Falcon IV (oz7871)

 

Falcon IV (oz7871) by George Steiner 1976 - plan thumbnail

About this Plan

Senior Falcon IV. Four-engine conversion of the Carl Goldberg Senior Falcon (oz6137) design.

Quote: "A modified Carl Goldberg Models Senior Falcon makes an ideal multi-engine trainer and sport ship with four Enya .15's. Weight ready to fly is 13oz for a wing loading of 23 oz per foot. Five channels are used operating rudder, elevator, motor, aileron and brakes. Four six oz tanks are required.

A four engine Senior Falcon? You have to be kidding! This is what I hear every time I bring the Sr. Falcon to the field. Seems to be appropriate words though, but I am not kidding.

How would anyone ever venture into a project like this? Well, it seems ever since I started flying R/C models, back some 8 years ago, I dreamed of some day having a four engine craft of some kind. I think that every RC'er has thought of building and flying a big four, at one time or another. You say: One has enough trouble with one lousy engine, let alone four. Well, that could be true, but I figured if I took my time and moved up to a project like this using a reliable proven flying platform, the project would go smooth and easy.

I started by selecting, as I said, a stable platform to work from. I wanted something that was a proven flier and had a lot of wing area. Looking over the scale jobs available showed me nothing but disappointment. What you hear and see is nothing but trouble if you are not a super experienced pilot. If I wanted something to fly I had better forget about anything on the market that had multi-engines. It would be sheer disaster with my experience. I wanted my four engine turning bomb to fly, and as easily as possible. You see, I know my capabilities and wanted something that took very little hassle to become airborne. I consider myself a typical Sunday flier.

My experience with the Carl Goldberg Falcon group seemed to be what I was looking for. The Senior Falcon (oz6137) would be ideal to modify and besides, I already had a kit on hand. The wing area was large enough to pack the extra load that would be impressed on it. The basic airframe was strong, straightforward, simple to build, had no compound curves and I knew that basically it would fly.

All I had to do was concentrate on the engine nacelles and that horrible linkage that would drive anybody up a wall. But as you read on, you can see how I solved the linkage problem. Remember this project objective was to have a multi four-engine plane that didn't take a super expert to get it off the ground and back.

One of the first things I did when planning to get the project off the ground was to select the power plants. Like a lot of things in life, you tend to follow the direction of least resistance and, at this time, I just happened to have two Enya 15's, half-way there so to speak. All I had to do was find and purchase two more. This was no problem. One at one hobby shop and another at another one. To top it off, one of my flying friends gave me a well broken-in one. This all turned out to be a big mistake and caused most of the irritating problems of this project. So what I recommend is that, when purchasing your engines get them all at once from the same place and, hopefully, they will be out of the same mould.

Out of five engines to fool with, they all ran at top rpm differently. It has taken many hours of block testing on the bench to get them broken in to the point of being synchronized. Be sure to run all of your engines real well if you intend to take on this project. Note the little difference between each so when installing the engines you can balance the power output on each side.

The construction of the engine nacelles seem to be in order at this stage. If you can't get through making your engine nacelles, you can forget the whole project. The nacelles are time consuming but once you get started it's not all that bad. In looking over the nacelle's layout, the best may is to start by gluing formers N-2 and N-3 to the hardwood motor engine rails. N-1 can be glued after N-2 and N-3 are dry. N-4 was glued to the tail block to give an idea for its shaping. Place the 1/8 side sheeting on and glue the tail block in place. Do the bottom sheeting next. These should be a bit oversize so sanding will let the quarter side planking fit snugly.

N-5 is glued in place later after the mount-ing dowels arc put in place. It is best to wait until the wing is under construction before gluing or epoxying the dowels in the nacel-les. This will be done after the 'P' blocks have been drilled and placed in the wing..."

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Falcon IV (oz7871) by George Steiner 1976 - model pic

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