Today's Message Index:
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1. 11:04 AM - Re: Cruise Performance (Gene Lee)
2. 12:04 PM - Re: Cruise Performance (Carl Froehlich)
Message 1
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| Subject: | Cruise Performance |
Speaking of D10A inaccuracies, has anyone seen theirs report wind component speeds
that just aren't really believable? Sometimes
I'll see my claim there's a 50-something kt wind when there's no way it could be
more than 20 or 25 kts.
Gene
From: owner-rv-list-server@matronics.com [mailto:owner-rv-list-server@matronics.com] On Behalf Of Jim Ayers
Sent: Friday, April 22, 2011 11:06 PM
Subject: Re: RV-List: Cruise Performance
You might want to do the GPS TAS calibration test.
My Dynon D-10A TAS reads about 7 knots low at 8.000' Density Altitude using something
close to economy cruise power, and about 8
knots low at full throttle.
Jim Ayers
-----Original Message-----
From: mr.gsun <mr.gsun@gmail.com>
Sent: Fri, Apr 22, 2011 6:05 pm
Subject: Re: RV-List: Cruise Performance
I ve got 180 hp. Lots of heavy paint, leather and tools most of the time. Thanks
for the input.
Greg
Do not archive
On Apr 22, 2011 4:01 PM, "Kevin Horton" <khorton01@rogers.com> wrote:
>
> On 2011-04-22, at 17:30 , mr.gsun@gmail.com wrote:
>
>> Hey Guys, I'm in the process of working out the new Dynon Skyview setup in my
7 year old, somewhat heavy and totally stock RV-7.
I'm at 1150# empty and have an Aerosport IO-360 with horizontal fuel injection
and the Hartzell c/s prop. I recently recorded the
following numbers in cruise flight: Altitude 8500' , 19F OAT, 8.0 gph, 2400 rpm,
22.3" mp, 161 kts TAS and 144 kts indicated. The
Skyview claims that I was producing 66% power according to it's internal database
of Lycoming IO-360 engines.
>>
>> Do these numbers sound right?
>
> Do you have a 180 hp IO-360, or a 200 hp IO-360?
>
> If you have the 180 hp engine, Van's performance claims at gross weight, adjusted
to 66% power, would be about 166 kt. If you have
the 200 hp engine, Van's perf, adjusted to 66%, would be about 172 kt.
>
> --
> Kevin Horton
> Ottawa, Canada
>
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Message 2
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| Subject: | Cruise Performance |
Yep.
Most accurate wind speed calculations are direct head/tail winds. I noticed
that for cross winds the calculated speeds can be high. I assume this is
the nature of a degree or two of heading error (or for that matter a couple
of knots of TAS error) getting blown by the sin/cosine at 90 degrees factor
- resulting in higher than actual wind speed.
In my 8A I note the TAS to be 3-4 knots high, but the heading to be very
close. The indicated wind speed did get more reasonable after I
repositioned the remote heading sensor to get rid of the heading error.
Carl
From: owner-rv-list-server@matronics.com
[mailto:owner-rv-list-server@matronics.com] On Behalf Of Gene Lee
Sent: Saturday, April 23, 2011 2:00 PM
Subject: RE: RV-List: Cruise Performance
Speaking of D10A inaccuracies, has anyone seen theirs report wind component
speeds that just aren't really believable? Sometimes I'll see my claim
there's a 50-something kt wind when there's no way it could be more than 20
or 25 kts.
Gene
From: owner-rv-list-server@matronics.com
[mailto:owner-rv-list-server@matronics.com] On Behalf Of Jim Ayers
Sent: Friday, April 22, 2011 11:06 PM
Subject: Re: RV-List: Cruise Performance
You might want to do the GPS TAS calibration test.
My Dynon D-10A TAS reads about 7 knots low at 8.000' Density Altitude using
something close to economy cruise power, and about 8 knots low at full
throttle.
Jim Ayers
-----Original Message-----
From: mr.gsun <mr.gsun@gmail.com>
Sent: Fri, Apr 22, 2011 6:05 pm
Subject: Re: RV-List: Cruise Performance
I ve got 180 hp. Lots of heavy paint, leather and tools most of the time.
Thanks for the input.
Greg
Do not archive
On Apr 22, 2011 4:01 PM, "Kevin Horton" <khorton01@rogers.com> wrote:
>
> On 2011-04-22, at 17:30 , mr.gsun@gmail.com wrote:
>
>> Hey Guys, I'm in the process of working out the new Dynon Skyview setup
in my 7 year old, somewhat heavy and totally stock RV-7. I'm at 1150# empty
and have an Aerosport IO-360 with horizontal fuel injection and the Hartzell
c/s prop. I recently recorded the following numbers in cruise flight:
Altitude 8500' , 19F OAT, 8.0 gph, 2400 rpm, 22.3" mp, 161 kts TAS and 144
kts indicated. The Skyview claims that I was producing 66% power according
to it's internal database of Lycoming IO-360 engines.
>>
>> Do these numbers sound right?
>
> Do you have a 180 hp IO-360, or a 200 hp IO-360?
>
> If you have the 180 hp engine, Van's performance claims at gross weight,
adjusted to 66% power, would be about 166 kt. If you have the 200 hp engine,
Van's perf, adjusted to 66%, would be about 172 kt.
>
> --
> Kevin Horton
> Ottawa, Canada
>
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