14
Views: 425
Posted By ron_van_sommeren

Connect a servo to the throttle channel and see...

Connect a servo to the throttle channel and see what it does when you advance throttle.
04-11-2020, 05:47 PM
Replies: 14
Views: 500
Posted By ron_van_sommeren

Note that the vitesse konstant Kv (in rpm/volt)...

Note that the vitesse konstant Kv (in rpm/volt) says absolutely nothing about motor max.power, max.current, max.torque, efficiency. It is not a rating, not a figure of merit, not an achievement, just...
04-11-2020, 05:43 PM
Replies: 14
Views: 500
Posted By ron_van_sommeren

Either they have Nobel Prize material there, or...

Either they have Nobel Prize material there, or they are lying through their teeth.
Replies: 6
Views: 821
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: 821
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: 15
Views: 941
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: 12
Views: 919
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: 753
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: 7,816
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: 7
Views: 1,201
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: 1,163
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: 1,616
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: 1,616
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: 1,616
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: 1,327
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: 1,616
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: 1,327
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: 1,422
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: 286
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: 286
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: 286
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.

...
Showing results 1 to 30 of 500
 


 
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