An "R"-powered rocket build

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Andrew_ASC said:
I can only predict how hot that nosecone ultimately gets. The curves on a nosecone require finite analysis thermally with a Solidworks package I no longer have access to post graduation. The length of aluminum tip it is unknown because it’s not hand solvable that I know of but I would reckon a few inches of solid aluminum would be fine. Aluminum makes a great heat sink, forget the steel you won’t need it. Steel anything non recovery hardware related will make launch approval harder. Sorry to be the downer. Wish I could help more.
Click to expand...

Does this finite analysis come on the 2018-2019 student edition of solidworks?
 
Taking the nosecone in today to get the aluminum tip built. As stated before the tip will have all-thread so it can be bolted to a lower plate.

I'm thinking 3-4" in length should be plenty.

Chuck C.
 
noah_carter13 said:
Does this finite analysis come on the 2018-2019 student edition of solidworks?
Click to expand...

I don’t believe so. The university had some nice addons and had an “educational” full feature version which was unlocked as if it was a commercial license with the excuse of it was to be used for academic uses only. Many students complained the student version hardly did much to be honest. I never personally tried the student version.
 
Andrew_ASC said:
I don’t believe so. The university had some nice addons and had an “educational” full feature version which was unlocked as if it was a commercial license with the excuse of it was to be used for academic uses only. Many students complained the student version hardly did much to be honest. I never personally tried the student version.
Click to expand...

Okay, thanks!
 
Rail Dawg said:
Taking the nosecone in today to get the aluminum tip built. As stated before the tip will have all-thread so it can be bolted to a lower plate.

I'm thinking 3-4" in length should be plenty.

Chuck C.
Click to expand...

I think that will be good. The R powered rocket I designed in high school had a 9.6” steel tip (needed the weight for stability, was in a time crunch) we also looked at manufactured nose cones from various companies and measured their length ratios (tip : full length of nose cone) and took a rough average. Our nose cone was 7.74” OD, and 38.7” long (5:1 Von Karman) (went through mach 2.2)
 
Andrew_ASC said:
I don’t believe so. The university had some nice addons and had an “educational” full feature version which was unlocked as if it was a commercial license with the excuse of it was to be used for academic uses only. Many students complained the student version hardly did much to be honest. I never personally tried the student version.
Click to expand...

Andrew,

What about the 2016 "Premium" Edition ?

Dave F.



hurler-4.jpg
 
TO ALL,

If you have an "issue" with the size of my "Hurler" image, on this thread, please "grow a pair" and say something on the open forum, rather than "whining" to the Mods !

Here is the new "reduced" size . . .

Dave F.

hurler-4 - REDUCED.jpg
 
Started work today on the Avionics Bay. I'll post pics once I get a little further along.

It's going to have an aluminum u-channel on each side that the 6" x 12" Delrin plate for the electronics will slide into.

The Bay is designed to be removed completely from the rocket for prepping. There's a permanent 1 1/2" switch band that is the same OD as the airframe and will be epoxied right in the middle of the AvBay. It's purpose is to house the access holes for the arming of the electronics.

Again will post pics soon.

Chuck C.
 
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Rail Dawg said:
Started work today on the Avionics Bay. I'll post pics once I get a little further along.

It's going to have an aluminum u-channel on each side that the 6" x 12" Delrin plate for the electronics to slide into.

The Bay is designed to be removed completely from the rocket for prepping. There's a permanent 1 1/2" switch band that is the same OD as the airframe and will be epoxied right in the middle of the AvBay. It's purpose is to house the access holes for the arming of the electronics.

Again will post pics soon.

Chuck C.
Click to expand...

Chuck,

Looking forward to pics . . .

Dave F.

hurler-5.jpg
 
What kind of switches are you thinking about? Given the anticipated performance I am thinking this is one area where you don’t need to go nutso.
 
Theory said:
What kind of switches are you thinking about? Given the anticipated performance I am thinking this is one area where you don’t need to go nutso.
Click to expand...

Good question.

The switches are from SMT Design. You screw in the bolt from outside the rocket and it locks the spring switch into the "on" position.

Nothing is fool-proof of course but this is a very robust way to keep a switch on.

Chuck C.

0002301_bay-switch-kit_1050.jpeg
 
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Loaded the "Q" is about 245 lbs and the "R" is about 285 lbs.

The casing weighs about 100 lbs.

Chuck C.
 
Lukun7 said:
Man, 385 pounds! Thats one big motor! What thrust are you hoping it will have?
Click to expand...

The "Q" starts out at 3100 lbs of thrust and ramps up for 9 seconds to 4100 lbs of thrust.

Still working the "R" numbers but should have those available shortly.

Chuck C.
 
Rail Dawg said:
Good question.

The switches are from SMT Design. You screw in the bolt from outside the rocket and it locks the spring switch into the "on" position.

Nothing is fool-proof of course but this is a very robust way to keep a switch on.

Chuck C.
Click to expand...

Chuck,

I really like the "concept" of that Switch Lock . . .

A "word of caution" - You are still "at the mercy" of that cheap, little Chinese slide-switch,however !

Dave F.


hurler-5.jpg
 
Ez2cDave said:
Chuck,

I really like the "concept" of that Switch Lock . . .

A "word of caution" - You are still "at the mercy" of that cheap, little Chinese slide-switch,however !

Dave F.
Click to expand...


Which is why of course we will be using 3 of them for full redundancy and then some.

Thanks!

Chuck C.
 
Ez2cDave said:
Chuck,

Remember that each additional component introduces a potential "failure mode" . . . Be careful !

Got your back . . .

Dave F.
Click to expand...

Thanks. As we all know it's a fine line to walk when engineering a rocket that's for sure.

Part of the reason we may just go with 2 Marsa altimeters and not install the back-up PerfectFlite StratoLoggerCF altimeter.

Great to have back-ups but too many and there's a better chance of one altimeter deciding to misbehave.

Chuck C.
 
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Working on the Avionics Bay. In the pic are the aluminum u-channels on the stringers for the Delrin board that houses the altimeters and GPS tracker.

Also pictured are the SMT Designs on/off switches also mounted on stringers. The spring switch is placed "upside-down" in the slot with the wire terminals facing up. The screw is inserted and causes the spring switch to open.

It's a very secure way to turn the electronics on and off.

Chuck C.IMG_4957[1].JPG
 
Last edited:
The screws are the exact right length to securely activate the switch from outside of the rocket.

Chuck C.
 
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