Activity

I tried a PM but was apparently unsuccessful. I’ll write you an e-mail.Doug

Outstanding, Doug – I’m at john.wilke(at)comcast.net Pardon my typing gymnastics there, I’m trying to avoid the spambots out there…

I have a couple that you may wish to consider using. I can write you off line with possible chutes that may work for you.Doug

Well this was hardly groundbreaking study, and as you note, done at low velocities.But you’ll find I think if you do a thorough search, that the data and general conclusions hold all the way up to transsonic velocities. The absolute…   Read more»

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»

Adrian,I’ve got ellipticals in 25 and 30 mm as well you are welcome to try. Ogives are a fairly sucky Cd. Excellent and simple R/D here//web.syr.edu/~smdemar/rocketdrag.html

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»

JW,Not sure, and not really wanting to rehash a debate here. Warren and I have been there, done that, and like most debates on pointy headed subjects, no real conclusaions reached IMO.I bought a lathe in part to do custom…   Read more»

One question I have for John W is whether Gambit sported a conical nose? :John, Gambit had an Estes body tube. I can’t recall the size, it is whatever is just a sniff bigger than PML 29mm. I remember because…   Read more»

Just wish I had flown my f10 last w/e instead of fussing with the 2 stage flight–weather was great/ One question I have for John W is whether Gambit sported a conical nose? I really don’t want to get into…   Read more»

I will say this: the math (not just in rocksim) I have no doubt though that both the F and G records could be taken with the F10 and G25, though, assuming a near perfect vertical boost..I don’t have my…   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 will say this: the math (not just in rocksim) I have no doubt though that both the F and G records could be taken with the F10 and G25, though, assuming a near perfect vertical boost..I don’t have my…   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»

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»

I will say this: the math (not just in rocksim) certainly supports the notion that the F10 is about the perfect F altitude motor. The difficulty of course lies in getting a good straight boost through all 8 seconds of…   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»

As I said though, if you have a way to deploy with it, you can have my G25-5 for an altitude attempt (I wish I had a G25-15, but the 5 second was hard enough to find as it is)….   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»