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  #1  
Old 05-30-2005, 01:49 PM
CPMcGraw's Avatar
CPMcGraw CPMcGraw is offline
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Default Scrounged-Up Designs 2006

Here's a cheap-n-dirty quickie that I whipped out last night to kill off some extra components that were just laying around, otherwise minding their own business...

The NC came from an Estes Hi Flyer that I scavenged for the motor hook, and the BT started out as a whistle tube from the Estes Screamin' Mimi.

I call it PUG, and it uses 13mm motors. Streamer recovery.

Enjoy.


Craig McGraw
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  #2  
Old 05-30-2005, 05:09 PM
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ScaleNut ScaleNut is offline
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nice !.. reminds me of the old goblin
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  #3  
Old 05-30-2005, 09:57 PM
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CPMcGraw CPMcGraw is offline
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Default New Design -- Scorpion

Here's another quickie, though not as simple as the Pug. This one is more along the lines of the Estes Interceptor and Quest Intruder.

The canopy is modeled in RS as a chunk of balsa, and should actually be more rounded than the simulation allows. This piece could also be created in clear plastic sheet, vacuum-formed. The engine intake cheeks are also shown as balsa chunks, and can probably be left this way. Again, this is a limitation of the simulator. You might choose balsa sheet to form a hollow cheek set to reduce some weight, but probably not much.

There should also be 6 simulated cooling fins attached to the motor tube, for show...

500' on a C6-5. This is the preferred motor.

Enjoy.


Craig McGraw
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  #4  
Old 05-30-2005, 11:18 PM
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CPMcGraw CPMcGraw is offline
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Quote:
Originally Posted by CPMcGraw
Here's another quickie...


These designs will be worked up into full PDF plan booklets, with templates and alignment guides, and possibly decal images, at a later date. When completed, they will be sent to Scott for posting to the BARCLONE website.

I'm posting them here first to let everyone have a go at them and hack on them, hopefully so you can send me some feedback on them before I get so far along with the PDFs that there's something missing.

Craig...
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  #5  
Old 05-30-2005, 11:37 PM
rkt2k1 rkt2k1 is offline
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Craig,

I like your designs! If these are "scrounged up" designs, I'd love to see your "better" designs!

I tweaked the Scorpion design a little to add the cooling fins you mentioned in your post. Is this what you had in mind?

... Bill
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  #6  
Old 05-31-2005, 12:18 AM
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CPMcGraw CPMcGraw is offline
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Default New Plan -- Cone Itchy Way

A "Flying Cone Of Death" design...

Don't ask about the name. It's just a play on a word that I heard somewhere and can't get out of my head!

Craig...
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  #7  
Old 05-31-2005, 12:28 AM
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CPMcGraw CPMcGraw is offline
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Quote:
Originally Posted by rkt2k1
Craig,

I like your designs! If these are "scrounged up" designs, I'd love to see your "better" designs!

I tweaked the Scorpion design a little to add the cooling fins you mentioned in your post. Is this what you had in mind?

... Bill


Thanks, Bill! I appreciate that!

Yes, this is just what I had in mind for the cooling fins.

"Scrounged Up" doesn't always mean I have the parts on hand, but this is what I'd toss together if I had them...

RockSIM makes it so much easier to try new designs out...

Craig...
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  #8  
Old 05-31-2005, 04:38 PM
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CPMcGraw CPMcGraw is offline
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Exclamation New Plan -- No Tube Left Behind

Here's another truly "scrounged-up" design...

Think of a stretched "Totally Tubular"...

One plan note: The launch lug needs to be mounted on a standoff such that the rod passes through the center of one of the tube fins. The plan does not show this -- it has the rod running through the gap between the main tube and two of the tube fins. This might work, but I think it would be unnecessarily tight.

Craig...
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  #9  
Old 05-31-2005, 10:18 PM
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John Brohm John Brohm is offline
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Hi Craig;

Here's a quick way to calculate an answer to your question: if the body tubes are the same size then the space, or "void", between the tubes when they are just touching (are tangent) can be calculated from the following:

CV = 0.155BT, where CV = the diameter of the void, and BT = the OD of the body tubes.

I'd provide the full formula here except that the Forum's text window doesn't seem to permit me to cut and paste data from Equation Writer (but that's not a complaint Scott. Just an observation...).

So in the case of your tubular design, if the tubes were, say, BT-50s (OD = 0.976"), then the space between the tubes would accept a maximum diameter of 0.151"; I'd say a 1/8" rod has a good chance of sliding in there friction free so long as there wasn't too much paint build up. Saves you the lug and the drag that goes with it.



<Craig speculates:>

it has the rod running through the gap between the main tube and two of the tube fins. This might work, but I think it would be unnecessarily tight.
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  #10  
Old 05-31-2005, 10:36 PM
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Ltvscout Ltvscout is offline
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Quote:
Originally Posted by John Brohm
I'd provide the full formula here except that the Forum's text window doesn't seem to permit me to cut and paste data from Equation Writer (but that's not a complaint Scott. Just an observation...).

Hmmm, I've never used Equation Writer, but I know that cut & pastes work in the text edit box. Try pasting the equation to Notepad first, then cutting it out of notepad and pasting into the forum.
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