PRO-38 - Northern Colorado Rocketry

This topic has 50 replies, 7 voices, and was last updated 18 years, 8 months ago by denverdoc.

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January 4, 2007 at 2:24 am #43789
Chris LaPanse
I know you can get K250’s now, but they’re about the priciest K motors around ($200-$250). Wonderful though, as a 10 second full K.
January 5, 2007 at 2:27 am #43790
Anonymous
The K250 is now something like an 82% K. It used to be a very full K, but when it was recertified, they went to the lower impulse.

I believe I may have flown the last full K250 in captivity last fall. It was cool, though it chuffed a bit off the pad. This particular motor was something like 10 years old. The flight simmed to about 25K, but I ended up with a shade under 21K. I was sad and happy at the same time – sad I didn’t get the 25K, and happy because clean recovery over 20K is *tough*.

J
January 5, 2007 at 3:02 am #43791
Bruce R. Schaefer
I believe I may have flown the last full K250 in captivity last fall.

JW, I remember seeing that flight, and it was very impressive. 🙂
January 5, 2007 at 3:48 am #43792
Chris LaPanse
Agreed, and now that you mention it, I think you’re right – it’s an 80something percent K now. Because of that, I seriously doubt the current K record will fall anytime soon…

Still a cool motor though 😎
January 5, 2007 at 4:02 am #43793
denverdoc
which makes the Loki K350 priced at around 100 dollars on discount at 2374N-s (85percent K)–a real bargain in my view.
JS
January 5, 2007 at 4:03 am #43794
denverdoc
ignore this
January 5, 2007 at 5:53 am #43795
Chris LaPanse
Definitely – the Loki K350 is a wonderful choice for a moonburner K now, and a lot easier on the wallet than the Aerotech offering.
January 5, 2007 at 4:09 pm #43796
Anonymous
Agreed, and now that you mention it, I think you’re right – it’s an 80something percent K now. Because of that, I seriously doubt the current K record will fall anytime soon…

Still a cool motor though 😎

There were a ton of records smashed late this year, September 23 & 24 at Black Rock. Check out http://www.tripoli.org/records/single.shtml Most of those are beyond comprehension to me. Those guys had a full “K” in their boost as well. Note that the J record is now over 19K.

I used to be competitive with some of those guys. Not after that weekend!
January 5, 2007 at 4:16 pm #43797
Anonymous
Definitely – the Loki K350 is a wonderful choice for a moonburner K now, and a lot easier on the wallet than the Aerotech offering.

Anytime you get away from the single use, it sure helps the wallet… but it does hurt performance-wise. The Loki is a *wonderful* motor, but it is a bit heavier (not good for altitude), a lot longer (WAY not good for altitude) and it gives up a couple hundred NS. That said, if I ever do a 2 stage blast, that will probably be up in the sustainer…

JW
January 5, 2007 at 9:34 pm #43798
Chris LaPanse
Agreed, and now that you mention it, I think you’re right – it’s an 80something percent K now. Because of that, I seriously doubt the current K record will fall anytime soon…

Still a cool motor though 😎

There were a ton of records smashed late this year, September 23 & 24 at Black Rock. Check out http://www.tripoli.org/records/single.shtml Most of those are beyond comprehension to me. Those guys had a full “K” in their boost as well. Note that the J record is now over 19K.

I used to be competitive with some of those guys. Not after that weekend!

Interesting…

One record that I think will fall pretty soon is that L record – it is only 50 feet higher than the K record.

The K250 used for that was an older one, right?
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