Monday, November 19, 2018

0.018" matters...

I had a batch of end caps machined for the Carbon tube tank.
This was 4" outer, 0.035 metal liner 0.009  poly bag, and 0.004 gap.
This was all carefully measured and tested, it works well...

I thought I could reuse these end caps in the 4" 035 wall tube, alas I neglected to account for the bag.
The 0.009 on both sides or 0.0018 in diameter is enough that the caps don't seal correctly.....
Grumble Grumble....
I could line the aluminum tube with the bag and continue....


Not a huge deal, but I thought I had enough for 3 sets of flight hardware, now I have zero...
I need to machine new ones...

So even with the loose fit, I thought I'd assemble the tank and  hydro test one.
The end cap retention failed at 420PSI. The cap retaining screws failed in shear.
In hind sight I did not use enough screws, according to the screw stress calculations they should have failed at 390 psi.


So all in all its nice to actually be building and assembling hardware again.

So Mariellen's garden got its first dose of hydro test water, in about 4 years.

Wednesday morning update...
Rebuilt the test tank, used more screws, hydro ed
to 600 PSI without failure.






17 comments:

Robert Clark said...

I wonder if you could do a flight to the 100 km von Karman for suborbital space before doing a fully orbital rocket. Even this is sufficiently challenging that there has been a $1 million prize competition established for a flight to this altitude for a single stage liquid-fueled rocket by a university team.

Accomplishing this altitude can be made easier by using both carbon fiber for the propellant tanks and an aerospike nozzle. Amateur rocketeers working with solid rockets have been building their own carbon fiber casings for a while now. You can probably purchase one at the 4” diameter you need.

Surprisingly, an actual test of an aerospike nozzle still hasn’t been done at near vacuum conditions despite the fact the aerospike has been known of since the 60’s. The highest it has been tested is about 30,000 feet where the air density is still 1/3rd that at sea level. But even getting to 100,000 feet the air density is 1/100th that at sea level where the performance will be at near the vacuum levels. So even getting to this altitude will be a significant.advance in testing the aerospike.

Bob Clark

Monroe said...

I can machine you some caps if you want.

AjayKM said...

Good post thanks for sharing salivary

sanchesginger@gmail.com said...

Any little thing has a very big impact because from the change in the main parameters, www.findwritingservice.com/blog/dissertation-proofreading-personal-bucket-list the result that may completely not suit you can be distorted.

importance of English literacy recommended page said...

I needed some time to understand what all these numbers meant. Now, I understand and it doesn't seem difficult to me anymore.

Blogger said...

According to Stanford Medical, It's in fact the one and ONLY reason women in this country live 10 years longer and weigh an average of 42 lbs less than us.

(And by the way, it is not related to genetics or some secret exercise and absolutely EVERYTHING related to "HOW" they eat.)

BTW, What I said is "HOW", and not "WHAT"...

Click on this link to find out if this little quiz can help you release your real weight loss potential

Lorriel Sims said...

Whom You Know Matters: Venture Capital Networks and Investment Performance www.landclearingofwa.com/

Qwik Aid said...

Thank you for giving this useful information. Continue to share informative posts with us.
AT&T is a well-known internet service provider in the United States and Canada. Aside from the Internet, AT&T offers its customers email service. The AT&T webmail account, like any other email account, is protected by a user ID and password combination. It is obvious that many users Change AT&T Email Password to keep their email account secure. You can also call our toll-free number and speak with one of our customer service representatives to easily resolve your issues.

Ragani Tiwari said...

Very Informative Post. Thanks for sharing with us.
Akshi is most trusted Rolling Mills Manufacturers, Exporters & Suppliers in India. We offer wide range of top-quality Rolling Mill Plants that is perfect to performing steel making process. We are capable to complete our consignments on time as per client requirements. To know more further details, you can visit our website.

Divya Chauhan said...

We at Bajrangi Astro make available all kinds of astrological services. The firm is active since 1999 as Bajrangi Dham, which was given a new name in 2016. If you want to know about why you are facing problem in married life, or any other aspect of life such as career, finance, etc. visit our website. You can also contact us through a call or by dropping a mail.

Michael said...

I wonder if you could do a flight to the 100 km von Karman for suborbital space before doing a fully orbital rocket, you can get help online assignment writing service uk as there is an article about this procedure.

lhuwellad1 said...

토토사이트 Thanks for such a great post and the review, I am totally impressed! Keep stuff like this coming.

lhuwellad1 said...

Hurrah! In the end I got a webpage from where I be capable 토토
of genuinely get useful information regarding my study and knowledge.

فروش فوری سیم کارت said...

I never meant to cause you any sorrow. I never meant to cause you any pain. I only wanted to one time see you laughing. I only wanted to see you laughing in the purple rain.



خرید سیم کارت 0912

pg slot (หน้าหลัก) said...

สล็อต PGSLOTแตกง่าย เล่นง่ายได้เงินจริงผู้ให้บริการเกมสล็อต pg slot ออนไลน์บนโทรศัพท์เคลื่อนที่ที่มีเกมนานาประการให้เลือก เป็นเกมรูปแบบใหม่ที่ทำเงินให้ผู้เล่นได้เงินจริง 

pg slot auto said...

pg slot auto Pg Auto ทางเข้าเล่น หรือ pgslot-th เกมพีจีสล็อจ pg สล็อตออนไลน์ (pg slot auto) จากค่าย pg soft และก็ บาคาร่า ออนไลน์ ที่มาใน รูปแบบใหม่ เป็นเกมส์ ยอดฮิต

My Translation Services said...

Looking for top-notch Portuguese translation services UK? Look no further than mytranslationservices.com. With a team of skilled linguists and translators, we specialize in providing accurate and reliable translations from Portuguese to English and vice versa. Whether you need legal documents, business contracts, or personal correspondence translated, our professional and experienced translators ensure that your message is conveyed effectively and accurately. Trust mytranslationservices.com for all your Portuguese translation needs in the UK.