SONIC JART, 54 MD build!

jus_rockets · Sep 8, 2013

Since everyone has a Jart I had to have one myself. Alex was selling just the booster which he did a T2T and I decided to buy it. It will be dual deploy with the electronics in the nosecone using a cable cutter to release the main. I plan on flying it on a K550W or K805G, it should hit close to 14k at around Mach 2. I will be using a RRC3 altimeter and a micro GTU to track it.

Rocketman248 · Sep 8, 2013

That's going to be one serious flame to rocket length ratio. Be sure to get a picture!

Aksrockets · Sep 8, 2013

You forgot pitchers!

Glad that you were able to find a use for that booster! It looks like it's in good hands.

Take care of Charlie for me!

op:

Alex

jus_rockets · Sep 8, 2013

Photobucket was not working for me last night, post updated with pictures.

jus_rockets · Sep 22, 2013

Updated the Openrocket file and decided to take 5 inches off. Right now everything weights about 30 ounces and it's 37.75 inches tall. Tomorrow I will start building the Av bay in the nosecone.

Almost ready for a paint job!

View attachment SONIC JART.ork

blackbrandt · Sep 22, 2013

This is gonna be awesome.

Wayco · Sep 22, 2013

Rocketman248 said:
That's going to be one serious flame to rocket length ratio. Be sure to get a picture!

Not much chance of ever seeing a picture or the rocket if he flies it on a K motor. The rocket will be at 1000 ft. in the time it takes to press the shutter button, and you have to know which way it went to find it with a tracker.
Good luck Juan, hope I get to see this before you fly it.

mannyskid · Sep 22, 2013

Interesting....

I think Alex's build was somewhat inspired by my 54mm minimum diameter Jart that I flew back in January.

I flew mine on a CTI K740 C*. I only got the nose cone with the electronics back thanks to an oversized ejection charge. I got just under 15,500 feet and mach 2.7.

[YOUTUBE]kMTbsRwKw30[/YOUTUBE]

This should be interesting, I'll be looking forward to the results.

Manny

jus_rockets · Sep 22, 2013

blackbrandt said:
This is gonna be awesome.

Thanks! that is what I am hoping for.

Wayco said:
Not much chance of ever seeing a picture or the rocket if he flies it on a K motor. The rocket will be at 1000 ft. in the time it takes to press the shutter button, and you have to know which way it went to find it with a tracker.
Good luck Juan, hope I get to see this before you fly it.

Of course you will see it before I fly it because I am not guaranteed to get it back even with a tracker.

mannyskid said:
Interesting....

I think Alex's build was somewhat inspired by my 54mm minimum diameter Jart that I flew back in January.

I flew mine on a CTI K740 C*. I only got the nose cone with the electronics back thanks to an oversized ejection charge. I got just under 15,500 feet and mach 2.7.

This should be interesting, I'll be looking forward to the results.

Manny

My sim on a K740 was around 15700ft and mach 2.25. That sucks that you did not get it back

Do you any pictures of the Av-bay and more of the rocket?

jus_rockets · Sep 23, 2013

Today I worked on the Av-bay, its a tight fit. I tried to put the GTU in there but there was not enough room. Tomorrow I will wire the switch , drill vent holes, and play with the cable cutter setup.

patelldp · Sep 23, 2013

I am going to be doing something very similar, but the plan is to use a Raven2 with the Power Perch. This should reduce the overall footprint of the altimeter including wiring, allowing more room for the GPS. Couple that with a 7.4V battery on the GPS and I should have enough room.

What size all thread are you running down the middle of the cone? Smaller is better (within reason) in these applications. I am planning to use a piece of 10-32 on mine.

jus_rockets · Sep 25, 2013

patelldp said:
I am going to be doing something very similar, but the plan is to use a Raven2 with the Power Perch. This should reduce the overall footprint of the altimeter including wiring, allowing more room for the GPS. Couple that with a 7.4V battery on the GPS and I should have enough room.

What size all thread are you running down the middle of the cone? Smaller is better (within reason) in these applications. I am planning to use a piece of 10-32 on mine.

I used a 1/4 inch all thread but I should of gone with a #10 or #8. The gps itself fit, I just had trouble fitting the 9v batteries inside. I plan on just attaching a CSI tracker on the shock cord.

jus_rockets · Sep 26, 2013

Today I finished the av-bay and threw some paint on it. The paint is not that great but I don't think that really matters for this rocket. I also received my cable cutter on Monday and should be testing it soon. All left to do is drill holes and attach the shock cord.

blackbrandt · Sep 26, 2013

How did you cut the av-bay sled?

Namely, how did you make it the shape of the nose cone?

jd2cylman · Sep 26, 2013

blackbrandt said:
How did you cut the av-bay sled?

Namely, how did you make it the shape of the nose cone?

You take a pencil, add a nosecone, spritz with a little water, dance in a circle anticlockwise twice while reciting the alphabet in Latin, and !!Wallah!!

OK, seriously... I would trace the outline of the nosecone on a sheet of paper, then reduce that by double the thickness of the wall of the cone.
Am I close Juan?

Adrian

jus_rockets · Sep 26, 2013

blackbrandt said:
How did you cut the av-bay sled?

Namely, how did you make it the shape of the nose cone?

jd2cylman said:
You take a pencil, add a nosecone, spritz with a little water, dance in a circle anticlockwise twice while reciting the alphabet in Latin, and !!Wallah!!

OK, seriously... I would trace the outline of the nosecone on a sheet of paper, then reduce that by double the thickness of the wall of the cone.
Am I close Juan?

Adrian

I just cut the sled a bit smaller to the ID of the NC, and then cut two angles on the front of the sled and shaped it with a rotary tool

jd2cylman · Sep 26, 2013

jus_rockets said:
I just cut the sled a bit smaller to the ID of the NC, and then cut two angles on the front of the sled and shaped it with a rotary tool

WHAT!!!!!
NO Latin????????
OMG, how did you manage to make it work?? :confused2:

Adrian

jus_rockets · Oct 29, 2013

Well it flew great but I was not able to recover it. Lesson learned, I should of stuck with the GPS. The motor was a K550W, the predicted altitude was about 14k at 1283mph. I am pretty sure someone got a shot of it and will post it later.

Hardline · Oct 29, 2013

jus_rockets said:
Well it flew great but I was not able to recover it. Lesson learned, I should of stuck with the GPS. The motor was a K550W, the predicted altitude was about 14k at 1283mph. I am pretty sure someone got a shot of it and will post it later.

I feel bad since I was running the tracker and lost the signal. I think you are right about the GPS in that scenario. Sure was a beauty of a rocket, Juan.

SONIC JART, 54 MD build!

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