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Performance of RV-6 With Lycoming O-320-D3G and Sensenich 70

 
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genie(at)swissmail.org
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PostPosted: Mon Apr 13, 2015 11:41 am    Post subject: Performance of RV-6 With Lycoming O-320-D3G and Sensenich 70 Reply with 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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pa201950(at)yahoo.com
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PostPosted: Mon Apr 13, 2015 11:51 am    Post subject: Performance of RV-6 With Lycoming O-320-D3G and Sensenich 70 Reply with quote
Used to use a 1,100 ft grass strip. Elevation 600 MSL. With zero wind I never took off when it was 80 degrees F. Or higher. One person full fuel load. 0-320 with a fixed wood prop. 

Sent from my iPhone

On Apr 13, 2015, at 2:41 PM, George Nielsen <genie(at)swissmail.org (genie(at)swissmail.org)> 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

Quote:


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ceengland7(at)gmail.com
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PostPosted: Mon Apr 13, 2015 2:34 pm    Post subject: Performance of RV-6 With Lycoming O-320-D3G and Sensenich 70 Reply with quote
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
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


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.

Sent from my Android device with K-9 Mail. Please excuse my brevity. [quote][b]

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