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Alan Roberts Launch report

May 14, 2017

Well the weather cooperated. Rain showers avoided us and the winds while brisk at times were manageable. We had a great turnout with lots of new faces which I always find exciting. New faces are the lifeblood of a club and I sincerely hope that many of those new faces become old friends as we share the rocketry bug. We had 21 flyers put up 48 rockets using 51 motors (there were no engines other than those in the cars that people arrived in). We covered the spectrum from 1/2 A thru I with a total impulse burned of 4,488 NS (I use average for each motor size). We had 8 L1 certification attempts of which 7 were successful. I believe that those all came from Marty's students. Perhaps one of the "old timers" will know if that is a record number of L1 certification attempts at a SPARC launch? Mark Howe had the most flights with 7 a couple of which involved gliders that performed quite nicely even in the stiff breeze. Rob Emanuele burned the highest collective impulse (again using average motor thrust) with 971.25 NS. Rob also had the longest time aloft on his last flight of the day at around 5 hours. Rob has to give an assist to Avista and their power lines for that feat. I watched it thru the binoculars and have to say that it was quite the flash of light when his rocket hit the power lines. Personally, I finally got my Jolly Logic Chute Release to work properly. The first flight was in a LOC Precision IRIS on a G80 Blue Thunder. Perfect straight boost with deployment of a reefed main at 2,101' AGL apogee. The JL Chute Release un-reefed the main at 600' for a perfect flight and recovery. My second flight with the JL Chute Release with a Binder Design Dragonfly on a H97 Black Jack. This rocket has flown nicely on this motor in the past. Unfortunately this time it weather cocked quite a bit which really reduced the altitude (only 1,100' AGL). This had the secondary effect of making the ejection delay too long for the flight with deployment only slightly above the 500' altitude that the JL Chute Release was set for. It all ended up fine but made for a few tense seconds. In hind sight (we seem to use a lot of that in rocketry) I should have used a faster burning motor for the wind conditions to get the rocket off the rail at a higher velocity. Our next SPARC launch is scheduled for Friday, June 2nd with the Midway Elementary School Kids followed by a full SPARC launch on Saturday, June 3rd. Don't forget that FITS will be over the Memorial Day weekend in Mansfield. Thank you to everyone that came out enjoyed the day of flying. Alan

Posted by bobble at May 14, 2017 10:27 AM


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