Doug Gerrard

Another cause of cartwheels that almost nobody ever talks about is a lateral mass offset. If the center of mass is a little bit away from the centerline, then the motor thrust will make your rocket pitch over. I had…   Read more»

Most, but not all, of the equations are based on a physics MIT graduate student named James Barowman who, with others, came up with them in the late 1960’s. Estes an Centuri produced booklets with graphs for you to design…   Read more»

Check out these sites:http://my.execpc.com/~culp/rockets/Barrowman.htmlhttp://www.webcalc.net/calc/0225.phphttp://www.apogeerockets.com/Education/rocket_stability.aspDoug

Let’s do the Math :D9000 ft / 30 ft/sec on a streamer is 300 seconds or 0.08333 hours3 miles / 0.08333 hours is 36 mph wind speed.I don’t remember the wind being that fast but it’s possible. Of course…   Read more»

Whats to keep me from building 2 identical Rockets, or 2 identical ebays. Launching one, and bringing back another…

I hope the person certifying you remembers this… Doug

The Parrot would not exist if I had not designed it for setting records with my own rockets.Adrian, there lies in the nature of the skepticism. I don’t fly altitude attempts but I have been around the rocket community for…   Read more»

I had to shrink the first image so it wouldn’t be so big on the screen but the others are just cropped but original size images of a few sections. I did get enlargements to send to Brent and others….   Read more»

Those booster attach fittings were really interesting. I couldn’t figure out how they worked.There was a few others interested in them. I had a hand in their development but my friend has a web page describing them. Their is a…   Read more»

Found: A very odd rocket part that appears to have been some sort of an outboard booster. It was red, about 54mm, minimum diameter, and had what appear to be 2 mounting pads on one side, and 2 fins on…   Read more»

I’ve used 3 grams for my BDCR rocket for years and it was plenty. It was 6″ and at least 24″ long and it tested OK with 2 gms. I went to 3 for safety. The calcualtor said 6 grams…   Read more»

8OI don’t know how many ounces but I feel it in the wallet when I go to process it!Doug

Where’s the rest of them?

Still in my shop. These are just the ones I’m using at the launch….Doug

Everyone got their cameras ready?

Half past Dark. No particular time, just after everyone gets dome eating dinner and the screen and projector gets set up. There will be free popcorn like last july.Doug

I’m sure I’ll be making a nuisance of myself and asking to photograph many of your birds while they are sitting at your campsites too! John, the biggest nuisance might be the asking 😀 Just kidding of course. But feel…   Read more»

Technically its not Battle of the Acronyms since I’m using Little Freeze Frame but it should be a good drag race. The simulations are nearly identical for the first few seconds. Again we’re trying to film a rocket in flight…   Read more»

There will be plenty of people to help you. I have programmed the RRC2 mini but I still use a cheat sheet. It is not necessary for dual electronics. I would recommend you invest you money on motors and get…   Read more»

I’d love to work with someone who has staged something and we do a K-to-K project.

You’re on John. I prefer not doing it minimum diameter but that too sounds interesting (challenging).Doug

Thanks James, anytime. If anyone is looking to relocate, think about heading south. I work at a really great place and I would love another rocketeer down here.Doug

You know all of you are welcome in my shop. I have a large space (1800 sq ft) with high ceiling, abundant workbench space, and heating and air conditioned. However, you may wish to think about carpooling Seriously, if…   Read more»