When you say that a propeller has an efficiency of 51%, does it then mean that the efficiency losses with respect to the ideal propeller are 49%?
My answer would be NO!
Why? Because the ideal propeller will have an efficiency lower than 100%! Therefore the losses with respect to the ideal...
I don't know if I can describe it in detail, but the problem is basically as follows:
We have a gas turbine engine (420 shp turboshaft engine mostly used in helicopters). We want to use it in an experimental aircraft. The engine would drive 2 counter rotating constant speed propellers (probably...
I have a splitter bevel gearbox with shaft rotation 6000 rpm and gear pitch circle rotation speeds above 30 m/s, transmitting a power of 400 HP. According to me it would be necessary to use a dry sump oiling system with jet spray lubrication to both the gears and the bearings. With such high...
For a preliminary study on torsion vibrations of the integrated system engine-transmission-propeller I need information on both propeller and engine. The propeller is not such a problem, I can easily find the information I need in order to model it, but that is not the case for the engine.
The...
Hi,
Any RR or Allison engineers or others that could help me with these 2 questions?
1. I know that in a MD-520 Helicopter the engine (Allison Model 250 C20 Turboshaft) is installed with engine axis under 45° compressor up, while the same engine is installed in many other helicopters and...
This may be too vage of a question, but anyway.
I would like to know if a gasturbine engine can be operated in any position for any length of time. For example, if I would like to use a gasturbine engine with its axis in vertical position for x time and then bring it in another position, say...
Hi there,
I need to make a very light reservoir, the differential pressure should be 30 atmosphere, it should be very flexible and foldable when empty.
I was thinking of using a combination of Kevlar tissue in a Rubber matrix . Is this a good idea?
Would it be possible (instead of using Kevlar...
I make a simple beam model in which only stiffness and mass properties are attributed to the beams.
I would like to extract the mass and stiffness matrices for this model. How can I do this?
If possible I would like to have this data available in the F06-file?
Can anybody prove me wrong or right when I claim the following statement:
Accelerometers can be useful in measuring rotational accelerations, but it is absolutely impossible to measure translational accelerations because of the unknown direction of the gravitational field.
Onemorechance
