# Crazy idea of the week - Scale Magister

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#### Jay Kempf

##### Curmudgeon in Training (CIT)
Since it's virtually certain that nobody here is actually going to build a little jet based off of this engine, how about we assume, for the moment, that this engine actually performs as-advertised. That is not an endorsement of the company or the product but, short of someone buying one of these engines and doing their own independent test, this sidebar argument is pointless and isn't going to be resolved here.

The thread was started by the OP with regards to designing an airplane around such an engine. That's a fine exercise, and if any of you don't believe the engine's performance, consider this a thought exercise as if that engine actually exists. Or simply don't participate. If you want to argue the merits or demerits of this engine as a topic, my first recommendation would be to do it via PM. Or start a separate thread specifically about this engine. This thread is meant to be about an airframe designed to suit this engine, on the assumption that it does what the manufacturer claims. Derailing it into an argument about the engine itself is off-topic, and further posts in that direction will be moderated.
How much range would most fit this config? That gives a weight of fuel to work with. The rest can fall in behind that.

#### Topaz

##### Super Moderator
Staff member
Log Member
How much range would most fit this config? That gives a weight of fuel to work with. The rest can fall in behind that.
Not a lot, I'm guessing. But as the OP said, this would be a toy. A fixed engine sizing would be interesting, with the range set as the fallout. Use the MTOW of the SubSonex as a starting point, and plug in the numbers for this engine.

#### Himat

##### Well-Known Member
How much range would most fit this config? That gives a weight of fuel to work with. The rest can fall in behind that.

Pretty short I guess. If the stated fuel consumption is at full power one engine consumes 52,2kg fuel in 30 minutes. If the aircraft was bee a twin thats a little more than 100kg fuel in half a hour. Then, 80kg pilot, 2x10kg engines and 100kg fuel and we are at 200kg. In some other thread it was stated that the all up wheigt shouldbe less than 3 times the thrust.

784/9,81=79,9kg times two engines times three and the all up weight arrives at 479kg. Where 200kg already is the pilot, engines and fuel. Leaves 279kg for the airframe.