This is a 2 stage rocket design of my own all made from 3” Blue tube. The First stage booster has two 29 mm engines and the 2nd stage has a 38mm engine. It’s duel deployment running a Raven 3 with a RockeTiltometer , all that in a 3” tube is a lot but can be done by using both sides of the sled. This is quite the most complex rocket by far I’ve built. I’m finding out that Rocksim is having a hard time with the booster. When unloading one engine it still shows me the results as if both were loaded and I can’t get a good feel for what loads would be safe if 1 didn’t light. I Finally decided that I’ll use 2 CTI G250 two grain VMAX motors in the booster and Aerotech H245 in the second stage. I’m going to fly it without the booster first with a I218R to make sure it flies straight and we’ll go from there. Pucker factor should be high!
This is my first flame job and I was very happy with it, not bad to be done with spray can paint! I think it will look really hot on the pad!
Weight Dry W/booster - 86 oz.
Weight Dry W/O booster - 72 oz.
More to come!
| Flight Date: | 2013-08-31 |
| Rocket Name: | 222 (Scratch built 2 stage) |
| Flyer's Name: | Rodney Earp |
| Motors: | 2xG250/2xH242 |
| Expected Altitude: | 2,000 Feet |
| Wind Speed: | 2.00 mph |
| Launch Site: | ROSCO |
| Actual Altitude: | 2,576 Feet |
This was the first flight with the booster. The two G250s fired within millisecends of one another to sent it up to around 200ft. While coosting the booster came off and cleared the main before the H242 fired and went on it's way. I hope the video comes out, it was very hard to video. I launched it 3 times, once with a H112J. All filghts were consistent and stable.
I was very pleased, it did what I wanted it to everytime!
Raven 3 files\2stage 8-31-2013, 2-G250, H242-1.FIPa
Average PreLaunch Altitude (ft) = Val: 39.00
Average PreLaunch Axial (Gs) = Val: 1.16
Average PreLaunch Axial Offset = Val: 1.16
Axial Accel (Gs) = Min: -1.23 Max: 21.77
Baro (Atm) = Min: 0.9090 Max: 0.9986
Current Draw (A) = Min: 0.13 Max: 0.25
Flight Count = Val: 72.00
Lateral Accel (Gs) = Min: -7.82 Max: 10.89
Motor Ignition Time (sec) = Val: 0.168
Temperature (F) = Min: 107.03 Max: 107.25
Time (sec) = Min: 0.000 Max: 14.130
Velocity (Accel-Ft/Sec) = Min: 0 Max: 418
Volts Battery (V) = Min: 8.20 Max: 8.20
Volts Pyro 3rd (V) = Min: 0.00 Max: 0.00
Volts Pyro 4th (V) = Min: 0.00 Max: 3.19
Volts Pyro Apogee (V) = Min: 8.24 Max: 8.24
Volts Pyro Main (V) = Min: 8.24 Max: 8.26
[Altitude (Accel-Ft)] = Min: 0 Max: 2494
[Altitude (Baro-Ft-AGL)] = Min: 1 Max: 2576
[Altitude (Baro-Ft-ASL)] = Min: 40 Max: 2615
[Velocity (Accel-Ft/Sec)] = Min: -38 Max: 410
[Velocity (Accel-MPH)] = Min: -26 Max: 280
| Stage | Motor(s) |
|---|---|
| 1 | 2 x CTI 110G250-14A |
| 2 | 2 x Aerotech H242T |
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