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Originalmente inviato da simone76  ...niente di meglio che seguire le istruzioni allegate  |
http://manuals.hobbico.com/osm/10-15-25-25la-manual.pdf
ADVICE ON SELECTION OF FUEL
Use a good quality commercial fuel or one of the blends
shown in the table. Fuel "A" is suitable for running-in and
ordinary use. Fuel "B" is for use when more power is required
and for improved flexibility. Note that even a small quantity
of nitromethane (3-5%) will improve flexibility, making the
needle-valve adjustment less critical and improving throttle
response. Use only materials of the highest purity. Synthetic
oils are permissible but are less tolerant of a "lean run" than
castor-oil. If, therefore, a synthetic lubricant is used in the
fuel, readjust the needle-valve to a slightly richer setting, as
a safety measure, in case the fuel/air mixture becomes too
lean through maneuvers in flight. If a higher nitro fuel is used,
the engine should be checked out to make sure that it is
sufficiently run-in to operate on that particular fuel without
overheating. Do not use fuels containing less than 18%
lubricant.
A B
Methanol 75% 65%
Castor Oil 20% 20%
Nitromethane 5% 15%
RUNNING-IN ("Breaking-in")
All internal-combustion engines benefit, to some
degree, from extra care when they are run for the first
few times - known as running-in or breaking-in. This is
because the working parts of a new engine take a little
time to settle down after being subjected to high
temperatures and stresses. However, because O.S.
engines are made with the aid of the finest modern
precision machinery and from the best and most suitable
materials, only a very short and simple running-in
procedure is required and can be carried out with the
engine installed in the model.The process is as follows:
1) Start the engine and, with the throttle fully open,
open the needle-valve an extra half turn (180˚)
from the optimum setting. This will produce a rich
mixture that will result in cooler running. Allow the
engine to run out a full tank on the ground. (Avoid
dusty surroundings.)
2) Now fly the model with the needle-valve re-set 2030
degrees open from the optimum setting ( i.e.
40-60˚ from the highest rpm setting ).
3) Close the needle-valve very slightly on successive
flights so that the engine is running on its optimum
needle setting at the fifth or sixth flight.