Question came up today about the AeroTech, 38mm J520 status?
Anyone know ?
Ken Weaver
Anyone know ?
Ken Weaver
Yeah, pretty much what Mark said. Last I recall Aerotech was looking to dial in the delay using some wizardry and ultimately get it certified with an adjustable delay.
So I gather that the motor is currently not shipping?
Any idea when it will be available?
Aerotech just published their updated motor matrix:
https://www.aerotech-rocketry.com/uploads/ee48070d-66f2-43c9-ab82-d57f299f8c2b_AeroTech Master Motor Matrix 7-3-18 Sheet1.pdf
The J520 is missing, so I would conclude the motor is not currently in production.
I think there is a high demand for L2 cert flights on a rocket with the chute releaseI flew one to 11,500ft in a Go Devil 38 last year. Just my opinion I didnt think there would be enough demand for the delay version.
See my comments, I disagree. The impulse of this motor makes it perfect for L2 certs with motor ejectionAnything worth flying this in, there aren’t delays for.
Plug it and ship it
Yeah, even though this reload uses the long 1080 case, it only has ~731 ns. By comparison, the classic J350 in the 720 case has ~698 ns and the "regular" J570 White Lightning reload for the 1080 case has ~973 ns.
I'm not very techy when it comes to rockets but how would you dial a delay in? Isn't that the point of the delay drilling tool and Rocksim/OpenRocket? I heard this is also a problem with the Redline propellant in the 29/40-120 casing and why they stopped selling the G71R for it
I'm not very techy when it comes to rockets but how would you dial a delay in? Isn't that the point of the delay drilling tool and Rocksim/OpenRocket? I heard this is also a problem with the Redline propellant in the 29/40-120 casing and why they stopped selling the G71R for it
J520W-13As are available at a significant discount right now from BMS.
https://www.balsamachining.com/HPM7.HTM
Mine shipped with a motor date code of 09041802.
Be advised these are RMS-EZ reloads and require the 38FCRR retaining ring closure. Contrary to the AT EZ bulletin on 7/14/2015, they do NOT ship with a normal CRDK if you want to use your normal RMS forward closures that have functioned without fail for the last 20 years.
J520W-13As are available at a significant discount right now from BMS.
https://www.balsamachining.com/HPM7.HTM
Mine shipped with a motor date code of 09041802.
Be advised these are RMS-EZ reloads and require the 38FCRR retaining ring closure. Contrary to the AT EZ bulletin on 7/14/2015, they do NOT ship with a normal CRDK if you want to use your normal RMS forward closures that have functioned without fail for the last 20 years.
The J520 looks like a wasteful motor , in my opinion . The MSRP for the 730ns J520 is $85~ dollars vs $60~ for a 700ns J500. So you are getting basicly the impulse of a E15 for $25~ . If you where to order 2 J500's , the shipped price with hazmat would be cheaper then ordering 2 J520's without hazmat. Then you have to look at the cost of the 1080 case , assuming the flyer does not have one . Aerotech would have been better off redesigning a high impulse thrust load for the 38/720 case to be easy access . Instead , they opened the cores of a J570 till it met the requirements. If they had simply say , cut the grains of a J500 in half , so they can legally ship the motor non hazmat , then had the user glue the 12 small grain segments together to form 6 normal grains , they could have saved time and money , since this seems like a scheme to make a three non hazmat loads to compete with Brand L that does the same .
J520 is actually around $70.J-500 and J-350 are both retail $73 as of october 2018 update and require hazmat, not $60., J-520 is $86 and non hazmat, so $13 more. Casing is $5 more for the longer case, so pretty irrelevent if you don't have it. So it would take more than 2 to get even....The BMS sale is over. This info is from my direct Dealer price list I got from Aerotech at the end of October.
....The BMS sale is over.
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