Quickie Plans

Q1 Plans Chapter 7 Page 7-5

Details: Category: Quickie Plans; Published: Friday, 17 October 2008 01:00; Written by Dan Yager; Hits: 3671

FUSELAGE BOTTOM

Initial Layout - Join together two pieces of green foam as shown. Locate and mark BL00 on the foam with a felt- tipped marker. Do not be afraid to gouge the foam to a depth of about 0.2” in order for the line to remain visible. Mark STA32.9 about 1” from the left edge of the first foam piece. Now, using STA32.9 as a reference, mark and label stations every 10 inches starting with STA4O (e.g. STA4O, STA5O, STA6O, etc.).

The next step is to layout the fuselage bottom using the given offsets. As an example, at STA5O, draw a line perpendicular to BL00. Measure along that line 11.4” from BL00 and place a mark. That mark defines the outside edge of the fuselage bottom at STA50. This procedure should be repeated for each STA/Offset listed.

Then, using a long, flexible straight edge, fair a smooth curve thru all of the points. Since the fuselage bottom is symmetrical about BL00, this procedure can be repeated for the other edge.

A similar technique may be used to layout the FUSELAGE AFT TOP.

Finally, using a butcher knife, carefully cut out both the FUSELAGE BOTTOM and the FUSELAGE AFT TOP.

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Q1 Plans Chapter 7 Page 7-6

Details

Category: Quickie Plans

Published: Thursday, 16 October 2008 01:00

Written by Dan Yager

Contouring - In order to reduce weight and increase the interior room, the fuselage bottom is contoured on top side.

The drawing above shows the STA of each bulkhead that attaches to the bottom of the fuselage. These locations should be marked on the foam.

The dashed lines on that drawing enclose areas of foam that may be contoured Section A-A shows what a typical part of the bottom looks like after contouring. In essence, the homebuilder removes foam until the thickness is reduced to a minimum of 0.4” A toothpick with a mark at 04” is an effective way to check your progress.

Areas that are not contoured include:

Within 2” of the edge of the fuselage bottom

Within 1” of the bulkheads that you marked earlier,

Furthermore, all contouring must involve smooth transitions, i.e. no sharp corners or bumps are permitted. Section A-A details what the contouring should look like.

A wire brush, sandpaper, and scraps of green foam, are useful for contouring the bottom. Always wear a mask and vacuum often during the contouring.

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Q1 Plans Chapter 7 Page 7-5

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