Minnie Most (oz7102)

 

Minnie Most (oz7102) by Howard McEntee 1962 - plan thumbnail

About this Plan

Minnie Most. Radio control sport model, for Cox .010 power.

Quote: "This is a single channel design by Howard McEntee and is a later, smaller version of his 1958 Minnie design. This one is called Minnie Most and was published in the May 1962 issue of AAM."

Update 27/3/2024: Replaced this plan with a clearer copy, scanned at 400 dpi from fullsize, thanks to dfritzke.

Direct submission to Outerzone.

Note this version also includes some text instructions.

Quote: "(Additional construction data for Minnie-Most): All balsa surfaces were covered with Jap tissue, smoothed on with the fingers and butyrate dope. Fuselage nose cheeks (papered beforehand), stab's bamboo stiffening strips, trim tab, and rudder were not ad4led till this papering. All wood surfaces had butyrate filler coat before paper was applied; wing got three coats of clear buty-dope over paper, all fairly thin for easy brushing. Fuselage has one coat clear, two thinned color, then two thinned clear.

Otarion 0-21 receiver and Acme #130 holder mount on 1/32 ply - on rear cement 1/4 in thick foam rubber. This in turn cements to 1/16 balsa 'slide' (grain across fuselage). Assembly backs against forward bulkhead. To remove receiver set is held in with aluminum strap. Note 1/8 foam plastic.

Sketch shows how relay is adjusted. After the wire extension is soldered to armature and Teflon tubing slides over end (any small diameter tubing that will fit tight on wire will do, including insulation from plastic covered wire) adjust weight so armature is in balance, with spring detached. Torque rod, yoke and 1/32 music wire 'pin' at rod rear are balanced by weight which angles out from yoke. Torque rod, in brass grommets at both ends, is 1/16 OD aluminum tubing; this can be tinned with Sal-Met flux, after which you solder yoke to it.

Rudder isn't balanced but is hinged on tubing and music wire, for easy operation. A tiny Otarion #2705 switch mounts on the 'floor' under trailing edge of wing protected by aluminum.

Flight tests showed the 12 in receiver antenna ample for as far as one can see this tiny plane. A three-pin plug from Mini-Verter plug separates wires to relay and switch so slide comes out of plane.

Otarion's receiver features a tuning bulb. Since bulb draws almost as much current as actuator we pulled one of the bulb leads free of the printed circuit. A high resistance earphone can be clipped across relay coil terminals for tuneup (use wirewound, not crystal type unless you put capacitor in series with latter). Jumper wires from relay coil terminals to two terminals atop relay insulating plate make it easier to clip on phone wires. A zero-to-3-volt meter may be clipped to these terminals to check tuning, or to determine how battery stand up under load.

The receiver pulses at a good rate, so rudder can be made to 'wiggle' fast enough so plane won't deviate in its flight path. This steering affords smooth flights.

When you have broken-in engine (this takes about a minute!), made distance checks, and ground trials with engine running, hillside test glides are in order. CG shown seemed just right; small adjustments may be via trim tab. After glide is as good as possible DON'T try power flight without reversing prop! Even with thrust cut this way, our 6.3 ouncer has an astonishing climb."

Supplementary file notes

Previous scan version.

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Minnie Most (oz7102) by Howard McEntee 1962 - model pic

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* Credit field

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Scaling

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