Flight Log - 2013-01-13 - Rich DeAngelis's Bullpup Iris

This is the standard Estes Bullpup 12D kit, modified with a small payload bay between the forward fins and the nose cone, and a engine mount pulled slightly rearward to allow for a metal spring-clip for the motor.  It is internally modified with a Kevlar shock cord mount and a much longer shock cord.

Flight Date: 2013-01-13
Rocket Name: Bullpup Iris
Kit Name: Estes - Bullpup 12D {Kit} (007000) [1996-]
Flyer's Name: Rich DeAngelis
Motors: C6-3
Launch Site: Penn Manor School Lancaster PA
Actual Altitude: 473.00 Feet

The Bullpup seems to be plagued with problems with both altitude and recovery, so I wasn’t expecting much out of this flight.  I selected the C6-3 as it seems to be the best engine for this model.  Also, being a small, white rocket, I didn’t want it to go too far up in the air on this foggy afternoon.

After a good ignition, the rocket accelerated off the rail at 8.1 Gs, averaging 2 Gs for the 2.2 second burn time.  This got the rocket moving at a respectable 95 mph, followed by a 3.3 second coast time.  Although this particular motor delayed 3/10 second too long, it was still not long enough as the ejection fired at 462 feet while still coasting up, causing the Bullpup to come to a stop 2/10 seconds later at a record height of 473 feet.

The parachute deployed into the wind, but again for unknown reasons it didn’t fully open and as it fell it spun very fast and became extremely twisted up into a plastic wad, perhaps 100 or so turns on the shroud lines.  It did fall at a slow 10 mph though and was not damaged.  It landed about 250 feet downwind.  The 35.6 second flight was a duration record for this rocket, as it had a terrible history with recovery in the past.  Murphy’s law: I wanted this to be a low flight, and it went ahead and busted its own altitude record!  Out of five successful launches, I only ever had one successful parachute recovery with this ornery rocket.

StageMotor(s)
1Estes C6-3

 

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