Primary point of failure last month was most likely the lack of an air compensating hole for the cargo bay. As you know, driving up a mountain makes your ears pop to equalize the pressure. The rocket is traveling that distance in a few seconds so the inside of the rocket needs to release the air pressure quickly. We had a hole for the top and bottom sections but not one in the cargo bay where the altimeter, which is using air pressure as one element of its computations, resides. So it was a big problem for it without and we have correct that oversight.
|Patching the Patched Rocket after the Launch Lugs pulled off.|
Click here for the link to the Flickr Album for the picture and video story.
Erika was able to join us on this trip to FAR and brought her own rocket to launch. We were all very dismayed when she had other obligations last month so it was great that she could make it. She made a successful flight while Davie packed the rocket body with the separation charges and I calibrated the altimeter. Click here for a link to a my first post of the FAR facility.
Once we completed the final assembly, we took the rocket out to the launch rail and slid it on. The top section does not have launch lugs so I was making a video of Davie demonstrating how the final assembly goes with the rocket on the rail. Sadly, the video has no sound and poor image quality so I didn't include it. The video ended abruptly anyway with the launch lugs pulling off the side of the rocket and it falling away from the rail. We brought the rocket back inside and patched it some more.
While waiting for the epoxy to set, Erika took a second launch attempt. After a minor igniter problem, requiring replacement of the delicate igniter, she had a second successful flight with drogue streamer release and parachute opening. But, it drifted off south of the range and despite all four of us looking for it we couldn't find it.
Jerry had some rocket tubes that we unloaded into his storage unit at the range. So now an hour has gone by for the epoxy to set. We opened the rocket long enough to start the altimeter and took it out to the launch rail - sans video to avoid another problem. We haven't used the system enough to know how long the battery supplying power to the altimeter will last which is part of why I wanted to start it on the rail last time. We expected it to last awhile but also we were concerned that at some point does the altimeter still beep while the battery does not have enough juice to fire the electric matches for chute deployment? So we felt some pressure and when we realized that we didn't have the igniter for the rocket motor so I *ran* back to get it. I did the count and handed the phone to Davie to video the flight. I pushed the button and there was a pop and then no joy and no video. The igniter fired but did not ignite the propellant. So with the clock ticking on the battery, we replaced it and I do have a video of that in the Flickr album. Click here for the video.
Just as we finished replacing the altimeter and were ready to try again, another group took their rocket out. Ordinarily I wouldn't give it too much concern but the altimeter was beeping away draining battery. I let them know that we were ready and they said they would just be a few minutes. They were right but it was another 10 or 15 minutes of taking turns posing with the rocket and checking picture quality. Again, we wouldn't care too much, its the way the place operates and very few people use the altimeters which is a major focus of the project for us but we felt a time pressure on it. Davie waited by the rocket to make sure it was still beeping when we could finally make a second take. I had Davie go ahead and call the count and fire off the rocket so I could get the video again. The flight was perfect and the video is okay. I loose site of the rocket but Davie doesn't and I pick it up again so be patient as you watch the video and you may need a big screen (verses a phone) to really enjoy it. Just after main chute deployment I catch a glimpse of a half moon on the horizon with our rocket descending with chutes deployed. Click here for the flight video.
|Perfect Landing configuration, too.|
The rocket soared straight up and drifted north over our heads and dropped about about a 100 yards the other side of the back fence. We scooted under the fence, and found it. I have a recovery video too. It is the last thing in the album. The altimeter was beeping away. My phone ran out of space on the SD card and cut odd the video just as I was about to check for the altimeter beep. Sorry for the abrupt end. Even with the time for rocket recovery and bringing it back to the barn the battery kept right on going. I was even able to extract the data without changing it. So it is good to know that the battery can indeed last a good half hour before launch and probably quite a while after. The rocket peaked out a just under 2600 feet so it flew about half a mile. The rocket can take two different sized motors and we are using the smaller option. The next goal is to make two back-to-back successful flights and then try the larger motor. Again you can get your own Sonic 3100 from US Rockets - click here.
I spent New Years in Henderson, NV where I will work the next 4 months. The next flight is still hoping to be in February as the Mojave Desert is between here and Lake Arrowhead, CA where I had been staying. For New Years Eve, I stayed up until midnight and watched the uber fireworks on the Vegas Strip via the local broadcast on the TV. Next year I am hoping to get down closer to see it live. My folks and I did spend an hour at Joker's Wild Casino and I hit two 5-of-a-kind (one paying 4 times bonus) and two 4-of-a-kind (no wilds) one of which was 4 queens with a face kicker on Aces and Faces paying 160 times my bet. Betting with nickles and quarters at a time, I peaked out at maybe $15 or less but primarily these are all hard to hit hands so it was a great way to end the year with the video poker machine going bing-bing-bing-bing-bing-bing-bing....
Update: Next blog post, Flights 3 and 4 is ready. Click here.
Update: Next blog post, Flights 3 and 4 is ready. Click here.