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Old 10-03-2012, 11:12 AM
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tmacklin tmacklin is offline
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Join Date: Aug 2011
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Quote:
Originally Posted by bernomatic
I was actually going to write an article about this and submit it to th e peak of flight ezine, but figured everyone knew about this.

You can make your own body tube wrapping guides in less than five minutes and all you need is paper, pencil, ruler and a compass.

1) cut a strip of paper about an inch to two inches wide and long enough to wrap around the body tube with a little excess.

2) wrap the paper strip around the tube and overlap it to make sure the paper is perpendicular to the longitudinal axis .

3) draw a line across the paper strip using the end of the strip as a guide.

4) unwrap the strip and measure from the end of the strip used to draw the guide to the line drawn.

5) divide this distance by three for a three fin equally spaced fin rocket or four for a four finned rocket. for odd angled fins you will need to compute some percentages and I won't get into that here.

6) Use the compass (or if you have then, dividers) to mark off the distances along the strip of paper you have. Start at the end and measure back along the long edge toward your line.

7) Observe the difference between your last compass mark and the line drawn across the strip. adjust the compass larger or smaller to correct for the error. (Remember you are correcting the compass for 1/3 of the error for three fins.)

8) repeat steps 6 & 7 until your last compass mark comes out right on the original line you drew across the paper strip.

9 re-wrap the strip around the body tube and mark the fin locations as usual. Make sure when the strip is re-wrapped that the end of the strip lines up again with your original line.

That's it in a nutshell. If you can't follow or understand the procedure, you will have to wait till I get off my lazy rear and write the article with pictures.

Not only can printing processes change the distance between the lines, but other climate issues (humidity being the most common cause) can also make a big difference.



I don't mean to steal your thunder but I wrote an article about this very thing for Apogee.
(See "Peak of Flight" dated 3/27/12, #309) And yes, I am an "old draftsman" who learned this trick from an even older draftsman.
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