Bernie Hunt's Big Square 55 cm F1D



Thanks to Gert Brendel for these fine drawings
Drawing of Bernard Hunt's F1D55 model - scroll down to see material sizes, click on the picture to see a 123 kb version of this drawing.

Big Square


MATERIALS (dimensions in thou):

Wing Main spars 5 - 5,5 lb. 100 x 35 -> 63 x 35 (109 mg/pair)
  Tip spars 5 - 5,5 lb. 60 x 35 -> 30 x 35
  Main ribs 4,5 lb. 46 x 24 -> 65 x 24 -> 45 x 24 (Andrews)
  Tips 5 - 5,5 lb. 35 x 35
Tail Main spars 5 - 5,5 lb. 58 x 30 -> 40 x 30 (55 mg/pair)
  Tip spars 5 - 5,5 lb. 40 x 30 -> 30 x 30
  Tips 5 - 5,5 lb. 30 x 30
  Ribs 4,5 lb. 30 x 23
Stick Stick 4,3 lb. 0,013" x 0,76" x 13"rolled on 0,22" former + 4 x 0,004" Boron
  Bracing 5 lb. Post 1.25" x 0,040 -> 0,025", 0,001" tungsten brace
  Bearing   Harlan front bearing, 0,013" wire rear hook, 0,020" webs
  Wing posts (integral with stick) 6 lb. 0,067 x 0,050 + 2 x 0,004" Boron
  Paper tubes   0,060" dia - tubes are on wing
  Stub boom 4,5lb 1,5" tube x 0,009" to fit boom; 0,25" inner sleeve for join to stick
Boom Boom 4,3 lb. 18" x 0,009" x 0,74" -> 0,45" + 3 x 0,003" Boron
  Tail posts 6 lb. 1,0" x 0,06" x 0,040" + 2 x 0,004" boron
  Paper tubes on tail   0,045" dia
Prop Spar 6 lb. 0,06 x 0,06 -> 0,025" x 0,25"
  Ribs 5 lb. 0,03 x 0,025 -> 0,023" x 0,025" (Andrews)
  Outline 4,5 lb. 0,023" x 0,023"
  Own design VP mechanism, blades Steve Brown shape 8" long


Weights (grams)

Stick

0,31

 

Wing

0,31

(Frame 0,24)

Boom

0,15

 

Tail

0,14

(Frame 0,098)

VP Prop

0,26

(Fixed pitch 0,18)

Ballast

0,03

(0,11)

Total

1,20

 


Motor

0,052" x 8,7" loop 0,59 gram - 1560 turns.

Travel box

Dimensions: 23" x 9" x 8" (3 models).
Wing and tails on slider on the bottom of each slot; sticks on top. Props and booms in wider top slot.


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