Gentry Bill of Materials
LUMBER & PLYWOOD: All plywood must be intended for marine or
exterior use; interior grades are not acceptable. The marine grade panel
features higher grade inner ply cores, while the exterior grade cores may have
voids not apparent to the eye, use cores made from woods not as suitable for
marine applications, and be less than the specified thickness. In most cases,
the glues used in both the marine and exterior panels are the same waterproof
type. However, the decision to use exterior panels in lieu of marine panels
must lie with the builder, considering the particular use of the panel in the
boat and the expected service. The letters A, B and C designate the grade of
the exterior veneers with A grade the best, etc. Douglas-fir plywood is
acceptable for all plywood, although mahogany or other attractive veneers are
preferable in many instances as described in these instructions. All lumber
used should be first grade, free from knots, shakes, checks, or other defects.
Grouping lumber and purchasing "random-random" material to resaw to
the required size will result in considerable savings. All lumber sizes should
be checked to the work before purchasing wherever possible. Lumber typical to
the locale and proven in use in boats of similar type can be used as long as
the weight, strengths, and characteristics are similar. Suitable boatbuilding
woods include white oak, mahogany (Mahog.- Philippine dark red, American, or
African types commonly used in boats), Sitka spruce, Alaskan cedar, Port Orford
cedar, Douglas-fir (DF), longleaf yellow pine, and apitong.
HULL MATERIAL LISTING: The following material listing is an estimate of
the materials required to build the basic hull. The listing is intended to
serve as a general guide only and should not be used to purchase materials
until the various options and alternatives have been checked to the plans, to
the work, and to the materials which may be available in the area in which the
hull will be built. The listing may vary due to the amount of waste and other
variables that cannot be controlled. Lumber listed as 1" is to be
"four quarters" stock milled; this usually results in a 3/4"
thickness. DO NOT BUY 1" NET LUMBER. Lams listed as 1" x 5/8"
are ripped from 1" stock and will be 3/4" x 5/8". All widths are
net and lengths allow for fitting. All 2" lumber is to be "lumberyard
size" in both thickness and width. Thus a 2" x 6" will probably
net 1 1/2" x 5 1/2".
| ITEM |
MATERIAL |
NO.
PCS. |
SIZE |
| LUMBER: |
| Transom #0 |
| Uprights |
*¥ Mahog |
1 |
1" x 3" x 24"
makes 2 |
| Center upright |
*¥ Mahog |
1 |
1" x 1 1/2" x 18" |
| Floor timber 2" |
*¥ DF or Mahog |
1 |
2" x 3" x 18" |
| Floor timber 1" |
*¥ Mahog |
1 |
1" x 1 1/2" x 18" |
| Bottom |
*¥ Mahog |
1 |
1" x 8" x 5'
makes 4 |
| Horizontal shelf |
*¥ Mahog |
1 |
1" x 6 1/2" x 5'
makes 2 |
| Sides |
*¥ Mahog |
1 |
1" x 6" x 3' |
| Frame #1 |
| Frame #1 - Sides |
* Mahog |
1 |
1" x 9 1/2" x 28"
makes 2 |
| Bottom |
* Mahog |
1 |
1" x 7" x 5' 6" |
| Frame #2 |
| Frame #2 - Sides |
* Mahog |
1 |
1" x 9 1/2" x 2' 6"
makes 2 |
| Bottom |
* Mahog |
1 |
1" x 8" x 5' 6" |
| Frame #3 |
| Frame #3 - Sides |
* Mahog |
1 |
1" x 8" x 2'
makes 2 |
| Bottom |
* Mahog |
1 |
1" x 8" x 3'
makes 2 |
| Deck Beam |
* Mahog |
1 |
1" x 8" x 7'
makes #3 & #6 |
| Frame #4 |
| Frame #4 - Sides |
* Mahog |
1 |
1" x 8" x 2' 2"
makes 2 |
| Bottom |
* Mahog |
1 |
1" x 6" x 2' 7"
makes 2 |
| Deck Beam |
* Mahog |
1 |
1" x 7" x 6' 8" |
| Frame #5 |
| Frame #5 - Sides & bottom |
* Mahog |
1 |
1" x 6 1/2" x 7' 6"
makes 2 |
| Deck beam |
* Mahog |
1 |
1" x 6" x 6' |
| Frame #6 |
| Frame #6 - Side & Bottom |
* Mahog |
1 |
1" x 7" x 4' |
| Deck Beam |
* Mahog |
See #3 |
| - |
| Keel |
Mahog |
2 |
1" x 5 1/2" x 14' |
| Chine |
Mahog |
2 |
1" x 1 1/2" x 17' |
| Sheer |
Mahog |
4 |
5/8" x 1 1/4" x 18' |
| Bottom Battens |
Mahog
Mahog
Mahog |
4
2
2 |
1" x 1 1/2" x 17'
1" x 1 1/2" x 14'
1" x 1 1/2" x 12' |
| Side Battens |
Mahog |
4 |
1" x 1 1/2" x 18' |
| Motor Stringers |
DF |
2 |
2" x 6" x 13' |
| Motor Stringer Clips |
DF or Mahog |
1 |
2" x 2" x 6'
makes 8 |
| Strongbacks |
Mahog |
1 |
1" x 1 1/2" x 9' |
| Battens - Foredeck |
Mahog |
2 |
1" x 1 1/2" x 4' |
| Foredeck |
Mahog |
2 |
1" x 1 1/2" x 5' |
| Aft deck |
Mahog |
1 |
1" x 1 1/2" x 6'
makes 2 |
| Cowl & hatch (vertical) |
Mahog |
4 |
1" x 2" x 6' |
| Carlings |
Mahog |
2 |
1" x 6" x 14' |
| Hatch fwd. canted beam |
Mahog |
1 |
1" x 8" x 5' 6" |
| Hatch aft beam |
Mahog |
1 |
1" x 5" x 6' |
| Aft deck canted beam |
Mahog |
1 |
1" x 7" x 4' 6" |
| Cowl fwd beams |
Mahog |
1 |
1" x 5" x 6'
makes 2 |
| Hatch & deck cowl cleat |
Mahog |
2 |
1" x 1/2" x 9' |
| Coamings |
Mahog |
2 |
1" x 7" x 12' |
| Clamps |
Mahog |
2 |
1" x 4" x 12' ¹ |
| Finishing board/deck batten |
Mahog |
2 |
1" x 3/4" x 14' |
| Finishing board lams |
Mahog |
24 |
1" x 5/8" x 18' ² |
| Transom finishing cap |
Mahog |
1 |
1" x 5/8" x 6' |
| Transom finishing cap |
Mahog |
1 |
5/8" x 5" x 5' |
|
Notes:
Misc. blocking and cleats not listed.
* Not required when Frame Kit has been purchased.
¥ Not required when Transom Kit has been purchased.
¹ Clamp is segmented and molded 2 1/2" wide; will not require
4" wide stock for most members.
² May be butt joined per instr. Assumes 12 lams.
|
PLANKING: These instructions give several options for planking. e.g.,
The inner veneers may be less expensive lumber than the outer layer, and
plywood can be used optionally on the bottom. Thus, the following quantities
are given in square footage of area to be covered. The bottom is to be a total
of 5/8" thick, the sides a total of 1/2" thick. Veneer thickness will
vary, depending on the number of laminates used. If four laminations of veneers
are used, multiply the area to be covered by four to obtain the total square
footage required. Cold-molded construction results in considerable waste; most
add 20% to the square footage of the veneer to obtain the total required.
Mahogany, dark red Philippine, or Honduras is advised for the outer lams.
- Total area for both sides = 55 sq. ft.
- Total bottom area = 90 sq. ft.
- Total transom area = 10 sq. ft.
|
These instructions give several options for planking. e.g., The inner
veneers may be less expensive lumber than the outer layer, and plywood can be
used optionally on the bottom. Thus, the following quantities are given in
square footage of area to be covered. If two laminations are used, multiply the
area to be covered by two to obtain the total square footage required.
Cold-molded construction results in considerable waste; add 20% to the square
footage of the veneer to obtain the total required. Mahogany, dark red
Philippine, or Honduras is advised for the outer lams.
- Total area for both sides = 55 sq. ft.
- Total bottom area = 90 sq. ft.
- Total transom area = 10 sq. ft.
PLYWOOD: Minimum plywood grades are listed. Exterior (ext.) grade
plywood is specified, however, a full marine panel is preferable. The letters
"AB" designate the quality of the exterior veneers, however
"AA" panels are better. Douglas-fir (DF)* veneers are acceptable, but
mahogany or similar veneer surfaces are desirable for a natural finish and some
imports are of higher quality than U.S. specifications.
|
| ITEM |
MATERIAL |
NO.
PCS. |
SIZE |
| **Gussets & transom deck beams |
DF Ext AB |
1 |
3/8" x 4' x 4' |
| Foredeck 1st lam |
DF Ext. AB |
2 |
1/4" x 4' x 8' |
| ** Floor timbers, stem, & breasthook |
DF Ext. AB |
1 |
3/4" x 4' x 6' |
| Cowl, aft deck, & hatch |
Mahog ribbon grain AB |
2 |
1/4" x 4' x 8' |
NOTE: See instr. "Decking Comments" regarding 8'
length.
** Not required when Frame Kit has been purchased. |
FASTENINGS:
- Screws: Flathead wood type, bronze or hot dipped
galvanized
- NAILS: Bronze ring type boat nails.
- 3/4" #14 = 1/2 lb.
- 1" #12 = 2 lbs.
- 1-1/4" #12 = 1 lbs.
- SCREWS: Flat head wood screws, hot dipped
galvanized or bronze.
- 1 1/4" #8 = 5 gross
- 1 1/2" #8 = 2 gross
- 2" #10 = 4 0nly
- 3" #14 = 3 dozen
- CARRIAGE BOLTS: Hot dipped galvanized or bronze
with nut and washer; lengths to be taken from the work.
- 3/8" = 2 required at stem/keel junction.
- 1/4" = 40 required for clips
- 1/4" = 20 required for frames to deck beams
Adhesives: Epoxy adhesives are advised throughout the construction
either an epoxy glue or epoxy resin. Epoxy resins should be used with
thickeners (wood flour, microspheres and silica or equal) per the instructions
with the resin and/or thickening agent. Wood flour with epoxy will dry to a
brown color and is preferable for bedding final mahogany laminates in place.
Due to the noted options and the probable waste the amount required is
difficult to estimate. Start with a five gallon container of epoxy and after
use you will be better able to estimate the total amount required.
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