- Joined
- Jan 21, 2009
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I planned to do a build thread on these as I was building, but time got short. So, I figured I would post these fun rockets now. My goal starting out was to see how fast I could go on a J570 and to gain more experience working with carbon fiber. Yes there or more powerful 38mm motors but I didn’t want to buy a new casing. While designing it I decided I will make a second one that is shorter and specifically meant for the H999 to see how may Gs I could pull/survive. So after a lots of thinking on and off out came my designs for Zoom (Goal: >Mach 2) and Poof (Goal: >200Gs).
Design:
The only way to reach my goals is to keep everything as light as possible with a few compromises. I did not want the added weight of a standard altimeter bay or dual deployment, so those were removed. The overall design of the rockets are almost identical except for different fin shape and tube length. Also, to save on cost, they will be sharing a nose cone.
Nose Cone: Eliminating those DD and the altimeter bay, I decided to mount the electronics (Raven & GPS) in the cone and for deployment I am using a Chute Release to reduce the landing zone. Originally everything was designed with a Mag switch in mind before the rule change. Adding a mechanical switch was a complex challenge.
Airframe: Rolled carbon tube using 3k Twill. I have done the sock tube, but this was my first time trying to roll a tube.
Fins: G10 plate glued on with RocketPoxy G5000. It was my first time using RocketPoxy and I was very happy with it! I did decide to add one layer of Tip-2-Tip carbon. I know it was not needed for these flights, but I figured I could still meet my goal and it would look better to me so that added a bit of unnecessary weight.
Motor retention: I am not a fan of losing casings so I wanted threaded retention to a bulkhead.
Laundry: Topflight 24” ThinMill chute, 10ft of 1000lbs Kevlar, homemade fire blankets, and a bit of dogbarf
Electronics: Featherweight Raven V4, Featherweight GPS, and Jolly Logic Chute Release. The GPS will have a magnetic switch and the Raven ended up with a homemade screw switch.
Design:
The only way to reach my goals is to keep everything as light as possible with a few compromises. I did not want the added weight of a standard altimeter bay or dual deployment, so those were removed. The overall design of the rockets are almost identical except for different fin shape and tube length. Also, to save on cost, they will be sharing a nose cone.
Nose Cone: Eliminating those DD and the altimeter bay, I decided to mount the electronics (Raven & GPS) in the cone and for deployment I am using a Chute Release to reduce the landing zone. Originally everything was designed with a Mag switch in mind before the rule change. Adding a mechanical switch was a complex challenge.
Airframe: Rolled carbon tube using 3k Twill. I have done the sock tube, but this was my first time trying to roll a tube.
Fins: G10 plate glued on with RocketPoxy G5000. It was my first time using RocketPoxy and I was very happy with it! I did decide to add one layer of Tip-2-Tip carbon. I know it was not needed for these flights, but I figured I could still meet my goal and it would look better to me so that added a bit of unnecessary weight.
Motor retention: I am not a fan of losing casings so I wanted threaded retention to a bulkhead.
Laundry: Topflight 24” ThinMill chute, 10ft of 1000lbs Kevlar, homemade fire blankets, and a bit of dogbarf
Electronics: Featherweight Raven V4, Featherweight GPS, and Jolly Logic Chute Release. The GPS will have a magnetic switch and the Raven ended up with a homemade screw switch.
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