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1. 07:56 AM - Re: Performance of RV-6 With Lycoming O-320-D3G and Sensenich 70CM6 (Jay Pearlman)
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| Subject: | Re: 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 <ceengland7@gmail.com>
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 <ceengland7@gmail.com> 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.
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