Build Thread - MoonShot III Heavy

[PayLoad]

Is it just me, or does there seem to be a dearth of fins on this bird?

I'm a CG/CP guy, using minimal fins possible. I'd have no fins if I could get away with it. 115 grams of lead in nose.

 

[mo2872]

I know, no comparison, really, but 115 grams made me chuckle.......this is the heaviest of my slugs for the nose of my Phoenix........ (Sorry, it’s sideways....)

 

[PayLoad]

Dang - Makes me want to just throw it in a (strong) vice & Light 'er up. I90 - 640 nS

 

[PayLoad]

I90 Ready for test fire

 

[Long_Gone]

Fins look small.................................
My .02
LG~

 

[PayLoad]

First-try success, which is rare for me...

 

[rocketgeek101]

First-try success, which is rare for me...

View attachment 435386

Wow... 7.5 sec of thrust... That should be a really cool flight. Please post video

 

[Long_Gone]

Yea right

 

[PayLoad]

Thus endith this build thread & TRF for a while

 

[jqavins]

Hey Long_Gone, did you mean something by that last comment that was not as sarcastic and insulting as it looks?

PayLoad, that looks like somewhere in the ballpark of a 675J90. What total impulse did you compute from the gathered data?

Is the rise time what you intended? I'm talking out my butt, but it looks quite long to me.

 

[Long_Gone]

I was agreeing......lots lost in texts anymore.

 

[PayLoad]

I HAD to post a "Thank You" to Rocketgeek101, who printed my motor extensions, they worked perfectly, THANKS

 

[MClark]

"IKEA" Booster mount/release hardware.........

View attachment 433546

Are these parts made from steel?
That would be a no go at a NAR or TRA launch

 

[PayLoad]

Are these parts made from steel?
That would be a no go at a NAR or TRA launch

Dad?

Yeah, pretty much my entire experience on this build thread has been how "you can't do that" and "that's not right" and has been pretty damn discouraging.

Michael

 

[MClark]

Dad?

Yeah, pretty much entire experience here is how "you can't do that" and "that's not right" pretty damn discouraging. But the "Post a pic that makes you laugh" is still pretty good.

Michael

The safety rules were put in place for a reason. They are all posted on the NAR and TRA websites.
We have told our insurance companies and the government agencies that we will follow those safety rules.

 

[PayLoad]

The safety rules were put in place for a reason. They are all posted on the NAR and TRA websites.
We have told our insurance companies and the government agencies that we will follow those safety rules.

I agree with you 100%

 

[ether]

Here is the guidance on ductile metal

Seems like the design would fit the rules, it's for integrity of the rocket and is only as much as needed. At the end it's between a discussion/agreement between the builder and the RSO


https://www.tripoli.org/Portals/1/D...Metal%20in%20Rocket%20Construction%20v2.0.pdf
Nice design, love to see the 1st test article

 

[Tobor]

Hey Payload,
Wish I was in your neck of the woods. I'd love to see this bird fly!
Btw, thx for sharing your ideas/techniques of this build. I really dig "Outside the Box" solutions.

Best wishes and plz post pics of the launch.

 

[MClark]

Here is the guidance on ductile metal

Seems like the design would fit the rules, it's for integrity of the rocket and is only as much as needed. At the end it's between a discussion/agreement between the builder and the RSO


https://www.tripoli.org/Portals/1/D...Metal%20in%20Rocket%20Construction%20v2.0.pdf
Nice design, love to see the 1st test article

Last part of metal in rockets


Revision: June 2015
The set of metals that shall meet the “ductile metal” constraint is limited to:
- Aluminum alloys
- Copper Alloys

 

[ether]

good point - the NAR code does not specify the metals that meet ductile - guess one could use the scientific definition of ductile metal in that instance - glad PayLoad abides by the safety rules - never seen any stainless eyebolts in his rockets

 

[jqavins]

Is the rise time what you intended? I'm talking out my butt, but it looks quite long to me.

I certainly never meant to be discouraging. I this comment was, I apologize.

The set of metals that shall meet the “ductile metal” constraint is limited to:
- Aluminum alloys
- Copper Alloys

Aw, c'mon. Pure copper is more ductile than most of it's alloys. Silver is more ductile yet, and nothing is more ductile than gold.

 

[PayLoad]

Added a fin to each fall-off booster - makers me feel better -

 

[Long_Gone]

You need to make a video of the flight, I need to see this.

 

[PayLoad]

You need to make a video of the flight, I need to see this.

You can count on it - two cameras on ground, two on board

 

[Nytrunner]

Added a fin to each fall-off booster - makers me feel better -

That does look better. I could see the core fins getting shadowed by the outboard tubes and being less effective than OR would calculate

 

[3stoogesrocketry]

Was that your video on YouTube. Mantis launch pad / red rocket ?

 

[PayLoad]

No need to re-invent the wheel. I scrapped all plans for "ikea" hardware for releasing boosters, instead relying on a simple ejection-release of boosters. Nosecone holds booster in place, ejection removes nosecone & releases booster.

 

[Antares JS]

I'm familiar with those Apogee strap-on booster hooks and while they are great, I have to question whether they will hold up in a high-power flight... Especially when the boosters are going to be hauling the whole rocket into the air without the central motor helping. I could be wrong but it's something you might want to consider/test.

Definitely make sure though that you inspect the hooks and check the fit of your boosters before every flight. The hooks warp very easily. I've already had to take a lighter to mine to soften them and form them back into shape after a booster got stuck on a bent hook.

 

[Blast it Tom!]

Aw, c'mon. Pure copper is more ductile than most of it's alloys. Silver is more ductile yet, and nothing is more ductile than gold.

Very true. Annealed copper is almost like metal taffy. Never pulled silver or gold. No, I am not Sam the Snowman

 

[Scott_650]

PayLoad - do you have a wag on the apogee this beast is going to hit? And am I reading that thrust curve graph right - over 7 seconds of burn? I’d say this rocket is going to put on quite a show!