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: | 2013-08-24 |
| Rocket Name: | 222 (Scratch built 2 stage) |
| Flyer's Name: | Rodney Earp |
| Motors: | H242 |
| Expected Altitude: | 1,300.00 Feet |
| Wind Speed: | 10.00 mph |
| Launch Site: | RDRC |
| Actual Altitude: | 1,030.00 Feet |
This was a test flight just to make sure the rocket was stable. Looking at the video the Aerotech H242 launched it off the rail at a very good speed, even with a 10mph wind. It didn't go as high as it Simed but we did lean into the wind at about a 10deg angle so the wind could have played a big part in the low altitude. I also did a small test with the Roocketiltmeter and log said eveything worked and fired the secend stage igniter, but it don't seem to be burned. got a mystery to work on.
Update: My mystery was not a big one. the 9v battery that fires the igniter was a little less than 9v, it was 3.4v. Didn't think that a few test would have run it down so far. I'll need to check before each flight and maybe even replace. I've read about the plates of the battery getting missed up during high G launches.
The graf and summary from the Raven 3 is below. Next with the booster on 2 CTI G250
\Raven 3 files\2 Stage flight 1 wo booster.FIPa
Average PreLaunch Altitude (ft) = Val: 32.00
Average PreLaunch Axial (Gs) = Val: 1.04
Average PreLaunch Axial Offset = Val: 1.04
Axial Accel (Gs) = Min: -0.55 Max: 11.34
Baro (Atm) = Min: 0.9621 Max: 0.9988
Current Draw (A) = Min: 0.13 Max: 0.13
Flight Count = Val: 66.00
Lateral Accel (Gs) = Min: -0.88 Max: 1.12
Motor Ignition Time (sec) = Val: 0.155
Temperature (F) = Min: 83.27 Max: 83.40
Time (sec) = Min: 0.000 Max: 9.030
Velocity (Accel-Ft/Sec) = Min: 0 Max: 275
Volts Battery (V) = Min: 8.24 Max: 8.26
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: 8.28 Max: 8.30
Volts Pyro Main (V) = Min: 8.32 Max: 8.32
[Altitude (Accel-Ft)] = Min: 0 Max: 1062
[Altitude (Baro-Ft-AGL)] = Min: 2 Max: 1033
[Altitude (Baro-Ft-ASL)] = Min: 34 Max: 1065
[Velocity (Accel-Ft/Sec)] = Min: -35 Max: 272
[Velocity (Accel-MPH)] = Min: -24 Max: 185
| Stage | Motor(s) |
|---|---|
| 1 | Aerotech H242T |
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