Ring Masters Flying Club
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REPAIRING A CRASHED RINGMASTER
"Sometimes things happen: (Allan Perret)
Allan told me that one day when he was practicing for Eldorado using one of his older planes. Since I have had the Broken Prop Trophy before (and probably will again) I thought I would chronicle a repair job on a Ringmaster I plugged into the ground one day. This crash destroyed the outboard wing as it hit the concrete circle while the rest of the plane was just inside the circle. Had I been completely over the grass The crash might have made only minor damage but the plane stuck into the ground up to the leading edge.
The photos with this write-up are numbered for reference
Let me start by stating that the better your initial build, the better chance of having a good repair. Weight is always a concern and profile fuselage construction takes a long time but doing it right, like thinking out your plywood doublers, extending motor mounts farther in, using hardwood inserts for landing gear mounting, sand radiuses everywhere leaving no square corners as stress risers, use the correct adhesives and cover the whole thing with several coats of clear dope ans lightweight Silkspan before you paint will all go a long way to making a strong fuselage that will take a head on crash better than just gluing it together and painting the bare wood.
I will gloss over cleaning the motor and tank but suffice it to say that it should be done such that all traces of grass, dirt ans sand are removed from tank and motor both inside and out
PHOTO 1: This shows the damage after the motor and tank and covering have been removed. Building a new inboard wing and mating it to the remaining plane was required. I salvaged the weight box and the outboard wing wheel tub. Prepare and clean up the remaining wing parts that will be sticking out of the center area so they will accept the new wing.
PHOTO 2: Cut out new ribs, shear web, spars, leading edge, wing tip, ect. and construct a new wing portion over the plans like the original construction
PHOTO 3 & 4: After the wing is made and sanded smooth, match the points where it will mount up to the original. Take care here to provide good mating surfaces for adhering the new wing to the plane.
PHOTO 5: Shows how I installed balsa splices to join the shear web together and in PHOTO 6 you can see the small trailing edge part I installed as well as the two splice parts to join the leading and trailing edges together. Glue the new construction to the old construction taking care to get good glue joints and to square every thing up into good alignment.
PHOTOS 7 & 8 Show installation of the weight box and outboard wheel tub into the new wing
Apply covering.to match the existing or, you can strip off the covering on the other wing and take the opportunity to completely change the look of the plane. I chose to match the existing.
PHOTOS 9 & 10 show the finished product.
Mount motor, tank, landing gear, check the CG (center of gravity) and other trim concerns and GO FLY.
this whole repair took only about 5 hours.
Thanks for reading