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Adrian, Just curious--are you using EAGLE as your layout editor? I spent a good portion of my summer developing some board prototypes with that and thought I recognized the layout style...

Quick model I did in Rocksim, aero analysis done in RASAero (based on that, used a Cd override of 0.26 in the Rocksim simulation--the flight only gets up to ~0.8 Mach, so the constant Cd assumption should be ok. In the ideal case, you're limited slightly by the length of the delay. (Max...

Another question to be asked is whether the 24.5 oz mass spec you're using is from Rocksim directly, or if this is the measured weight of your finished rocket. The adhesives, paint, and occasional misc. hardware that goes into the actual rocket tends to make it a bit heavier than Rocksim's...

https://abcnews.go.com/GMA/video/seals-worlds-1st-stealth-helicopter-13533840

This sounds promising...

In general, the radius is going to be the length of the "arm" you'd use to trace out the nose shape. For a 4" nosecone with a length of 16.5" you would want to use an arm length of 69.06 inches. You can get the math for this starting with the equation of a circle: (x-a)^2 + (y-b)^2 = r^2...

Based on the specs that Semroc gives, BT-30 has a slightly larger I.D. and a slightly thicker (0.021" vs. 0.013") wall thickness. BT-20 has an O.D. of 0.736", and an I.D. of 0.710" BT-30 has an O.D. of 0.767", and an I.D. of 0.725" BT-30 can still be used in 18mm minimum diameter designs, it...

I'll be there competing.

It's actually a new kit, the Astron--it follows the same basic design as the Astro-1/Astro-Jr, but being based on ST-8 tubing with an 18mm motor mount, fills a gap between the 13mm ST-8-based Astro-Jr and the 18mm ST-10-based Astro-1. I believe it was intended to to be the free promotional kit...

As for this, polished is probably as close as anything. I wouldn't worry about it too much; the finish is probably used to some very small degree in calculating the drag coefficient, but really, the difference in frontal area between having fins that are 0.080" thick and 0.085" thick would...

Much of my decision-making process on fin thickness (and probably true for many/most others) is just experience with what works and what does. For very small rockets (13mm motors or lighter-weight rockets on 18mm), 1/16" (0.0625") balsa is usually fine as long as the fins are of a fairly normal...

If you've got a clear view of the horizon in the East-Southeast direction just before sunrise (~4:30-5:30 am) on the morning on June 8th, you should easily be able to see Jupiter, which will be (with the exception of the moon) by far the brightest object in the sky. But if you have a pair of...

The G64 launch photo looks interesting... All of the G64's I've seen have had a well-defined flame and very white smoke. In this case the flame is partially obscured by smoke and the exhaust plume itself seems much darker than normal. It's almost like it had 1 G64W grain and 1 G53FJ. They are...

Boosted darts? Again, it isn't a practical design safety-wise... the mass of the upper stage has been optimized and sized based on it being a solid stick of tungsten. According to RockSim, if it were allowed to recover ballistically it would impact at ~1200 MPH and have ~1.2 megajoules of...

It might not even be all that close, but this should tide you over until Cesaroni releases it in an official update. I based the performance off of the thrust curve shape of the only other 98mm 3G M4770-Vmax, the total impulse off of the ratio between the M4770 and the 3G M1520-BS as compared...

Apogee Components used to sell 10.5mm tubes for their specialized motors back in the day, and they might still sell that tubing, but I know that Semroc now sells BT-4, which has an I.D. of 10.7mm. https://www.semroc.com/Store/Products/BodyTubes.asp

Try this for nose cone shapes 1- best 2- good 3- fair 4- poor From: https://en.wikipedia.org/wiki/Nose_cone_design

Apologies; I don't frequent that site very often so this was the first I'd seen of it.

Just happened upon this video today: Pro98 6G N10,000 Vmax UVaPMWLKOWQ Hmmm.

This article and diagram might be of some use: https://en.wikipedia.org/wiki/Nose_cone_design https://en.wikipedia.org/wiki/File:Nose_cone_drag_comparison.png You won't be able to break mach single-staged on a C6 (you'd probably want a C6-7), but it is certainly possible with a...