An "R"-powered rocket build

jderimig said:

I heard ~140grams on his last flight. He doesn't mess around.

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The 4th of July is coming a little early this year . . . B-O-O-M . . . LOL !

140 grams of BP is just under 5 oz. . . . This video uses 4oz ( 113.4 gr ), for comparison :



Dave F.

dwightr said:

Will drogue charges need to be heavier because of low outside pressure? I was thinking that differential pressure was really the goal and outside pressure is really indifferent.

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You’re right.

to get out a 28 foot chute at 5k feet I used 1 oz

Fill the charge cannon with Coffee-Mate powder for visual feedback.

awe are not to have incendiary devices or so I thought

jbr said:

awe are not to have incendiary devices or so I thought

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You’re right:
NFPA 1127:
4.11 Payloads.
4.11.1* A high power rocket shall not carry a flammable or
explosive payload.

But what he’s suggesting (a cremora bomb) probably wouldn’t work well at high altitudes anyway. Cremora bombs function by being dispersed in the atmosphere but but able to have combustion spread. It requires both air density and atmospheric oxygen.
The thing is we try to distinguish between Rocketry and fireworks. Doing something that blurs that line is frowned upon.

It looks like the sarcastic wink eye emoji is not effective on this forum.

numbo said:

It looks like the sarcastic wink eye emoji is not effective on this forum.

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Sorry, I missed that. [emoji58]

I don't know if you are still looking for a nose cone but I have this one. It's 13" in diameter and made of 2mm thick aluminum except for the round tip which is fiberglass. I'm flying the rocket it is on for the last time next week and then looking for a home for either the parts or the rocket itself. Located in Southern Calif.

Spacemo said:

I don't know if you are still looking for a nose cone but I have this one. It's 13" in diameter and made of 2mm thick aluminum except for the round tip which is fiberglass. I'm flying the rocket it is on for the last time next week and then looking for a home for either the parts or the rocket itself. Located in Southern Calif.

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Hey I appreciate your reaching out!

The airframe ID for this rocket is 11.38" so your nosecone would be a little too big.

That's too bad... it looks like a nice one!

Thanks though.

Chuck C.

Just a thought...you can cut the length back until it is the right diameter. I cut about an 1 1/2" off to bring it down to what I needed.

Spacemo said:

I don't know if you are still looking for a nose cone but I have this one. It's 13" in diameter and made of 2mm thick aluminum except for the round tip which is fiberglass. I'm flying the rocket it is on for the last time next week and then looking for a home for either the parts or the rocket itself. Located in Southern Calif.

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No not Nibbles !! I wish I could take care of it for you .

Must have missed something along the way, but are you actually this far into this without having a solid nose cone plan?

"Must have missed something along the way, but are you actually this far into this without having a solid nose cone plan?"

Frankly - there doesn't seem to be a plan - just build as big as you can as you go.....good entertainment, but..........

FredA said:

"Must have missed something along the way, but are you actually this far into this without having a solid nose cone plan?"

Frankly - there doesn't seem to be a plan - just build as big as you can as you go.....good entertainment, but..........

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Yup, followed for a while and eventually lost interest. Just check in occasionally.

Wallace said:

Must have missed something along the way, but are you actually this far into this without having a solid nose cone plan?

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Good question.

Got a fiberglassed nosecone from Curtis Turner a few months ago. We are beefing up the inside to make it even stronger but it should work quite well.

The pics were posted and there were a few lengthy discussions but I'll admit they are probably buried in the thread lol.

Thanks!

Chuck C.

FredA said:

"Must have missed something along the way, but are you actually this far into this without having a solid nose cone plan?"

Frankly - there doesn't seem to be a plan - just build as big as you can as you go.....good entertainment, but..........

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With the Engineering Dept's help about 6 months ago we started to nail down the design. There have been a few design changes since then but overall the rocket is following that plan (I think) quite well.

The forum has done an outstanding job providing input to this build.

If it's not clear that this is a good, solid rocket being built as designed then that's my fault.

And yes it is entertaining! I've been having a blast building this thing. Some say it's not easy building with all eyes watching but for me it's a great experience.

Take care.

Chuck C.

Spacemo said:

Just a thought...you can cut the length back until it is the right diameter. I cut about an 1 1/2" off to bring it down to what I needed.

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Looks like a great nosecone... I'll bet it finds a good home.

Going to stick with what we have... it should work well.

Appreciate it though!

Chuck C.

Rail Dawg said:

Good question.

Got a fiberglassed nosecone from Curtis Turner a few months ago. We are beefing up the inside to make it even stronger but it should work quite well.

The pics were posted and there were a few lengthy discussions but I'll admit they are probably buried in the thread lol.

Thanks!

Chuck C.

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So, fiberglassed as in hand laid? And now you're contemplating a filament wound?

Wallace said:

So, fiberglassed as in hand laid? And now you're contemplating a filament wound?

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Yes hand-laid fiberglass with a reinforced interior.

Should work quite well. If we can get a filament-wound nosecone we'll go with that simply because it would match the strength of the rest of the rocket. Wouldn't have to spend the time to work on the hand-laid nosecone.

Still have 3 months to build and the rocket is coming along nicely. Again if the impression has been given that this is a haphazard build then I take the blame for that.

Probably should post more build pics lol. Today is working on the AvBay getting the switches in place. It's almost complete except for the testing and mounting of the charge cannons.

I'll post pics a little later on.

Thanks!

Chuck C.

Here's a pic of the hand-laid nosecone received awhile ago. Need to reinforce the tip and the interior but besides that it's definitely up for the task.

Chuck C.

I have a 12" V2 nose and rear cone I need to add more carbon to, I have too many projects
currently working on a 6" L3 project, gotta get that done for LDRS, then I can play with my bigger motors and rockets

Rail Dawg said:

Here's a pic of the hand-laid nosecone received awhile ago. Need to reinforce the tip and the interior but besides that it's definitely up for the task.

Chuck C.

View attachment 384785

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I see no reason in replacing that unless you're not happy with the profile? As long as the shoulder and o.d. are correct you can easily beef 'er up at will interiorly.

And, yes..Interiorly is a word that turns spell check instantly into Bitching Betty..

Wallace said:

I see no reason in replacing that unless you're not happy with the profile? As long as the shoulder and o.d. are correct you can easily beef 'er up at will interiorly.

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Hey that's a good word. I like it.

And you're right there's nothing wrong with the current nosecone. There's just so much work involved in the build trying to lighten the load when able lol.

Curtis at Pro-Line makes the best filament-wound rocket parts in the business. For those that have seen his raw work you know what I mean.

Chuck C.

Gotcha. Just think before Ya leap.

First pic is the Avionics Bay sled where the electronics will be mounted. It's a Delrin board that slides into aluminum channels. The fit is just about perfect... that board isn't going anywhere.

The second pic shows what it looks like after the 1/4" aluminum mounting plate is installed and the 1/2" forged-steel all-thread and eyenuts are installed for flight.

The third pic is what the Engineering Dept gave me to work from. There was another pic of the eyenuts but it doesn't want to post.

The all-thread and eyenuts can together handle 7200 lbs of force which equals what the 3/4" forged-steel eyebolt in the upper enclosure of the motor is designed to handle.

The aluminum plates will rest on a total of (8) 3/4" birch stringers and almost 1" of birch couplers on each end.

A very robust system designed by the Engineering Dept. Recovery forces are being accounted for in the event the rocket is moving faster than expected at apogee. Sure wish we could plan on a tail-slide at apogee... wouldn't that be nice lol?

Chuck C.

Is that delrin plate stabilized in a single plane with multiple "joints"?

Wallace said:

Is that delrin plate stabilized in a single plane with multiple "joints"?

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Not sure I get the question?

I'm kind of slow lol.

Chuck C.

Do you have more pics from differing angles? Bit difficult to tell what I'm seeing..