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Plunkey Mark IX

mrplunkey

mrplunkey

New member
Bonding of fins. Epoxy filler to be added tomorrow evening.

auz6ua.jpg
 
WoodyO said:
Needs some depleted uranium in the tip
Click to expand...

True.

The latest model is much smaller than the Mark VIII though. I'm going through a miniaturization phase.

If I can successfully miniaturize my standard (75mm) engine into three stages (5.5 inches, 5.5 inches, 3 inches), I should be able to put something into space.

Real talk.
 
Plunkey... Is that a self taught hobby? I wouldn't have a clue where to start!
 
Pick. ... Pics??? This appears to be a pics thread
 
-SD- said:
All your technology and you cant post proper sized pics
Click to expand...

Ain't that the damn truth?

I feel like the NASA guys who lost a Mars probe because half of it was designed in Standard units and the other half in Metric.

FML.
 
Cant wait for the ICBM class Mark XXVIII that will be sold to Iran for big money
 
-SD- said:
Cant wait for the ICBM class Mark XXVIII that will be sold to Iran for big money
Click to expand...

That's pretty much my retirement plan.

I wanted to see if you could build a cruise missile in your basement from ordinary Internet-available parts.

And yes, it is true.

My range sucks though. I need to work on that. I don't think I can get where I want to go on liquid nitrous oxide alone. Originally I used solid fuel (PBAN/Ammonium Percholorate) but that shit blows up on you waaaaaaaaaay too often.
 
This is why solid fuel engines are hard to scale up. The one in this video is only 75mm x 4". The containment tube it's in is a very thick-walled stainless steel (I don't remember the exact wall size). Look at what it did to the tube:

View My Video
 
Mr Plunkey Jr (the 4-year old) is launching the next one. He's gonna be a mega-nerd.
 
mrplunkey said:
I'm shooting for a week from this weekend, but there are a lot of unknowns.

Here's the last one, fired weekend before last. It's a 5.5" diameter frame at over 12 feet tall.
Click to expand...

Oh wow! is it in your garage now or out happily orbiting? Doesn't seem to be carrying enough fuel to get it very high, but I know nothing.lol
 
*ebony* said:
Oh wow! is it in your garage now or out happily orbiting? Doesn't seem to be carrying enough fuel to get it very high, but I know nothing.lol
Click to expand...

No, that was a very fast-burning engine.

I need to learn how to regulate the flow of nitrous oxide better (I know a race car guru who is helping me). Full-on flow is great for leaving the launch pad, but soon thereafter I spend most of my energy fighting wind friction. And then I need to figure-out how to convert from nitrous to liquid oxygen. But that stuff can really blow-up.

Finally, I've got to figure-out how to get stages to reliably separate. It's much harder than just blowing-out a parachute.

After that, I'm leaving something in space.
 
mrplunkey said:
No, that was a very fast-burning engine.

I need to learn how to regulate the flow of nitrous oxide better (I know a race car guru who is helping me). Full-on flow is great for leaving the launch pad, but soon thereafter I spend most of my energy fighting wind friction. And then I need to figure-out how to convert from nitrous to liquid oxygen. But that stuff can really blow-up.

Finally, I've got to figure-out how to get stages to reliably separate. It's much harder than just blowing-out a parachute.

After that, I'm leaving something in space.
Click to expand...

and mount a camera
 
mrplunkey said:
No, that was a very fast-burning engine.

I need to learn how to regulate the flow of nitrous oxide better (I know a race car guru who is helping me). Full-on flow is great for leaving the launch pad, but soon thereafter I spend most of my energy fighting wind friction. And then I need to figure-out how to convert from nitrous to liquid oxygen. But that stuff can really blow-up.

Finally, I've got to figure-out how to get stages to reliably separate. It's much harder than just blowing-out a parachute.

After that, I'm leaving something in space.
Click to expand...

More space debris! j/k

Will you have some way to access your object in space? will you be controlling it in anyway? This sounds really cool, a device to take images or video even without remote control would be really cool to have up there.
 
mrplunkey said:
No, that was a very fast-burning engine.

I need to learn how to regulate the flow of nitrous oxide better (I know a race car guru who is helping me). Full-on flow is great for leaving the launch pad, but soon thereafter I spend most of my energy fighting wind friction. And then I need to figure-out how to convert from nitrous to liquid oxygen. But that stuff can really blow-up.

Finally, I've got to figure-out how to get stages to reliably separate. It's much harder than just blowing-out a parachute.

After that, I'm leaving something in space.
Click to expand...

moar diameter!

moar thrust!


no homo, though!
 
We are currently under a tornado watch..I might also have something up in space!
 
My telemetry only works over a 10-mile length. I'd have to redo that subsystem before I could send anything back.
 
mrplunkey said:
This is why solid fuel engines are hard to scale up. The one in this video is only 75mm x 4". The containment tube it's in is a very thick-walled stainless steel (I don't remember the exact wall size). Look at what it did to the tube:

View My Video
Click to expand...

Wall thickness goes at the window at around 3,000 degrees and after working in an aluminum foundry and heating steel molds super hot for the die casting machines, I would say that was really hot.
 
goin on 4T said:
Wall thickness goes at the window at around 3,000 degrees and after working in an aluminum foundry and heating steel molds super hot for the die casting machines, I would say that was really hot.
Click to expand...

I believe it.

Ammonium perchlorate has this nasty property where the more you compress it, the more it wants to explode. Even a small nozzle obstruction leads to a huge explosion.
 
awesome carbon fiber layup. You go with that for the ultimate stiffness to weight ratio? What kind of epoxy are you using to bond them.

Your fin guides are printed out of plastic? Are these for a test fit or are you actually going to be using them? I'd use that fillet tool and add a generous radius to every right angle (where applicable) on those guides to avoid stress concentrations.
 
UA_Iron said:
awesome carbon fiber layup. You go with that for the ultimate stiffness to weight ratio? What kind of epoxy are you using to bond them.

Your fin guides are printed out of plastic? Are these for a test fit or are you actually going to be using them? I'd use that fillet tool and add a generous radius to every right angle (where applicable) on those guides to avoid stress concentrations.
Click to expand...

The carbon fiber has a lot of benefits. It's rigid and dead-flat, even if you cut/machine it. It won't stress relieve after machining. It also keeps the ass-end of the rocket lighter which means a higher center of mass. That means less weights needed in the nose -> lighter overall weight -> smaller parachute -- it's a virtuous cycle.

I only use the 3D printed fin guides for initial fin placement (then I slide them off). They let me get enough steel-reinforced epoxy putty in place to hold them for good.

By the way... if I sent your a solidworks, could you do a wind tunnel simulation test?
 
Electronics bay for Mark IX is 100% 3D-printed:

2h6wowy.jpg


Here is the epoxy bonding of the fins onto the phenolic airframe:

24w6of7.jpg


And here are the launch rail buttons attached to 3D printed lugs:

kei7ic.jpg
 
mrplunkey said:
Electronics bay for Mark IX is 100% 3D-printed:

2h6wowy.jpg


Here is the epoxy bonding of the fins onto the phenolic airframe:

24w6of7.jpg


And here are the launch rail buttons attached to 3D printed lugs:

kei7ic.jpg
Click to expand...


put your cawk in sum of those pics

you know ... for scale



no homo, though!
 
Better put your cawk next to a tall boy of coors first, so we can get an accurate measurement (unless you have a CMM handy).
 
Got the circuit boards back today. Soldered them up and got the main computer running in ~10 mins.

33ehmpv.jpg


Finished bonding the lower launch buttons onto the frame as well:

msli14.jpg
 
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