The framed fins look neat. How long would a BT-55 or BT-60 based rocket have to be to be stable with that type of fin design?

Since I used ST-8 for this design, let's use ST-16 for the upscale. This makes the scale 1.8X.

Nose Cone = 8.5"
Main Body Tube = 28.8"

I'd suggest a 24mm mount for this one...

Fin patterns attached below.

Attached Thumbnails

   

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Wow nice, could you explain the fins, what's with the lines on the first pic on the fins?

Aero,

(sedate British accent) "Those are the bits that you cut *out.*"


Cheerio,

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Jay Goemmer
"Centuri Guy"/"Tau Zero"
YORF Member 28
Semroc SAM #0029
NAR 86131


"I think about organizing things all the time. Never seems to happen. I find something that piques my interest and I'm off on a quest. Or a Centuri. "

--Bill Eichelberger, 02/22/2022


“Centuri fret buzz in an updated form.”
Bill “Wallyum” Eichelberger re: Estes Flutter-By
03 Sept 2014

Aero,

Jay said it quite well, it represents areas of the fin that are "hollow", and which are either removed from a solid sheet, or give the outline for a multi-piece glue-up structure. In RockSim, you have to work with a single, closed loop outline for the fin, so in order to "remove" those open areas, I have to "break" the outer edges in places. Imagine it as a continuous loop of string, and you're working it around a pattern of pins...

This is part of an on-going series of "open-frame fin" designs to see what the limitations of RockSim really are. There are other things we can't do, but we can still be creative with the program.

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Well, at least not *legally.*


Cheers,

__________________
Jay Goemmer
"Centuri Guy"/"Tau Zero"
YORF Member 28
Semroc SAM #0029
NAR 86131


"I think about organizing things all the time. Never seems to happen. I find something that piques my interest and I'm off on a quest. Or a Centuri. "

--Bill Eichelberger, 02/22/2022


“Centuri fret buzz in an updated form.”
Bill “Wallyum” Eichelberger re: Estes Flutter-By
03 Sept 2014

I see, that's interesting.

Here is a new design I call the Starlight 7. I seem to remind me of some vintage/ classic design but I can't recall it. This one also qualifies as a park flier as well.

Lately I have been building rockets, in particular the Neptune Lander and an Experimantal design I am now calling the Tri- Magnum. Yes, my Semroc order came in two days and I decided to build some of these Rocksim design and see how good the program is. So far the best advantage to Rocksim is making changes as you go while building and see how they affect the design in Rocksim before you do the changes. I Plan on doing a build thread or two if the test flights work out well.

PS. Can someone let me know the best size and file type to post photo's for a build thread???

Thanks Again and Enjoy, JP

James Pierson
NAR# 77907

Attached Thumbnails

 

Attached Files

Starlight 7.rkt (43.0 KB, 106 views)

James,

I generally try to keep my images at 300 DPI, although RockSim tends to save its images at ~72 DPI. For archiving images, I like TIF format because it doesn't drop too much data. But for posting to the forum, you probably would want to stay with JPG as it keeps the final file size down. JPG format drops a lot of data, depending on the compression rate, which is why I use TIF for archiving.

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If this seems like another variation of a 4FNC with just enough difference not to be, then that's what it is...

I'm at a low point in ideas right now, so just think of this one as my attempt to keep my hand in the game. My model-building concentration has been on finishing up a bunch of models that have been sitting idle for way too long. Trying to create new projects to stack up isn't high on the list...

But as I've said before, I think these simple designs are what get flown more often, so I have to put one or two out there for the simple pleasure of building and flying. It's not made of plastic, at any rate, and it's not an ARF or RTF...

Length: 22.8"
Fin Span: 6.1"
Diameter: 1.04" (ST-10)
Weight: 1.43 oz

A8-3......182'......8 FPS
B4-4......418'......5 FPS
B6-4......424'......2 FPS
C6-5......883'......7 FPS

All motors reach flight V in the length of a standard rod.

Enjoy!

Attached Thumbnails

   

Attached Files

Rangefinder.rkt (61.2 KB, 95 views)

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SAM 0044
AMA 352635