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Old 11-18-2018, 12:23 PM
Ltvscout Ltvscout is offline
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Default 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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File Type: pdf Fat_Boy_1273_2139_Fins.pdf (953.2 KB, 81 views)
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Old 11-19-2018, 06:42 AM
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astronwolf astronwolf is offline
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Default

Quote:
Originally Posted by Ltvscout
Here's a scan of the fins and centering rings for the Estes Fat Boy thanks to Edward Beauchemin.

Missing ruler.
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Old 11-19-2018, 07:29 AM
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tbzep tbzep is offline
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Quote:
Originally Posted by astronwolf
Missing ruler.

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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Old 11-19-2018, 05:50 PM
olDave olDave is offline
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Default 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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