Sometimes I think that sugar rockets are viewed by some as just a 'play toy' that 'kewl dudes' muck around with. Back to top 16 dagabu dagabu Grandmaster. Yes, you can easily lift a 2" shell with a 3. Using a core burner, you should be able to lift a LOT more, we have seen independent testing with special pyrotechnic propellants hit just shy of of pressure on the ACME test stand. Theoretically should lift an 8" shell to height. Back to KNSU motors: A de Laval styled nozzle does indeed make for a pretty flame but the lack of shock diamonds is a clear indicator that there is no significant increase in thrust since the entirety of the burn remains subsonic.
The problem with both BP and KNSU and other R-Candy motors is that the gasses just don't have the velocity to take advantage of the nozzle configuration over time and even though the flow MAY hit a velocity that can take some advantage of the divergence, what happens most of the time is detrimental to the actual thrust and can actually choke the thrust. The VERY basic drawing below shows what happens with various gas flow rates. Posted 22 December - PM. Some ti e ago there was a really god analyses about these here, but i can't find it at the moment, but in the resukt was, the covergent part can actually increase thrust a divergent is more likely to reduce it or make no difference.
The reason for this is, that the pressures in bp rockets are jus too small. I sort of remember some of that, now that you mention it. It all passed right over my head, and, not being that much of a rocketman, i prefer mortars, i guess i didn't pay enough attention. U mad bro? No, this can't be allowed. You have to make some flash jokes first, threatening to blow your self, or the neighbors dogs to bits, and then we can get to the mundane rocketry.
If under or overexpanded then loss of efficiency occurs. Grossly overexpanded nozzles lose less efficiency, but can cause mechanical problems with the nozzle. However, slightly overexpanded nozzles will produce more thrust than critically expanded nozzles if boundary layer separation does not occur.
Rockets become progressively more underexpanded as they gain altitude. Note that almost all rocket engines will be momentarily grossly overexpanded during startup in an atmosphere. This relationship to altitude, is it due to atmospheric pressure?
Does the area of the burn play in at all? I have a feeling the answer is yes, but i'd rather ask and look stupid, then not to ask, and remain stupid. Larger area of the burn means higher rate of gas production, well until it cant burn due to pressure. Do we? Schroedinger says it better than I but yes, there is a direct correlation between the area and the optimum thrust. With liquids, the thrust remains the same, with solids, you can change the shape of the bell in flight to make up for losses.
No we won't reach that point, the two main reasons for that are that we deliver the fuel and oxigen ourself, which means we don't depend on atmoshpheric oxigen and the pressure actually increases the reaction speed.
Due to these facts we rather blow up our casing then stop the reaction. Keep in mind that liquid fuels also deliver oxygen to the reaction as well and do not depend on atmospheric oxygen. Community Forum Software by IP. Sign In Create Account. Javascript Disabled Detected You currently have javascript disabled. Water putty rocket nozzles Started by yoyo , Dec 19 PM. Page 1 of 2 1 2 Next.
Posted 19 December - PM Hello, For anyone who uses Rockite, Durham's water putty, or some other variant for rocket nozzles, how do you make them properly symmetrical and straight? Any suggestions would be appreciated. Posted 19 December - PM Yoyo, you probably need to make some sort of tooling or jig to hold everything in place.
You use a "cake mold"!! What size motors are you making? Posted 19 December - PM When I use Durhams to make rocket nozzles, I just dampen it slightly and press a nozzle using a standard spindle and rammer just like when I use clay.
Kurt Actually that address puts you right onto the page you need to be on. Edited by uncrichie, 20 December - PM. Posted 20 December - PM Thanks for the info uncrichie.
Posted 20 December - PM Great idea stix! Posted 21 December - AM Great idea stix! Posted 21 December - AM I only made this jig as an exercise in jig-making.
Posted 21 December - PM That is quite a nice jig, definitely on my things to do list. Posted 21 December - PM B! The relly intresting part is the covergent part tapered rammer. But there is a 2nd reason to use a tapered rammer, specially with endburners.
The cavity directs the flame towards the nozzle hole away from the tube. If you use a flat rammer the flame isn't directed away and always hits the wall and this can result in burn through. If this happens a end burner will lose all his thrust way to early. A core burner is of course less likely to have this problem as it burns up the thrust fuel within a second but still the delay is able to burn through the wall. About the divergent part, it is also interesting to have, since it is an easy way to increase the touching surface between the nozzle and tube without creating a too long straight channel inside the nozzle.
This point is specially interesting if you are going for the highest power possible, as it reduces the risk of a blown out nozzle In the end its again nice to have and the other one won't hurt to much. Posted 22 December - AM I agree that the convergent section is absolutely very important to the performance of the nozzle in regard to the flow of hot gasses. Here it is: Convergent Tooling2. This is a static firing test of one of my experimental nozzles: Skint Max Thrust.
Surely that's not asking for too much? If the pressure of the exhaust jet varies from atmospheric pressure, nozzles can be said to be top to bottom :. To unlock the new abilities you must first have the desired unit at level two. That alone can be very time consuming, unless you have already upgraded them.
Each upgrade strengthens the ability. With the addition of the new aerial healing unit, the Zafreeti, anti-air defenses are needed. Without these new towers your only defense for air units are Tesla Towers.
Those towers will be quickly targeted and taken out, leaving you defenseless as the healing power of the Zafreeti is massive. Positioning of these towers are vital. You want them to cover your important buildings, such as your silos, harvesters, and your Town Hall. I would advise upgrading the Aerial Defense Tower as quickly as possible before people take advantage of the new Zafreeti unit. The cost to build it is , twigs, , pebbles, 62, putty. The building time is five hours, this is good as the amount of time to unlock the Zafreeti or the Tertorn are much longer.
The first upgrade allows it to teleport a distance of , allowing it to reach buildings that much faster. Before, the Bolt was not used very often, but with this new upgrade, you may find people using them against you more often.
In my opinion, even with the upgrade, this unit is still not worth the resources required to build them. This ability causes the unit to spin, dealing damage to units in a small area around it. The ability only triggers when used against other monsters, it does not trigger when used against buildings. Filling your Monster Bunker with these once they are upgraded is one viable defensive option. A few of these can quickly destroy certain defensive units used in bunkers. The downside to the unit is that it is slow.
If you decide to fill you Monster Bunkers with these units, it will take awhile for the unit to reach the invading force.
The new ability for the Brain unit is invisibility. This ability allows the Brain to avoid attacks from towers for a short period of time. The further the ability is researched, the longer the invisibility will last.
This is another great way to attacks for resources. Beware, the Brain is still susceptible to land mines. For defensive purposes, it would be wise to carefully pick the locations of your land mines.
Putting them around harvesters and silos would be the best option. Overall, this ability is definitely worth the cost and time to train. Report Vandalizer. Blogs News. Base Defense Guide Bombs. Explore Wikis Community Central. Register Don't have an account? View source. History Talk 0. Monsters and Champions.
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