Project Lila is an LPR with folded cardstock fins. The build is simple, you should have most of what you need in your parts pile.
Project Lila
- Thread starter Cape Byron
- Start date
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This is a very rough .ORK which approximates the area of the cardstock fins. It's not a substitute for a good old fashioned swing test.
Hopefully someone will run up a better simulation with a newer version of Open Rocket than the one I am using.
Hopefully someone will run up a better simulation with a newer version of Open Rocket than the one I am using.
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Instructions and Metric prints.
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Instructions and imperial prints.
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Any questions please ask. I'll do my best to answer them. 
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Bookmarked, thanks!
I would screw that one up royally trying to build that. 
I would screw that one up royally trying to build that.
No, you wouldn't. It's actually a really easy build.
Do it. You know you want to.
SVG file (Inkscape will load it) of the fin design. Change colour of whatever to suit your own thoughts.
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- Joined
- Oct 8, 2016
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Awesome!!! Thank you so much for making this rocket a free download. I know it took a good amount of effort, time and some money to produce Lila. I really do appreciate your willingness to share.
Playful, sporty, without fins. Yes Mr .RSO, base drag is my friend.
Thank you. She needs to be shared. I want people, our group, to make the design better than it is.
Playful, sporty, without fins. Yes Mr .RSO, base drag is my friend.
The Doctor said, "They're fins, Jim, but not as you know it."
I'm just a country oddroc builder, not some sort of fancy rocket scientist!
It will take a miracle worker to make it stable.
Scotty, I need a bigger motor, more power!
I was going to fly it this morning at a park launch but the glue on the launch lugs weren't quite dry.
Used holographic adhesive wrap and a weighted balsa nose cone cuz that's what I had on hand.
Added an engine hook.
![0513231627[1].jpg](https://cdn.imagearchive.com/rocketryforum/data/attachments/497/497326-b000f27851a5c3d2f888e0918a8c26c9.jpg "0513231627[1].jpg")
We have another launch next weekend at the local community college.
Will try to send her up then, weather permitting.
![0513231626[1].jpg](https://cdn.imagearchive.com/rocketryforum/data/attachments/497/497327-37103392241c81296572cfdd181301ff.jpg "0513231626[1].jpg")
I built this stock per the instructions but was wondering about the placement of the lugs.
Mal, could the lugs be put further back on the tube?
Instructions have them 17 and 30 cm from the back end.
That places the bottom lug around mid center and the forward lug near the top end of the tube.
Laters.
Used holographic adhesive wrap and a weighted balsa nose cone cuz that's what I had on hand.
Added an engine hook.
We have another launch next weekend at the local community college.
Will try to send her up then, weather permitting.
I built this stock per the instructions but was wondering about the placement of the lugs.
Mal, could the lugs be put further back on the tube?
Instructions have them 17 and 30 cm from the back end.
That places the bottom lug around mid center and the forward lug near the top end of the tube.
Laters.
My placement was based on nothing at all really. As long as you are above the fins and span the CG it should be fine.
Nice build. Any problems?
No problems.
The fin templates and paint mask are perfectly sized.
I didn't need to use the fin guides because the cutouts for the paint mask mark the locations for the fins.
However I did print the paint mask on the back of the wrap (on the backing paper).
Then cut it out and wrapped it around the body tube.
Worked perfectly, and no painting.
Oh, and didn't have 140# cardstock so used 110#.
The fin templates and paint mask are perfectly sized.
I didn't need to use the fin guides because the cutouts for the paint mask mark the locations for the fins.
However I did print the paint mask on the back of the wrap (on the backing paper).
Then cut it out and wrapped it around the body tube.
Worked perfectly, and no painting.
Oh, and didn't have 140# cardstock so used 110#.
No painting is a big bonus!
So, have you flung it into the air yet?
Nice one Mal.
Thanks for sharing.
Cheers,
Mark
Thanks for sharing.
Cheers,
Mark
Flew straight for about 50 ft. then she skywrote.
I think my mistake was using a balsa nose cone and putting the washers on the shoulder.
Instead of a longer plastic nose cone with the weight at the tip.
Will modify and try again.
What motor?
Would be a good idea to edit the ORK file and override the CG position in the sustainer and for all subcomponents to a point where you know it has been flown and was stable. But remember that the cg will still change in the sim once you load a motor, which is not the position you want. My brain hurts, someone smart should figure out how to convey this.....
B6-4 IIRC.
I think it's marginally stable, just needs either a little more nose weight or move it up a little further.
Best I can come up with is a 0g mass called C.G. at the desired CG position. This won't move.... now to work the magic and make this a thing we'll need @K'Tesh to make it pretty. OR can then continue to do it's thing and give you the simulated CG. With the mass object showing the desired cg for a known working flight profile.
Nice work. All input to this design is welcomed. After all, it’s a communal project now.
Hey Mal,
Can you swing test it and give me a CG working test point?
Yep. Give me a minute to finish this beer.
Okay, with a C6-5 it’s 27.4 cm.
OR file updated with target CG from swing test done by Cape Byron shown as dummy mass object.
