Zoom (oz3099)

 

Zoom (oz3099) by Harry Stillings from Model Aircraft 1957 - plan thumbnail

About this Plan

Zoom. Radio control stunt model. Zoom, 53 in span all weather R/C stunter. Model Aircraft February 1957.

Replaced this plan with a clearer copy (patterned background removed) thanks to TonyP.

Quote: "An all weather radio control stunt model. Suitable for 2.5 to 5 cc engines. Zoom, by Harry Stillings.

ZOOM is the culmination of steady progress from one design to the next in the search for a compact, fast-flying, all-weather R/C model. It embodies several unique features, all of which have been thoroughly proved by practical experience. It is rugged and easily-built, although it is NOT intended as a beginner's radio moclel - the speed of flight and rapid response do not give a novice enough time to think, but any radio flyer who has had some experience will find this model a fascinating machine to fly. Even so, it is strongly recommended that one starts wiih the reduced-throw crank until the model is thoroughly trimmed and practice in controlling it has been obtained.

Zoom flies at nearly twice the speed or the average R/C model, and in diving turns the speed builds up to 40 mph and more. Almost any stunt can be accomplished, with practice, and I have even flown inverted for several seconds (unfortunately, I can't remember exactly how I did it!).

It will penetrate quite strong winds, yet gain altitude at the same time, and will zoom up to regain quickly all height lost in a stunt, so that it can be quite safely thrown about without having huge reserves of altitude. The glide, although fast, is quite flat, and with response not greatly less than under power, spot-landings are commonplace.

A most exhilarating trick is to 'dive-bomb' the transmitter to within 10 ft of the ground, by holding on for half a turn from low height (by which time the model is diving towards you at speed) when, by giving opposite rudder, it will zoom up into an equally fast climbing turn. Let go as soon as the model reaches a 45 deg. bank, when it will quickly level off, and thec manoeuvre can be repeated from the opposite side.

This must not be attempted until you have complete confidence in the model and your ownt control, and NEVER, repeat NEVER, immediately above any spectators. If, through any radio failure, the rudder should stick on, serious injury could be caused. At all times you should remember that under power Zoomn is very fast, and nearly 4-1/2 lb travelling at speed, can, wrongly applied, become very much a 'misguided' missile.

The combination needed to achieve these results is that or an over-powered to el with a high wing loading, (all-up weight is 4 lb 6 oz), and a large rudder having a fairly wide movement. The tendency tl) power-stall is overcome with built-in downthrust (see plan) - also, according to motor and prop used, 2-4 degrees right thrust will be needed. Because of the above factors, zoom needs a special launching technique.

You must walk back about 20 yards from the transmitter, run as fast a you can, and 'shoot' the model forward at speed, making sure that when it leaves your hand it is straight and level. Then get to the button as quickly as possible. In dead calm ar light-breeze conditions it may be necessary to launch from an elevated position so that the model has a margin of height in which to drop before reaching full flying speed, when, of course, wing lift takes it safely upward.

It is quite useless to trot a few steps and shove the model into the air as you would a sports model - it win just fly straight into the ground. Nor must packing be added to get it airborne, because once its normal fast flying speed is attained, such packing would create a bad stall.

The launching technique may take a little time to perfect, but once you've got the knack it will present no difficulties. If you have level tarmac available, ZOOM will take of in 30-40 ft, but you must be at-the-ready on tthe button to correct any tendency to turn off straight before it unsticks..."

Supplementary file notes

Article pages, text and pic. Also, previous scan version.

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Zoom (oz3099) by Harry Stillings from Model Aircraft 1957 - model pic

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