---------------------------------------------------------- RV-List Digest Archive --- Total Messages Posted Sat 04/23/11: 2 ---------------------------------------------------------- Today's Message Index: ---------------------- 1. 11:04 AM - Re: Cruise Performance (Gene Lee) 2. 12:04 PM - Re: Cruise Performance (Carl Froehlich) ________________________________ Message 1 _____________________________________ Time: 11:04:23 AM PST US From: "Gene Lee" 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 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" 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 > &g======================== TRONICS WEB FORUMS - nics.com/contribution">http://www.matronics.com/contribution ============ > > > t=_blank>http://www.matronics.com/Navigator?RV-List p://forums.matronics.com blank>http://www.matronics.com/contribution ________________________________ Message 2 _____________________________________ Time: 12:04:27 PM PST US From: "Carl Froehlich" Subject: RE: RV-List: 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 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" 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 > &g======================== TRONICS WEB FORUMS - nics.com/contribution">http://www.matronics.com/contribution ============ > > > t=_blank>http://www.matronics.com/Navigator?RV-List p://forums.matronics.com blank>http://www.matronics.com/contribution - The RV-List Email List utilities such as List Photoshare, and much much --> http://www.matronics.=============== http://forums.matronics.com - List Contribution Web generous nbsp; --> http://www.matronics.com/c= ------------------------------------------------------------------------------------- Other Matronics Email List Services ------------------------------------------------------------------------------------- Post A New Message rv-list@matronics.com UN/SUBSCRIBE http://www.matronics.com/subscription List FAQ http://www.matronics.com/FAQ/RV-List.htm Web Forum Interface To Lists http://forums.matronics.com Matronics List Wiki http://wiki.matronics.com Full Archive Search Engine http://www.matronics.com/search 7-Day List Browse http://www.matronics.com/browse/rv-list Browse Digests http://www.matronics.com/digest/rv-list Browse Other Lists http://www.matronics.com/browse Live Online Chat! http://www.matronics.com/chat Archive Downloading http://www.matronics.com/archives Photo Share http://www.matronics.com/photoshare Other Email Lists http://www.matronics.com/emaillists Contributions http://www.matronics.com/contribution ------------------------------------------------------------------------------------- These Email List Services are sponsored solely by Matronics and through the generous Contributions of its members.