Adrian

Hmm.. I couldn’t find anything about altimeters anywhere on the site. But I’ll contact one of their people to see what’s required.

Thanks for the link. The wind velocity was so low, though, that I’m not sure how relevant it is for F or G records. Maybe if they had used much larger models to get a better match with the Reynold’s…   Read more»

It would be interesting to swap back and forth on a High perf supersonic bird to see what gives.Yeah, Chris got some good data on his Cd as a function of velocity. It would be really interesting to see the…   Read more»

When I recovered, I found it was not even on the same page as the sim… Yes, the date would be particularly interesting. Maybe you were using an older version of Rocksim at the time that didn’t model transonic drag…   Read more»

I don’t want this to come out wrong and I don’t want this to come out smarmy (that was a disclaimer) but simulating something and flying it are two totally different animals. The TRA “F” record hasn’t stood for as…   Read more»

One way to think about it is terms of a work function. Work against gravity is constant depending only on the endpoints, while work on drag is not a state function, (in math speak, instead its a line integra) that…   Read more»

By the way Adrian, put me down for one of those altimeters when you’ve got one that will do at least Apogee deployment. Without electronic deployment, you really can’t optimize for altitude.Grr. Bill, you got me thinking, which is a…   Read more»

I’d be interested in seeing that if you could bring it to the next launch.I could drive they keying with the spare switched output on the Parrot, but then it wouldn’t be a factory-standard altimeter. I would also have trouble…   Read more»

As to the 90 percent point, (at least with F and above) I would have to opine that would be sometime during descent after the recovery device has deployed and someone has seen it recently or they have a radio…   Read more»

What’s flight weight? How much do you expect to charge for them? The last time I weighed one with an accurate scale, it was 7.6 grams, but that was my first prototype. Since then, I’ve added some components, including a…   Read more»

Oddly enough, I have not flown an A, B, C, or D motor in perhaps 15 years. On top of that, I have never once flown an E. Given my geographical constraints, mayhaps I will revisit that whole paradigm (hey,…   Read more»

Let me say up front, before I’m tempted to talk any trash, that I really respect what you guys have done, both in the area of records (John’s G record bird is (was? :() a thing of beauty) and more…   Read more»

I suppose I should be asking Tom Rouse this, but do you think that the ejection charge reduction/elimination would disqualify a Tripoli attempt? When I go for the F record I want to make sure I tag all the bases.

I have some questions about record rules:Is a “boosted dart” an unpowered payload section that recovers separately from the booster? I checked out the Tripoli rules and boosted darts aren’t disallowed from single-motor records, though they are disallowed from the…   Read more»

Well, one of the reasons for no SSS attempts on Saturday was that Tim was out of the G80s. Hopefully he can bring some more for the September launch and the October launch, because I’d sure like to go for…   Read more»

I needed a small amount of lead shot, and I also didn’t want to buy a huge bag of it, so I bought a box of shotgun shells and cut them open. Then I learned about tungsten powder and that’s…   Read more»