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References: <F0A1DEBC9CB04F5DB8033F7F388AF7FA@itpartnership.com>
In-Reply-To: <F0A1DEBC9CB04F5DB8033F7F388AF7FA@itpartnership.com>
From: "sales@hyperflight.co.uk" <sales@hyperflight.co.uk>
Date: Mon, 11 May 2026 13:08:16 +0100
Message-ID: <CAEDyXA7A-hsa0uy5jh5wJiPJEqa6QcV1rs2D1i4cN2v0pFabvw@mail.gmail.com>
Subject: Re: HyperFlight Enquiry - 22247
To: freyaofclyde@yahoo.co.uk
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Hi Alan, you said

You said you have a twin motor installation and then you said =E2=80=9Can
AXI2212/20B2=E2=80=9D. So I=E2=80=99m not quite sure what you=E2=80=99ve ha=
ve. Please call me on
(07821) 35131 as I prefer answering queries by phone.

For your info, I asked ChatGPT this:

Can you connect 2 same specification Hobby grade brushless motors parallel
to a brushless speed controller?
And received this reply:

Usually *no* =E2=80=94 do *not* connect two hobby brushless motors in paral=
lel to
one ordinary brushless ESC.

A hobby brushless ESC is not just supplying =E2=80=9Cpower=E2=80=9D; it is =
actively
commutating the three motor phases by reading the motor=E2=80=99s back-EMF.=
 With
two motors connected to the same three ESC outputs, the ESC sees a mixed
signal from both motors. Even if the motors are identical, they will not
start in exactly the same rotor position or under exactly the same load, so
one motor can desynchronise, stutter, overheat, or pull very high current.

For normal RC use, the correct setup is:

*One brushless ESC per brushless motor.*

You can still control both motors from the same receiver throttle channel
using a *Y-lead* on the signal side:

Battery
  =E2=94=9C=E2=94=80=E2=94=80 ESC 1 =E2=94=80=E2=94=80=E2=94=80 Motor 1
  =E2=94=94=E2=94=80=E2=94=80 ESC 2 =E2=94=80=E2=94=80=E2=94=80 Motor 2

Receiver throttle channel
  =E2=94=94=E2=94=80=E2=94=80 Y-lead =E2=94=80=E2=94=80=E2=94=80 ESC 1 sign=
al
             =E2=94=94=E2=94=80=E2=94=80 ESC 2 signal

Important points:

   - Use *separate ESCs*, each rated for its own motor/prop current.
   - The battery must handle the *combined current* of both systems.
   - If both ESCs have BECs, usually disconnect the red wire from one ESC=
=E2=80=99s
   receiver plug, so only one BEC powers the receiver.
   - Calibrate both ESCs to the same throttle range.
   - Use the same ESC settings: brake, timing, startup power, PWM
   frequency, etc.
   - Match props and motor rotation as needed.

The only rare exception is if two brushless motors are *mechanically locked
together on the same shaft* and effectively behave as one motor, but even
then it is not generally recommended with ordinary sensorless hobby ESCs.

So for a twin-motor RC aircraft, boat, car, or project: *use two ESCs, not
one ESC with two motors in parallel.*

Kind regards, Neil.

This message has been dictated to my phone. Please ignore any errors.

On Mon, 11 May 2026 at 12:52, <freyaofclyde@yahoo.co.uk> wrote:

> Name: Alan
>
> Country: United Kingdom
>
> Telephone: 07754387765
>
> Email: freyaofclyde@yahoo.co.uk
>
> Enquiry: I wonder if you can help me? I have a twin motor installation
> using an AXI2212/20B2 coupled to a Hyperflite 30ABLHELI32ESC. How do I
> match the speed of the two motors?
>
>

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<div>Hi Alan, you said</div><div><br></div><div dir=3D"auto">You said you h=
ave a twin motor installation and then you said =E2=80=9C<span style=3D"fon=
t-size:inherit">an AXI2212/20B2=E2=80=9D. So I=E2=80=99m not quite sure wha=
t you=E2=80=99ve have. Please call me on (07821) 35131 as I prefer answerin=
g queries by phone.=C2=A0</span></div><div dir=3D"auto"><span style=3D"font=
-size:inherit"><br></span></div><div dir=3D"auto">For your info, I asked Ch=
atGPT this:</div><div dir=3D"auto"><span style=3D"font-size:inherit"><div s=
tyle=3D"font-size:inherit"><div style=3D"font-size:inherit">

<p dir=3D"auto">Can you connect 2 same specification Hobby grade brushless =
motors parallel to a brushless speed controller?</p></div></div></span></di=
v><div dir=3D"auto">And received this reply:</div><div dir=3D"auto"><span s=
tyle=3D"font-size:inherit"><br></span></div><div dir=3D"auto"><span style=
=3D"font-size:inherit">Usually </span><b style=3D"font-size:inherit;border-=
color:rgb(0,0,0)">no</b><span style=3D"font-size:inherit"> =E2=80=94 do </s=
pan><b style=3D"font-size:inherit;border-color:rgb(0,0,0)">not</b><span sty=
le=3D"font-size:inherit"> connect two hobby brushless motors in parallel to=
 one ordinary brushless ESC.</span><br></div><div dir=3D"auto"><div style=
=3D"font-size:inherit"><div style=3D"font-size:inherit">
<p>A hobby brushless ESC is not just supplying =E2=80=9Cpower=E2=80=9D; it =
is actively commutating the three motor phases by reading the motor=E2=80=
=99s back-EMF. With two motors connected to the same three ESC outputs, the=
 ESC sees a mixed signal from both motors. Even if the motors are identical=
, they will not start in exactly the same rotor position or under exactly t=
he same load, so one motor can desynchronise, stutter, overheat, or pull ve=
ry high current.</p>
<p>For normal RC use, the correct setup is:</p>
<p><b>One brushless ESC per brushless motor.</b></p>
<p>You can still control both motors from the same receiver throttle channe=
l using a <b>Y-lead</b> on the signal side:</p>
<pre style=3D"font-family:monospace"><code style=3D"font-family:monospace">=
Battery
  =E2=94=9C=E2=94=80=E2=94=80 ESC 1 =E2=94=80=E2=94=80=E2=94=80 Motor 1
  =E2=94=94=E2=94=80=E2=94=80 ESC 2 =E2=94=80=E2=94=80=E2=94=80 Motor 2

Receiver throttle channel
  =E2=94=94=E2=94=80=E2=94=80 Y-lead =E2=94=80=E2=94=80=E2=94=80 ESC 1 sign=
al
             =E2=94=94=E2=94=80=E2=94=80 ESC 2 signal</code></pre>
<p>Important points:</p>
<ul><li>Use <b>separate ESCs</b>, each rated for its own motor/prop current=
.</li><li>The battery must handle the <b>combined current</b> of both syste=
ms.</li><li>If both ESCs have BECs, usually disconnect the red wire from on=
e ESC=E2=80=99s receiver plug, so only one BEC powers the receiver.</li><li=
>Calibrate both ESCs to the same throttle range.</li><li>Use the same ESC s=
ettings: brake, timing, startup power, PWM frequency, etc.</li><li>Match pr=
ops and motor rotation as needed.</li></ul>
<p>The only rare exception is if two brushless motors are <b>mechanically l=
ocked together on the same shaft</b> and effectively behave as one motor, b=
ut even then it is not generally recommended with ordinary sensorless hobby=
 ESCs.</p>
<p dir=3D"auto">So for a twin-motor RC aircraft, boat, car, or project: <b>=
use two ESCs, not one ESC with two motors in parallel.</b></p></div></div><=
/div><div><br clear=3D"all"><div><div dir=3D"ltr" class=3D"gmail_signature"=
 data-smartmail=3D"gmail_signature">Kind regards, Neil. <br><br>This messag=
e has been dictated to my phone. Please ignore any errors.</div></div></div=
><div><br><div class=3D"gmail_quote gmail_quote_container"><div dir=3D"ltr"=
 class=3D"gmail_attr">On Mon, 11 May 2026 at 12:52, &lt;<a href=3D"mailto:f=
reyaofclyde@yahoo.co.uk">freyaofclyde@yahoo.co.uk</a>&gt; wrote:<br></div><=
blockquote class=3D"gmail_quote" style=3D"margin:0px 0px 0px 0.8ex;border-l=
eft:1px solid rgb(204,204,204);padding-left:1ex">Name: Alan <br><br>Country=
: United Kingdom<br><br>Telephone: 07754387765<br><br>Email: <a href=3D"mai=
lto:freyaofclyde@yahoo.co.uk" target=3D"_blank">freyaofclyde@yahoo.co.uk</a=
><br><br>Enquiry: I wonder if you can help me?  I have a twin motor install=
ation using an AXI2212/20B2 coupled to a Hyperflite 30ABLHELI32ESC.   How d=
o I match the speed of the two motors?<br><br></blockquote></div></div>

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