Cricket Tail BoomsGentlemen,
I thank you all for your patience and support. I am hoping that all of the confidence in my ability has been attributed to my dedication to the Cricket and so far, for those of you who have purchased parts from me already, proof of the quality in the parts that I offer. Thank you Marc for the kind words. And, although I am working from the original drawings, let me add a bit to that.
I have taken many of the dimensions of the tail boom from the original drawings, penned by the Master himself. HOWEVER, when compared to original GMP production samples, the drawings are not always accurate. For example, the drawings state the slot where the tail drive wire exits the tube should be 1-1/4 inches in length. Most of the samples I measured were approx. 1-3/8 inches in length. Also, I placed four brand new GMP factory tail booms together side by side. I placed a common 1/8 inch shaft through the first frame mounting bolt hole on each tube. I found NONE of the four brand new examples to be identical. The booms were of slightly different lengths, the tail drive wire slots were of different lengths, widths, and located at slightly different ( fore and aft ) positions on the booms. While I could easily get the 1/8 inch shaft between all four booms on the first bolt hole, I could not, without forcing it, get a second shaft through the others, indicating that the spacing of the mounting holes was not accurate either. Lastly, two of the booms had slightly different bends compared to the others, and none of them had the same bend angle as that found on the drawing.
The point I am making here is that design of the boom does lend itself to various tolerances,some of them very generous!
Now, I concentrated on what I feel is one really major problem I see all of the time. That wooden plug stuffed in the boom at the mounting point always lends itself to the boom "crushing" if the bolts are over tightened. What I did was to drill the mounting holes a little bigger in diameter, cut and install two brass tubes in which the mounting bolts will pass through, then fill the end of the tube with resin. Once cured, the mounting of the tube is very, very much more durable than the wooden plug.
Also, keep in mind, other than having the end forming done (the flaring of the tube at the tail gearbox end) EVERYTHING else is done by hand. The drilling, milling, reaming, cutting, making of the bearing insert, and the polishing are all done by hand. I finished the construction of the jig last weekend and so far have produced one perfect "trial boom". Within the next week or so, as I get everything in order, I will let you guys know. You can then send me a PM with your orders. I will fill them in the order that I receive them. All I ask is PLEASE, PLEASE give me two weeks or so per order. This will surely take up all of my spare time to do these, but I guarantee, you will be more than pleased. And don't worry, I have more than enough to go around. Thanks fellows!