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mr.sun
Joined: 30 Jan 2007
Posts: 85
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 Posted: Fri Apr 22, 2011 1:35 pm Post subject: Cruise Performance |
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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 not archive
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khorton01(at)rogers.com
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| Posted: Fri Apr 22, 2011 2:55 pm Post subject: Cruise Performance |
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On 2011-04-22, at 17:30 , mr.gsun(at)gmail.com wrote:
| Quote: | 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?
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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.
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Kevin Horton
Ottawa, Canada
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mr.sun
Joined: 30 Jan 2007
Posts: 85
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| Posted: Fri Apr 22, 2011 5:04 pm Post subject: Cruise Performance |
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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(at)rogers.com (khorton01(at)rogers.com)> wrote:> --> RV-List message posted by: Kevin Horton <khorton01(at)rogers.com (khorton01(at)rogers.com)>
>
| Quote: | On 2011-04-22, at 17:30 , mr.gsun(at)gmail.com (mr.gsun(at)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.
>>
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| Quote: | > 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.
>
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| Quote: | --
Kevin Horton
Ottawa, Canada
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martinaerodrome(at)gmail.
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| Posted: Fri Apr 22, 2011 5:45 pm Post subject: Cruise Performance |
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They sound good. Dick Martin RV8-233m (the fast one)
On Fri, Apr 22, 2011 at 4:30 PM, <mr.gsun(at)gmail.com (mr.gsun(at)gmail.com)> wrote:
[quote]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 not archive
| Quote: |
t="_blank">http://www.matronics.com/Navigator?RV-List
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lessdragprod(at)aol.com
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| Posted: Fri Apr 22, 2011 8:09 pm Post subject: Cruise Performance |
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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
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gene.lee(at)gte.net
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| Posted: Sat Apr 23, 2011 10:04 am Post subject: Cruise Performance |
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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(at)matronics.com [mailto:owner-rv-list-server(at)matronics.com] On Behalf Of Jim Ayers
Sent: Friday, April 22, 2011 11:06 PM
To: rv-list(at)matronics.com
Subject: Re: 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
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carl.froehlich(at)verizon
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| Posted: Sat Apr 23, 2011 11:04 am Post subject: Cruise Performance |
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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(at)matronics.com [mailto:owner-rv-list-server(at)matronics.com] On Behalf Of Gene Lee
Sent: Saturday, April 23, 2011 2:00 PM
To: rv-list(at)matronics.com
Subject: RE: 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(at)matronics.com [mailto:owner-rv-list-server(at)matronics.com] On Behalf Of Jim Ayers
Sent: Friday, April 22, 2011 11:06 PM
To: rv-list(at)matronics.com
Subject: Re: 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
--
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