jay.pearlman(at)yahoo.com
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 Posted: Tue Apr 14, 2015 6:56 am Post subject: Performance of RV-6 With Lycoming O-320-D3G and Sensenich 7 |
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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 <ceengland7(at)gmail.com>
To: rv6-list(at)matronics.com
Sent: Monday, April 13, 2015 3:33 PM
Subject: Re: Performance of RV-6 With Lycoming O-320-D3G and Sensenich 70CM6
On April 13, 2015 4:47:03 PM CDT, Charlie England <ceengland7(at)gmail.com> wrote: | Quote: | On 4/13/2015 2:41 PM, George Nielsen wrote:
| Quote: | Does anyone have information about the following aspects for an RV-6 With Lycoming O-320-D3G engine and Sensenich 70CM6 propeller:
- cruising speed performances at 55% 65% 75%
Cruise Performance at 8,000’:
KTAS
RPM
MAP
Fuel Flow
% Power
75%
65%
55%
- take off and landing performance at different load , temperature and surface (grass or concrete) at sea level , at 30°C or 90°F on a grass strip , what is 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
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Van's takeoff, climb, and cruise numbers for a given HP engine and gross weight 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 exactly .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 the 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 throttle and 2700 rpm at Lyc's spec'd temps will give you accurate 75% power cruise numbers. If they don't match Van's numbers pretty closely, then you may have cooling drag, trim drag, etc issues.
FWIW,
Charlie
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Forgot to add: the fixed pitch metal Senn. Props for O320s aren't allowed to make 75% at 8000 feet, because of their 2600 rpm limit. 75% at that altitude requires full throttle and 2700 rpm.
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