tag:blogger.com,1999:blog-38795037.post6324430431802975562..comments2023-06-13T22:42:26.897+10:00Comments on Air Command Water Rockets: Rings, fins and other thingsGeorge Katzhttp://www.blogger.com/profile/05735356042927822858noreply@blogger.comBlogger5125tag:blogger.com,1999:blog-38795037.post-17189180264157066932009-06-04T11:37:38.014+10:002009-06-04T11:37:38.014+10:00Hi Daniel,
To find your center of gravity tie str...Hi Daniel,<br /><br />To find your center of gravity tie string around the body of your rocket and then hang the rocket by the string. Move the string up and down the body until the rocket is balanced (horizontal). That is the center of gravity. <br /><br />To find the center of pressure is a little more tricky. Here is a good reference:<br /><br />http://www.grc.nasa.gov/WWW/K-12/rocket/rktcp.html<br /><br />You need to make sure that the center of gravity is ahead by about 1.5 body diameters of the center of pressure. If it is more that's okay, if less then the rocket becomes marginally stable.<br /><br />The second stage on the Acceleron V rocket does have normal fins. There is clearance along the length of the boosters for them. (That's why there is a ring at the top. )<br /><br />Cheers<br /><br />- GeorgeGeorge Katzhttps://www.blogger.com/profile/05735356042927822858noreply@blogger.comtag:blogger.com,1999:blog-38795037.post-994949313039276022009-06-04T02:38:29.831+10:002009-06-04T02:38:29.831+10:00Hi George
Is good see that you are making progr...Hi George<br /><br /> Is good see that you are making progres on the Aceleron V, thanks for answer my cuestion too.<br /><br /> I got a cuestion about the gravity center. How can I do for know that the gravity center is in the right place?<br /><br /> The upper stage from the Aceleron rocket will leave fins?<br /><br />Thanks a lot for your patient.<br /><br />Good luck with your rocket!!<br /><br />DanielDaniel Veirahttps://www.blogger.com/profile/05853224926031713827noreply@blogger.comtag:blogger.com,1999:blog-38795037.post-20231696159289190002009-06-02T20:20:43.695+10:002009-06-02T20:20:43.695+10:00Looking good George.
Can't wait to see it fly :o)...Looking good George.<br /><br />Can't wait to see it fly :o)Mat_Gnoreply@blogger.comtag:blogger.com,1999:blog-38795037.post-27940406280019489412009-06-02T08:43:44.787+10:002009-06-02T08:43:44.787+10:00Hi Tom,
We are only going to paint sections of th...Hi Tom,<br /><br />We are only going to paint sections of them. The splices are pretty ugly so we paint them white (like that seen on the sustainer in the photos). We like to be able to see into the bottles to see what is going on. We now only use very light colours as the sun can heat up dark colours and distort the bottles.George Katzhttps://www.blogger.com/profile/05735356042927822858noreply@blogger.comtag:blogger.com,1999:blog-38795037.post-10673381692871491422009-06-02T00:33:14.168+10:002009-06-02T00:33:14.168+10:00Hi George
Are you going to paint the bottles?Hi George<br />Are you going to paint the bottles?Tom Stantonhttps://www.blogger.com/profile/11348739895923171661noreply@blogger.com