From: "Charlie England" <flyrotary@lancaironline.net>
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Subject: Re: [FlyRotary] Re: Request for Performance specs on VAF
To: Rotary motors in aircraft <flyrotary@lancaironline.net>
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Date: Sun, 22 Nov 2015 17:03:07 -0600
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Thanks, Steve. I assume that all three measurements were at full 
throttle, right? (MAP ~=ambient air pressure?)

Haven't you flown with a regular wood prop in the past? Was it faster 
than the Warp Drive, or about the same speed?

And if I'm reading correctly, you still have your 'stock' radiators 
installed & had just blocked off the airflow to the stock coolers?

Charlie

On 11/22/2015 4:17 PM, Steven W. Boese wrote:
> Charlie,
>
> The following data can be forwarded to the VAF thread as you see fit:
>
> The data are averages for stabilized cruise portions of cross country flights with a single 7x16.5x2.25" radiator core in a belly mounted scoop.  The Altrak altitude hold was engaged and the data was recorded by the Dynon EFIS and EMS at 3 second intervals.  The stock cooling air inlets were blocked with flat foam plugs with about 2 sq in openings in each to supply some air flow through the cowl.
>
> RV-6A, wheel and gear leg fairings installed.			
> Mazda 13B engine, normally aspirated.			
> RWS RD1A PSRU, 2.18:1 reduction ratio.			
> Warp Drive HP propeller, 3 blade 68" dia, 16.5 degree pitch at tip.			
> Belly mounted scoop for cooling, containing coolant radiator and oil to coolant heat exchanger, variable air outlet.			
> Auxiliary coolant radiator in cowl, thermostat controlled coolant flow, variable air inlet.			
> 			
> Stabilized cruise averages:			
> date	                     8/15/2015      8/15/2015      8/16/2015
> duration (min)               20                      40                    70
> ALT (ft)                        9530               11530             10593
> DA (ft)                       12446               14294             13078
> OAT (deg F)                     69                     59                    59
> MAP (in Hg)                  20.8                 19.2                 19.0
> RPM                               5747                5712               5591
> CAS (knots)                     116                  112                  112
> TAS (knots)                     145                  143                  141
> FF (gal/hr)                      8.75                 8.15                7.76
> wt (lb)                            1745                1715               1710
>
> Coolant T in from
> cowl rad (deg F)              177                  164                 125
>
> Coolant T in from
> scoop rad (deg F)            184                  181                 179
>
> Coolant T out (deg F)      190                  187                185
> Oil T out (deg F)               226                  222                216
> Oil T in (deg F)                  205                  202                198
>
> As possible point of interest, a more recent test flight with a V shaped radiator with two 7x16.5x2.25" cores in the scoop was made.  In the cruise condition with a 114 degree F air temperature rise through the scoop radiator, the aircraft TAS was 143 knots and the scoop outlet air velocity was measured to be 157 knots TAS.
>
> Steve Boese
> RV6A, 1986 13B NA, RD1A, EC2
>
>
> --
> Homepage:  http://www.flyrotary.com/
> Archive and UnSub:   http://mail.lancaironline.net:81/lists/flyrotary/List.html


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    <div class="moz-cite-prefix">Thanks, Steve. I assume that all three
      measurements were at full throttle, right? (MAP ~=ambient air
      pressure?)<br>
      <br>
      Haven't you flown with a regular wood prop in the past? Was it
      faster than the Warp Drive, or about the same speed?<br>
      <br>
      And if I'm reading correctly, you still have your 'stock'
      radiators installed &amp; had just blocked off the airflow to the
      stock coolers?<br>
      <br>
      Charlie<br>
      <br>
      On 11/22/2015 4:17 PM, Steven W. Boese wrote:<br>
    </div>
    <blockquote cite="mid:list-8184672@logan.com" type="cite">
      <pre wrap="">Charlie,

The following data can be forwarded to the VAF thread as you see fit:

The data are averages for stabilized cruise portions of cross country flights with a single 7x16.5x2.25" radiator core in a belly mounted scoop.  The Altrak altitude hold was engaged and the data was recorded by the Dynon EFIS and EMS at 3 second intervals.  The stock cooling air inlets were blocked with flat foam plugs with about 2 sq in openings in each to supply some air flow through the cowl.   

RV-6A, wheel and gear leg fairings installed.			
Mazda 13B engine, normally aspirated.			
RWS RD1A PSRU, 2.18:1 reduction ratio.			
Warp Drive HP propeller, 3 blade 68" dia, 16.5 degree pitch at tip.			
Belly mounted scoop for cooling, containing coolant radiator and oil to coolant heat exchanger, variable air outlet.			
Auxiliary coolant radiator in cowl, thermostat controlled coolant flow, variable air inlet.			
			
Stabilized cruise averages:			
date	                     8/15/2015      8/15/2015      8/16/2015
duration (min)               20                      40                    70
ALT (ft)                        9530               11530             10593
DA (ft)                       12446               14294             13078
OAT (deg F)                     69                     59                    59
MAP (in Hg)                  20.8                 19.2                 19.0
RPM                               5747                5712               5591
CAS (knots)                     116                  112                  112
TAS (knots)                     145                  143                  141
FF (gal/hr)                      8.75                 8.15                7.76
wt (lb)                            1745                1715               1710

Coolant T in from 
cowl rad (deg F)              177                  164                 125

Coolant T in from 
scoop rad (deg F)            184                  181                 179

Coolant T out (deg F)      190                  187                185
Oil T out (deg F)               226                  222                216
Oil T in (deg F)                  205                  202                198

As possible point of interest, a more recent test flight with a V shaped radiator with two 7x16.5x2.25" cores in the scoop was made.  In the cruise condition with a 114 degree F air temperature rise through the scoop radiator, the aircraft TAS was 143 knots and the scoop outlet air velocity was measured to be 157 knots TAS. 

Steve Boese
RV6A, 1986 13B NA, RD1A, EC2</pre>
      <br>
      <fieldset class="mimeAttachmentHeader"></fieldset>
      <br>
      <pre wrap="">--
Homepage:  <a class="moz-txt-link-freetext" href="http://www.flyrotary.com/">http://www.flyrotary.com/</a>
Archive and UnSub:   <a class="moz-txt-link-freetext" href="http://mail.lancaironline.net:81/lists/flyrotary/List.html">http://mail.lancaironline.net:81/lists/flyrotary/List.html</a>
</pre>
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