Doug Gerrard

I have such a scale that I take to all the launches if you can wait until MHM. It has a 150 lb capacity with an accuracy of 0.2 lbs.Doug

If it is possible, can you glue one end into a section of body tube? If you block the other end for the charge then you have an opening in the side of the coupler tube to slide the electronics…   Read more»

No, don’t do them in series. You should bring one wire from each igniter and twist them together, then do the same with the other wires. That way they are in parallel and you can use the same set of…   Read more»

There are many companies out there but here are just a few. I have the Rocket Hunter http://rockethunter.com/ receiver and transmitter. I like them a lot but one disadvantange is the size of the transmitter. It’s not huge but for…   Read more»

Check out http://www.info-central.org/index.cgi?supportFor a multi channel launcher http://www.info-central.org/index.cgi?supportDoug

I agree about clustering in series. I did it mostly to see if it would work but I’ll re-iterate, its not something I recommend.Yes, I’ll be there showing movies on Friday night. But I’m not sure what I’ll be flying…   Read more»

If you hook up in series one motor will light and the other will not. Not true Conway. I don’t recommend using ignitors in series but I have done it on a cluster of 4 motor and they ignited within…   Read more»

Joe, I’d like to have a sticker. Save one for me if you don’t mind.Doug

Hi Warren,I too have looked for such V-shaped strips but the only thing I could find (pre-made) was the wood strips used in RC airplanes. I just opted for round carbon rods for my subsonic flights…The only other idea that…   Read more»

Single Vent Diameter = 2 * SQRT ( volume * 0.0004908 / Pi )

Conway, where does the 0.0004908 come from?Doug

Did I pay my truck insurance this month?-or-I’m not sure which hurts more, losing my rocket or my truck…

Will the piston drop down at lift off? Yes, possibly. It depends on the obvious factors, how tight the piston is, the acceleration of the rocket, etc.Do I need to put a stop..To eliminate this?No, the only thing to consider…   Read more»

I tried hitting submit but the page re-appeared. I was in a hurry so I probably had something wrong with it. I hit submit again (and it reappeared again) so I just closed it out and went on my way…Doug

I tried a PM but was apparently unsuccessful. I’ll write you an e-mail.Doug

I have a couple that you may wish to consider using. I can write you off line with possible chutes that may work for you.Doug

Yes, but I was just trying to get clairification which you did. It seemed like the list of records was rather lengthy but you explained it very well and it seems fair.Doug

1 – NCR Club altitude records should, in general, be restricted to club members flying from the club launch sites with the sole exceptions being altitude shots requiring a greater waiver altitude than those at NCR venues. (Club Records)2 -…   Read more»

I think birds should come back in “certifiable” condition.I prefer the idea the rocket can be made into “flyable” condition on the same day. For example, a slight zipper could be cut off and flown that same day even though…   Read more»

Thats just the ejection baffle, you should see the motor mount! 😯

No, I’m using Rocket Hunter and I’m not sure the frequency. I can look it up if needed.Doug