Trebuchet range?

paaiyan · Thu Dec 20, 2007 11:59 pm

DYI wrote:I think he meant 3kg...

I know what he meant. I can still make fun of him.

Tom Hogan · Mon Dec 24, 2007 3:43 pm

Yea, it was 3kg, not 3km. I wish it was 3km.

Bubba05 · Tue Dec 25, 2007 12:14 pm

I watched a doco on the history channel reasenty.
A couple of blokes from merry ole england went out and reproduced a period trubuchet. now they didnt get into detail about specs but the thing had to be transported by being towed behind a land rover and was sizable enough to launch 200 pound bolders over 2000 feet. this thing was made of timber and was nailed together using period building materials. So far yours is made of steel rite?
Mate you should not have a dramer with the thing breaking anytime soon.
There used for sege warfar and they could never get the things to hit dead on target every time. they was just used to smash up walls on castels.
So realy there only be one way to find out how she goes and thats to go and invade france and take down some fortress walls!!
Good luck with the campane and i hope you get to sack a duke!!

Bubba

jimmy101 · Tue Dec 25, 2007 1:34 pm

Bubba05 wrote:I watched a doco on the history channel reasenty.
A couple of blokes from merry ole england went out and reproduced a period trubuchet. now they didnt get into detail about specs but the thing had to be transported by being towed behind a land rover and was sizable enough to launch 200 pound bolders over 2000 feet.

2000 feet sounds way too far for a large treb.

There is an excellent Nova on trebs, definitely worth a trip to your local library to check out a copy if you are planning to build a large treb.

Their take was that the largest treb's ever built, and actually used for laying siege, could throw stones weighing several hundred pounds to a range of a few hundred yards. It appears that the treb's crew would always be within range of long-bows from the castle under siege.

Edit: Engrish

Bubba05 · Tue Dec 25, 2007 2:42 pm

Sorry jimmy my bad ment to be yards!! these things happen when your tired and staring at the key board through blood shot eyes!! God I love my job!

Bubba

boilingleadbath · Tue Dec 25, 2007 9:06 pm

"A-treb demo only allows 40kg counterweights"

So? There is no viscous or form drag during the launch phase of a treb, so it scales perfectly.

Change the mass of everything else in the design so that you put in the same object_mass:counterweight_mass ratio in ATREB as you are actually planning to use.

(ie, if you have a 400kg counterweight and a 15kg arm, you'd tell A-treb that you are using a 40kg counterweight and a 1.5kg arm.)

tansit234 · Tue Dec 25, 2007 9:53 pm

In my junior year of highschool a friend and I built a trebuchet with almost the exact same dimensions and a 650 pound weight. You need a solid steel axle first off. Also, the trebuchet we built was able to send a 2 liter full soda bottle across a full acre. We tested it in a good flat field and had something like 75 to 80 paces (average pace being 2.5-2.75 feet). The release hook was about a 30 degree after tuning, also the sling must be less than the hook to axle distance, preferably 2/3. The throwing arm was probably a 3.5:1 or 4:1, something like that; slow start but really flung the sling around.