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Brazing is almost like soldering but at a bigger scale. Heat both sides to near red, touch the brazing rod to the parts and watch it melt and flow into the joint. Most come with a paste flux on the outside of the brazing rod so the only prep needed is to make sure the joint is very close and clean (...

I know the idea behind the maggie is a weld-less ramjet but have you thought about brazing your flameholder in place? It should hold up better than the epoxy but is still doable with only a propane torch (mapp gas would be better) I would guess thats also the reason that it got quieter as you leaned...

I recall reading somewhere (I don't remember where) but there was a process that would take carbon fiber cloth, form it into the shape you wanted, burn it and then treat it with something (no clue what) that would then strengthen it again. It was now extremely light weight (more so than the carbon f...

High pressure explosions are very dangerous and if not designed carefully, a pressure rocket could be the source of a high pressure explosion. Look back in history at the number of water heater explosions that would almost level a house until laws and codes were written to force a pressure relief va...

Most higher power rocket motors use graphite as the nozzle. It isn't as brittle if held under compression and the thermal properties are just great! If a graphite nozzle gets dropped, its going to chip/crack/shatter, but if handled carefully, it would be fine.

-Aaron

If you've got a drill press, you can get a circle cutter to make any size circle you want. Go to www.mcmaster.com and search on item 3082A2 for holes up to 7 7/8th inches wide.

Also, you can use other types of hole cutters like item numbers 4008A68 and 4066A75

-Aaron

I have that exact pump. It will output 65 PSI in a closed water circuit (water in a line connected to a 100 PSI water pressure gague) on a full 12VDC source (12VDC 50A battery). It's not small, nor very light, but the thing is actually very powerful for the price. I use it to pump kerosene and it ha...

You can then use a ball-type valve that is connected to a servo. The servo and controller can be obtained from most R/C locations. Something else you would want to add to the fuel line would be a solenoid as a main fuel cut-off because most of the servos have a slow response time when it comes to th...

Land (and hence the crops) is cheap out in the middle of nowhere. 1/4 acre (all that would be needed for a windmill) would be less than $1000 per year. Most of the farms have access roads already. Place the windmill just off the access road. No additional land lost to add them. The biggest issue is ...

One thing to keep in mind when comparing hydrogen and gasoline (or any of the petro-chems used as fuel) is that hydrogen is very light and will go up into the atmosphere very quickly. Contrast that to gasoline that is heavier than air and will pool near the ground. Hydrogen will burn very quickly in...

Out here in the midwest in the USA, I think would could give up a few hundred square feet for the post of one of those big wind turbines. We have huge (and I mean HUGE) tracks of land that are being used to grow all types of crops and we get a good amount of wind as well. Crops will grow under the w...

I see no benefit to placing it any further aft from the defuser as you will not get any more pressure change without changing the shape of the combustion chamber (at which point, it is a defuser again and no longer the combustion chamber) My opinion is to place it fairly close to the forward end of ...

Decker's ramjet design should work for you if built exactly as designed. If you want to change scales (make it larger or smaller) then you can't use his formulas as there are problems. In another post, I corrected all his formulas so that it could be scaled up or down as desired. Depending on the ma...

Looks like they took the thrust vectoring nozzles from the newer jets and applied the same principal to solid rocket motors. Very interesting and the possibilities are staggering.

-Aaron

It was a paper written by a naval student and not by me and so I don't have any results to give. You might try sending a request to the US Navy and ask if they have results from this thesis that they could share as they probably own all the information generated from a thesis by a Naval student. Wis...