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To: flyrotary@lancaironline.net
Subject: Re: [FlyRotary] Re: Test prop/club needed
Date: Sat, 02 Jul 2011 00:30:18 -0400
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That would definately meet my needs.

Brian Trubee






-----Original Message-----
From: Ernest Christley <echristley@att.net>
To: Rotary motors in aircraft <flyrotary@lancaironline.net>
Sent: Fri, Jul 1, 2011 9:17 pm
Subject: [FlyRotary] Re: Test prop/club needed


On 06/30/2011 02:14 AM, Andrew Martin wrote:=20
> Ernest, I thought the calculation for a test club was X section =3D > 1/=
15th of length, means a 90mm square should be 1350mm or 54=E2=80=9D in you=
r > language. mine is 90x1350mm calculated to absorb 190hp@2450rpm. do I=
 > have this wrong, or do you have a more up to date equation? only > prob=
lem I can see with using a test club is needing supplemental air > for the=
 heat exchangers or very short runs.=20
> I used the attached spreadsheet.=20
>=20
>=20
I took the calipers to my dyno-prop today. After the glass and micro, I ha=
ve a cross section of 88mm all around. With my 3.18 gear reduction, it wil=
l only absorb 123Hp at 7000 RPM, according to the spreadsheet.=20
=20
The second page suggests having several bars. This one wasn't to hard to=
 make, so I guess making a few more will be in my future. I need to get ou=
t to 100mm before I'll have a bar that the spreadsheet says will absorb ov=
er 180Hp.=20
=20
Brian, I'll be cutting this bar down to 52" (1320mm) tomorrow or Sunday.=
 With a 2.85 reduction, 6500RPM will require 137Hp to spin the bar at 2281=
.=20
=20
--=20
Homepage: http://www.flyrotary.com/=20
Archive and UnSub: http://mail.lancaironline.net:81/lists/flyrotary/List.h=
tml=20


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<font color=3D'black' size=3D'2' face=3D'arial'>
<div>That would definately meet my needs.</div>


<div>&nbsp;</div>


<div>Brian Trubee<br>
<br>
</div>


<div style=3D"CLEAR: both"></div>
<br>
<br>


<div style=3D"FONT-FAMILY: arial,helvetica; COLOR: black; FONT-SIZE: 10pt"=
>-----Original Message-----<br>
From: Ernest Christley &lt;echristley@att.net&gt;<br>
To: Rotary motors in aircraft &lt;flyrotary@lancaironline.net&gt;<br>
Sent: Fri, Jul 1, 2011 9:17 pm<br>
Subject: [FlyRotary] Re: Test prop/club needed<br>
<br>


<div style=3D"BACKGROUND-COLOR: #fff; MARGIN: 0px; FONT-FAMILY: Tahoma, Ve=
rdana, Arial, Sans-Serif; COLOR: #000; FONT-SIZE: 12px" id=3DAOLMsgPart_0_=
017b4db0-35c2-4a51-bbca-3879e78923d0>On 06/30/2011 02:14 AM, Andrew Martin=
 wrote:&nbsp;<br>
&gt; Ernest, I thought the calculation for a test club was X section =3D=
 &gt; 1/15th of length, means a 90mm square should be 1350mm or 54=E2=80=
=9D in your &gt; language. mine is 90x1350mm calculated to absorb 190hp@24=
50rpm. do I &gt; have this wrong, or do you have a more up to date equatio=
n? only &gt; problem I can see with using a test club is needing supplemen=
tal air &gt; for the heat exchangers or very short runs.&nbsp;<br>
&gt; I used the attached spreadsheet.&nbsp;<br>
&gt;&nbsp;<br>
&gt;&nbsp;<br>
I took the calipers to my dyno-prop today. After the glass and micro, I ha=
ve a cross section of 88mm all around. With my 3.18 gear reduction, it wil=
l only absorb 123Hp at 7000 RPM, according to the spreadsheet.&nbsp;<br>
&nbsp;<br>
The second page suggests having several bars. This one wasn't to hard to=
 make, so I guess making a few more will be in my future. I need to get ou=
t to 100mm before I'll have a bar that the spreadsheet says will absorb ov=
er 180Hp.&nbsp;<br>
&nbsp;<br>
Brian, I'll be cutting this bar down to 52" (1320mm) tomorrow or Sunday.=
 With a 2.85 reduction, 6500RPM will require 137Hp to spin the bar at 2281=
.&nbsp;<br>
&nbsp;<br>
--&nbsp;<br>
Homepage: <A href=3D"http://www.flyrotary.com/" target=3D_blank>http://www=
.flyrotary.com/</A>&nbsp;<br>
Archive and UnSub: <A href=3D"http://mail.lancaironline.net:81/lists/flyro=
tary/List.html" target=3D_blank>http://mail.lancaironline.net:81/lists/fly=
rotary/List.html</A>&nbsp;<br>
</div>
<!-- end of AOLMsgPart_0_017b4db0-35c2-4a51-bbca-3879e78923d0 --></div>
</font>

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