Tough Nut (oz9178)
About this Plan
Tough Nut. Control line stunter. 750mm wingspan.
Quote: "Tough Nut, by John Stroud.
THOSE OF OUR READERS who followed the progress of my 'likely lads' in the Aero Aces Flying Start series may be wondering what has happened to them. Well, I am pleased to say, that with four of them the aeromodelling bug has bitten. They received almost exclusively aero model-ling presents at Xmas, and now model building and sorting out new engines is even going on when they rush home from school at midday! To keep the funds flowing paper rounds and cleaning out cowsheds have been undertaken. So of course it is difficult not to be carried along by such enthusiasm and they still provide a proving ground for some of my own ideas.
Surprisingly all the trainers built are still in one piece, although they have now completed hundreds of flights. Before Xmas blessed our group with some new motors I started to design and build a trainer for the next stage in the programme around 1 to 1.5 cc motors, choosing the Davies Charlton Sabre and Spitfire. Although not suitable for fully aerobatic models these engines have enough power to achieve the next step forward. You may remember that I drew up three objectives to the training programme for control line flyers.
1. Learn to build models.
2. Learn to start and tune engines.
3. Learn to fly.
Tough Nut is intended to provide progress on all three fronts. Providing you have made a reasonable job of at least one solid balsa trainer, I consider you are ready to have a crack at a built-up structure. (If yours keeps falling apart into 'kit form' perhaps you should try your hand at another solid job first.) The criteria for Tough Nut's design were:
In order to get models of this type to perform aerobatics they must be light - the lighter the better. The trouble is that light aircraft can suffer from crash damage. I therefore decided to attach the wings with rubber bands as I did on my stunters some 30 years ago! Although Tough Nut might be voted '1980 Model of Yesteryear' this construction has two very positive advantages. Firstly the 'give' in the basic structure considerably reduces the likelihood of damage. Secondly one can easily rebuild whichever bit gets damaged without building a whole new model. In my experience box fuselages are remarkably strong and the tissue covered wings rarely suffer much damage and are easy and cheap to repair. Sellotape is handy for field repairs.
All the basic instructions are included on the plan but a few extra tips might be useful. Both Ian and Allan built Tough Nuts by copying mine, in its uncovered state, without a plan. Allan's is the 23in span version and is powered by a DC Spitfire. However, during test flying the tank has worked loose so glue yours in place firmly. The position of F3 should be adjusted to make the tank a tight fit between F2 and F3. It might be necessary to trim the bottom of F3 to allow the wing to fit in properly. This type of construction needs a snug accurate wing fit. Ian made the mistake of thinking this could be achieved after putting the fuselage together. It took him a long time to do it this way. The wing must rest exactly parallel to the top of the fuselage. Mark the exact centre of the leading edge and trailing edge and check after fitting. Pack it out if necessary and glue the packing in place.
The first two prototypes used our DC engines and the boys are getting quite expert at handling them. One problem we have found with the most used ones is that the compression screw tends to slacken off due to vibration. Mr Gilbert, a local model engineer, kindly made us up some locking levers. Cotton wound into the thread provides a temporary solution but one really needs a proper locking lever made, perhaps, in metalwork classes.
Flying: If you can fly a solid balsa trainer then Tough Nut will prove just as easy, if not easier, to fly. It is more responsive and maintains line tension when flown high. Good line tension can be obtained in any part of the flight path providing this type of model does not lose airspeed. Do not attempt any manoeuvre unless you have a good fast engine run and a good propeller..."
Scan from DBHL, cleanup by theshadow.
Direct submission to Outerzone.
Update 03/06/2019: Added article, thanks to RFJ.
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