Hi,
The following data is taken from Janes (S76c):
Powerplant:
2 turbomeca Arriel 2S1 turboshafts with FADEC
- each rated at 638 kW (856 shp) for take-off,
- 731 kW (980 shp) OEI for 30 seconds,
- 592 kW (794 shp) max continuous
Standard fuel capacity:
- 1083 litres of which 1064 litres are usable,
- optional auxiliary tank capacity 405 litres
Dimensions:
- MR diameter: 13.41 m
- MR blade chord: 0.39m
- TR diameter: 2.44 m
- TR blade chord: 0.16 m
- MR tip speed (prouty) : 205.74 m/s -> rpm = 292.8
Performance:
- Vnever exceed and max level speed: 155 kt (287 km/h)
- Max range cruising speed: 140 kt (259 km/h)
- rate of climb at S/L: 495 m (1625 ft)/ min
- service ceiling: 3871 m
- service ceiling, OEI: 975 m
- hovering ceiling IGE: 1722 m
- hovering ceiling OGE: 549 m
- range at 140 kt at FL40, standard fuel:
- no reserves: 439 n miles (813 km)
I hope this is of any use.
Greetings,
Wim
On 11/29/06, Maik Justus <[EMAIL PROTECTED]> wrote:
> Hi Syd,
>
> I have tried to adjust the rotor parameters to fit the real heli.
> Unfortunately I have only very few data for the s76c, therefore I have
> changed only some geometric data an changed the rpm to get the same
> tip-speed as the bo. The geometric data is from a poor scaled drawing of
> the s76c, maybe you have a better drawing and could correct the values
> for the width of the blade ("chord") and the position of the flapping
> hinge (rellenflaphinge). I found the airfoil sikorsky is using for the
> s76, but I did not found drag/lift curves for this airfoil.
> But I think, that the flight behavior with this parameter set is more
> realistic than with the parameters in cvs (not as easy to fly as the
> bo). The sound configuration need some adjustment to the changed rpm (I
> think, we need other samples).
>
> Maik
>
>
>
>
> Index: S76c.xml
> ===================================================================
> RCS file: /var/cvs/FlightGear-0.9/data/Aircraft/Sikorsky-76C/S76c.xml,v
> retrieving revision 1.2
> diff -u -p -r1.2 S76c.xml
> --- S76c.xml 28 Nov 2006 08:20:26 -0000 1.2
> +++ S76c.xml 29 Nov 2006 19:47:48 -0000
> @@ -22,12 +22,12 @@ Single Blade : 6.089 m
> </cruise>
>
>
> -<rotor name="main" x="0.0" y="0.0" z="0" nx="0.05" ny="0" nz="1." fx="1"
> fy="0" fz="0" ccw="0"
> +<rotor name="main" x="0.0" y="0.0" z="0" nx="0.10" ny="0" nz="1." fx="1"
> fy="0" fz="0" ccw="0"
> maxcollective="15.8" mincollective="0.2"
> mincyclicele="-4.7" maxcyclicele="10.5"
> mincyclicail="-4.23" maxcyclicail="5.65"
> - diameter="13.41" numblades="4" weightperblade="95" relbladecenter="0.5"
> - dynamic="1" rpm="442" rellenflaphinge="0.18" delta3="0"
> + diameter="13.41" numblades="4" weightperblade="97" relbladecenter="0.5"
> + dynamic="1" rpm="330" rellenflaphinge="0.07" delta3="1"
> delta=".25"
> pitch-a="10"
> pitch-b="15"
> @@ -42,7 +42,7 @@ Single Blade : 6.089 m
> ground-effect-constant="0.1"
> twist="-8.5"
> taper="1"
> - chord="0.27"
> + chord="0.32"
> number-of-segments="8"
> number-of-parts="8"
> rel-len-where-incidence-is-measured="0.7"
> @@ -57,7 +57,7 @@ Single Blade : 6.089 m
> stall-change-over="5.5"
> drag-factor-stall="2.0"
> cyclic-factor="0.8"
> - rotor-correction-factor="0.7"
> + rotor-correction-factor="0.85"
> >
> <control-input axis="/controls/flight/aileron-trim" control="CYCLICAIL"
> split="true"/>
> <control-input axis="/controls/flight/aileron" control="CYCLICAIL"
> @@ -76,7 +76,7 @@ Single Blade : 6.089 m
> <rotor name="tail" x="-8.12" y="0.4" z="0.424" nx="0.0" ny="1" nz="0.0"
> fx="1" fy="0" fz="0" ccw="0"
> maxcollective="20" mincollective="-10"
> diameter="2.44" numblades="4" weightperblade="2" relbladecenter="0.7"
> - dynamic="1" rpm="2219" rellenflaphinge="0.0" delta3="1" translift="0"
> delta="0.5"
> + dynamic="1" rpm="1750" rellenflaphinge="0.07" delta3="1" translift="0"
> delta="0.5"
> pitch-a="10"
> pitch-b="15"
> airfoil-lift-coefficient="6.4"
> @@ -84,7 +84,7 @@ Single Blade : 6.089 m
> airfoil-drag-coefficient1="0.10"
> notorque="0"
> taper="1"
> - chord="0.205"
> + chord="0.23"
> number-of-segments="5"
> number-of-parts="4"
> rel-len-blade-start="0.33"
>
>
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