Hot Stuff (oz8836)

About this Plan

Hot Stuff. Free flight Jetex competition model.

Quote: "This design won the Open Jetex event at the 1966 Nats with an OOS on its third official flight. It offers high performance, ease of construction, and easy flight trimming. Article includes pointers on obtaining maximum performance from the Jetex 150 motor.

Hot Stuff is a consistent high-performance rocket model having an enviable contest winning record, the latest win being the open rocket event at the '66 Nationals at Glenview, III. It is the end result of seven years of rocket com-petition, designs and modifications hav-ing to do with different types of airfoils, wing and stabilizer aspect ratios and areas, moment arms, rudder location and areas, construction materials and related weights, etc.

For those of you who have never participated in rocket flying, be assured you are certainly missing out on a lot of rewarding fun in this torque-free event. It is a great change of pace from the gas, rubber, towline glider, or what-ever your cup of tea model flying might happen to be. It is an excellent event to get the younger generation started with in this great hobby of ours, due to the size and simplicity of the models. The youngsters really take to this event once they have been exposed to it.

Hot Stuff is easy to build and fly for both beginner and expert alike. Construction is conventional and straight forward so I will not waste your time with the old 'glue part A to part B' routine. Use lightweight balsa throughout the construction, Jap tissue for covering, and three thinned down coats of dope for finishing. Stay as close as possible to the weights of the various components as indicated in the table on the plans. Use self sticking aluminum Mylar tape on the tip ribs and leading edges of wing and stabilizer, top and forward edges of rudder, and on the nose of the fuselage after model is completed. The 'flashing' from the model in the distance when riding a hot thermal, can mean the difference between losing the model or recovering it. The Mylar flashing also helps the timer to keep the model in sight longer (particularly, those timers with weak eyes). At the '65 Willow Grove Nationals, bits of Mylar tape, put on my Wakefield rubber model in the right places, enabled me to set a National record in weather that was not conducive to record setting.

Be certain to use the DT fuse system shown on the plans. This side-of-the-fuselage fusing has no effect on the flight pattern of the model during the rocket-powered portion of the flight. To fuse the conventional, way, at the rear of the stabilizer, on a model of this size and speed gives one an undesirable rudder tab effect - dependent upon which way the fuse may happen to be bent - during the power run, and becoming critical during the last few seconds preceding 'burn out.' This was learned through the technical computerized programming of aerodynamic analyses, better known as the 'trial and error method.'

After completion of the model, put on the wing and stab. Attach the Jetex 150 motor (without fuel) to the fuselage with rubber bands. Move motor for-ward to achieve the correct CO loca-tion. Remove motor portion from Jetex mount and using the two wood screws provided with the mount, attach Jetex mount permanently to the fuselage. Make certain that the engine is straight on the fuselage. No downthrust or side-thrust. The motor thrust-line should be zero-zero with the wing. Angular difference between wing and stabilizer is provided for by the block under the trailing edge of the stabilizer..."

Hot Stuff, American Modeler, May 1967.

Direct submission to Outerzone.

Supplementary file notes

Article pages, thanks to RFJ.

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