Hey

Soon i was hopeing to test kno3sugar rockets against kno3 sulphur sugar rockets. I am most likey going to be useing parabolic motion to judge the alittuted difference. Such equations as V=U+atsquared and the such and results based from the time taken at the apogee to reach the ground. I figure this will be enough to judge accuratly how far apart the appoges will be since the rockets are going to be the same however judgeing the total heights will be diffcult since the falling objects should reach terminal velocity and parabolic motion equations that iv use, dont take this into consideration.

So i was wondering does anyone know how to figure out (equations or whatever) of how to judge the terminal velocity of my falling shells?

if your looking for the Alt. why not just use an altimeter ?

it measures the exact altitude of your rocket at apogee

and the velocity and the gravitational forces...

and so on ...

once i discuss it with my buddy were going to start producing altimeters with LCD displays that give you the information ...

so once they are put into production i will post it on here is any one is interested in buying one ... also the software will be upgradable so you can ship them back and get the software upgraded

[This message has been edited by warweed12 (edited 07-26-2003).]

Zero's site on krimzonpyro had a section about kno3/sugar rockets, and some stuff you should read about a better formula for the fuel. http://krimzonpyro.com/zero/Articles/Sugar_Rockets.html

Altimeters arnt the most common things to find around here, i dont think. How big are they, weight, price?

This is what a standard altimetere looks like that pyrotec sells (shitty low quality) that goes for $90 we hope to sell them a lot higher quality with alot more add ons and features along with computer interface software so you can download the stats and graphs and print them out .. pretty much every possible calculation you could do this thing will do it

height, speed (Kph Mph Mps Fps), Fall time, thrust, burn time, coast time, fires ejection charges, the list goes on were planign to sell them for under $150 canadain the most expensive part on the board is the pressure transducer...

http://www.pyrotek.org/images/Altimeter.jpg

i will let you know more clearly when we get the exact specs done ...



EDIT: Momma said horizontial scrolling is da devil....

[This message has been edited by warweed12 (edited 07-28-2003).]

Also a problem with useing an altimeter is the fact my rockets dont use ejection charges, thust no parachute..they just dive towards the earth and id be a little worried equipmening one of my rockets with a $90 device to have it smash to bits when it lands. With your altimeters you should give them a little armour.

Anyway il probably just say air resistance is neglectiable

Horizontal scroll is the devil.

Do u think that with solid rocket fules (made from realisticly-obtainable chemicals) one could ever get a rocket up to 11 KMs/s? Also does anyone know what NASA uses in the Sold Rocket boosters on the space shuttle?

i dont think you will get a rocket at 11kms. I believe the fuel was NH4ClO4 (ammonium perchlorate)/Al/Fe203

If your using the projectile parabolic flight trajectory you cannot achieve accurate results because rockets do not follow purely parabolic paths. Negating wind resistance and gravity flux, a projectile (which is any object whose flight is determined by a force acting not of its own accord but rather of a separate object, i.e. cannon and its projectile) will follow a parabolic path.

In other words, use an altimeter because your gonna get the most accurate results.

lol thank you ...

the altimetre is what sets off your ejection charge .. aslong as you have some sort of heat block between the motor and the altimeter .. perhapes make an avionics bay then the altimetere is set to fire current through the igniter into a baggie of black powder used as and ejection charge ... thus poping the cone and and ejectiong the parachue

also you could try leaving a section of uncored propellent at the top of your engine then put al little bit of pack powder and a plug on the end of the engine....

you would have to fool around with the amount of delay but it could be done ...

Thats why im going to fire the rocket vertical and time only on the way down. Also my rockets dont use ejection charges and the such, comepleatly homemade. I dont want to go to large efforts placeing charges and altimeters on the end because not only is this a lot of work but i tend to make the rockets cheap so i can fire them and leave the carcas behind.

When making this copostion http://krimzonpyro.com/zero/Articles/Sugar_Rockets.html ... Rocket fuel ... when do you mix in the Iron Oxide?

It just says mix the sugar and nitrate together and melt it... nothing about the Iron but the ratio. So does anyone know how to mix it all together properly (ie: does the Iron have to be melted too, etc.)??

A local Hobby store sells *decent* altimeters, but why would I need one...

My brother is in 11 grade and has already completed Most of the College study for math, so I am pissed because he is gonna use his college fund for BioTechnoledgy(sp) courses at Duke and Such. And I wanted that money, I am gonna need it for those extra years it's gonna take me to get through college.

quote:Originally posted by And1Drew:

When making this copostion http://krimzonpyro.com/zero/Articles/Sugar_Rockets.html ... Rocket fuel ... when do you mix in the Iron Oxide?

It just says mix the sugar and nitrate together and melt it... nothing about the Iron but the ratio. So does anyone know how to mix it all together properly (ie: does the Iron have to be melted too, etc.)??



thats a standrad comp not many people kow about the iron catalyst ..

but you onl need to add about 1% to 1-1/2 %

for it to be effective ...

Yea I know, but when do you add the Iron into the mix?

Do you melt it first, then add the Iron, or do you add the iron before you mealt the mix?