For ground testing, do not lay it on a wooden chair with the fins resting against the arm of the wooden chair! I did that and the force of the ejection charge not only separated the rocket, it also blew the arm off of the chair (the fins pushing backwards tore the arm off). After repairing the4 chair before my wife got home, I simply laid the rocket on the ground. Also, do NOT put anything inside the altimeter bay that is loose. I thought I would put a weight inside the altimeter bay to simulate the weight of the altimeter and the sled. Since that was loose, it was free to move around and the force of the ejection charge caused it to rip all of the wiring and switches in the altimeter bay apart. Another valuable learning experience. At lease I didn't have kids hold it while I fired the charge. Mike Michael Lesnick Axiom Healthcare Group 18135 Santa Lauretta Cir Fountain Valley, CA 92708 714-594-5720 - Office Phone 714-323-5968 - Cell 714-968-7076 - Fax MikeL@xxxxxxxxxxx -----Original Message----- From: roc-chat-bounce@xxxxxxxxxxxxx [mailto:roc-chat-bounce@xxxxxxxxxxxxx] On Behalf Of Bob Brown Sent: Thursday, June 14, 2012 4:49 PM To: roc-chat@xxxxxxxxxxxxx Subject: [roc-chat] Re: Dual Deployment advice Thanks everyone for your deployment tips. Really helpful. The rocket in question is a Madcow fiberglass Black Brant. 3.9" Regarding ground testing. What methods are used to "hold" the rocket? What is the best way to set off the deployments on my altimeter when on the ground? Thanks again. Bob On Jun 14, 2012, at 12:24 AM, Mike Riss wrote: > --- On Wed, 6/13/12, Bob Brown <cineflex@xxxxxxx> wrote: > >> . . .but am not sure of a design for holding and igniting the BP. >> Any advice about these or other systems would be appreciated > > Here's some info on do-it-yourself methods: > > http://www.info-central.org/?article=302 > > http://www.wimpyrockets.com/page16.html > > http://www.thefintels.com/aer/rocketelectronics.htm > > And, I'll add to the question about which kit: and what altitudes? > > Mike > > -- > ROC-Chat mailing list > roc-chat@xxxxxxxxxxxxx > //www.freelists.org/list/roc-chat > Bob Brown http://us.imdb.com/name/nm0113141/ http://www.tripoli.org/ #9186-L3 -- ROC-Chat mailing list roc-chat@xxxxxxxxxxxxx //www.freelists.org/list/roc-chat -- ROC-Chat mailing list roc-chat@xxxxxxxxxxxxx //www.freelists.org/list/roc-chat