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In-Reply-To: <list-4931806@logan.com>
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Date: Tue, 5 Apr 2011 12:21:35 -0400
Message-ID: <BANLkTim9DPxLP_c=yvZ7DhFAcPt-TUe1Fg@mail.gmail.com>
Subject: Re: [FlyRotary] Tracy RV-8 Questions
From: Tracy <rwstracy@gmail.com>
To: Rotary motors in aircraft <flyrotary@lancaironline.net>
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Hi Doug,
    I have 48 hours on the RV-8 but almost all of them done on short test
flights while working out various development problems so I have never done
tests on the intended use of the airplane (long distance cruise at high
altitude).

  The most interesting thing (to me anyway) is that the fuel burn at low
altitude is virtually identical at the same speeds as the RV4 with a
Renesis.   This is partly due to the longer wing and the high pitch prop
which makes the engine rpm 1000 rpm lower than the -4 at the same speed.

I haven't done formal glide ratio tests but it is very obvious that it's
significantly better than the -4, also due to the longer wing.  I thought
the stall speed was much lower too but my previous statement about it being
down to 45 mph was due to a bad air speed sensor in the Bluemountain EFIS.
It's really closer to 50.   Top speed is airframe limited at 230 mph.
That's reached at around 25" MP.

Cooling is working OK and when I install the bellmouth inlet rings on the
inlets I think it will be in final form.   Right now I have what amounts to
5" pitot tubes sticking out of the cowl for inlets.   Not good at high angle
of attack in climb.   Climb at solo flight & 1/2 fuel is around 3750 fpm.

Seat of the pants impression:   One hell of a fun airplane to fly.

Tracy

On Mon, Apr 4, 2011 at 6:27 AM, <dlomheim@aol.com> wrote:

> Tracy if you get a chance would mind taking a minute to post the latest
> news on your RV-8 20B?  I know I am curious about your cruise numbers and
> fuel burn and also what your feelings are about it's handling and overall
> performance based on the extended wing you put on it.  Also, do you have the
> cooling system tweaked now where you like it or are there further gains to
> had / made?
>
> Take care,
>
> Doug Lomheim
> RV-9A / FWF / Electrical / Canopy
>
> Hope to resume work by mid - May.
>
>

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Hi Doug,<br>=A0=A0=A0 I have 48 hours on the RV-8 but almost all of them do=
ne on short test flights while working out various development problems so =
I have never done tests on the intended use of the airplane (long distance =
cruise at high altitude). <br>
<br>=A0 The most interesting thing (to me anyway) is that the fuel burn at =
low altitude is virtually identical at the same speeds as the RV4 with a Re=
nesis.=A0=A0 This is partly due to the longer wing and the high pitch prop =
which makes the engine rpm 1000 rpm lower than the -4 at the same speed.=A0=
 <br>
<br>I haven&#39;t done formal glide ratio tests but it is very obvious that=
 it&#39;s significantly better than the -4, also due to the longer wing.=A0=
 I thought the stall speed was much lower too but my previous statement abo=
ut it being down to 45 mph was due to a bad air speed sensor in the Bluemou=
ntain EFIS.=A0 It&#39;s really closer to 50.=A0=A0 Top speed is airframe li=
mited at 230 mph.=A0 That&#39;s reached at around 25&quot; MP.<br>
<br>Cooling is working OK and when I install the bellmouth inlet rings on t=
he inlets I think it will be in final form.=A0=A0 Right now I have what amo=
unts to 5&quot; pitot tubes sticking out of the cowl for inlets.=A0=A0 Not =
good at high angle of attack in climb.=A0=A0 Climb at solo flight &amp; 1/2=
 fuel is around 3750 fpm.<br>
<br>Seat of the pants impression:=A0=A0 One hell of a fun airplane to fly.<=
br><br>Tracy <br><br><div class=3D"gmail_quote">On Mon, Apr 4, 2011 at 6:27=
 AM,  <span dir=3D"ltr">&lt;<a href=3D"mailto:dlomheim@aol.com">dlomheim@ao=
l.com</a>&gt;</span> wrote:<br>
<blockquote class=3D"gmail_quote" style=3D"margin: 0pt 0pt 0pt 0.8ex; borde=
r-left: 1px solid rgb(204, 204, 204); padding-left: 1ex;"><font color=3D"bl=
ack" face=3D"arial" size=3D"2">
<div>Tracy if you get a chance would mind taking a minute to post the lates=
t news on your RV-8 20B?=A0 I know I am curious about your cruise numbers a=
nd fuel burn and also what your feelings are about it&#39;s handling and ov=
erall performance based on the extended wing you put on it.=A0 Also, do you=
 have the cooling system tweaked now where you like it or are there further=
 gains to had / made?</div>



<div>=A0</div>


<div>Take care,</div>


<div>=A0</div>


<div>Doug Lomheim</div>


<div>RV-9A / FWF / Electrical / Canopy</div>


<div>=A0</div>


<div>Hope to resume work by mid - May.<br>
<br>
</div>


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x; text-align: left; line-height: 130%;" id=3D"avg_ls_inline_popup">
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