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Alan Roberts launch report

June 9, 2015

What a great two days of Rocketry we had this past Friday and Saturday.
Friday of course was Midway Elementary School's opportunity to run the low power pads and what a job they did. The pads were ready and so were the kids with some excellent flights and even better attitudes (call it attitudes and altitude). I was quite impressed with their building skills and with their energy level. There were a few demonstration high power flights with lots of "ohhhs and awwwwws" from the kids. Saturday got off to an early start since the pads were already set up from the previous day. Given that it was going to a hot one the early start was very much welcomed. I started the day with a Binder Design Dragonfly on a H97 Black Jack. This rocket is basically a nose cone with elliptical fins. My build included some carefully calculated nose weight to get the proper CG/CF relationship. I must have done it right because I was rewarded with a perfectly straight boost with absolutely zero spin. Deployment was late but no damage. The next flight will have some changes to the delay grain to get a closer to apogee deployment. My second flight with my Excel Plus on a J350 White Lightening with dual deployment. This is a rebuild of the rocket that I got my Level 2 on. The second flight of that rocket (named "Just a Level 2") crashed when the altimeter shutoff after drogue deployment. The post mortem indicated that the fin can and av bay collided after drogue deployment shutting off the altimeter because of the "push pin" type of arming switch used. Accordingly my rebuilt rocket (aptly named "Just a Level 2 ver 2.0") has a roatary arming switch. The launch was straight and true with apogee drogue and the main at 700' as planned. Altitude was 3,300' v RockSim estimate of 3,700' so I'm either getting better at my simulations, better at my builds, or just plain lucky. My final flight was my MR-1 on a G80 Blue Thunder. I fly this one off a rod and got a fair amount of rod whip which sent the rocket on a trajectory over the trees to the SW. I had help from friendly spectators in tracking down the rocket and it was recovered intact without hanging up in the trees to conclude a "three for three" day for me. With all of that the highlight for me was watching Marty's EWU students launch their L powered rocket out of a 24 foot tower. What a show and what a flight. The blast hole created by the motor ignition alone was worth seeing. I'm keeping my fingers crossed that they have a good showing at their competition in two very short weeks. Thank you everyone for making it a great weekend. I'd list all your names but then run the risk of forgetting someone. Please know that your work is appreciated! That is all, Alan

Posted by bobble at June 9, 2015 3:13 PM

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