---------------------------------------------------------- RV6-List Digest Archive --- Total Messages Posted Tue 04/14/15: 1 ---------------------------------------------------------- Today's Message Index: ---------------------- 1. 07:56 AM - Re: Performance of RV-6 With Lycoming O-320-D3G and Sensenich 70CM6 (Jay Pearlman) ________________________________ Message 1 _____________________________________ Time: 07:56:51 AM PST US From: Jay Pearlman Subject: Re: RV6-List: Performance of RV-6 With Lycoming O-320-D3G and Sensenich 70CM6 You also want to be careful that if you have an electronic ignition, there is an RPM limit during cruise with certain propellers. I believe there is a service bulletin from lycoming which has an excellent discussion of this. I do not have the number by Google works wonders. From: Charlie England To: rv6-list@matronics.com Sent: Monday, April 13, 2015 3:33 PM Subject: Re: RV6-List: Performance of RV-6 With Lycoming O-320-D3G and Sen senich 70CM6 On April 13, 2015 4:47:03 PM CDT, Charlie England wr ote: On 4/13/2015 2:41 PM, George Nielsen wrote: Does anyone have information about the following aspects for an=C2- RV-6 With Lycoming O-320-D3G engine and Sensenich 70CM6 propeller: - cruising speed performances at 55% 65% 75% Cruise Performance at 8,000 =99: | KTAS | RPM | MAP | Fuel Flow | % Power | | =C2- | =C2- | =C2- | =C2- | 75% | | =C2- | =C2- | =C2- | =C2- | 65% | | =C2- | =C2- | =C2- | =C2- | 55% | - take off and landing performance at different load , temperature and su rface (grass or concrete) at sea level , at 30=C2=B0C or 90=C2=B0F on a gra ss strip , what is =C2-for you the size of runway required ? The above are examples. Thanks to all of you who have answered all the questions which I have come up with and thanking in advance for any replies George Nielsen RV-6 PH-XGN The Hague, the Netherlands Van's takeoff, climb, and cruise numbers for a given HP engine and gross w eight are pretty accurate. The charts in Lycoming performance manuals are usually accurate, also, for HP/fuel burn at various settings. 75% power in a Lyc will burn almost exac tly .45 pounds per HP per hour. Fuel injection and electronic ignition will improve that slightly, but don't believe the miracle numbers some publish. For example, some will talk about their normally aspirated Lyc making xx HP at 75% power at 12,000 feet altitude. Cannot happen without suspending t he laws of physics. Or, 75% power 8,000 feet altitude and 2400 rpm. Again, can't happen. What matters is what your particular plane will do. Load to gross weight, and practice max performance takeoffs & climbs. If they come close to Van's numbers, then you can explore cruise numbers. 7500-8000 feet, full throttl e and 2700 rpm at Lyc's spec'd temps will give you accurate 75% power cruis e numbers. If they don't match Van's numbers pretty closely, then you may h ave cooling drag, trim drag, etc issues. FWIW, Charlie Forgot to add: the fixed pitch metal Senn. Props for O320s aren't allowed t o make 75% at 8000 feet, because of their 2600 rpm limit. 75% at that altit ude requires full throttle and 2700 rpm. Sent from my Android device with K-9 Mail. Please excuse my brevity. ------------------------------------------------------------------------------------- Other Matronics Email List Services ------------------------------------------------------------------------------------- Post A New Message rv6-list@matronics.com UN/SUBSCRIBE http://www.matronics.com/subscription List FAQ http://www.matronics.com/FAQ/RV6-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/rv6-list Browse Digests http://www.matronics.com/digest/rv6-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.