I was talking in a thread about how I had an Oddroc idea. Here is my announcement on our local rocketry forum:
I have no idea why I want to build this rocket so badly, but ever since I saw the Thor scene (spoiler alert!) where Thor's hammer takes off from the ground I have wanted to build a Mjölnir rocket. So that's what I intend on doing. I've done a lot of thinking on it and its time to do some doing. The first thing I want to do is think more, by taking some advice.
I modeled it up in Catia to make sure the dimensions I found online looked okay. Here is what it looks like:
The hammer is 6.5x6.5x11". The chamfers are 45 degree angles, and 1".
The shaft is 2" diameter and 15" long.
I try to do something new every rocket, this time it is making a minimum diameter rocket. I currently plan on epoxying polycarbonate fins onto the shaft. Not sure on that exactly yet, I'll need to do more research. I don't want the fins to be very visible as that will ruin the look I'm going for. The shaft will be where the motor gets placed. Not sure on motor retention yet. I plan on using a motor ejection charge so I don't have to cram avionics in there. I plan on making the entire thing out of fiberglass, and epoxying separate sections of fiberglass together to make the hammer section. This seems like a terrible idea because of how much drag the hammer would create and therefore how strong it would have to be. Someone convince me to do something else!
I plan on epoxying a coupler tube inside the hammer. The booster tube can then be secured to it, and the ejection charge will separate the rocket into two sections. The parachute will be stored in the coupler tube that is inside the hammer.
Another major problem will be the disrupted airflow that the hammer causes. I have no idea if I can get fins big enough to mitigate that problem. Anyone have any insight on that?
Anything else I'm not thinking of in addition to that? Also I tried to find that particular video online but didn't see it, perhaps I can find it later.
Changes in design since then:
3" body tube diameter (hopefully my tiny hands can still grip it like a hammer!)
54 mm MMT
1526K160-6 by CTI is currently the motor choice. I figured a slow burning motor would allow for more airflow to get to the fins, therefore bringing the Cp down.
As of now I plan on having that coupler tube that comes out of the hammer section, and using shear pins to have the separation occur there (although would shear pins even be necessary with all the force acting on it ).
Wide, square polycarbonate fins.
Questions still: Thickness of fiberglass plates for hammer section, and thickness of polycarbonate for fins. Anyone with experience want to guide me?