Steve Shannon
Well-Known Member
All --
Studying up to fly some rockets and playing with OpenRocket on an old Glass Rocket I've got about ready to fly with the Blue Raven.
Anyhow, I am curious about what happened to the Total Impulse of the 'classic' AT G40W ?
Back in 1997 / 1998 the Motor produced about 112 N-sec Total Impulse.
The latest data at thrustcurve.org lists it at 97 N-sec.
Is the new Online Data correct ?
Thanks !
-- kjh
These are three Rho-V^2 normalized thust curves ( and the Averages ) that I've reduced from AltAcc Accelerometer Data in 1997 / 1998:
Code:$ cat ./altacc/prodata/pack/dat/g40-sum # Time g40-1 g40-2 g40-3 Average # (secs) Newton Newton Newton Thrust # ======== ======== ======== ======== ======== 0.0000 0.00 0.00 0.00 0.00 0.0625 62.67 12.04 53.58 42.76 0.1250 53.58 36.17 59.06 49.60 0.1875 62.35 66.11 50.52 59.66 0.2500 56.27 61.90 53.19 57.12 0.3125 56.13 62.79 50.28 56.40 0.3750 56.00 60.30 52.94 56.41 0.4375 58.92 62.47 50.04 57.14 0.5000 54.82 61.28 49.92 55.34 0.5625 52.66 59.20 49.81 53.89 0.6250 55.56 62.00 49.69 55.75 0.6875 54.42 55.96 49.57 53.32 0.7500 50.88 58.76 52.19 53.94 0.8125 54.15 58.62 49.33 54.03 0.8750 52.13 58.47 49.21 53.27 0.9375 52.00 55.41 49.10 52.17 1.0000 49.00 55.28 48.98 51.09 1.0625 48.89 55.15 48.86 50.97 1.1250 48.77 52.12 48.12 49.67 1.1875 48.66 52.00 48.01 49.56 1.2500 48.54 49.01 44.51 47.35 1.3125 48.43 48.97 45.78 47.73 1.3750 48.32 48.86 43.00 46.73 1.4375 45.37 44.43 42.90 44.23 1.5000 48.15 42.94 40.63 43.91 1.5625 42.35 42.85 37.34 40.85 1.6250 45.11 39.92 42.62 42.55 1.6875 42.20 39.84 39.87 40.64 1.7500 42.11 36.94 37.14 38.73 1.8125 39.22 34.04 37.07 36.78 1.8750 39.14 33.98 34.36 35.83 1.9375 33.49 31.10 34.29 32.96 2.0000 33.44 31.05 31.60 32.03 2.0625 30.60 28.19 31.54 30.11 2.1250 30.55 28.15 28.87 29.19 2.1875 27.74 25.31 26.20 26.42 2.2500 24.93 25.27 26.17 25.46 2.3125 22.14 22.44 23.52 22.70 2.3750 19.35 22.42 23.49 21.75 2.4375 16.57 19.60 20.86 19.01 2.5000 13.80 16.78 18.23 16.27 2.5625 8.29 16.77 15.61 13.56 2.6250 8.28 13.96 13.00 11.75 2.6875 5.52 13.95 10.40 9.96 2.7500 5.52 8.37 10.39 8.09 2.8125 2.76 8.37 7.79 6.31 2.8750 2.76 5.58 5.19 4.51 2.9375 2.76 2.79 2.60 2.72 3.0000 2.75 2.79 2.59 2.71 3.0625 2.75 0.00 0.00 0.92 3.1250 0.00 0.00 0.00 0.00 # ======== ======== ======== ======== ======== # I Total: 113.18 114.42 108.75 112.11 (N-Sec) # I Avg: 36.22 37.36 35.51 35.88 (N) # ISP: 151.86 162.06 154.02 155.90 (sec) # M Launch: 946.0 953.0 892.0 n/a (grams) # M Motor: 120.0 118.0 116.0 118.0 (grams) # M Propel: 76.0 72.0 72.0 73.3 (grams)
I looked at the data on ThrustCurve. The G40w was retested in 2006 and those more recent numbers are correct. Here’s the data sheet for the re-certification from the NAR:
https://www.thrustcurve.org/motors/cert/61ec3d6aa1cd0a000491cf10/G40.pdf