Flight Log - 2012-11-23 - Rich DeAngelis's Beta

The Beta: I love this little gem, but I haven't been able to get T sized booster motors any more.

UPDATE: Estes is now making them again - I have some due to arrive shortly! Yea!!!!!

I think the small size of this rocket combined with its high-altitude capabilities is better off with a bright Mylar streamer instead of the 10" parachute.  This makes it easier to spot in the air and on the ground, and reduces drifting in the wind. This rocket was recently given my "Iris" modification, which extends the body tube about 5 inches above the streamer/parachute bay, and allows for a payload with an Altimeter One to measure altitudes.  The A-power booster and A-power sustainer really lift this Beta high, over 700 feet on just two A's!  I'd say that's pretty good proof that multi-stage rockets are more efficient with propellant, as the same mass of propellant made into a single B-motor would have topped-out at about 500 feet.

After a flight where the second stage did not light for unknown reasons, the Beta was badly damaged. It was repaired with a new and shorter payload section, and the body tube was lengthened to fix the worn-down top of the tube.  This rocket is now 19-7/8" long with both stages.

What's great about this kit is you can fly a two stage very economically, since T motors are cheaper than standard sizes.  (Iris is named after the Greek god of the rainbow. She is a messenger of the gods, linking the gods with humanity.) This rocket has flown higher than the Revel Casino Towers in Atlantic City, and the Met-Life Tower in NY, and could very easily fly over the St. Louis Gateway Arch.

 

Flight Date: 2012-11-23
Rocket Name: Beta
Kit Name: Estes - Beta {Kit} (845) [1972-1984]
Flyer's Name: Rich DeAngelis
Motors: A10-0/A3-4
Expected Altitude: 615.00 Feet
Wind Speed: 3.00 mph
Launch Site: Penn Manor School Lancaster PA
Actual Altitude: 594.00 Feet

I sent the Beta up on another flight to get three data points for the A10/A3 motor combination.  The rocket lit and again recorded a burn time of 1.1 seconds.  It appeared visibly slower on the first stage, as though it was struggling a bit from the weight. Still, it recorded a peak acceleration of 18.5 Gs which was the highest recorded, and averaged 5.2 Gs for the entire burn time.  I do know from previous flights the booster only averages about 2 Gs, so the high average is a result of the 2nd stage.

This time the speed at burnout was 122 mph, ten less than previously. At 571 feet the ejection fired, and 2/10 seconds later the rocket reached its apogee of 594 feet.  It was apparently going more vertical than the previous flight though, as it climbed an additional 23 feet in the 2/10 seconds. The ejection delay was quite long at 5.4 seconds.

Sometime shortly after ejection and too high to be seen, the swivel-clip holding the streamer to the Kevlar loop failed and opened up, so the rocket fell unseen with only the shock cord drag to slow it down.  At 600 feet up, all of us observers only saw the bright red Mylar streamer descending much slower than expected.  The streamer drifted into the next field never to be seen again.

After a long and laborious 20 minute search, the rocket was located about 250 feet upwind in the grass sans streamer.  The only damage appeared to be a heavy dent in the leading edge of the fin, about the width of the body tube. It appears that the recoil of the extra-long shock cord slammed the payload tube against the fin, since there was nothing in the grass to cause this type of damage. So now this rocket is back in the repair shop for the fourth time, and will emerge some day with yet another scar.

StageMotor(s)
1Estes A10T-0
2Estes A3T-4

 

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