Jeroen_at_CTI
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- Joined
- Apr 26, 2009
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Instructions for bending the retaining rings: Grab ring at 0.2" (5mm) from end with linesman's pliers and bend inward 90 degrees. Repeat for the other end. The end result should look like this:
View attachment 246942
Jeroen
Instructions for bending the retaining rings: Grab ring at 0.2" (5mm) from end with linesman's pliers and bend inward 90 degrees. Repeat for the other end. The end result should look like this:
View attachment 246942
Jeroen
Did you heat it up or just bend it cold?
Are the rest of us going to be able to buy one or two? I'm not seeing these on the site?
Anyone have an open rocket file? Or rocksim?
If you make one......we will all have one!!! LOL!!!
boat tails are easy...they are simply transitions, fins on boat tails is the hard part. don't know of a work around that will allow an accurate flight simulation.
Rex
Not sure about a rock sim file. I used about 10 feet of 1/4" Kevlar shock cord. Tie a knot in one end and sink that end into the tip of the cone. Then fill the tip of the cone with epoxy enough to cover the knot. For a chute, I would stick with a 12-15"Really happy to find this build thread. I'm one of those lucky soles that threw money at Tim to get my hands on one of these bad boys.
Has anyone generated a Rocksim file for this rocket yet?
What length and size shock cord did you use in the build? How did you affix the shock cord to the nose cone?
Any recommendations on the parachute?
Finally, is there any reason to not construct this in the ziperless style? I recognize that would mean moving the rail buttons forward, which would seem to be a good thing in terms of moving a small amount of weight forward. Did you have to add any nose weight?
I've got an OpenRocket file, but it's pretty useless. The CP/CG is way off. Something to do with the fact that OR doesn't calculate boat-tails well. If you still want it, lemme know.
boat tails are easy...they are simply transitions, fins on boat tails is the hard part. don't know of a work around that will allow an accurate flight simulation.
Rex
The workaround is to use RockSim and not waste your time with open rocket.
I found a crappy file on the web for the Estes V2 (#1926) that needed a lot of corrections, which I did in OR. It's not perfect, but much better than what I started with. The simulation shows apogee at 1420' on an AT F24-7 and my Altimeter2 recorded actual apogee at 1398'. That's about a 1.5% discrepancy. How close is close enough?
Dennis
Tim,
No problem. Here is the file. If anyone knows of anything that I could have done differently, please let me know. I am open to any suggestions to improve my OR
Thanks,
Dennis
Mr Man - have you actually compared any real flight data to Rocksim simulations with boat tail rockets & if so, how did it compare?
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