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Call HT Westminster. I was in there Saturday and I think I saw one stick of 3″. But, don’t quote me on that……

Have you tried ordering from http://www.commonwealth.net? They’ve given me great service, and they show the 3″ QT for about 18 bucks.Ken

Ya im half tempted to just cancel the order. Ill give them to the end of the week. I decided not to launch this rocket next launch so no hurry anymore. Ill give PML a call.

HT in longmont is out and is who it is back ordered from. Wouldnt suprise me though if there is some sitting there, nobody ever seems to give a rats ass about the rocket guys there to check. I get…   Read more»

HT in longmont is out and is who it is back ordered from. Wouldnt suprise me though if there is some sitting there, nobody ever seems to give a rats ass about the rocket guys there to check. I get…   Read more»

HT in longmont is out and is who it is back ordered from. Wouldnt suprise me though if there is some sitting there, nobody ever seems to give a rats ass about the rocket guys there to check. I get…   Read more»

Hobbytown in Longmont used to have a few sticks of Quantum. Give them a call.Ken

Giant Leap has Dyna-Wind. Sure seems like a goodproduct. Tim may have some..http://www.giantleaprocketry.com/hpdefault.asp

Mike, that is really nice!

With redundant charges and altimeters, you can be sure that they will NOT fire simultaneously – especially if you use different altimeter brand/models (smart idea by the way). As I said, I use a calculator based on internal volume and…   Read more»

Concerning the charges do not seperate your charges to two canisters. Atleast dont split up the calculated charge in half. If you need 4 grams for your main, dont put two grams in two canisters. Put 4 grams in each….   Read more»

I use the Art Hoag Method – I use the calculator to determine how much powder needed and then double it – at least.((This used to be known as the Wilke method))

Photo by Ray LaPanseI was looking at Rays great pictures, found this awesome looking rocket. Mike, in the picture, instead of behind the camera. 😀

I have an old chute that I fried DOING a ground test. But that’s good because I can simulate different chute sizes and weights with it now. Has worked successfully for numerous rockets, including the one in the picture to…   Read more»

Yes…Last years ground testing burned a hole in my chute. I was glad I didnot have the shock cord hooked to the rocket. It would have ran away.Also this year I will have redundant charges. I built it for that…   Read more»

Ken, you are correct, though I’d add one caveat – go a bit heavier on your charges than you might otherwise think on your ground tests, because if you DON’T separate, you might cook your chute 8OAlternatively, I like to…   Read more»

Mike,The only thing I would have to add is that when you ground test, do it with the chutes and harnesses packed exactly as you would if you were flying it. Eliminate as many variables as possible.

No experience with anything that big, but I’d recommend ground testing starting with about half your calculated charge and work up. BP is cheap, but the rocket either not coming apart, or coming apart in too many pieces is very…   Read more»

I know this may be kicking a dead horse..I have always seemed to put large charges in.I have alway used Verns Charge Sizing. He suggesteson an 7.5″ rocket using 1gram per 6″ of airframe.(airframe to be preasured)Now. When caluculating I…   Read more»

Charge calculations should be based on the amount of airframe volume you need to over pressurise to break the shear pins and push the laundry out. Ground testing is the best way to actually determine the size of charge you’ll…   Read more»