inspired by the A-20 demon

a rocket inspired by the Estes A-20 demon. my first attempt at design file for it(it will need some adjustments). looks like it should fly nicely on 24mm D motors.
Rex

View attachment a-20_demon_inspired.ork

Hi Rex,

Nice looking sim... I created my own sim based on the Demon.



[EDIT] I replaced the image originally in this post with an updated one that has the Semroc BNC-55AM nosecone per Rex R's measurements. Since I don't have a sample of the actual nosecone from Estes, this is the best I can do. The markings are still a best guess [/EDIT]

I'm not 100% on the markings and the nosecone, but I am confident in the body tube lengths and the fin shape. When I get more info on the NC and print up a copy of the decals, I'll see if I can get an updated version uploaded. The black fin is painted per the drawn instructions, not the face card photograph. If you want the face card photo version you'd need to move the LL's 90 degrees clockwise (if the black fin was at 0 degrees, the LL's would be at 225 degrees).

got my order from eRockets and did some measuring, updated file below. the nose is a tad bit more complex than I thought.
Rex

View attachment a-20_demon_inspired_updated.ork

Rex R said:

got my order from eRockets and did some measuring, updated file below. the nose is a tad bit more complex than I thought.
Rex

Click to expand...

Could you post a photo?

give me up to 15min . my internet connection was down so I'm about 15hr.s behind...anywho photo below. have to sand etc.
Rex

Thanks! When I first saw your numbers, I'll admit I thought that it included the length of the shoulder. I'm at school now so I couldn't open the .ork file. I'll update the file when I get home.

Ok... Home now...

Rex, your numbers don't match up...

There must be a shoulder on that cone... I'm guessing it's 1/2" (due to your use of the body tube segment). Can you measure it for me (photo showing it is also helpful).

[EDIT] Ok, now I see that there's a cylindrical section behind the conic section... Still, I need to know how long that shoulder is)

Oh, and what's the part number for the NC? [/EDIT]

Thanks!
Jim

13/16" and 'sem-bnc-55am', cg is 3" from the tip overall length 4.2". chrome monokote was ironed onto the payload tube

Ok... Here we go...

Estes A-20 Demon (K-58) (Clone W/Semroc BNC-55AM Nosecone)


This sim is not intended for giving flight characteristics, it is for building an accurate clone of the original. As such the simulation may not give accurate information on how the rocket would perform in the real world.

The grey bands are meant as simulations of the foil decals, and the black bands represent the waterslide decals (but are best guesses only).

View attachment Estes A-20 Demon (K-58) (Clone with Semroc BNC-55AM nosecone).ork