In article ,
says...
Some disadvantages a fuel can catch fire,

Have you ever seen the inferno a huge stack of batteries can generate?

the engine
is very hot,

How hot is it? They put these things inside model helicopters and
other model aircraft, so it must be manageable.

have to figure out fuel routing and fuel
tanks,

Doing this has got to be a lot easier than figuring out where to put
the batteries, which will occupy much more space and weigh far more.
Motorglider builders solved this decades ago.

very noisy,

What does it sound like? I've never heard one. Worse than a DG 400?
Worse than a small/big/huge dirt bike?

needs interesting engine instruments,
needs overhaul, may be damaged by FOD (rocks and such
in intake).

If mounted on top of the fuselage, it shouldn't be any worse than a
propeller.

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Eric Greenwell
Richland, WA (USA)