Today's Message Index:
----------------------
1. 05:57 AM - Re: FW: engine data help (George Coy)
2. 06:00 AM - Re: engine data help (N395V)
3. 06:11 AM - Re: FW: engine data help (A. Dennis Savarese)
4. 07:20 AM - Re: FW: engine data help (Adam Grosser)
5. 08:14 AM - Re: FW: engine data help (Scott Aldrich)
Message 1
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| Subject: | FW: engine data help |
--> M14PEngines-List message posted by: "George Coy" <george@gesoco.com>
The engine data in the maintenance manual is all I have. The table data you
quote is what we use for a Yak-52. (and other M14P applications). The
Maintenance manual data is in engine rpm. The fuel flow is in grams per
hp-hr and Kg per Hr.
George Coy
President
Gesoco Industries Inc.
629 Airport Rd.
Swanton, VT 05488
TEL 802-868-5633
FAX 802-868-4465
Web Site www.gesoco.com
e-mail George@gesoco.com
Franklin County Airport (KFSO)
-----Original Message-----
[mailto:owner-m14pengines-list-server@matronics.com]On Behalf Of Adam
Grosser
Sent: Wednesday, July 19, 2006 10:58 PM
--> M14PEngines-List message posted by: "Adam Grosser"
<adam@foundationcap.com>
Guys:
I need to develop a power-setting table for an M14P. The commonly available
data is summarized below.
Power MAP RPM %
takeoff 34 2900 99%
Nom I 33 2400 82%
Nom II 32 2050 70%
Cruise I 29 1860 64%
Cruise II 26 1730 59%
Unfortunately, in order to get the "percent power" function to work
correctly on my avionics, this isn't enough data for developing a
power-setting table. Does anyone happen to have a diagram showing engine
power as a function of manifold
pressure and RPM? I could only find some less useful charts in the
maintenance manual that make no mention of manifold pressure, and the RPM is
engine RPM not propeller RPM.
all help welcomed,
Adam
Message 2
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| Subject: | Re: engine data help |
--> M14PEngines-List message posted by: "N395V" <n395v@hughes.net>
M14P Power Chart
Power chart from the M14P manual. RPM is for the crankshaft not the propeller (multiply
crank RPM by .658 to get prop RPM). Note that these are the sea level,
standard day, settings.
Rating HP RPM % Fuel Consumption
Grams/HP/Hour Fuel Consumption
Gallons/Liters per hr. Blower Outlet Pressure (mmHg)
Take Off 360 2900 99% 285-315 37.7- 41.7 Gal
141.7 - 157.9 Liters 125 - 15 (surplus)
885 - 870 mmHg or 34.8 - 34.2" Hg
Nominal 1 290 2400 82% 280-310 29.8 - 33.0 Gal
112.8 - 124.9 Liters 95 -15 (surplus)
855 - 840 mmHg or 33.6 - 33.0" Hg
Nominal 2 240 2050 70% 265-300 23.4 - 26.5 Gal
88.6 - 100.3 75 -15 (surplus)
835 - 820 mmHg or 32.8 - 32.2" Hg
Cruise 1 .75 of N2 1860 64% 210-230 13.9 - 15.2 Gal
52.6 - 57.6 Liters 735 mmHg +/-15 28.9" Hg (absolute)
Cruise 2 .6 of N2 1730 59% 215-235 11.4 - 12.4 Gal
43.2 - 46.9 Liters 670 mmHg +/-15 26.4" Hg (absolute)
To convert grams per horsepower/hour, first convert grams to pounds/HP (1 gram
= .0022046 pounds).
Thus 285 grams * .0022046 = .628311 pounds * 360HP = 226.2 pounds/hour / 6 pounds
per gallon = 37.7 gallons per hour. 315 grams * .0022046 = .694449 pounds *
360HP = 250.0 pounds/hour /6 pounds per gallon = 41.7 gallons per hour.
The Blower Outlet Pressure (boost) is always confusing. What they mean by "surplus"
is that pressure OVER standard atmospheric pressure, which at sea level on
a standard day is 760 mmHg (29.92" of Hg). So add 125 mm (the max SURPLUS) to
the 760 = 885 mmHG. The minus 15 would be 870 mmHg. Therefore the manifold pressure
at max takeoff power or 2900 RPM will be between 885 and 870 mmHg or 34.8
to 34.2 " Hg as read on your manifold pressure gauge on a standard day at
sea level.
Thus the Blower (boost) increases the manifold pressure over standard atmospheric
pressure at this power setting approximately 5 inches of Hg.
At the Cruise 1 power setting is where you can expect to achieve your best speed
and fuel economy. The ".75 of Nominal 2 (240 HP)" = 180 HP at 64% RPM. Fuel
consumption at this rating is 210 to 230 grams/hp/hour or 13.88 to 15.21 GPH.
That's with a manifold pressure setting of 735 +/- 15 mmHg or 28.35 to 29.52 inches
of Hg. So, as a veteran WWII B17 Bomber pilot told me a long time ago, to
get the best cruise speed with the best fuel economy, run the engine "oversquare"
or make the engine turn the prop and not the prop turn the engine. ie: Lower
rpm (in this case 64% or 1860) and higher manifold pressure (28.35 to 29.52
"Hg). In cruise flight, try setting the power to 65% (1880 - 1900 RPM) and
29 "Hg.
M14P Basic Specifications
Designation - M-14P
Cooling System - Air
Number of cylinders - 9, radial, in one row.
Dry mass of basic engine, no accessories, no oil, no mount ring - 214 kg or 471
pounds.
Cylinder order - Counterclockwise from rear view, #1 at top
Compression Ratio - 6.3
Displacement - 620 Cubic Inches / 10161 cc
Rotation, viewed from rear - crank & prop. - Left hand.
Propeller reduction gear - Planetary gears.
Propeller reduction ratio - .658
Supercharger - Centrifugal, single stage, mechanical drive.
Supercharger gear ratio - 8.16
Carburetor - Pressure type.
Start System - Compressed air.
Magneto - M-9
Max magneto check RPM drop (crankshaft) - 85 RPM (at nominal or first cruise pwr
setting)
Compressor - AK -50A
Oil pump - Gear, with pressure and scavenger sections.
Pressure and Temperature Limits
Fuel pressure limits 2.8 to 7.1 PSI, Min. idle 2.1 PSI
Oil pressure, measured at oil pump fitting - 57 to 85 PSI, Min. idle 14 PSI
Oil temp, minimum at engine inlet - 40 C.
Oil temp, recommended at inlet - 50 to 65 C.
Oil temp, max inlet for normal operations - 75 C.
Oil temp, max inlet no more than 15 minutes - 85 C.
Oil temp, maximum at engine outlet - 125 C.
Oil temp, max diff between inlet & outlet - 50 C.
CHT, (#2 & #6 cylinder) Recommended - 140 to 190 C.
CHT, minimum for normal ops. - 120 C.
CHT, min for normal prolonged ops. - 140 C.
CHT, maximum for prolonged ops. - 220 C. (max continuous CHT)
CHT, max for 15 minutes at TO & Climb pwr. - 240 C. (permissible during takeoff
and climb)
Please Note : These numbers are for reference only. Consult your engine operation
and maintenance manual for the correct parameters for your engine.
--------
Milt
N395V
F1 Rocket
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=48793#48793
Message 3
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| Subject: | Re: FW: engine data help |
--> M14PEngines-List message posted by: "A. Dennis Savarese" <dsavarese@elmore.rr.com>
The table data that George speaks of is all we have. If you look on my web
site, www.yak-52.com on the Power Settings page you will find some
explanations as well as an additional column for the fuel consumption
conversion to gallons and liters per hour.
Dennis
----- Original Message -----
Sent: Thursday, July 20, 2006 7:56 AM
> --> M14PEngines-List message posted by: "George Coy" <george@gesoco.com>
>
> The engine data in the maintenance manual is all I have. The table data
> you
> quote is what we use for a Yak-52. (and other M14P applications). The
> Maintenance manual data is in engine rpm. The fuel flow is in grams per
> hp-hr and Kg per Hr.
>
> George Coy
> President
> Gesoco Industries Inc.
> 629 Airport Rd.
> Swanton, VT 05488
> TEL 802-868-5633
> FAX 802-868-4465
> Web Site www.gesoco.com
> e-mail George@gesoco.com
> Franklin County Airport (KFSO)
>
>
> -----Original Message-----
> [mailto:owner-m14pengines-list-server@matronics.com]On Behalf Of Adam
> Grosser
> Sent: Wednesday, July 19, 2006 10:58 PM
>
>
> --> M14PEngines-List message posted by: "Adam Grosser"
> <adam@foundationcap.com>
>
> Guys:
>
> I need to develop a power-setting table for an M14P. The commonly
> available
> data is summarized below.
>
>
> Power MAP RPM %
> takeoff 34 2900 99%
> Nom I 33 2400 82%
> Nom II 32 2050 70%
> Cruise I 29 1860 64%
> Cruise II 26 1730 59%
>
> Unfortunately, in order to get the "percent power" function to work
> correctly on my avionics, this isn't enough data for developing a
> power-setting table. Does anyone happen to have a diagram showing engine
> power as a function of manifold
> pressure and RPM? I could only find some less useful charts in the
> maintenance manual that make no mention of manifold pressure, and the RPM
> is
> engine RPM not propeller RPM.
>
> all help welcomed,
>
> Adam
>
>
>
Message 4
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| Subject: | FW: engine data help |
--> M14PEngines-List message posted by: "Adam Grosser" <adam@foundationcap.com>
thanks everyone. I think I have enough data to build an interpolated curve that
will work.
Adam
________________________________
Sent: Thu 7/20/2006 6:10 AM
--> M14PEngines-List message posted by: "A. Dennis Savarese" <dsavarese@elmore.rr.com>
The table data that George speaks of is all we have. If you look on my web
site, www.yak-52.com on the Power Settings page you will find some
explanations as well as an additional column for the fuel consumption
conversion to gallons and liters per hour.
Dennis
----- Original Message -----
Sent: Thursday, July 20, 2006 7:56 AM
> --> M14PEngines-List message posted by: "George Coy" <george@gesoco.com>
>
> The engine data in the maintenance manual is all I have. The table data
> you
> quote is what we use for a Yak-52. (and other M14P applications). The
> Maintenance manual data is in engine rpm. The fuel flow is in grams per
> hp-hr and Kg per Hr.
>
> George Coy
> President
> Gesoco Industries Inc.
> 629 Airport Rd.
> Swanton, VT 05488
> TEL 802-868-5633
> FAX 802-868-4465
> Web Site www.gesoco.com
> e-mail George@gesoco.com
> Franklin County Airport (KFSO)
>
>
> -----Original Message-----
> [mailto:owner-m14pengines-list-server@matronics.com]On Behalf Of Adam
> Grosser
> Sent: Wednesday, July 19, 2006 10:58 PM
>
>
> --> M14PEngines-List message posted by: "Adam Grosser"
> <adam@foundationcap.com>
>
> Guys:
>
> I need to develop a power-setting table for an M14P. The commonly
> available
> data is summarized below.
>
>
> Power MAP RPM %
> takeoff 34 2900 99%
> Nom I 33 2400 82%
> Nom II 32 2050 70%
> Cruise I 29 1860 64%
> Cruise II 26 1730 59%
>
> Unfortunately, in order to get the "percent power" function to work
> correctly on my avionics, this isn't enough data for developing a
> power-setting table. Does anyone happen to have a diagram showing engine
> power as a function of manifold
> pressure and RPM? I could only find some less useful charts in the
> maintenance manual that make no mention of manifold pressure, and the RPM
> is
> engine RPM not propeller RPM.
>
> all help welcomed,
>
> Adam
>
>
Message 5
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| Subject: | FW: engine data help |
--> M14PEngines-List message posted by: "Scott Aldrich" <s-aldrich@comcast.net>
No help but curious what instrument you are programming? What airplane?
Most guys I know of stick with engine RPM instead of converting to prop, but
I do know of a few using prop.
I have not seen any other charts than what you have already found.
Scott
-----Original Message-----
[mailto:owner-m14pengines-list-server@matronics.com] On Behalf Of Adam
Grosser
Sent: Wednesday, July 19, 2006 9:58 PM
--> M14PEngines-List message posted by: "Adam Grosser"
<adam@foundationcap.com>
Guys:
I need to develop a power-setting table for an M14P. The commonly available
data is summarized below.
Power MAP RPM %
takeoff 34 2900 99%
Nom I 33 2400 82%
Nom II 32 2050 70%
Cruise I 29 1860 64%
Cruise II 26 1730 59%
Unfortunately, in order to get the "percent power" function to work
correctly on my avionics, this isn't enough data for developing a
power-setting table. Does anyone happen to have a diagram showing engine
power as a function of manifold
pressure and RPM? I could only find some less useful charts in the
maintenance manual that make no mention of manifold pressure, and the RPM is
engine RPM not propeller RPM.
all help welcomed,
Adam
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