OK to talk motors, just not formula's.
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 neighborhoodOh 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.
OK to talk motors, just not formula's.
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.
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’ve also considered a paintball-sized CO2 bottle with an explosive squib. I’ve never made one of these so would have to learn.
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.
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
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
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
Chuck,
Didn't you say, previously, that the Rocketman 50 ft parachute was only as efficient as a 40 ft conventional parachute ?
Dave F.
View attachment 379948
Buddy,
Interesting, since your parachute resembles an X-Form chute, in many ways.
Dave F.
View attachment 379956
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.
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.
My exact reactionGOOD GOOGLY MOOGLY
(subscribes to thread)
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. View attachment 380041
I know that mixer.
I was leaning on it two weeks ago.
Did you get enough rain yesterday ?
M
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