D9W Data (RockSim)
Accuracy of this data file:
| |
This File |
Certified |
± |
| Diameter |
24 mm |
24 mm |
= |
| Length |
70 mm |
70 mm |
= |
| Prop. Weight |
10 g |
10 g |
= |
| Total Weight |
47 g |
47 g |
−1% |
| Avg. Thrust |
10.6 N |
10.0 N |
+6% |
| Max. Thrust |
20.0 N |
20.0 N |
= |
| Total Impulse |
18.8 Ns |
18.8 Ns |
= |
| Burn Time |
1.8 s |
1.9 s |
−6% |
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Data Graph
File Notes
| Questionable data- very different shape
| John Powell
| February 3, 2021
| |
This particular data is vastly different from the other two files for the D9W. Curve shape doesn't look like any other motor curve I've seen either. It's like it was optimized to match the cert numbers perfectly, but not the shape. It gives different results in simulations as well, compared to the other two files. I feel this particular data needs to be reviewed.
|
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Raw Data
<engine-database>
<engine-list>
<engine FDiv="10" FFix="1" FStep="-1." Isp="189.41" Itot="18.76" Type="reloadable" auto-calc-cg="1" auto-calc-mass="1" avgThrust="9.979" burn-time="1.88" cgDiv="10" cgFix="1" cgStep="-1." code="D9" delays="4,7" dia="24." exitDia="0." initWt="47.1" len="70." mDiv="10" mFix="1" mStep="-1." massFrac="21.44" mfg="Aerotech" peakThrust="20." propWt="10.1" tDiv="10" tFix="1" tStep="-1." throatDia="0.">
<comments>Aerotech D9 RASP.ENG file made from NAR published data
File produced July 4, 2000
The total impulse, peak thrust, average thrust and burn time are
the same as the averaged static test data on the NAR web site in
the certification file. The curve drawn with these data points is as
close to the certification curve as can be with such a limited
number of points (32) allowed with wRASP up to v1.6.
</comments>
<data>
<eng-data cg="35." f="0." m="10.1" t="0."/>
<eng-data cg="35." f="2.204" m="10.0864" t="0.023"/>
<eng-data cg="35." f="1.653" m="10.0303" t="0.077"/>
<eng-data cg="35." f="4.96" m="9.85228" t="0.177"/>
<eng-data cg="35." f="8.817" m="9.51109" t="0.269"/>
<eng-data cg="35." f="9.92" m="9.31438" t="0.308"/>
<eng-data cg="35." f="9.368" m="9.27804" t="0.315"/>
<eng-data cg="35." f="10.604" m="9.04686" t="0.358"/>
<eng-data cg="35." f="11.94" m="8.70096" t="0.415"/>
<eng-data cg="35." f="13.917" m="8.00492" t="0.515"/>
<eng-data cg="35." f="16.675" m="7.11555" t="0.623"/>
<eng-data cg="35." f="19.155" m="6.0739" t="0.731"/>
<eng-data cg="35." f="20." m="5.43096" t="0.792"/>
<eng-data cg="35." f="19.155" m="4.66154" t="0.865"/>
<eng-data cg="35." f="19.562" m="4.41141" t="0.889"/>
<eng-data cg="35." f="18.6" m="4.06214" t="0.923"/>
<eng-data cg="35." f="16.12" m="2.98733" t="1.038"/>
<eng-data cg="35." f="14.195" m="2.35899" t="1.115"/>
<eng-data cg="35." f="12.538" m="1.85526" t="1.185"/>
<eng-data cg="35." f="10.336" m="1.28878" t="1.277"/>
<eng-data cg="35." f="7.44" m="0.829414" t="1.373"/>
<eng-data cg="35." f="4.822" m="0.459729" t="1.485"/>
<eng-data cg="35." f="2.755" m="0.200697" t="1.612"/>
<eng-data cg="35." f="1.24" m="0.0393873" t="1.762"/>
<eng-data cg="35." f="0." m="0." t="1.88"/>
</data>
</engine>
</engine-list>
</engine-database>
You can also download the raw data points as a CSV file.
