Erins Lass (oz4259)
About this Plan
Erin's Lass. Radio control sailplane.
Quote: "THIS month, Soaring presents Don Dewey's 70in sport glider, Erin's Lass. Designed for use with the new decoded pulse proportional systems such as the Uni-Tronics Mustang 200 or the Min-X 1200 with twin Rand actuators, this machine is an excellent sloper. An optional power pod for a Tee Dee .020 is shown for those without access to a suitable slope soaring site.
Erin's Lass was constructed for the pulse proportional systems to prove that a proper design could overcome the drag created by the large flapping surfaces. In fact, this glider penetrates extremely well, is quite fast, and has been flown in winds from 0-20 knots. Both of the aforementioned decoded systems proved to be extremely reliable, although we did prefer the Uni-Tronics system which utilizes the fast pulse rate for up-elevator. Both systems used Rand actuators.
Begin construction of Erin's Lass with the wing. The ribs are made from medium 1/10 sheet balsa. The split trailing edge, top leading edge sheeting, and center section sheeting is 1/10 sheet stock. Spars are 3/16 sq spruce. Be sure to include the 1/16 sheet webbing between spars as shown on plan. Leading edge is 3/8 square balsa.
If you desire a permanent power pod, it can be constructed of a 3/32 plywood core with a lamination of soft balsa on either side. The pod is built up of two soft balsa blocks with a 1/8 ply firewall. The base of the pod's plywood core can be slotted to fit over the spars, and the entire assembly sandwiched between the two wing panels when the panels are joined.
Be sure to check for proper dihedral. After sanding the wing, cover the center section with a 3 in wide band of fiberglass tape and two layers of resin. Celastic may be used, if desired. Cover the wing with colored silk. Dope and add trim, as desired.
Engine, of course, is the Cox Tee Dee .020 with 3-1/8 dia 2-1/2 in pitch, 3 bladed Thimble Drome prop.
The tail assembly is of built-up construc-tion and should offer no difficulty. Note the lightening holes in the sheet elevators..."
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Supplementary file notes
Article pages, text and pics, thank to hlsat.
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