The first plans this time is a Jerry Behren's Sopwith
Triplane. And it's damned good set of plans, as all of Jerry's
plans are. The fuselage is built up of quarter square pine,
with quarter inch plywood box from the firewall to the rear of
the cockpit. Besides the strength the ply box gives, it also
keeps the weight in the front where it is needed, because of
the extremely short nose movement, that was common to all
rotary engined WW-I fighters. Jerry has done a beautiful job
recessing the engine mount so the skid is built up from
plywood, with steel fittings and steel shoe and is sprung
internally. A very scale arrangement. This is one airplane that
should have a one piece landing gear and it does. It is made
from 3/16" wire and faired with balsa. So far no shock mounting,
right? But wait, at the apex of the landing gear strut
vee, there's a steel fitting, with a vertical slot for the axle to
ride in and it is wrapped with bunge cord same as the
original, and should work the same way.
The engine cowl is made from fiberglass and can be
obtained from Fibreglass Master. See Advertisement...
(We do have their new address, the company has moved).
The empennage is built up from ply and balsa with
laminated leading and trailing edges and tips. The whole
empennage bolts on, and is adjustable for trim. The wings
on this Tripe are a joy to behold, there are three of them but
they are well built, with the front spar in each panel, built as
a box, from spruce and ply. The rear spar is hard balsa. All
wing panels plug in and are built for quick assembly. You
are also given the choice of two airfoil sections, a section
with under cambler and a semi-symmetrical section for
sport scale. There are also six ailerons on this airplane. Ribs
are from 1/8th inch balsa with two false ribs between each
full rib. Interplane and cabane struts are made from 3/8th
plywood with metal fittings. Jerry doesn't give a projected
weight, but I would guess around twenty pounds, and with
2,325 inches of wing area, the wing loading comes out to
about nineteen ounces. A very light airplane. A good set of
plans that can be purchased from Behren's Plan Service,
31-27 Healy Avenue, Far Rockaway, New York 11619. Price is
$21.95. A partial kit is also available for $110.00.
There is also a very comprehensive instruction booklet
with this plan set and every set of plans Jerry sells.