Yoicks (oz1581)

About this Plan

Yoicks. Control line biplane stunt model. With laminar airfoil section. Wing area 450 sq in, for 5-10cc power. Fox 59 shown.

Quote: "INTERESTED in the monoplane versus biplane stunting controversy, impressed by Henry Nicholls' performance with his de Bolt Bipe and HN7, and encouraged by the advent of a beautiful new shining Fox 59 from America, the designer set about designing himself a real stunt bipe capable of all the manoeuvres of the original oozlem. With a Fox in front - well, obviously it had to be Yoicks and so this attractive machine materialised.

Construction is all balsa, simple but sturdy, and the finished weight with the Fox was only 2-1/2 lbs. However, any 10 cc engine will take it through its paces and the plan is drawn for a Nordec even with which the weight should still be under 3 lbs.

The cowling question was settled once and for all by a neat arrangement using baby brass hinges for the flaps, and spring steel clips locating on wire or gramophone needle pegs as the snap-shut fixture. No trouble was ever experienced with shutting this cowling or keeping it shut in flight.

The model as might be expected flies fast and long lines can be used without fear of any tendency to turn in. Seventy feet lines were originally used, but eighty to ninety feet will give considerably less armache. Very sensitive, the model will perform anything in the book plus extras, but is none the less easy to handle for anyone with average stunt experience. A special feature of the design, laminar flow wings were used after reading some notes of HJN's on the subject - and a truly amazing glide is a characteristic of this model which it is often felt the section should perhaps take credit for.

The model was designed with a fully fixed undercarriage to comply with the SMAE rules, as it seems silly to learn a model's characteristics without an undercarriage, then equip it with one for a contest only to find that the model's behaviour is distinctly different.

Take offs are a joy to behold, and many a time the model has been airborne before it was placed on the ground - one almost places it in the air and watches it carry on from there! Being so fast it is wise to hold the stick hard back and let it get right off and up before levelling out, as otherwise a slight over-controlling on take off will tip the model straight in, which is bad for airscrews.

Warning: Don't use this or any other fast heavy model on a U-Reely as the brake on the handle won't usually stand it - the lines suddenly jerk out and comes disaster, witness Yoichs' untimely end at Aldermaston earlier in the year."

Update 12/07/2017: Replaced this plan with a clearer scan, thanks to JJ. Also added article pages thanks to Algy2.

Supplementary file notes

Article.

Corrections?

Did we get something wrong with these details about this plan (especially the datafile)? That happens sometimes. You can help us fix it.
Add a correction