An "R"-powered rocket build
- Thread starter Rail Dawg
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Rail Dawg
Always learning!!!
Can’t talk motors too much here but started the Q pour today.
It’s pretty darn cool. Lots of good hard work in this area ahead.
Progress made on the ballistic drogue. Picked up a 15’ Rocketman. The thing is bulletproof.
It’s coming together guys.
Chuck C.
It’s pretty darn cool. Lots of good hard work in this area ahead.
Progress made on the ballistic drogue. Picked up a 15’ Rocketman. The thing is bulletproof.
It’s coming together guys.
Chuck C.
blackjack2564
Crazy Jim's Gone Banana's
OK to talk motors, just not formula's.
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Will the Q and R use the same case just different grains?
Rail Dawg
Always learning!!!
Oh ok cool! Didn’t know that.
Takes a few hours just to cast 1 grain of propellant. The last 45 minutes of the pour are when it gets the busiest. Am lucky to have some of the best mentors in the business.
Also was given a new 35 ft orange and white man-rated parachute. Descent calculator shows 21 fps descent rate which is a little too fast so need to keep thinking on that issue.
On another note lots of college rocket teams out there (140?) wanting to “launch a rocket into space”. As many of us know easier said than done but I think it’s great for the hobby.
As we build this “R” rocket it plays right into what they are working on.
What do you guys think?
Chuck C.
I think it’s wonderful that students want to launch into space. I’m pretty sure many of us would be interested in doing that. However, that makes it more important than ever that we work with them to help them understand the inherent risks and to learn safe practices.
If you built a minimum diameter booster for your "R" motor and put a long burn minimum diameter 4" sustainer on top...I suspect you'd be in that neighborhood
formulas have to be in the restricted research area
Chuck,
How much mass is involved with the 21 FPS Descent Rate with that 35 ft Parachute ?
It might be OK, if the "UpChuckR" is brought down in two pieces . . .
As for "Space", the upcoming "S" motor, in a minimum-diameter airframe, just might get the job done, as a First Stage Booster.
I hope that "Wan Hu" ( your "Head Mentor" ) is teaching you well . . . Soon, the "big fire will erupt from the mouth of the Dragon" !
( Hmm . . . I must be "channeling" Bruce Lee . . . LOL ! )
Dave F.
I have a spare 40ft parachute in black and white if you’d like. I know those military Parachutes have a crazy amount of lines.
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Chuck,
There is a 90g CO2 cartridge that will probably suffice for you in terms of CO2 amount if you minimize empty volume as Jim suggests. There is a guy who made a very nice motor-based release mechanism for a pre-charged CO2 ejection cannon. I didn't like having to figure out the loads on the motor shaft, instead I came up with a motor-driven shuttle valve using a headlight leveling motor, so all I needed to 'invent' was an o-ring seal. There are 90g to paintball adapters allowing one to have a valve on it [and a gauge] quite reasonably. The shuttle valve could also be squib driven if one just has to burn something.
br/
Tony
Rail Dawg
Always learning!!!
Hey thanks Buddy. Your 50’ chute would do the trick. Although the 35’ chute we were given is nice it’s just not big enough.
Can you tell me the cd again for your 50 footer?
Thanks!
Chuck C
Rail Dawg
Always learning!!!
Thanks Tony for the info. Once we get some time we’ll test the G-12 cannons to see how they work.
If there are any concerns we’ll start looking at the CO2.
Again good info.
Chuck C.
The CD on all of our Chutes is .98-.99. I’m guessing it’d bring your rocket down around 11-13fps which is plenty soft. I am not worried at all about the Standard version being strong enough. As you can see in this video how fast those 3 Chutes opened up with all that weight, it’s truly amazing how strong they are.
Rail Dawg
Always learning!!!
Thanks for that Buddy. Will be in touch.
Chuck C.
Chuck C.
Chuck,
Didn't you say, previously, that the Rocketman 50 ft parachute was only as efficient as a 40 ft conventional parachute ?
Dave F.
The round Chutes actually have a lower Cd than our Parabolic Chutes because of the cups that hold the air in. So our 50ft chuge is probably compared to a 53ft conventional Chute.
Buddy,
Interesting, since your parachute resembles an X-Form chute, in many ways.
Dave F.
I would have to disagree as x form Chutes are flat, that’s why their drag is so low, along with top flights Chutes. Also x form Chutes have 8 lines not 4. My Chutes are no where near flat.
Andrew_ASC
UTC SEDS 2017 3rd/ SEDS 2018 1st
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Thanks for the actual drag coefficient value of your chutes buddy. I wish that detail was on your website. Makes it easier to design stuff with numbers.
Buddy,
I said there were similarities, compared to a conventional chute, not that yours is an X-Form chute.
Dave F.
Chuck,
For future reference, you might want to check out the "S" Motor project here . . .
https://rocketsmagazine.com/wp-content/uploads/2018/08/ROCKETSMagazine0035.pdf
Dave F.
For future reference, you might want to check out the "S" Motor project here . . .
https://rocketsmagazine.com/wp-content/uploads/2018/08/ROCKETSMagazine0035.pdf
Dave F.
Rail Dawg
Always learning!!!
I didn't know this Buddy.
It's good information to know.
That fact there's only 4 shroud lines makes a big difference too.
Chuck C.
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Dave F,
Thanks for that link, a very good write-up showing the right way to develop a large motor.
br/
Tony
Thanks for that link, a very good write-up showing the right way to develop a large motor.
br/
Tony
Rail Dawg
Always learning!!!
Got 2 30+ lb propellant grains made. 13 more to go lol!
5 grains per motor. 2 Q’s and an R. One of the Q’s is for testing.
Chuck C.
5 grains per motor. 2 Q’s and an R. One of the Q’s is for testing.
Chuck C.
TandemDwarf3410
Member
My exact reaction
MClark
Well-Known Member
I know that mixer.
I was leaning on it two weeks ago.
Did you get enough rain yesterday ?
M
Rail Dawg
Always learning!!!
Heard it poured (pun intended).
Also heard you brought in some wonderful backstrap!
Chuck C.
Rail Dawg
Always learning!!!
Next step on the build is the electronics bay.
24” long G-12 coupler with stringers. Along 2 of the stringers are going to be aluminum u-channel. Into those u-channels will slide the Delrin plate that holds the 3 altimeters and GPS tracker.
One end of the coupler will have a 3/4” birch centering ring along with a removable aluminum bulkplate for access. The other end will have a birch and aluminum bulkplate.
Attached to each bulkplate will be the ejection cannons. The goal is to have the BP gasses completely isolated from the electronics. Using terminal posts that go through the bulkplates will allow the e-matches to not have to pass into the electronics bay.
I’m getting excited that it’s all slowly coming together. The rocket is definitely starting to get heavy lol.
Chuck C.
24” long G-12 coupler with stringers. Along 2 of the stringers are going to be aluminum u-channel. Into those u-channels will slide the Delrin plate that holds the 3 altimeters and GPS tracker.
One end of the coupler will have a 3/4” birch centering ring along with a removable aluminum bulkplate for access. The other end will have a birch and aluminum bulkplate.
Attached to each bulkplate will be the ejection cannons. The goal is to have the BP gasses completely isolated from the electronics. Using terminal posts that go through the bulkplates will allow the e-matches to not have to pass into the electronics bay.
I’m getting excited that it’s all slowly coming together. The rocket is definitely starting to get heavy lol.
Chuck C.
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