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I happened upon these videos today and thought the technique that the guy uses to support large unsupported spans is pretty clever. The first video shows the technique and the second one takes it a step further. Randy

Guys, I'm wrapping up the design of a rocket for the grandkids and was wondering what you guys think of the current launch lug configuration. The launch lug is part of the fin can (3D printed) and is 4 inches long. The overall length of the model is 21 inches. Do you think I can get away...

Has anyone flown Estes motors in printed ABS motor mounts? PETG info would also be helpful since if PETG doesn't warp, then ABS won't. I'm interested in cases where the motor is right up against the mount. I know that I could insulate with a carboard liner but I'm working on a project where...

Apologies if this has discussed already. I've been having a heck of a time with PETG. The prints come out great but they stick like crazy to my printer's PEI bed surface, to the point where I've damaged prints and almost damaged the bed trying to get them off. I tried Magigoo which claims it...

I've always wanted a 4" Fat Boy so I recently pulled out the old Lulzbot Mini, dusted it off and started experimenting. I have a couple different projects in mind that require threads so I started playing around with that in PLA and tweaked things until I had those working well. Then I printed...

Does anyone have a good scan of the FP-15 pattern sheet for the Sprite? The one on the JimZ site is kinda low res. Thanks, Randy

I decided to take a look at firing currents for ejection charge initiators and thought you guys might be interested in the results. A lot of flyers, including myself, often use 2, 3, 4 amps or more to fire these things. If you look at the specs for MJG Firewires, they recommend a nominal...

I wasn't sure what section to put this under so I'll try it here. I've been wanting to refamiliarize myself with SolidWorks so I decided to model one of my favorite rockets as a kid, the Mars Lander. The ML is complicated enough that I figure if I can do that, I can most likely do anything...

I'm looking for opinions on fiberglass airframes for HPR. Any quality differences worth noting? Currently looking at Wildman, Madcow and Rocketry Warehouse. Thanks, Randy

This is a shot in the dark, but are there any 3D models available for Aerotech HPR casings? Thanks, Randy

Sorry for the dumb question guys, but slowly getting back into HPR after being out for a while. Most of my 29mm and 38mm rockets still use motor ejection. I want to order some AT reloads and it looks like everyone now only sells them with medium delays? So, it looks like I just buy mediums...

Does anyone know if the fins on Aerotech's G-Force are the same as their Astrobee-D? They look similar. Thanks, Randy

I'm trying to decide what type of rail guides to use and am looking for opinions from those who have used them. I've always liked the Acme conformal lugs for rods and had pretty much decided on their conformal rail lugs until I saw a post on Rocketry Planet where it was stated that some clubs...

Guys, I've been out of HPR for about 5 years or so. What are the best online places these days for airframes, nose cones, etc. I'm looking for easy online ordering and a good selection from PML, LOC, etc. Thanks, Randy

Has anyone used PML phenolic couplers with LOC airframe? In particular, I'm interested in LOC's 54mm airframe with PML 54mm couplers. By the dimensions on the websites, it looks like it may be a tight fit. Thanks, Randy

I just received my LEUP application packet in the mail today. I received form 5400.21. I thought I would be getting 5400.13. When I called the licensing center, I told them it was for hobby rocketry. Both forms seem to be valid downloads from the ATF website. Does anyone know which one is...

When my LEUP ran out in 2002 I had a storage variance for my attached garage. I'm going to start the process to day to renew or get a new LEUP. Is an attached garage still the current standard for storage variances? Has anyone been able to get a variance for storage in their basement...

Guys, Getting back into HPR after 4-5 years off. My goal is to go for my level 3 and I have some catching up to do. I'm wondering how the high power pads are set up nowadays. When I left rocketry, I was flying J and K motors off of mainly 1/2" rods and rails were just starting to become...