spudgun range, are we falling short?

[POLAND_SPUD]

above 35mm is uncomfortable to machine on a small lathe

omg why use a lathe?? just use pvc/copper pipe, nose cone plus fins

[Petitlu]

Ok
So the 30 or 33 mm inside
33mm best ..

[jackssmirkingrevenge]

omg why use a lathe?? just use pvc/copper pipe, nose cone plus fins

The idea is to use existing pipe for the body and machine the nose cone and fins, the latter would be sort of... on a lathe

[POLAND_SPUD]

lol ramjet ammo - check the last two pages
http://www.dtic.mil/ndia/2004armaments/ ... n_COOP.pdf

[jackssmirkingrevenge]

lol ramjet ammo

Comparing that to the Oto Melara Vulcano round actually ties in nicely with the scope of this thread.



[youtube][/youtube]

It avoids the weight and complexity of having on-board propulsion such as rocket assisted rounds or the ramjet rounds you linked to, but still achieves tremendous range - 70km in a ballistic trajectory. By adding guidance that would allow the projectile to glide, this would extend it even further.

The Nazis were w-a-a-a-a-a-ay ahead of their time:

[POLAND_SPUD]

2:00 - 2:12 -> I think they explain what I meantioned earlier as far as gliding ammo is concerned - it needs some sort of guidance

damn you JSR I though I found something interesting and then you post this

though I am pretty sure you find it even more fap worthy than I do
lol at first I wrote 'more fap worthy than me' but then I realised what would you do with that

[dewey-1]

I think they explain what I meantioned earlier as far as gliding ammo is concerned
damn you JSR I though I found something interesting and then you post this

And you criticize my spelling!
Got you! Fat fingers or Vodka?

[al-xg]

As a bit of a tangent from the reccord setting ranges, something like this would be pretty amazing fired from some sort of canon
[youtube][/youtube]

Of course larger bore, lower velocity and lower acceleration on launch would be requisites. You'd probably have to start off very slow, a lot could go wrong.

Anyone got some FPV gear ?

[jackssmirkingrevenge]

2:00 - 2:12 -> I think they explain what I meantioned earlier as far as gliding ammo is concerned - it needs some sort of guidance

I'm quite sure that a properly trimmed projectile will glide without the need for guidance. The problem is that once you introduce lift dependent flight, the projectile becomes much more susceptible to environmental factors like wind and air pressure, so realistic accuracy is not achievable without guidance.

And you criticize my spelling!

He has the "but I'm not a native speaker! *hic*" defence

As a bit of a tangent from the reccord setting ranges, something like this would be pretty amazing fired from some sort of cannon

Awesome but it seems like a waste of RC gear for such a short flight.

[POLAND_SPUD]

He has the "but I'm not a native speaker! *hic*" defence

Hey I am a Pole but I haven't drunk anything (yet)

Awesome Very Happy but it seems like a waste of RC gear for such a short flight.

Sure but if you think of it you might as well put two servos on a projectile

[jackssmirkingrevenge]

Lookie what arrived from down under

Pretty compact... my only concern is the coil, apparently it cannot be potted.

Dewey, help? I've never really put a circuit together before, any basic advice?

[dewey-1]

Where to start?

Assuming you have a soldering iron of 25 to 50 Watt and the correct rosin core electronic solder (60-40 or 63-37) of about 1mm diameter then please start reading these links.

First: http://www.mil.ufl.edu/5666/6270/6.270B ... npter3.pdf

Second: http://www.1728.org/resisclr.htm

I recommend doing the coil as the last item to solder.
Build it to what the instruction sheet shows.

Post close up pictures of resistors or other components if you have problems with them.

Here is some more information based on parts list.

http://talkingelectronics.com/projects/ ... acker.html

PARTS LIST
1 - 220R (Red, Red, Brown, Gold)
1 - 330R (Orange, Orange, Brown, Gold)
2 - 1k (Brown, Black, Red. Gold)
1 - 47k (Yellow, Violet, Orange, Gold)
1 - 220k (Red, Red, Yellow, Gold)
1 - 5p6 ceramic
1 - 10p ceramic
1 - 39p ceramic
1 - 1n ceramic
1 - 22n ceramic
1 - 10u 16v PC mount electrolytic (Note Polarity!)
1 - 22u 16v PC mount electrolytic (Note Polarity!)
2 - BC 547 transistors (Note Polarity!)
1 - BC 557 transistor (Note Polarity!)
1 - 5 turn, 3mm dia enamelled wire (Put in last!)

[jackssmirkingrevenge]

Cheers!

Especially for translating the colour coding on the resistors...

Silly question, should I strip off the enamel at the point where I solder the coil?

[dewey-1]

Definitely yes.

The color code was easy to remember even when I learned it as teenager.
You should easily remember this too.
It was used by the US miltary Electronic instructors during WWII.

Bad-------Black
Boys------Brown
Rap#-----Red
Our-------Orange
Young----Yellow
Girls------Green
But-------Blue
Violet----Violet
Gives-----Grey
Willingly-White

[Petitlu]

it is even more complicated for me!