Activity

I got to see some old stuff down in CO Spgs at the airport. Dick Janatell owns the land the airport is on and has a collection in some of his many hangers. I did some work for him years…   Read more»

Is the DR1 the plane you are building? I think you told me once but forgot… The old WWI planes are the only reason I would get my pilots license. They are so elegant and amazing…..Now this propane gun totally…   Read more»

Is the DR1 the plane you are building? I think you told me once but forgot… The old WWI planes are the only reason I would get my pilots license. They are so elegant and amazing…..Now this propane gun totally…   Read more»

Scott, sorry it’s taken so long to get back to you. I found a schematic that I can modify that will probably do what you need. I’ll have to draw it up. But I have too many things to do…   Read more»

Scott, sorry it’s taken so long to get back to you. I found a schematic that I can modify that will probably do what you need. I’ll have to draw it up. But I have too many things to do…   Read more»

Again, what Warren said. Yes, you can use one to trigger the other when they’re in one-shot mode. Let me go through old schematics that I have… somewhere… Warren’s right about the flip-flop chip, too. The timing is done with…   Read more»

Again, what Warren said. Yes, you can use one to trigger the other when they’re in one-shot mode. Let me go through old schematics that I have… somewhere… Warren’s right about the flip-flop chip, too. The timing is done with…   Read more»

If you want them synchronized, that’s different. You’d have to tweak the timing pots to get equivalent timing as what I was talking about was two independent circuits with a common power supply.Why not use a single 555 with a…   Read more»

They are two, independent timers on one chip. You just adjust them to any sequence you want. Forget the sinking and sourcing. If you’ve made a 555 work, then you’re fine. Do you have a 556 schematic? You can get…   Read more»

Looks like an evening with some breadboard and a little pile of parts.WarrenYes maybe for you. :?To answer Gregs question: “propane powered machine guns”.They dont fire projectiles of coarse. But they do make a loud rapid repeating report.And yes it…   Read more»

They are two, independent timers on one chip. You just adjust them to any sequence you want. Forget the sinking and sourcing. If you’ve made a 555 work, then you’re fine. Do you have a 556 schematic? You can get…   Read more»

Looks like an evening with some breadboard and a little pile of parts.WarrenYes maybe for you. :?To answer Gregs question: “propane powered machine guns”.They dont fire projectiles of coarse. But they do make a loud rapid repeating report.And yes it…   Read more»

Scott, what Warren said. Simple. Just remember you have a 200 mA limit to what you can sink or source.What??? 😯 Whats sink and sorce?? :?You guys got to remember, it took me 3 days to get this working on…   Read more»

Scott, what Warren said. Simple. Just remember you have a 200 mA limit to what you can sink or source.

Oh man, Scott, what kind of trouble are you getting yourself into now???I just got back from a trip to the home brew store, at least MY creation is going to be drinkable – at leas I hope…..

That’s easy – a 556 has two 555’s inside it. Just duplicate the circuit. The 7812 is a 12V voltage regulator and the 1N4001 and 220 uF cap on the left are the power supply circuit. Everythiing else is the…   Read more»

Not sure how they’d compare in tensile strength, but aluminum threads can strip really easily. I didn’t even notice the weight of the rods in my LOC ebay. It kind of got lost in the mass of a 4″ rocket….   Read more»

Sure Ron, but you can also go with just smaller diameter all thread. You could try 6-32 or even 4-40 for an electronics bay.Doug

would not have much of a web if you tried this with APCP

Contrail and RattWorks both have 48 inch hybrids in 38mm. Mostly interesting because your expenditure on NOX + grains is more newtons per dollar!http://www.contrailrockets.com/Products/prod01.htm