Search results

Just a thought, but could it be a separation between the bottom of the propellant grain and the top end of the nozzle, causing the failures? Think about it, if there was a crack to develop there it would expose a lot more surface area to the flame front. This would cause a pressure spike and...

Does it say the entire rocket must use helicopter recovery? Or just the nose cone and payload. You might want to look at the Estes "Sky Twister" design. If i recall correctly it's a BT-56 based rocket, which is just every so slightly larger than Bt-55. Anyway, you should be able to fit a 29mm...

Speaking to the pressure produced on burn through of a BP motor, Estes once produced a model named "Cato". As the name suggests, it was designed to simulate an engine failure. Anyway, it flew on a C6-0 and the pressure released at burn through actuated a piston attached to a dowel which attached...

If you're going to use ducted fans as a recovery deivce, what about the idea of using them as reverse thrusters? There used to be a kit from heavenly hobbies that used an engine mounted in the nose as a "retro rocket". I would think that ducted fans would be an even more effective and controlled...

The Pentium was a 586 of the fifth generation of intels x86 architecture. The Pentium Pro was actually a 686 or the sixth generation. The Pentium II and III were 6th generation as well. Anyway, that's likely the meaning behind the name "Quad 6" and likewise "6X6".

So, what's the final say on boosters? It's rather confusing because first we were told 8 months and now it seems to be 6 months? I got my second shot the first week of april, so if it's 6 months, I'd be due pretty soon? Also, are these only for people who got the Pfizer shot? I got the Pfizer...

If JB weld if filled with iron, which is a ferrous metal, encapsulation conductors or electronics in it would definitely have an effect on inductive reactance. So, any RF or signals with AC components could certainly be affected. You also have to remember a simple multimeter is using a DC...

Hi Chuck. I just saw the president on TV talking about the boosters. My question is what's the specific reason for the boosters being exactly 8 months after the second dose? Are there studies showing that 8 months is the point immunity starts to wane? Would there be a down side to someone...

I would think that bringing back the C5-0 would be a great idea. I understand that they probably don't want to make too many different types of motors. However, what they could do is simply replace the C6-0 with the C5-0. Any rocket that could use a C6-0, could likely use the C5-0 just as easily...

Most composite motors are core burning motors and need to be lit at the top of the grain to ensure the full length of the core ignites early and builds up pressure properly. At the top of the core should be the delay grain and in these motors the delay grain is designed to light when the motor...

A while back I watched some videos on youtube regarding subject matter along these lines. As for vacuum versus pressure, the general consensus seem to be that for infusing porous materials like wood vacuum was used. The use of vacuum helped infuse more resin into the wood by pulling out air, but...

No doubt, it's likely true the booster motors don't develop as much pressure as a normal ejection charge, but they still develop a fairly substantial amount of pressure. Check out the Estes Cato that used a C6-0. The pressure developed when the C6-0 burnt through was enough to actuate a piston...

I guess that correlates with this study. https://www.nih.gov/news-events/nih-research-matters/immune-cells-common-cold-may-recognize-sars-cov-2 It found that blood samples taken before the pandemic had immune cells that showed reactivity to SARS-CoV-2 and those cells seemed to be memory cells...

Speaking of T cell immunity, here's something I found somewhat interesting. https://www.nih.gov/news-events/nih-research-matters/immune-cells-common-cold-may-recognize-sars-cov-2 It's a study where they found some memory cells from past infections of common cold corona viruses seem to...

That's interesting. Are there any studies being done into whether ACE inhibitors or ARBs might be useful in reducing or preventing this damage?

That sounds very interesting. Would that also possibly be useful in treating other viruses besides Covid? For example would it be useful for thing like Ebola which have much higher fatality rates?

Yeah, if arcs can be used to weld and cut steel, surely they could be used to ignite a propellant grain. Perhaps a good starting point would be to look at the design of TIG welders or plasma cutters. Also the grain of a black powder motor should be somewhat conductive since it contains carbon.

Would an ARC not also generate free radicals and ozone? Would that perhaps also make ignition quicker?

Lee Dexter still sells both the micro and mini hybrids. You have to contact him via email and he responds with information on how to order. The Micro uses the 8 grams cylinders. The mini uses the larger 16 gram cylinders. See post number 37 in this thread...

Does Warfarin work against this mechanism?