John, you are a darn good speaker. I have watched several of your videos. No "ums" or "ahs" in your speech. You are highly articulate. I need to practice to be more like you!! (And I'm a trial lawyer.)
Thanks for the kind words. However, credit really goes to video editing. In trial you don't get to re-shoot if you don't like the way something sounded. :)
Okay, so after recognizing that the band Rush is a set of human metronomes. I have come to the realization that John Coker with this numerous references throughout, is the human hyperlink. As usual, very informative, thanks for sharing your skills!
Hi John. Thanks for making these videos and maintaining a very informative web page. Invaluable technique and construction methods. I am curious on this rocket how you load and seal the forward ejection charge?? Another of your videos has you using poster tack and tape. Seems tough with it bonded in there. I get how you could leave the wire long and thread it, it’s the sealing aspect. Thanks Clinton
I generally make sure the bay is removable, so you can easily get at both ends. It is possible to reach into a 3.9" airframe, but it's easier not to have to.
John thank you for your video, they are really a blessing! May I ask which is the best way of doing the fin slots on the same tube that comes without? I am doing a scratch build and I am not sure of the best technique. Many thanks!
For paper tubes, probably just marking and cutting with a sharp knife. For phenolic and fiberglass tubes you can use a router: jcrocket.com/finslots.shtml
Hi, John, my daughter and I have been bitten by High Powered Rocketry bug. Your videos are invaluable. I have so many questions, such as why do we need to find the center of gravity of the rocket?
Part of safe flying is to make sure your rocket will fly properly. Making sure it will be stable requires ensuring the center of gravity is ahead of the center of pressure. The former is measured and the latter is calculated. Here's more info on stability: spaceflightsystems.grc.nasa.gov/education/rocket/rktstab.html
Great videos John, really appreciate them. In this video and your Level 1 video, you use a simple CG Jig. What is the black plastic piece made from? Did you 3D print it or is it just a piece of plastic you took from something else? Thanks!
Although this message is 8 months old, I had my cert level for NAR/TRA and was able to strike up a conversation about it with a recruiter from Edwards AFB who also launched rockets at FAR and ROC. So in a sense, it might help you strike up conversations with recruiters who can recommend you, but moving forward with the job application process it might not help vs. having a dofferemt skill like CAD or matlab or whatever. Keep in mind my major is in aerospace engineering. But mechE and AeroE are relatively similar enough.
John, you are a darn good speaker. I have watched several of your videos. No "ums" or "ahs" in your speech. You are highly articulate. I need to practice to be more like you!! (And I'm a trial lawyer.)
Thanks for the kind words. However, credit really goes to video editing. In trial you don't get to re-shoot if you don't like the way something sounded. :)
Okay, so after recognizing that the band Rush is a set of human metronomes. I have come to the realization that John Coker with this numerous references throughout, is the human hyperlink. As usual, very informative, thanks for sharing your skills!
The Jolly Logic Chute Release totally changes the dual deployment game. It makes it much simpler.
The "Rose Retainer" shows your age in the hobby John. :) I still have one too.
Excellent I enjoyed this video Thank you Willy the Netherlands
Awesome video! Where's the best place to study or practice test for the level 2 questionnaire?
NAR: www.nar.org/pdf/sec-A.htm
TRA: liars.org/Level2/Index.html
Not sure how official the second one is, but it seems OK.
very informative , thanks a bunch
Hi John. Thanks for making these videos and maintaining a very informative web page. Invaluable technique and construction methods.
I am curious on this rocket how you load and seal the forward ejection charge?? Another of your videos has you using poster tack and tape. Seems tough with it bonded in there. I get how you could leave the wire long and thread it, it’s the sealing aspect. Thanks Clinton
I generally make sure the bay is removable, so you can easily get at both ends. It is possible to reach into a 3.9" airframe, but it's easier not to have to.
John thank you for your video, they are really a blessing! May I ask which is the best way of doing the fin slots on the same tube that comes without? I am doing a scratch build and I am not sure of the best technique. Many thanks!
For paper tubes, probably just marking and cutting with a sharp knife. For phenolic and fiberglass tubes you can use a router: jcrocket.com/finslots.shtml
Hi, John, my daughter and I have been bitten by High Powered Rocketry bug. Your videos are invaluable. I have so many questions, such as why do we need to find the center of gravity of the rocket?
Part of safe flying is to make sure your rocket will fly properly. Making sure it will be stable requires ensuring the center of gravity is ahead of the center of pressure. The former is measured and the latter is calculated. Here's more info on stability: spaceflightsystems.grc.nasa.gov/education/rocket/rktstab.html
Excellent info. Thx!
Great videos John, really appreciate them. In this video and your Level 1 video, you use a simple CG Jig. What is the black plastic piece made from? Did you 3D print it or is it just a piece of plastic you took from something else? Thanks!
That is just a piece of weather stripping (tape-backed neoprene).
@@JohnLCoker Perfect, thanks for the reply!
Hey John! I’m having a dilemma about using shear pins. Am I able to get away with NOT using shear pins on my cardbord 4” diameter rocket?
Yes. The downside is that you may have separation of both openings, which would deploy the main early and defeat the dual-deployment setup.
@@JohnLCoker I’m gonna stick with shear pins. Probably just harden the areas where the pins will shear so the cardboard doesn’t distort
Well presented. Nice vid.
How can i contact you ? To ask some questions
your videos are always amazing!
Excellent
Is the best my bos.
Can you put certification on your resume or does it hold no merit?
I wouldn't imagine it would help, unless you were looking for a job in aerospace.
I am. I was hoping it would show my interest in the Aerospace field even though im majoring in mechanical engineering at the moment.
Although this message is 8 months old, I had my cert level for NAR/TRA and was able to strike up a conversation about it with a recruiter from Edwards AFB who also launched rockets at FAR and ROC. So in a sense, it might help you strike up conversations with recruiters who can recommend you, but moving forward with the job application process it might not help vs. having a dofferemt skill like CAD or matlab or whatever. Keep in mind my major is in aerospace engineering. But mechE and AeroE are relatively similar enough.
I have not seen you fly your LOC rockets !! Please video those if possible.
You're right, I should take more flight videos.
Great video! What kind of retainer is that?
That's a "Rowe's Retainers" unit I had lying around. I don't think they are made any longer, sadly.
John Coker Thats too bad, looks like a really nice retainer.
Do you bevel your fins?
Yes, usually. Here's my article on that: jcrocket.com/finbevels.shtml