M1491-BM Data (RockSim)
Accuracy of this data file:
| |
This File |
Certified |
± |
| Diameter |
75 mm |
76 mm |
−1% |
| Length |
1,340 mm |
1,372 mm |
−2% |
| Prop. Weight |
3,850 g |
664 g |
+480% |
| Total Weight |
4,876 g |
4,876 g |
= |
| Avg. Thrust |
1,707.9 N |
1,693.0 N |
+1% |
| Max. Thrust |
2,725.0 N |
5,705.6 N |
−52% |
| Total Impulse |
5,600.7 Ns |
5,675.6 Ns |
−1% |
| Burn Time |
3.3 s |
3.4 s |
−2% |
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Raw Data
<engine-database>
<engine-list>
<engine FDiv="10" FFix="1" FStep="-1." Isp="148.69" Itot="5613.91" Type="hybrid" auto-calc-cg="1" auto-calc-mass="1" avgThrust="1675.79" burn-time="3.35" cgDiv="10" cgFix="1" cgStep="-1." code="M1491" delays="1000" dia="75." exitDia="0." initWt="4876." len="1339.85" mDiv="10" mFix="1" mStep="-1." massFrac="78.96" mfg="Contrail" peakThrust="2725." propWt="3850." tDiv="10" tFix="1" tStep="-1." throatDia="0.">
<comments>Corrected 2026-09-23 from ThrustCurve.org simfile 5f4294d20002e90000000336 (user, RockSim).
Separated repeated timestamp(s): t=0 s (2 points moved to 0, 0.01 s). Each jump now takes at most 0.01 s instead of zero time; no thrust value changed.
Contrail Rockets LLC. Hybrid Rocket Motor (M1491
75mm-3200cc Motor Using Medium Injector Kit and Nozzle
Data Input By Tom R. Sanders of Contrail Rockets
</comments>
<data>
<eng-data cg="669.925" f="0." m="3850." t="0."/>
<eng-data cg="669.925" f="2725." m="3850." t="0.01"/>
<eng-data cg="669.925" f="2635.66" m="2964.88" t="0.481523"/>
<eng-data cg="669.925" f="2286.82" m="2407.29" t="0.81187"/>
<eng-data cg="669.925" f="1860.47" m="1666.77" t="1.33259"/>
<eng-data cg="669.925" f="900." m="88.4663" t="3."/>
<eng-data cg="669.925" f="503.876" m="44.7997" t="3.09071"/>
<eng-data cg="669.925" f="0." m="0." t="3.35"/>
</data>
</engine>
</engine-list>
</engine-database>
You can also download the raw data points as a CSV file.
