LLP-50 (oz14490)

About this Plan

LLP-50. Radio control model for electric power. Wingspan 38 in, wing areas 256 sq in.

Quote: "LLP-50, by Ron Standley. This little model (38-inch span) is powered by a Peck-Polymers Silver Streak motor and six 1000 mAH AE cells. Radio is a Futaba FP-4NBL, with S133 servos and pull-pull cable linkage. Total weight is only 17 ounces. and total Hight time averages 10 minutes (including a few aerobatics and some 1/2-power cruising).

This project started after a search for a small electric powered airplane. I found a few airplane kits and some nice designs in various magazines, but none were exactly what I was looking for. Most of the small airplanes were for the 05 size motors, with six or seven 1200 mAH cell power. This resulted in a plane larger and heavier than I wanted. My only recourse was to design a small plane more in line with what I was after.

This airplane is not a trainer. It is small, and does not have the power reserve that a good trainer should have. It is maneuverable, light and will produce fl ights of eight to twelve minutes under normal conditions. With a wing loading of around 10 ounces per square foot, it will thermal quite well. All balsa should be light except for the 1/8x1/4-inch spars; use medium balsa here. By accurately cutting the balsa, thin CA glue can be used for all assembly except as noted.

First, some quick specs on the airplane shown in this article. Wingspan is 38 inches (256 square inches), length is 25-1/2 inches, and power is a Peck-Polymers Silver Streak motor and six 1000 mAH AE cells. It is controlled by a Futaba FP-4NBL electric radio and S133 servos using pull-pull cable control. By using contest balsa and light covering, the weight of this combination came out to 17 ounces. I have been flying this configuration and can achieve flights of around ten minutes of sport flying (a few loops, spins, etc, and 1/2 throttle cruising).

Fuselage Construction: Cut two identical fuselage sides according to the plans. Pick one side and mark as the right side. Cut formers F2 and F3 from 1/32-inch ply. Cut F1 from 1/16-inch ply. All other fuselage parts will be cut to fit as they are installed.

Lay the right side on the plans and mark the location of formers F2 and F3 on it, then align the left side on the right side and transfer the former marks to the left side. The two fuselage sides should now show the position of formers F2 and F3. Trim 1/16 of an inch from the front of the right side and mark the position of F1 as flush to the front of each side. This will give the proper right thrust to the motor mount F1.

Pin the right and left sides down on a building board. Be sure the inside of both sides are up (you should see the marks locating the formers). It is not necessary to pin the sideson the plans, since the critica I locations of the formers are marked on the sides. Again, note that the position of former F1 on the right side is 1/16 of an inch back from the position shown on the plans, since this side is 1/16 of an inch shorter than the left side (the plans show the length of both sides, before the right side is trimmed).

Glue formers F2 and F3 in place on the right side, keeping both vertical to the side. Note that the notches on F3 are at the bottom..."

Direct submission to Outerzone.

Scan by MarkD, cleanup by Circlip.

Supplementary file notes

Article.

Corrections?

Did we get something wrong with these details about this plan (especially the datafile)? That happens sometimes. You can help us fix it.
Add a correction