#1
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Estes Fat Boy #1273 Fin and Centering Ring Scan
Here's a scan of the fins and centering rings for the Estes Fat Boy thanks to Edward Beauchemin.
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Scott D. Hansen Ye Olde Rocket Shoppe - Your One Stop BAR Shoppe! Ye Olde Rocket Plans - OOP Rocket Plans From 38 Companies! Ye Olde Rocket Forum WOOSH NAR Section #558 |
#2
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Quote:
Missing ruler.
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-Wolfram v. Kiparski NAR 28643 - TRA 15520 MTMA Section #606 President |
#3
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Quote:
It's a BT-80 kit so you can go by the centering ring. It snugly fits in a 2.56" i.d. tube.
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I love sanding. |
#4
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Or draw your own template directly
Plot a few coordinate pairs (as though you were playing "battleship")
I measured fins from two or three kits and came up with this: 8.85, 1.30 leading edge exposed root 10.75, 3.75 leading edge tip 12.65, 3.75 trailing edge tip 12.0, 1.30 trailing edge exposed root 11.50, 1.30 tab 11.50, 0.37 tab MMT edge 9.30, 0.37 tab MMT edge 9.30, 1.30 tab 8.85, 1.30 starting point That calcs out to a LE length of 3.10 inches, a LE sweep-back angle of 37.8 degrees, an exposed root chord of 3.15 inches, a tip chord of 1.90 inches, and a TE length of 2.53 inches. (originally posted Oct 14, 2004 on that other forum)
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NAR 20602 used to be "powderburner" in another life |
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