Activity

Not sure Doug. Jim Amos is the Master mind behind the math. I got it from him when I was doing my L3 stuff and talked with him about the formula he had previously(and others formulas that have been used…   Read more»

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

Conway, where does the 0.0004908 come from?Doug

Ive always used 3 equally spaced ports. less chance for anomaly or issues from pressure induced stuff. Holes to large cause to early of deploy. Holes to small cause late deploy Mine have always been right at the very end…   Read more»

Speaking for myself, I have often found the prescribed hole sizes to be too small — largely because I tend to stuff wires back through instead of using switches.Many, many of the rockets I have flown have had static ports…   Read more»

Here is the math you need to get what you want.Bay Volume = radius * radius * length * PiSingle Vent Diameter = 2 * SQRT ( volume * 0.0004908 / Pi )Single Vent Radius = Single Vent Diameter /…   Read more»

Like BP, my broad rule of thumb is “more is better”My L3 is standing at 5-6 calibers, and I’m confident it will fly straight. Lighter models will weathercock into the wind the more stable they are, but for high power…   Read more»

Honestly, the only time you ever have to worry about overstability is when you fly a rocket on a motor that can barely lift it in high winds. Unless you’re doing that, more than 1 or 2 calibers is just…   Read more»

I’m a bit of a heretic in this department. Old timers will smile and remember my many iterations of “BoB”, which was a Vaughn Brothers kit. “BoB” had perhaps 12-14 calibers of stabilit. BoB always flew bullet straight.I would guess…   Read more»

That seeems fine to me. 1 caliber is a minimum for most applications. I usually design my scratch builds for 1.5-2 calibers with motor loaded. It will allow you the flexibilty for some bigger motors too. The only real drawback…   Read more»

I’ve got one right here. Feel free to call me and come by today. I’m in West Longmont near 9th and Hover.Warren

Xman,I have a 24″ piece of LOC 29mm tube that you are welcome to as I’d hate to see a project postponed for a lack of a motor mount.I’m near 287 and Lookout between Longmont and Lafayette. I’ll send you…   Read more»

They didn’t have any when I was there yesterday…

Hobbytown is out?I was there a couple weeks ago, and they had a bunch of 29mm tubing…

Thanks Conway, Bruce, Warren, Mike, John and Chris (hope I didn’t miss anyone) 😛 . As Conway mentioned, I KNOW for a fact that there are more factors involved than I am considering, since this is my first attempt to…   Read more»

I like JW use alot of the same ways in recovery. Most of all my recovery has all been done without a drogue chute. Most times it was with a wide and long nylon custom built streamer. In fact when…   Read more»

My booster shock cord is typically 2 or 3 times the total length of the rocket and my main shock cord is typically 3 to 5 times the total length of the rocket.My booster separation will be at 60′ separation,…   Read more»

I mount the drogue within 2′ of the end of the booster section and the main 2/3 of the way to the nose. My booster shock cord is typically 2 or 3 times the total length of the rocket and…   Read more»

OK, I’m pretty set on using a drogue at this point, so if anyone has ideas or opinions on the best attachment point that would be awesome. Main focus is to keep the two parts from banging into each other…   Read more»

OK, I’m pretty set on using a drogue at this point, so if anyone has ideas or opinions on the best attachment point that would be awesome. Main focus is to keep the two parts from banging into each other…   Read more»

Here is my two cents worth.I have never flown a duel. I am just about done building a duel.My first NCR launch. I watched a large rocket take off. Big motor, Bigrush. I was soooo impressed. The rocket finished its…   Read more»