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- Jan 22, 2013
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Anyone know how many pounds it takes for a full fill for flight of the M Contrail?
There are many kinds of bottle warmers, some I would feel comfortable with and some not.Regardless the temperature, a liquid is not easily compressed. The volume of liquid would be the same regardless of temp, correct?
To ensure a good and quick fill, I thought of using one of those 12v racers warming blankets on the bottle when filling the motor, isn't that ok?
Are you talking about getting all the liquid out of the tank? If you are using a dip tube, which most of us are, then you can only use about 90 % of it probably because the dip tube can't reach it all. That has just been my experience. So I refill my tanks when they get down to a quarter tank. That's why I would recommend at least a 20 pound tank for M size motors.Karl - what temperature and density is that at? It can vary vastly depending on those variables. I have a 75 pound tank and I can never get the last 5-7 pounds out of the tank. I do use the tanks when empty of liquid as a starter to pressurize the system then I transfer over to a tank with liquid so I can conserve some liquid.
It is very easy for your fill tank or your flight tank/rocket to reach hi temps in the summer sun. One of my ideas which I have not got around to testing is to put foam insulation between the motor tube and the main body tube to keep the motor from heating up in the sun. A hot hybrid motor is not an efficient rocket motor.Dave,
That would work if the liquid behaved like water. After ~97 degrees, nitrous is supercritical and is neither a liquid or a gas. Also, as you heat it, more of it becomes a gas and becomes a less dense liquid. When you cool it more of it becomes a liquid and less gas.
https://www.flickr.com/photos/paytonkramer/22790418098/ other rocket pictures are on Payton's aka 'the boy' flickr https://www.flickr.com/photos/paytonkramer/I've seen that video a few times- any pictures of the whole rocket? it looks cool from this angle.