I have a challenge to the CAD pros. Who can make a cad or STL file of this? I have challenge my done to make one.
CAD Software Challenge to the CAD Pros out there
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dr wogz
Fly caster
I vaguely remember this!
if I recall, it was about 3' tall, and had a 38mm motor mount, and survived the swing test! it was pink foam board all tuned & shaped.. 3/8" or 1/2" plywood fins, and lotsa fiberglass!!
I will further the challenge:
To make this in the smallest number of steps / features.. (how small will your 'model tree' be?!)
if I recall, it was about 3' tall, and had a 38mm motor mount, and survived the swing test! it was pink foam board all tuned & shaped.. 3/8" or 1/2" plywood fins, and lotsa fiberglass!!
I will further the challenge:
To make this in the smallest number of steps / features.. (how small will your 'model tree' be?!)
boatgeek
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I see 10 surfaces in the fins. You'd array that for the full fin set, not sure if that counts as 30 parts or 10. Alternatively, you could make the fins out of three extruded solids stacked together if you count a solid as a single piece. That would be 3 or 9 parts once you arrayed the fins.I will further the challenge:
To make this in the smallest number of steps / features.. (how small will your 'model tree' be?!)
I'd make the body tube out a single part--draw a line and then do a body of revolution on it. So that makes 4, 10, 11 or 31 depending on how you count the fins.
That said, if I was actually drawing this I'd like to add a bunch of fillets to dress it up a little. That would drive the part count significantly.
dr wogz
Fly caster
@boatgeek It also depends on what CAD package you have I have Creo.. So, some features would be grouped into 1 'feature' then arrayed /patterned. The fin could be drawn in a half, then mirrored [left side / right side], then arrayed..
And, I can do a series of fillets in one pass..
the body tube / shape oud be a revolve, and include the internal volume.. Or 'volumes' if you include the motor mount & CRS..
but that makes me a 'smarty-pants'
I am curious as to the dims Chuck is after.. and the answers to your questions.. it also reminds me of the URRF 6 rocket you could download..
https://urrf.us/urrf-3d-rocket/
I have Creo.. So, some features would be grouped into 1 'feature' then arrayed /patterned. The fin could be drawn in a half, then mirrored [left side / right side], then arrayed..And, I can do a series of fillets in one pass..
the body tube / shape oud be a revolve, and include the internal volume.. Or 'volumes' if you include the motor mount & CRS..
but that makes me a 'smarty-pants'
I am curious as to the dims Chuck is after.. and the answers to your questions.. it also reminds me of the URRF 6 rocket you could download..
https://urrf.us/urrf-3d-rocket/
boatgeek
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I use Rhino, so it would all end up as a single polysurface in the end. Calling that one part is kind of cheating, though.@boatgeek It also depends on what CAD package you have
And, I can do a series of fillets in one pass..
the body tube / shape oud be a revolve, and include the internal volume.. Or 'volumes' if you include the motor mount & CRS..
but that makes me a 'smarty-pants'
I am curious as to the dims Chuck is after.. and the answers to your questions.. it also reminds me of the URRF 6 rocket you could download..
https://urrf.us/urrf-3d-rocket/
View attachment 538363
RCBrust
Well-Known Member
I just have to do the fins. I should have those by tomorrow. These are from the original drawings.
Randy
Randy
dr wogz
Fly caster
and that is the proper answer! never redraw, when you have the dwgs / datasheet!!
It's a real flying rocket. See my avatar.
It's 21.75" tall
Fins (3) are about 9.5" apart at base
Airframe is about 5" at widest section
As stated in earlier post, it has a 38mm stuffer tube
RCBrust
Well-Known Member
Ok, that went pretty quickly.
Randy
Randy
That is pretty quick.
RCBrust
Well-Known Member
Here are two STL files, the separate airframe (slotted), and the fin. Note that they are actual size, i.e. big, so you'll have to scale them down in your slicer. 10% is a good starting point. I tried to include a complete model but the file is too large.
Randy
Randy
RCBrust
Well-Known Member
Also, here's a STEP file in case anyone wants to play with it.
Randy
Randy
Thank you.
H_Rocket
Death by Powerpoint
It only counts if you get a cease and desist order after you file your flight card.
dr wogz
Fly caster
Can the old build thread be resurected?
I think we can do one for a 3d Printed version added to the thread.
RCBrust
Well-Known Member
Hey Chuck, did you ever try printing it?
Randy
Randy
I started printing it. Then I decided to down scale it a little.
I started modifying it to print. I have the top and bottom ready to go at about 25% size and a 29mm motor mount.
No how do I print those fins? I am thinking about using a resin printer.
No how do I print those fins? I am thinking about using a resin printer.
RCBrust
Well-Known Member
Yeah, the fins are tough. Maybe print them in two halves and glue them together? At 25% the thin section of each fin half would only be about 0.8mm thick though.
I think if I built a flying model at 25%, I'd use G-10 for the center of the fins and then add printed sections on each side for the thicker part. On the original ship, the thin fin sections are 1/4" thick so at 25% scale, they'd be 1/16". That's perfect for standard 0.062" G-10. The G-10 would greatly increase the fin strength.
Randy
