02/06/2010 Launch Photos - Northern Colorado Rocketry

This topic has 17 replies, 8 voices, and was last updated 15 years, 7 months ago by Steve Jensen.

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February 7, 2010 at 1:34 am #40911
MikeS
Moderator
It was a good day for a launch. Glad to see everyone.

It was cool but real calm.

http://picasaweb.google.com/mshinn2001/020610Launch#
February 7, 2010 at 3:24 am #52078
Steve Jensen
Participant
Appreciated the photos. My Liberty ma not fly again, except in your pictures.
February 7, 2010 at 5:53 am #52079
edward
Moderator
Oh no! What’s up? did you figure out why the chute didn’t extract itself?

Edward
February 7, 2010 at 7:08 am #52080
Chad
From the pictures it looks like the black and white V2 had a CATO. Was that what happened? What motor?
February 7, 2010 at 8:25 am #52081
slh56
Thanks for posting the pictures! It was a fun launch.

-Steven
February 7, 2010 at 11:26 pm #52082
mule
Participant
Nice pictures Mike.

Steve, I peeled off before we got to it, did it make it through the landing?
February 8, 2010 at 3:04 am #52083
Steve Jensen
Participant
thumped the Liberty pretty well.

I can fix it, but it will take tube, grinding and epoxy.

Still not certain as to the cause. Efforts included:

Shear pins, which worked.
More BP from 2.0 grams to 3.5.
Tight wrap.
Etc.

I’d like to try a piston, but after the last landing it’s not a round tube for the last 12 inches.

Maybe a deployment bag.

On the other hand, it’s a bit of a pig. Thus rebuilding will add even more weight. I learned a lot while building it: however, I have other projects ready to fly.

I really enjoyed the attempts and I’ve learned a lot in the effort. I’m on to something else.

It’s a learning experience, one which I’m enjoying. Thanks for the collective help I’ve received,
February 8, 2010 at 4:01 am #52084
John A. Wilke
Participant
That was indeed a strange set of occurences! For those not there, Steve had a chute hang up at the end of the airframe tube TWICE… It was 99% of the way out, but just didn’t quite shake loose.

I’m always interested in learning what I can from failures, whether I was the flyer or not. I looked at this project, and for the life of me, I don’t know how you get a chute to hang up at the opening TWICE. The chute had plenty of room, the charge had sufficient oomph (especially after it was nearly doubled), shock cord was long enough…. I can’t figure this one out? Thoughts?
February 8, 2010 at 4:59 am #52085
edward
Moderator
I crashed my first L1 rocket even after ground testing deployed the parachute perfectly twice! After that I switched to pistons and have been a very very happy camper.

My friend Henry (Hahn) came up with the split piston for his L1/L2 rocket and those work great – I’ll have to get pictures up on those.

Edward
February 8, 2010 at 5:03 am #52086
MikeS
Moderator
I was there also. Very strange. At 3.5 grams of powder there should
have been a pretty good boom. Any more, I think would cause other
problems.

I have never used shear pins. What He showed Me was pretty well
done. Had copper or brass plates to make sure the shear happened.
And it did.

Guess….If the delay was too short and the rocket was till moving
up. The cone would not have enough poop to pull away from the
rocket. ??

I think possably also. The length of cord from the cone to the chute
may need to be a little shorter. less distance to travel before pulling
at the chute. Photo 111 and 112.
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