Mrkoldkuts
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Has anyone build the Jart and are you happy with it ? Thanks !
Wildman 5 inch Jart
- Thread starter Mrkoldkuts
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blackjack2564
Crazy Jim's Gone Banana's
I have the 4in Jart. Great rocket, small size, dual deploy. Easy to travel handles 38& 54 motors.
My build thread from Black Sat 2013 when Jarts were introduced. Wow how time flies, seems like last year not 6.
https://www.rocketryforum.com/threa...o-jart-4-in-dd-in-nc-or-any-jart-build.60755/
My build thread from Black Sat 2013 when Jarts were introduced. Wow how time flies, seems like last year not 6.
https://www.rocketryforum.com/threa...o-jart-4-in-dd-in-nc-or-any-jart-build.60755/
cavecentral
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I bought 2 when first introduced. They fly nice. One is lost in a field. Both were built before I knew about head end dual deploy. I would change that in how I built them.
I also trimmed the bottom in off the fins so they were not pointy.
I also trimmed the bottom in off the fins so they were not pointy.
I just opened up my 5” Jart last week, and I’m almost done building it already, extremely easy to build, seams like a very nice rocket.
Mightyrocketman
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5” super Jart 75
Love the way it flies!
One of my favorite projects...
GRIFFIN
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What do you get for altitude on those? Interested for comparison sake.
My 2G 98 is a slower white. About a 4-5 second burn.
I built a 5" Jart in the spring of 2014. Modified it with a donut avbay so it could fly on 4 grain 75mm motors.
The avbay sled slid in next to the MM extension in the coupler, and added a 16" payload tube.
The N/C was modified with a removable coupler that allowed me to add an Eggfinder with no metal parts near it.
The first couple of flights were on 54mm motors, but it was apparent that my guess of a Cd at .7 was a bit high. First flight on a 75mm L995 to 10,123 ft. made me adjust the Cd down to .4. Another thing that became apparent was that all those modifications made it way too heavy for the fins, with a fillet cracking on the first flight and cracked fins on flights 5, 6 and 7. So I did a tip to tip fiberglass layup and added more weight, making it a real beast at over 18 lbs. Had several good flights after that, then on flight #9 I broke the drogue shock cord and had the fincan land under a 15" drogue in soft dirt with no damage.
Flight #10 was on an L1115 to 11,457 ft. and #11 was on an M1101 to 12,709 ft.
In the fall of 2017, we started casting 75mm research motors, so "Jughead" was fed a steady diet of 4 grain 75's, which usually flew to 11,500 ft. On flight #15 it cracked another fin, despite the 96" Top Flight chute I was using at the time. Flight #17 it suffered another drogue shock cord failure and cracked two fins and damaged the fincan body tube. No soft dirt landing on that flight.
In four years it made 17 flights. Now I'm cannibalizing it's avionics for other rockets and have removed the recovery parts. I kinda researched rebuilding the fincan into something that would hold my 76/10,000 research motor, which is 56" long, but that won't happen any time soon, and I would definitely use a more robust fin that didn't stick down like the Jart fins did.
The avbay sled slid in next to the MM extension in the coupler, and added a 16" payload tube.
The N/C was modified with a removable coupler that allowed me to add an Eggfinder with no metal parts near it.
The first couple of flights were on 54mm motors, but it was apparent that my guess of a Cd at .7 was a bit high. First flight on a 75mm L995 to 10,123 ft. made me adjust the Cd down to .4. Another thing that became apparent was that all those modifications made it way too heavy for the fins, with a fillet cracking on the first flight and cracked fins on flights 5, 6 and 7. So I did a tip to tip fiberglass layup and added more weight, making it a real beast at over 18 lbs. Had several good flights after that, then on flight #9 I broke the drogue shock cord and had the fincan land under a 15" drogue in soft dirt with no damage.
Flight #10 was on an L1115 to 11,457 ft. and #11 was on an M1101 to 12,709 ft.
In the fall of 2017, we started casting 75mm research motors, so "Jughead" was fed a steady diet of 4 grain 75's, which usually flew to 11,500 ft. On flight #15 it cracked another fin, despite the 96" Top Flight chute I was using at the time. Flight #17 it suffered another drogue shock cord failure and cracked two fins and damaged the fincan body tube. No soft dirt landing on that flight.
In four years it made 17 flights. Now I'm cannibalizing it's avionics for other rockets and have removed the recovery parts. I kinda researched rebuilding the fincan into something that would hold my 76/10,000 research motor, which is 56" long, but that won't happen any time soon, and I would definitely use a more robust fin that didn't stick down like the Jart fins did.
WTH? Those aren't Jarts! These are Jarts. https://www.ebluejay.com/item/6731904
Show me a 54 mm version of one of these babies and I'll be impressed.
Show me a 54 mm version of one of these babies and I'll be impressed.
rharshberger
Well-Known Member
With scale recovery? [emoji3]
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I don’t remember the name of the show, but there was a show on Science Channel, IIRC, that was a rocketry based contest show, and on one episode they built rocket powered lawn darts. I remember a few big names in the hobby were involved. I think Pat G was one of them.
EDIT: the show was Master Blasters. I cannot find a clip of the lawn darts episode, though....
Last edited:
rharshberger
Well-Known Member
I remember Master Blasters, iirc they did a "space shuttle" with a British Robin car.
Edit: the Robin space shuttle was Top Gear.
Edit: the Robin space shuttle was Top Gear.
Followed this thread as I've been looking for a shorter, larger diameter and all fiberglass non-electric 54mm bird.
Ordered one yesterday and I'm looking forward to "over building" (current buzz word) the new JART. Plain and simple will get the job done. Might upgrade to the AvBay option down the road but I'm not in any hurry, as I really think this will make a great all purpose all round sport flyer.
Thanks to all who posted their JARTS
Ordered one yesterday and I'm looking forward to "over building" (current buzz word) the new JART. Plain and simple will get the job done. Might upgrade to the AvBay option down the road but I'm not in any hurry, as I really think this will make a great all purpose all round sport flyer.
Thanks to all who posted their JARTS
KenRico
'Just the Tip'
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I built a 5" Jart in the spring of 2014. Modified it with a donut avbay so it could fly on 4 grain 75mm motors...
...
In four years it made 17 flights. Now I'm cannibalizing it's avionics for other rockets and have removed the recovery parts. I kinda researched rebuilding the fincan into something that would hold my 76/10,000 research motor, which is 56" long, but that won't happen any time soon, and I would definitely use a more robust fin that didn't stick down like the Jart fins did.
I would suggest using nosecone as the start of a 5 inch ShapeShifter for some EX thrashing !
Kenny
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I built a 5" Jart in the spring of 2014. Modified it with a donut avbay so it could fly on 4 grain 75mm motors.
You must have had a rough landing that Par 96 should have got the job done.
The avbay sled slid in next to the MM extension in the coupler, and added a 16" payload tube.
The N/C was modified with a removable coupler that allowed me to add an Eggfinder with no metal parts near it.
The first couple of flights were on 54mm motors, but it was apparent that my guess of a Cd at .7 was a bit high. First flight on a 75mm L995 to 10,123 ft. made me adjust the Cd down to .4. Another thing that became apparent was that all those modifications made it way too heavy for the fins, with a fillet cracking on the first flight and cracked fins on flights 5, 6 and 7. So I did a tip to tip fiberglass layup and added more weight, making it a real beast at over 18 lbs. Had several good flights after that, then on flight #9 I broke the drogue shock cord and had the fincan land under a 15" drogue in soft dirt with no damage.
Flight #10 was on an L1115 to 11,457 ft. and #11 was on an M1101 to 12,709 ft.
In the fall of 2017, we started casting 75mm research motors, so "Jughead" was fed a steady diet of 4 grain 75's, which usually flew to 11,500 ft. On flight #15 it cracked another fin, despite the 96" Top Flight chute I was using at the time. Flight #17 it suffered another drogue shock cord failure and cracked two fins and damaged the fincan body tube. No soft dirt landing on that flight.
In four years it made 17 flights. Now I'm cannibalizing it's avionics for other rockets and have removed the recovery parts. I kinda researched rebuilding the fincan into something that would hold my 76/10,000 research motor, which is 56" long, but that won't happen any time soon, and I would definitely use a more robust fin that didn't stick down like the Jart fins did.
