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Rschub > Interested in the 75mm Loki if still available. PM sent

I can deliver these at LDRS. I can also ship, but shipping not included. More pictures upon request. If you want the whole lot, make me an offer. Thanks for looking. Curtis 75mm Complete 2-grain Kodson motor, phenolic liner, nozzle, nozzle holder, bulkhead, o-rings, thrust rings 175 75mm...

Misc 54 mm EX cases. Delivery at LDRS. $400 for the lot, or if not takers, I will piece it out. 54/2800 Case and thrust ring, great condition 125 54/2000 case and thrust ring, great condition 100 54/1600 case and thrust ring, new 100 54/1600 case , new 75 54 case with dimple - you...

One Macklin tube slotting jig http://www.macklinmissileworks.com/shop/design-drawings-with-assembly-and-user-guides-rocket-tube-slotting-device. Great for cutting slots in fiberglass tubes. $100 If you want the router that goes with it, $80, but you can easily move the tabs for your own...

Ellis 38 case set and 7 reloads (3 I160 4 I230). Original packing. $200 for the lot Delivery at LDRS or other NE location.

I'll be traveling on Wednesday and attending Th through Sat. I will be giving my cluster rocketry presentation at TRITECH ... Thursday 7PM. Lots of tips for "getting 'em all to light" as well as clustering safety considerations. Curtis

There are a couple of corner cases you should test for….in particular, if your rocket transitions beyond Mach, there is a short pressure decrease. Depending on your apogee detection algorithm, you might prematurely trigger for apogee (at Mach!!) unless you account for this. How sensitive is...

I like this Sekey one I got off of amazon. I got the biggest one I could find, and I liked the extra large wheels. https://www.amazon.com/gp/product/B0BWYJ58FX/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&th=1 . It folds up fairly compactly.

Other lessons learned: The Adafruit 3178 module simplified the RF circuitry, as the LoRa radio module and microcontroller were on one board. I used header pins to connect this to the pcb board. However, the trade-off is cost. It would be cheaper to incorporate both mcu and radio module...

Relay board. I found a tiny automotive relay that can handle 30-amp, the Omron GN8-1U-AS DC12. It comes in 5V flavors as well. The challenge (for me at least) is designing a pcb that can handle 15-20Amp of current for short times. I used a very wide trace and had a double think layer of...

There have been a bunch of threads lately on both TRF and Facebook on launch controllers and wireless controllers. Some time ago I designed the RocketTrig system for remote control of ground based cameras...

At one of the NARCON presentations they talked in detail about finances, and those points are summarized in many posts above. In regard to the magazine, options were to reduce page count, or make the hard copy as a paid additional option.

Here is what the one for the 3/8 launch rod post looks like, although it hasn't finished printing. Zoro has some nice knurled knobs https://www.zoro.com/kipp-star-grip-din-6336-similar-d10-32x20-d1-25-external-thread-steel-black-plastic-cap-black-k01554a1x20/i/G3334816/#specifications The...

Inspired by a rocketryworks.com design (who is closing their doors soon), I whipped up a launch rod holder that uses 10-32 thumb knurled knob to hold the rods in place. I made two variants. One configuration holds 1/8, 3/16, and 1/4 inch rods. Another configuration will accommodate a 3/8 launch...

You are right ... it's not strong at all. I expect, though, that the velocity will be really low. Kinda like the Estes Dude rocket. I could always glass it. I'm 3d printing a NC so I can experiment with NC, no NC and various NC weights

Here is how it is shaping up. I omitted the forward weight and am going to rely on GDS as BigMacDaddy suggested. I ended up 3d printing two hub and spokes for the motor mount. Then I 3d printed a launch rail guide for the bottom (which might need to be replaced every flight. 7.5 in diameter...

I did build the tractor rocket in George Gassaway's thread, and I recently have built a moncopter and bicopter.

No, I don't trust the machines for an unusual geometry such as this. I'm just using its suggestion as a rough 1st cut.

BigMacDaddy Ah, that's a great idea ... better than Rube Goldbering the weight

I was able to model this in OpenRocket. To open, ones need a recent version, as it has phantom tubes. This took me through a cascading set of design issues: First discovery is that the CP is 3/4 the way up the cylinder, ahead of the CM. To move the CM forward, requires a large amount of...