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Any long conical nosecone would work. For example a 4" fiberglass cone:

http://rocketrywarehouse.com/product_info.php?products_id=297

They also make a 3" version. What issues are you running...

There was the same issues with the GLR slimline motor retainers. They recommend simply grinding the thrust ring down until it fits.

On any altimeter, it is possible to put two e-matches per output in parallel for redundancy. If you get commercial e-matches, they are very reliable. I've had good success with J-teks and Quest...

Sounds right.

One thing I've found after building fiberglass rockets (but I guess it could be any rocket for that matter) is tape off EVERYWHERE you don't want epoxy while doing external fillets. I like using...

There is a way to change the main parachute deployment altitude using the pushbutton or using the computer interface once it is plugged in. Both ways are described in the users manual. If you want...

I wouldn't be afraid of launching in uncontrolled airspace. You are right that some pilots out there don't check NOTAM's but having radios has nothing to do with whether a pilot needs to or is...

Or just turn off the "3D" in the settings panel of the video...

I really like my PerfectFlite SL100 Strattologgers. They are available for around $72 ($68 if you buy more than one) direct. It looks like the RRC3 will be worth the wait and has a staging/timing...

The highest capacity I've ever seen are the 1500# swivels that Giant Leap and others sell http://giantleaprocketry.com/products/components_recovery.aspx#Swivels Actually GLR includes a 7000# swivel...

For under $50 your best bet would probably be Adept altimeters or a Perfectflite APRA http://www.perfectflite.com/apra.html. Although for that price, you will only get max altitude recorded. If you...

Post a picture?

They can be a little loose, it gives a little wiggle room if the buttons are not mounted exactly right. I tend to turn the screw until it takes out the wiggle, but not tighten them down. ...

I got a few solenoids for a school project a few months back. Overall positive experience.

Is the ARCAS going to have a filament wound nosecone? I'm building an HV variant with a gel-coat cone but I'd be interested in getting a filament one if they are available.

coffee

I'm pretty sure that you'd have to justify the metallic components. For at least the NAR safety code, you can only use ductile metal when necessary. In an N5800 minimum diameter attempt, I don't...

We used to have a cat that could eat an entire bowl of cantaloupe in one sitting. It got the nickname "melonball" shortly afterward. Funny thing was that he was picky, wouldn't go near watermelon,...

Very cool! I made a homemade wrench from a PVC coupler for my 75MM motor but this looks like an even better solution.

Soller Composites has 60" wide breather fabric and release fabric http://www.sollerpaddles.com/composites/tools.html#release

Keep in mind that different chutes have different Cd's so if chosen carefully you may be able to go up/down a size and still achieve a good result.

For small scale, a solid/hybrid motor will be your only practical options. Liquids are too complex to feasibly scale down that far. If you were to make your own motor I'd strongly recommend a solid...

I agree that black screws look really nice with black rail buttons. However I'm not a fan of using the plain alloy black oxide screws due to low corrosion resistance. I tend to swap out the included...

Are you aware of the junior NAR certification program? http://www.nar.org/hpcert/jrhppreq.html

Check out post #16 of this thread that I made http://www.rocketryforum.com/showthread.php?24028-Electronics-in-Nike-Nosecone for a "burrito" style deployment. If you put electronics in the nosecone...

Yeah that one would work great. You could even go smaller if you are pressed for space, the idle power draw on the altimeter is incredibly tiny. As long as you get one that can pull a couple of...

Power range is 4-16 Volts. A 3.7 LiPo will get slightly above 4 volts when fully charged but I'd go with a 2-3S battery to be safe. I've run SL100's with Turnigy LiPo's and they work great.

An F54 or F75 would be a good choice. Make sure to do nice internal fillets and you should be set. Anything with G10 fins will usually survive a hard landing.

Yes, typically on L2-L3 rocket projects people use two completely independent systems with their own power source, battery, and ejection charges. However from what I've seen most people use a single...

Stainless PEM nuts, weird size taps (8-36), shear pins are nice in bulk.