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Date: Mon, 7 Oct 2013 12:26:07 -0500
Message-ID: <CAHh3jbMnDQqmLSvBwZwnuR2Fth6h=S70+ws088_XX4YJLnDh5A@mail.gmail.com>
Subject: Re: [FlyRotary] Prop and PSRU efficiency
From: Mark Steitle <msteitle@gmail.com>
To: Rotary motors in aircraft <flyrotary@lancaironline.net>
Content-Type: multipart/alternative; boundary=f46d041038a791af7a04e829f23c

--f46d041038a791af7a04e829f23c
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Bill,

While you're at it don't forget to account for the water pump and
alternator(s).

Mark S.


On Mon, Oct 7, 2013 at 12:18 PM, Bill Bradburry <bbradburry@bellsouth.net>wrote:

> I have asked this question a couple of times and no one has hazarded a
> guess.
>
> How much HP is lost from our engines due to the PSRU?  I have been
> interested in determining what the HP output of my engine is and that info
> would be needed for that estimation.
>
> They tell me that most props are about 80-85% efficient, so to calculate
> the
> hp, you take the difference between your climb rate and your glide descent
> rate at the same airspeed, multiplied by the weight, and then divided by
> 33000.
>
> Wt * V / 33000 = HP
>
> This would be the prop HP, so to get the prop flange HP, you would divide
> by
> the prop efficiency, between .8 and .85.
>
> To get the engine flywheel HP, you would have to add something for the loss
> of the PSRU.
>
> Is anyone willing to take a shot at that number??  Third or forth chance!
> :>)
>
> Bill B
>
>
>
>
> --
> Homepage:  http://www.flyrotary.com/
> Archive and UnSub:
> http://mail.lancaironline.net:81/lists/flyrotary/List.html
>

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<div dir=3D"ltr"><div>Bill, </div><div>=A0</div><div>While you&#39;re at it=
 don&#39;t forget to account for the water pump and alternator(s). </div><d=
iv>=A0</div><div>Mark S.</div></div><div class=3D"gmail_extra"><br><br><div=
 class=3D"gmail_quote">
On Mon, Oct 7, 2013 at 12:18 PM, Bill Bradburry <span dir=3D"ltr">&lt;<a hr=
ef=3D"mailto:bbradburry@bellsouth.net" target=3D"_blank">bbradburry@bellsou=
th.net</a>&gt;</span> wrote:<br><blockquote class=3D"gmail_quote" style=3D"=
margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
I have asked this question a couple of times and no one has hazarded a<br>
guess.<br>
<br>
How much HP is lost from our engines due to the PSRU? =A0I have been<br>
interested in determining what the HP output of my engine is and that info<=
br>
would be needed for that estimation.<br>
<br>
They tell me that most props are about 80-85% efficient, so to calculate th=
e<br>
hp, you take the difference between your climb rate and your glide descent<=
br>
rate at the same airspeed, multiplied by the weight, and then divided by<br=
>
33000.<br>
<br>
Wt * V / 33000 =3D HP<br>
<br>
This would be the prop HP, so to get the prop flange HP, you would divide b=
y<br>
the prop efficiency, between .8 and .85.<br>
<br>
To get the engine flywheel HP, you would have to add something for the loss=
<br>
of the PSRU.<br>
<br>
Is anyone willing to take a shot at that number?? =A0Third or forth chance!=
<br>
:&gt;)<br>
<br>
Bill B<br>
<br>
<br>
<br>
<br>
--<br>
Homepage: =A0<a href=3D"http://www.flyrotary.com/" target=3D"_blank">http:/=
/www.flyrotary.com/</a><br>
Archive and UnSub: =A0 <a href=3D"http://mail.lancaironline.net:81/lists/fl=
yrotary/List.html" target=3D"_blank">http://mail.lancaironline.net:81/lists=
/flyrotary/List.html</a><br>
</blockquote></div><br></div>

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