Adrian

Yeah, but first you’d have to train it Actually, Robert deHate (picoalt guy) says he’s made one like that. I don’t know the details, though.

This maybe a little off topic maybe not. I dont totaly have a clear picture of accelorometers. The fellow I was talking about earlier Used them to measure a flight from Boulder Airport and track Roll, pitch, direction of travel…   Read more»

Do you actually get data back from the accelerameters? Yes, the axial and lateral accelerations are recorded 200 times per second, and the pressure, battery voltage, temperature, and sensor reference voltage are recorded at 50 times per second. All the…   Read more»

Scott,The Parrot has both a barometric sensor and an accelerometer. The barometric sensor, despite the issues you bring up, is going to be the most accurate, since it’s not dependent on the flight path angle from weathercocking. Also, the accelerometers…   Read more»

Warren,As far as I know, the only certification test performed by Tripoli was to review my published specs and make sure that I really was selling them as a commercial venture, and not just between friends. I offered to provide…   Read more»

This is a great site, Warren, and I’m glad you’re putting in so much effort to keep it up and improve it.And of course, we’re never chatty…

Thanks, John.I was pleasantly surprised, –completely shocked, really– when I saw that there, because ddmobley didn’t tell me he was going to run the story. The quotes were pretty much taken from the website and user’s manual. Web traffic and…   Read more»

A delayed Tim is better than no Tim. Light a fire and make some hot chocolate to enjoy the day!I should have listened to Dave2, also.You know it’s going to be a bad day of rocketry when:You go to look…   Read more»

I’ll be there tomorrow, and I’ll bring some Parrots.

Scott, if all you need for your altimeter is apogee deploy, I can provide a Parrot altimeter and battery which can fit anywhere. And you would get cool 200 Hz 2-axis accel data for your flight as a bonus. :DI’m…   Read more»

I’m planning a dual-deploy setup with a small avionics bay as the coupler between the booster section and the top (main chute) section. I was planning to attach the coupler section permanently to the top section, which will also protect…   Read more»

With regards to the strange pressure effects on boost, where was/were your vent(s)? That could have a huge effect on the pressure readings…The vents were just ahead of the front edge of the motor, which put them just behind the…   Read more»

Well, I still haven’t heard back from Tom Rouse recently. Anyone have a suggestion?

Thanks for the launch log update, Warren. But another reason for not putting it down as a record is that I didn’t safely recover the rocket, only the nosecone. :(I actually printed out and brought a Tripoli record form with…   Read more»

I filtered the accel data with a simple moving-window average before using it to calculate the Cd. I think you’re right that the lighter rocket and lower altitude would help also.In the analysis I’m also propagating the vertical and horizontal…   Read more»

I put in the density calculation into my post-flight analysis, and got the following plot of Cd as a function of velocity:This is the same basic shape of the curve as predicted by Rocksim. Tonight I may try to see…   Read more»

My first estimate of 0.25 came from the accelerometer measurements during the coast. I went to Rocksim to compare, and Rocksim predicts 0.28 at 500 mph. Then I realized that I assumed a 5400 foot ASL density for the whole…   Read more»

Yes, the on-board switch is rated for 4A continuous. But it also depends on what battery you use for the deployment; deployments require a separate battery from the Parrot’s on-board battery. I have been using the same-size (65 mAhr) Li-poly…   Read more»

I assume you’re talking about a 29mm bird flying on an Apogee F10? If so, I have to admit some skepticism about that altitude.While the F10 is nearly a 100% F motor, that altitude is well beyond any current F…   Read more»

The kids won’t be with me tomorrow, so I’ll have some time aside from chasing down an F record attempt. I’d go for some LCO duty, but I’ve been having too much fun with LPR and MPR to get around…   Read more»