Originally Posted by
RadialWacko
I'm new to jets myself and in the process of building the Hawk as well.
The 100 doesn't use THAT much more fuel than the 85 per minute, but again, not much room for error with a jet and running out of fuel. I suggest you run your jet on a test stand and watch the fuel consumption yourself. It might make you change your mind. Jets really suck down fuel at an almost alarming rate. My K85 on the test stand sucked up 12 oz of fuel in 160 seconds...
Just err on the side of caution your first couple flights and see where you are at...
2L = 67.6 oz
At 12 oz / 120 sec, I figure 11 minutes of fuel. But without risking running out of fuel, I expect to be at 7 minute flight maximum with the K85.
You will find by flying with a larger engine, that your time may actually increase, verses a smaller engine. This is because most of the time, the larger engine will be running at half throttle for the given speed. The smaller engine has to run at a higher rpm to get the same speed and will actually consume more fuel for the given amount of fuel in the tank. Now, yes it is true if you fly both at full throttle for the whole flight, then the larger engine will consume more fuel. Throttle management determines the fuel consumption.