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Rotor blades must always be carefully balanced. It is VITAL that you never fly or run up your helicopter in or near the pits area or near spectators. This is in addition to the regular R/C safety code. Because the BMFA feels so strongly about this the following comprehensive guide is set out below.
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(a) It cannot be stressed enough that a model helicopter must have a higher degree of safety built into it than perhaps any other flying model. If you still have trouble and you consider that your rights as an individual and a model flyer are being overridden, you should contact the BMFA office for help and advice as soon as possible. You are within your legal rights to ask to see a copy of the by-law that bans flying on the area you are using. (h) You may, however, find yourself in a situation where you are flying sensibly, safely and not causing a nuisance and are approached by someone who says he represents the Local Authority or some other official body and who tells you that you are not allowed to fly. (g) Be aware that some Local Authorities have by-laws banning the flying of powered models from their open spaces.
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Your behaviour and safety awareness could result in there being many new model flyers in the future. (f) Park flyers have the possibility of introducing model flying to great numbers of the general public who may never have seen our sport close up before. Your activities, with quiet slow models will almost certainly draw the attention of passers by - they could appear from anywhere. (e) Take special care to avoid putting members of the public at risk. Find out where models are being flown in your area and check on a local map that your chosen flying area is far enough away to be safe. (d) Be very careful to avoid flying near to existing model flying sites if you are using 35 MHz equipment. (c) Read the Safety Codes contained in this handbook carefully as virtually all of them still apply to this type of flying, especially those concerned directly with radio control. (b) Although virtually all of these models are lightly loaded, great care must be taken when flying them as you can be led into situations that you would not face on a club field. (a) There are numerous electric powered ‘Slow Fly’ or ‘Park Fly’ models on the market that may be classed as ‘Ultralight’ and this is encouraging the flying of R/C models in places that have never seen model flying or which have been out of bounds to flying for many years. Close scrutiny of the whole airframe and any necessary repairs and strengthening are essential before you fly the model. (h) Extra care should be taken with second hand airframes as you will usually have no idea of their history. If you are looking towards something more than a throw away airframe then an extra coat of fuel proofer in and around the nose will certainly be worth while. (g) On i/c powered models, have a good look at the fuel proofing around the engine and fuel tank bay. If this is present then it MUST be even on both wings or it’s just another warp. That is, looking from the rear the trailing edge at each wingtip is twisted upwards a little compared to the root of the wing. (f) The ONLY acceptable (and beneficial) warp on an R/C model is matched wash-out. Major warps are a reason for returning to where you bought the model. Minor warps can sometimes be removed by gently heating the covering, twisting the surface in opposition to the warp and holding until cool. (e) Always check flying surfaces for warps – don’t assume that a wing will be straight because it was built for you. The rule of thumb should be ‘if I was fitting this, would I fit this’. Most will be fine but some have been seen that were inadequate for the job expected of them, either being to thin or too weak. (d) Check pre-fitted pushrods, snakes and clevises for suitability. Follow the manufacturers instructions and when adding such things as dihedral braces make sure that the whole joint is wetted out by the glue. (c) Take particular care when gluing wing panels together. If you have any concerns then the reinforcement of many of these joints using scrap balsa stripwood will significantly increase the strength and durability of the airframe for very little weight increase. (b) All visible glue joints within the fuselage should be checked, especially the engine bulkhead, fuselage bulkheads, wing mounting plates or wing dowels, undercarriage mountings and servo mountings. Close scrutiny of even a pre-covered airframe may pay big dividends if you can prevent a future failure. (a) ARTFs are very popular and usually offer very good value for money but you should be aware that some airframes you may buy could have manufacturing or design defects.