What did you do rocket wise today?

[Papa Elf]

I've been wondering for a while: are these glued in position, or are they free to move like a rattle? The latter would be neat.
View attachment 675675

They are glued into place. I do suspect the original Centuri Scorpion the rings were a tad shorter though.

 

[bjphoenix]

I'm late posting this but we had our club small field launch yesterday. We have a small field owned by city of Arlington parks department. It is an odd shaped field and we can only allow up to D impulse launches. It has been rainy in our area and there was light rain on the way to the field. The rain stopped before our scheduled start time, we launched for a couple of hours then another wave of rain moved in so we packed up and left. I only launched one rocket myself but talked to friends and did some photography. I came home with 136 photos of which there were about 18 actual launches. All of my photos are posted on the NAR facebook page. Here is John Palmer's Atlas-Agena on a D12.

 

[4regt4]

View attachment 675636

That's really nice!

I always take a beauty shot of my finished rockets, as they end up looking like crap after a few flights. Oh well.

Hans.

 

[mitchboese]

You could probably just buy some lube from the autoparts store too. I use MobilOne synthetic grease on my reloads. You don't "have" to use superlube, unless the stores are close enough.

 

[KenECoyote]

Launched my 4"D X-15 on a J425. Great flight! Over a dozen flights by now.
View attachment 675529

View attachment 675543

Speaking of beauty shots...

My daughter sent me a pic she took. I wasn’t trying to model or pose (especially not with a fanny pack) , I was totally unaware!

 

[Greg Furtman]

Speaking of beauty shots...

My daughter sent me a pic she took. I wasn’t trying to model or pose (especially not with a fanny pack) , I was totally unaware!
View attachment 675734

Isn't that a belly pack?

 

[Hobie1dog]

sanded the second coat of primer on 5 rockets

 

[VAXman]

Through convolution? Do tell. Euler's theorem (this Euler's theorem; there are many. Euler was a god of mathematics) is easy enough to demonstrate through the the McLaurin series, but through convolution? I'm intrigued.

SMH. Reading comprehension. I said Fourier transform.

 

[jqavins]

Isn't that a belly pack?

Um, well, a fanny pack is called that because of what it covers, not where it's worn. So I think it's a pelvis pack. Yeah, that'll do; let's go with "pelvis".

 

[jqavins]

SMH. Reading comprehension. I said Fourier transform.

Oh, wait a minute. You meant "through convolution" as is up to and including convolution as an aspect of the discussion. Sorry, I read "through" to mean that convolution was the means of explaining. Like "I explained to them the transform from Euler... [by way of] convolution."

 

[PaddyDaddy]

Epoxied in the motor mount/ tailcone for the level 1 certification rocket my son and I are building

 

[VAXman]

Oh, wait a minute. You meant "through convolution" as is up to and including convolution as an aspect of the discussion. Sorry, I read "through" to mean that convolution was the means of explaining. Like "I explained to them the transform from Euler... [by way of] convolution."

One needs to appreciate Euler for Fourier transformation

ie. ∫f(t)e <sup>-𝒋𝛚t,/sup> dt

In terms of, for example, carrier modulation, the unmodulated carrier (assume the cosine to eliminate the negative consequences of the transform) produces two Dirac deltas at ± the frequency. The convolution becomes necessary when considering the modulation of the carrier. The result is the signal's modulation function transform convolved with the Dirac. The result is that the modulation signal's transform is centered over each of the carrier Diracs.

 

[Art Upton]

I read the newest version of our Club Newsletter.

Here is the JMRC/Huvars 'Total Impulse' award wining newsletter:

https://cv41.org/newsletters/V24I5.pdf

 

[jqavins]

One needs to appreciate Euler for Fourier transformation

ie. ∫f(t)e <sup>-𝒋𝛚t,/sup> dt

In terms of, for example, carrier modulation, the unmodulated carrier (assume the cosine to eliminate the negative consequences of the transform) produces two Dirac deltas at ± the frequency. The convolution becomes necessary when considering the modulation of the carrier. The result is the signal's modulation function transform convolved with the Dirac. The result is that the modulation signal's transform is centered over each of the carrier Diracs.

Yes, all true, and well known to me. What seemed so intriguing, due to a misunderstanding, was the ide that you had explained to someone "Here's what the Fourier transform is about, and here's how you do it, and let me explain it to you by starting with convolutions." That would be something I'd like to know more about: start with convolutions and use them to explain Fourier and/or Euler. But that's not what you meant.

Incidentally, in the BBCode used here, the key to displaying superscripts and subscripts is to NOT use [code] tags. [Code] tags disable all the other tags that you use to format the text. So, with [code] tags I'll get

∫f(t)∙e[sup]-𝒋𝛚t[/sup]dt

and when I remove those I get
∫f(t)∙e^-𝒋𝛚tdt

 

[Sooner Boomer]

Went to neighbors to avoid election coverage. I was able to use her internet to upload my latest video of my ET DD rocket. Almost landed in a bucket of water! here's the link:

 

[Hobie1dog]

Finished more sanding on the 8 rockets now ready to paint

 

[Art Upton]

 

[Sooner Boomer]

View attachment 675963

That was too close! Landed between two buckets of water. Not set up for splashdown!

 

[Ronz Rocketz]

Went to neighbors to avoid election coverage. I was able to use her internet to upload my latest video of my ET DD rocket. Almost landed in a bucket of water! here's the link:

I successfully ground tested the EZ-DD main and the LOC-IV main today. Almost ready for this Saturday's launch. I'm waiting for a part to come in tomorrow that I screwed up on the Apogee altimeter.

 

[bjphoenix]

Um, well, a fanny pack is called that because of what it covers, not where it's worn. So I think it's a pelvis pack. Yeah, that'll do; let's go with "pelvis".

I have been thinking about getting a fanny pack to use at launches, these days they're called "belt packs" or "sling packs" and can be worn over the shoulder or around the waist. I usually have a cellphone, car keys, pocket knife, maybe other tools, in my pants pockets. Stomping around a launch field with rough terrain and tall grass and weeds it would be a disaster to lose my car keys or whatever. I'm usually wearing cargo shorts but my cargo shorts don't have totally secure pockets. If I had a pack that I could put everything in it could be more secure. So I spent a lot of time searching products on Amazon and viewing product reviews on youtube. I also do a lot of launch photography and usually carry my camera around with a long lens on it. So my search evolved into looking for large sling packs that could also carry the camera for times when I wanted my hands free. Packs like that made for photography are fairly expensive, I just want something for occasional use.

Otherwise today I did some sanding and masking on a couple of rockets and then then did a little bit of painting. We had rain and high humidity over the past few days but today was clear enough for painting.

 

[BunnyBoots]

I've been wondering for a while: are these glued in position, or are they free to move like a rattle? The latter would be neat.
View attachment 675675

I Glued mine on as per step 23 in the plans

 

[KenECoyote]

Isn't that a belly pack?

Um, well, a fanny pack is called that because of what it covers, not where it's worn. So I think it's a pelvis pack. Yeah, that'll do; let's go with "pelvis".

How about Belly Bag or Pooch Pouch?

 

[Art Upton]

That was too close! Landed between two buckets of water. Not set up for splashdown!

In all the years I marketed and flew real time transmitted on-board rocket video...

THAT TAKES THE BUCKET LIST

 

[Art Upton]

I have been thinking about getting a fanny pack to use at launches, these days they're called "belt packs" or "sling packs" and can be worn over the shoulder or around the waist. I usually have a cellphone, car keys, pocket knife, maybe other tools, in my pants pockets. Stomping around a launch field with rough terrain and tall grass and weeds it would be a disaster to lose my car keys or whatever. I'm usually wearing cargo shorts but my cargo shorts don't have totally secure pockets. If I had a pack that I could put everything in it could be more secure. So I spent a lot of time searching products on Amazon and viewing product reviews on youtube. I also do a lot of launch photography and usually carry my camera around with a long lens on it. So my search evolved into looking for large sling packs that could also carry the camera for times when I wanted my hands free. Packs like that made for photography are fairly expensive, I just want something for occasional use.

Otherwise today I did some sanding and masking on a couple of rockets and then then did a little bit of painting. We had rain and high humidity over the past few days but today was clear enough for painting.

Some tactical cargo pants have a metal ring on a sewn flap over the right side pocket. I have 3 of those.
You have a lanyard that runs from your keys to that ring so they can't leave you even if they fall out of your 'deep' pocket. Those 'main' pockets are so deep you would have to be upside down for them to fall out. The main thing they prevent is you putting your hand in the pocket and pulling them out by accident.

Some of those type pants also have Velcro on the rear pants 'main' pockets. A couple type also have secondary rear slit pockets, as well as secondary front slit pockets. One pair I have those slits hold my cell phone in really tight.

Another has a left side long skinny pocket with a Velcro flap over it that holds a phone nice. Those rear slits hold things like screw drivers and channel lock pliers nice, and the main rear holds a roll of masking tape. Good for carrying your 'Kit' * as you walk to the far pads.

I don't wear shorts to rocket launches, and at a couple NARAMs a couple decades ago i saw folks in shorts with their legs all cut up from the under brush. Solidified more reason to forget shorts.

* Kit as used by the Brits, meaning your 'Stuff'

 

[Art Upton]

Speaking of beauty shots...

My daughter sent me a pic she took. I wasn’t trying to model or pose (especially not with a fanny pack) , I was totally unaware!
View attachment 675734

Ken, Outstanding in his field

 

[Greg Furtman]

Um, well, a fanny pack is called that because of what it covers, not where it's worn. So I think it's a pelvis pack. Yeah, that'll do; let's go with "pelvis".

Could it be called a codpiece?

 

[jqavins]

I have been thinking about getting a fanny pack to use at launches...

That gives me an interesting closely related idea. Maybe I'll get a small cheap one to hold spare igniters, steel wool and alcohol wipes, a tube of dry lube, extra igniters, and anything else I might suddenly find I need while out at the pad. You've carried out your prepped rocket, and how often do you go back for something?

 

[VAXman]

Yes, all true, and well known to me. What seemed so intriguing, due to a misunderstanding, was the ide that you had explained to someone "Here's what the Fourier transform is about, and here's how you do it, and let me explain it to you by starting with convolutions." That would be something I'd like to know more about: start with convolutions and use them to explain Fourier and/or Euler. But that's not what you meant.

Incidentally, in the BBCode used here, the key to displaying superscripts and subscripts is to NOT use

 tags. [Code] tags disable all the other tags that you use to format the text. So, with [code] tags I'll get
[code]∫f(t)∙e[sup]-𝒋𝛚t[/sup]dt

and when I remove those I get
∫f(t)∙e^-𝒋𝛚tdt

I DID NOT START with convolution.

I'm almost sorry I've mentioned it now. Next time, which glue is superior.

 

[jqavins]

I DID NOT START with convolution.

Yes, I know that now. That, as I've stated three times now, was my original misunderstanding.
-------------------------------
I checked motorcato.org this morning to see if other people have had the same problem with the Q-Jet C18 that I did on Saturday. Yes, there have been a few. I also noticed that that site is run by the same rocketry hero as thrustcurve.org. Thank you @JohnCoker!

 

[jqavins]

Went to neighbors to avoid election coverage. I was able to use her internet to upload my latest video of my ET DD rocket. Almost landed in a bucket of water! here's the link:

Also went amazingly straight up and down. There must have been no wind at all.