EeebeeE
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- Aug 7, 2011
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Well. it's been a while since I posted on this project. Other things to do like take a trip to Nebraska to see the total eclipse ... Awesome. I also worked on a design for an 8x Upscale Alpha. But it's time to get back on this. There had been some discussion about skipping Re and going to Mi, but I decided to stick to my original plan. My hope is to take this to Argonia, KS in the summer of 2018.
I opted to go with the Complex K rocket, which is the "Re" design. It will be named "The Golden Sundrop." Ordered parts from Madcow over the weekend and took advantage of the 25% off Black Friday sales. This will also be thin-wall filament wound FG. Sustainer has a 38mm airframe with a 5:1 VK Nose Cone. I bought a 54mm 5:1 Ogive nose cone that I will cut for the transition. Fins will be tip to tip FG.
There are 3-4 motor combinations that all get me north of 40,000 feet in RAS Aero sims. I'd like for it to break Mach 2, but stay under Mach 2.4. Fiberglass can survive about Mach 2.5 but after that you start to stretch your luck. The least damaging flight is a K400 booster and a J150 sustainer. The flight of Do had a 3-second delay between separation and booster ignition. This will have a much longer delay. That gets me a lot more altitude.
This will also need added electronics. It will need a GPS Altimeter, and I think I will use a BRB 70 cm GPS transmitter. I can connect it to a computer or cell phone and use Google Earth to track it. Thought about the Kate system but it is extremely pricey, and with so many people using it, it is starting to get annoying. I will again use the Raven Altimeter to control deployment. It has a number of safety features in it that prevents ignition of the sustainer if it is not ascending or pointed the right direction.
This rocket will separate via a timer in the booster stage instead of with the Raven in the sustainer. I will also need a tracker in the booster since it will go a lot higher. I think I will use a 2-event timer to do separation, then main chute deployment. The Motor charge can do the booster apogee deployment.
The fins are also a little larger giving this a lot more stability. The sustainer fins are about 1.2x the airframe diameter and the booster fins are about 1.1x.
The biggest issue I have is deployment at apogee. Most would say that BP deployment at 40,000' is not advisable, but I have not seen any CO2 systems that go into an airframe smaller than 54mm. My sustainer will be 38mm. Thoughts I have are 1 - using BP but increasing the amount of powder to 4x what is needed so that the powder that actually burns will be sufficient. or 2 - With the Raven not needing to separate, I can add a second charge that would fire as a backup at 20,000' where BP is more effective. I would need a much longer shock cord and a streamer to slow it down.
Here is the most current design. Feedback is welcome.
I opted to go with the Complex K rocket, which is the "Re" design. It will be named "The Golden Sundrop." Ordered parts from Madcow over the weekend and took advantage of the 25% off Black Friday sales. This will also be thin-wall filament wound FG. Sustainer has a 38mm airframe with a 5:1 VK Nose Cone. I bought a 54mm 5:1 Ogive nose cone that I will cut for the transition. Fins will be tip to tip FG.
There are 3-4 motor combinations that all get me north of 40,000 feet in RAS Aero sims. I'd like for it to break Mach 2, but stay under Mach 2.4. Fiberglass can survive about Mach 2.5 but after that you start to stretch your luck. The least damaging flight is a K400 booster and a J150 sustainer. The flight of Do had a 3-second delay between separation and booster ignition. This will have a much longer delay. That gets me a lot more altitude.
This will also need added electronics. It will need a GPS Altimeter, and I think I will use a BRB 70 cm GPS transmitter. I can connect it to a computer or cell phone and use Google Earth to track it. Thought about the Kate system but it is extremely pricey, and with so many people using it, it is starting to get annoying. I will again use the Raven Altimeter to control deployment. It has a number of safety features in it that prevents ignition of the sustainer if it is not ascending or pointed the right direction.
This rocket will separate via a timer in the booster stage instead of with the Raven in the sustainer. I will also need a tracker in the booster since it will go a lot higher. I think I will use a 2-event timer to do separation, then main chute deployment. The Motor charge can do the booster apogee deployment.
The fins are also a little larger giving this a lot more stability. The sustainer fins are about 1.2x the airframe diameter and the booster fins are about 1.1x.
The biggest issue I have is deployment at apogee. Most would say that BP deployment at 40,000' is not advisable, but I have not seen any CO2 systems that go into an airframe smaller than 54mm. My sustainer will be 38mm. Thoughts I have are 1 - using BP but increasing the amount of powder to 4x what is needed so that the powder that actually burns will be sufficient. or 2 - With the Raven not needing to separate, I can add a second charge that would fire as a backup at 20,000' where BP is more effective. I would need a much longer shock cord and a streamer to slow it down.
Here is the most current design. Feedback is welcome.