Cool Cat (oz8130)

About this Plan

Cool Cat. Radio control sport model. For .25 to .32 power.

Quote: "The 'Cool Cat' is the sixth in this line, featuring a lifting fuselage. The fuselage is configured to produce lift at high angles of attack. This is most apparent during take-off and landing. I was prepared for the above, as my Sport Scale Snorts SD3-30 commuter (also a lifting fuselage design) has the same characteristics; however, I was not prepared for all the added gravy. A dead engine at low altitude (such as shortly after take-off) results in double the glide length expected. This fact does in no way infer that this design is a 'floater'. Simply lower the nose to just off the runway, level out, and then raise the nose for a 'delta style' landing. Try that one with the average trainer type. A mild stall is simply a 'bump' - canard type. A severe stall blanks out the vertical stabilizer, causing a tail wag and a warning - get the nose down. Even in this severe stall, the wing can be kept level with ailerons, as you recover with little loss of altitude.

Despite all this tame behavior, the Cool Cat is highly acrobatic. The wing concept deserves much of the credit for the behavior of this model. Actually, having a 1% greater thickness at the tip than at center, to prevent tip stall, is not new. Also, forming ribs for a tapered wing as I have done, goes back at least 25 years. I simply put the two concepts together 20 years ago.

There is no need to be skeptical about your ability to form wing ribs in the manner shown. The alternative; making 12 patterns to cut out 24 ribs, really scares me - and it should. This is one reason why we have foam wings today."

Supplementary file notes

Article pages, text and pics, thanks to hlsat.

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