Radio Controlled Soaring Digest March 2004 Issue
Issue Contents:
Review of Mark Tribes (Acme Flying Machines) Tempest. Wings are skin hinged and gap sealed. Custom colors gel coats offered. 127″ span A/r = 16:1 MH32 11.23 oz/ft 2 loading. Flaps are tape hinged.Wing wiring is pre installed to each servo cut out. Model does well in penetration but is not a floater. A lighter stab and rudder would decrease weight. A V tail version weighs only 79 oz.
A discussion of wash-out wash-in is given. Washout reduces tip stall while wash-in causes the wing tip to stall before the wing root. Tests proposed to discover the problem on your model. Slop model gradually and hope for a straight stall without going into a spin. An incidence meter is the best gauge of checking it out during construction. Changing Wing Twist Methods are given.
Mark references a Charles River RC Site article about using wax paper to handle light weight glass cloth. Spray paper w/ 3M 77 then apply glass cloth to target surface so paper can be removed.
Greg builds on his Nov 03 article on planforms to discuss the aerodynamics of circling flight planform. 3 planforms are compared at different airspeeds. Lift and Drag at 32 points along a wing are compared for 5 levels of bank. Cd toward tip of a tapered wing because of low RN
Gordy explains that students need to understand the functions of pitch yawbank in a ground school before putting a model in the air.
Diva Pt 2 – Spar Construction A scarf joint for a sweep change at end of main panel is discussed. Elevator actuator system is shown. Instructions are given for cutting out control surfaces. Aileron Servo location and mounting Elevator control linkage Fuselage Construction
Advice on getting good photographs of models have to do with knowing the effect of shutter speed on subject motion and camera motion proper exposure depth of field to know what is in focus film sensitivity and grain size. Hold camera steady with elbows against body. For models in flight have model fly close and slow. Take plenty of shots if you need a few great ones. A list of good photography books is given.
RCSD is in 21st year. At its peak it had 2200 subscribers but now down to200 the last printed issues is mailed this month. Subsequent issues to beon the Internet at www.b2streamlines.com/rCSD.htmlThey will be PDF versions in color.
Alden Shipp of Lucas KS flys a Daves Aircraft Works Messerschmitt Me-162Comet in slope lift at NW Clope Challenge 2000.
Radio Controlled Soaring Digest March 2004 Issue
