2 stage

Done some searching but not really what I was looking for. Mostly older threads. Are there any kits made for HPR 2 stage? Anyone that has done second stage, any helpful tid bits would be great. Got a project in mind. Thanks.

Don’t over complicate the interstage connection. Use enough overhang from sustainer casing so it doesn’t wobble under a side load. Test that aspect on ground before flight.

Hey Andrew, send me a PM.

The only 2 stage HPR ‘kit’ that I know of is the PML Quantum Leap.
https://m.publicmissiles.com/extreme_alt.aspx

All of the Wildman Jr kits have a 2-stage upgrade option.

https://wildmanrocketry.com/collections/wildman-junior

Try a Google search for Madcow Double Shot and another search for Madcow Nike Apache. You should find a pretty good amount of info.

Wild man makes some pretty good 2 stage kits. The Jr models have small AV bays. I like the 3" WM. https://wildmanrocketry.com/search?q=wildman+2+stage
Here are some good reads on 2 stage:
https://www.rocketryforum.com/threads/safely-flying-hpr-multistage-rockets.133055/

thanks guys.

Exactimator said:

Try a Google search for Madcow Double Shot and another search for Madcow Nike Apache. You should find a pretty good amount of info.

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I reckon the Double Shot is an excellent kit for a first HP 2 stage attempt.

https://www.madcowrocketry.com/2-2-4-fiberglass-double-shot/

The interstage has enough room to do what you want and with a standard 54mm MMT has enough potential for going hard. Another club member has one with a 75mm MMT where he is planning to go hybrid. The av bay on the sustainer is a little tight but I managed to squeeze a Marsa54L with Pyronet to a Pyrobridge in the interstage. Excellent flights.
BTW that's me in the second set of pics on the page
Cheers

Under "advanced rocketry" we have a new thread dedicated to staging-airstarts-clustering. They have moved many 2-stage threads to this new arena. Right under "research", check it out for tons of info.

LOC makes a 3" booster that fits with three of their 2.26" models.
https://locprecision.com/product/terrier-booster/
I got this with the Sandhawk kit - next in my build pile and will be my first attempt at 2 stage. I bought the MC Nike/Tomahawk kit last year but thought I would start off with something a little "easier" first.

Faroutspacenut said:

LOC makes a 3" booster that fits with three of their 2.26" models.
https://locprecision.com/product/terrier-booster/
I got this with the Sandhawk kit - next in my build pile and will be my first attempt at 2 stage. I bought the MC Nike/Tomahawk kit last year but thought I would start off with something a little "easier" first.

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Have you built this? I'm starting mine.

Big_Red_Daddy said:

Have you built this? I'm starting mine.

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Yep. In fact I finally got around to doing my ground testing today. Nice looking kit. I'm planning on flying it this coming weekend but first with a dummy motor in the sustainer so I can get the timing right for the air start. The inter-stage coupler is a little too snug on the sustainer though - I worry too much so for the needed drag separation, so I'm going to need to work on sanding that down a bit.

Faroutspacenut said:

Yep. In fact I finally got around to doing my ground testing today. Nice looking kit. I'm planning on flying it this coming weekend but first with a dummy motor in the sustainer so I can get the timing right for the air start. The inter-stage coupler is a little too snug on the sustainer though - I worry too much so for the needed drag separation, so I'm going to need to work on sanding that down a bit.

Click to expand...

Have you considered using a separation charge? It takes a surprisingly small charge to pop your sustainer from the ISC, even then they are very tight. I would assume 0.3 grams FFFFg would do the trick (that's what I'm templating to use in mine)