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Sky writing



 
 
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  #11  
Old July 14th 04, 03:18 PM
Bushy
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While on a smaller scale, the local model shop rc guru said I should mount
the ten dollar extra cylinder cooling water jacket they sell for rc cars to
the fins of the head of my motor and their twenty dollar smoke kit which
was a bit of high temp tubing and a servo operated valve that squashed the
tubing to cut off flow. Pressure is supplied to the tank via a tapped
fitting to the motor crankcase that required removing the back plate
drilling and tapping a hole and inserting the fitting. This was to suit an
OS46, so it wasn't a large rc motor.

Heating the oil prior to injecting it gave more smoke. I do not know if this
would help on most airshow type high powered display aircraft, but would
expect some sort of preheat would give much more smoke on a smaller, lower
horsepower aircraft. This could be as simple as leaving the drum of oil out
in the sun (or on the combustion stove in Alaska) before filling your smoke
oil tank.

Hope this helps,
Peter


"Jim Fisher" wrote in message
...
"Viperdoc" wrote in message
A smoke system includes a tank, pump, and orifice in the exhaust

manifold.
This system allows the smoke oil to get vaporized.


So is the oil is injected directly into the manifold through this orifice

or
is there some more complicated, separate mechanism for heating up the oil?

--
Jim Fisher




  #12  
Old July 14th 04, 04:20 PM
Morgans
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"Bushy" wrote in message
...
While on a smaller scale, the local model shop rc guru said I should mount
the ten dollar extra cylinder cooling water jacket they sell for rc cars

to
the fins of the head of my motor and their twenty dollar smoke kit which
was a bit of high temp tubing and a servo operated valve that squashed the
tubing to cut off flow. Pressure is supplied to the tank via a tapped
fitting to the motor crankcase that required removing the back plate
drilling and tapping a hole and inserting the fitting. This was to suit an
OS46, so it wasn't a large rc motor.

Heating the oil prior to injecting it gave more smoke. I do not know if

this
would help on most airshow type high powered display aircraft, but would
expect some sort of preheat would give much more smoke on a smaller, lower
horsepower aircraft. This could be as simple as leaving the drum of oil

out
in the sun (or on the combustion stove in Alaska) before filling your

smoke
oil tank.

Hope this helps,
Peter


Many differences, between model smoke, and full size smoke, and even big
model smoke, and that mainly is the heat available.

Small model engines run on nitro methane, and the alcohol does not burn as
hot, giving low quality smoke. The larger gas engines for models have
plenty of heat. So do the big planes, even too much heat, while running
wide open. (hot)
--
Jim in NC


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  #13  
Old July 14th 04, 05:56 PM
gatt
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"Edward Todd" wrote in message news:info-

Most likely due to its high visibility to those who would question it.

One group would protest it as destroying the sky's natural beauty,


And one more, who upon seeing you, would think you were a terrorist and
the smoke was some kind of nerve gas.


LOL! The chem-trail people.

-c


  #14  
Old July 14th 04, 09:57 PM
Viperdoc
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The oil is pumped through a small orifice into the exhaust manifold near the
outlet. The exact location can make a big difference in the quality of
smoke.


  #15  
Old July 15th 04, 10:23 AM
Capt.Doug
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"Robert M. Miller" wrote in message Also, it seems important to note that
skywriting seems to be a "dying" art.
You just don't see much of it at all these days. I'm really hoping by
bumping this thread a bit someone with a little bit more knowledge on the
matter will speak up for you.


It's not very viable as a commercial venture. A solo writer has to have
clear skies with little or no wind. It's hard to book a marriage proposal on
a specific day at a specific time while guaranteeing Mother Nature will
cooperate. Multiple airplane writing teams can work with more wind because
they can write the message quicker, before the wind distorts it. Multiple
plane writing teams are also quite a bit more expensive and they still
require Mother Nature to guarantee a clear day. Banner towing produces a
steadier stream of income.

D.


 




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