- Joined
- Jan 22, 2009
- Messages
- 537
- Reaction score
- 221
As near as I can tell from fooling around with OpenRocket and cardboard cutout(!), the CP of Barbicane is just below the third centering ring below the nose cone. I'd like to get the CG at or just below the centering ring above that, as shown by the arrow below:
So I did some weighing and balancing with lead shot, and it takes about 6 ounces of shot plus an ounce or so of epoxy and a long eyebolt to get it there. I hogged out the nose cone to get the weight as far forward as possible, and left room in case a swing test(!), to be conducted after the tropical storm passes, shows I need even more. As it is, the model weighs 20.5 ounces ready to fly on an E30-4, which might take it to 355 feet at a leisurely 112 mph, if OpenRocket is to be believed.
[In the background is what's left of a 25 pound bag of bird shot that I got 20 years ago for nose weight, and shared liberally with fellow rocketeers].
Looking forward to a possible first flight in less than two weeks, but the weather will have to be pretty optimal to risk it!
So I did some weighing and balancing with lead shot, and it takes about 6 ounces of shot plus an ounce or so of epoxy and a long eyebolt to get it there. I hogged out the nose cone to get the weight as far forward as possible, and left room in case a swing test(!), to be conducted after the tropical storm passes, shows I need even more. As it is, the model weighs 20.5 ounces ready to fly on an E30-4, which might take it to 355 feet at a leisurely 112 mph, if OpenRocket is to be believed.
[In the background is what's left of a 25 pound bag of bird shot that I got 20 years ago for nose weight, and shared liberally with fellow rocketeers].
Looking forward to a possible first flight in less than two weeks, but the weather will have to be pretty optimal to risk it!