Build Thread: Zoom and Poof!

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neil_w

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Awesome! That totally disappeared. I've ordered an H999 as well and can't wait to fly it.
What are you going to put it in? That's insane G-forces off the pad.

(sorry, probably shouldn't derail @rocketace 's thread)
 

mbeels

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What are you going to put it in? That's insane G-forces off the pad.

(sorry, probably shouldn't derail @rocketace 's thread)
I'm planning on flying it "1 sigma", the fiberglass Alien Interceptor from Mach 1 rocketry. It's a fair bit heavier than rocketace's POOF, but should still scoot.
 

rocketace

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I'm planning on flying it "1 sigma", the fiberglass Alien Interceptor from Mach 1 rocketry. It's a fair bit heavier than rocketace's POOF, but should still scoot.
Its a fun motor! You will still have a hard time seeing it. Just don't blink!
 

rocketace

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I little update: I was able to get the data off my Raven! Even though it showed that there was no recording, when I clicked download on bank 1 the data spit out. As expected the accelerometer maxed out. Here is a screenshot of the Boost then the whole flight.
Poof H999 Boost.JPG
Poof H999 Full.JPG


Based on my previous flights I updated Rocksim before the flight and it was close!
Rocksim predicted: 7240ft, 230Gs, 17.8s to apogee.
Flight: 7270ft, ???Gs, 18.3s to apogee

Did I hit my 200G goal.....Still don't know, but I had to have been close if not. I have not been able to find anyone with a 250G Raven, however I do have an old Parrot V2 250G with a damaged baro sensor. I am going to attempt to fit it in my nosecone just to ride along to see if the accelerometer still works in it.
 

rocketace

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Here we go again! Poof on an H999. I am going to try to fly it this weekend.

After doing some testing on an old Featherweight Parrot V2 I confirmed that the baro sensor is screwed, but the accelerometer seams to still be functioning properly, and its a 250G version! So, it will be tagging along in my nose cone as data only, no pyro since I cant trust the baro. Fitting it was a huge challenge. I relocated a lot of the mounting holes on the sled and re printed it. Then I removed the terminal block of the Parrot and hardwired it to a mag switch. The other mag switch is for the GPS. The Raven controlling the ejection charges still has a physical screw switch.

I am hopping that all the stuff on the backside of the FM antenna wont affect signal too much since the other side is open and free.

AVBay1.jpg
InkedAVBay2_LI.jpg


While remounting everything, I did run into a issue that if not found would have been a huge problem. I noticed the mag switch for my GPS acting in consistent and seamed not reliable. I started checking the connections and after removing the heat shirk I found this... Most likely due to repeated stress from connecting and disconnecting for charging. Needless to say, the other connections were also checked.

switch mag.jpg
 

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mbeels

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While remounting everything, I did run into a issue that if not found would have been a huge problem.
Good catch, that really would have been a problem, especially under 100+ Gs.
 

AeroAggie

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Nice work! Give me a couple months to catch up on my builds and maybe we can drag race 38s!
 

rocketace

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After some more time in RockSim, ejection charge testing, and a custom MMT adapter... I finally got Zoom ready for a low power flight.

There were a few tricky things to figure out.

1) Dropping the weight: This wasn't too bad, just swapping out the FG nose cone with altimeter and GPS for a plastic cone with a FlightSketch Mini. For the F flight I was still able to use the chute release, but for the E flight I had to remove it to still be at a safe lift off weight/speed.

2) Recovery mount: The original spot that the recovery harness attaches too is the motor itself (seen below). To get around this, I just tied a 1/4"-20 nut to the end that is near the motor. Everything is still removable and keeps the weight down. And this leaves the center bolt hole open for ejection gasses to pass though so I wont need electronic deployment.
BKheadK.JPG

3) Motor adapter: Just a quick model and print job, nothing too fancy, but it has a cool boat tail!

4) Ejection charge testing: You wouldn't think I would need to retest the ejection with as much testing as I did for the high power motors and having several successful flights. But I am glad I did! In lowpower configuration it does not have any sheer pins so I knew I could get away with less BP. Previously I used 0.7g and I decided on 0.5g for lowpower mode. I friction fitted the MMT adapter very snug and when tested, it popped the nosecone and MMT out.... Figure out it has to be the restriction of passing though the above bolt hole (which is empty in lowpower mode and the only way for the pressure to pass to the parachute bay).

I added a set screw to hold the MMT in place and friction fitted it Very tight. When tested it still moved the MMT about 1/8" out. And I had to use channel locks to remove it from its friction fit. My third try was using 3 4-40 set screws and a light friction fit. This worked great on the ground. Time for flight

IMG_8473.jpg


My motors of choice were the F67-9W and E30-7T. Location, Akrovill Airport Texas with Tripoli North Texas. As always, they put on an incredible launch. The weather in the morning was looking nasty, but the clouds burnt off around 11am and it was time to fly.

IMG_8580.jpg
IMG_8583.jpg


Both flights were great! And thanks to Harry Spears I have this great photo of the F67.
Another note: The little FlightSketch Mini is so fun. Its simply, light, and power packed. I cant wait to see their next products!
IMG_8607.jpg



Screenshot 2021-03-29 133949.jpg



D??
Still not sure if Zoom will see a D motor or not. If I could find an OOP D21 it would be great, if not the D22 could work if I can shed a few more grams. But its definitely a possibility. Only if they made a D with Warp9.

H?
I will do an H flight someday to fill in the gap, but its not a priority. I am thinking the H550ST or H178DM. But could be a H112J or H999.

Additional,
Also still want to do the I1299, J570, J510 (with body tube extender). Ok I need to slow down to save $$$ for other rockets.

And here is the video!
2021 03 TNT Akroville - Zoom F&E - YouTube
 
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