Bob,
I don't know where the 250HP each engine comes from.
I'll post this analysis again:
Jet engines aren't usually quoted as being of a certain horsepower.
It seems likely the device has 4 x 40 Kg(392N)
THRUST engines (if it has a single engine out
capability this would be about right. One not
huge bloke, the device and some fuel). The only
horsepower being developed in the hover is in the exhaust stream.
From www.amtjets.com the Titan engine has 40Kg
thrust. Mass flow is quoted at 0.66 Kg/sec . Note
that this is over 0.5 cubic meters of air a second.
To get 40 Kg thrust this equates to an exhaust
velocity of 600 meters/sec. The POWER in the
exhaust stream is then around 120 kilowatts or about 160HP.
4 engines = 640 HP. He's likely at 75% thrust in the hover though.
The power being delivered to Frankie's device in
hover is ZERO. Power delivered = velocity x thrust.
Fuel consumption of the titan is quoted at just
over 1 Kg/Minute. So for 4 at say 80% thrust in
forward flight around 3.2 Kg/minute or 4 litres/minute.
He says he didn't exceed 55mph on the Guiness
record flight. Say he averaged 60 kph. He flew
just over 2.2 km so it would take 2 to 2.5
minutes. Say 10 litres of fuel. Easy.
Mike
At 05:22 PM 5/15/2016, you wrote:
Claimed 4 engines at 250hp each..... just not
possible from jets of that size....
possibly 250 N thrust from each.
claims to be looking at 2 miles...... I don't
believe it.... he couldn't carry enough fuel.
On Sun, May 15, 2016 at 1:59 PM, Mike Borgelt
<<mailto:mborg...@borgeltinstruments.com>mborg...@borgeltinstruments.com>
wrote:
Some more detail on the hoverboard. It has an
autostab system and can tolerate one engine out.
<http://www.theverge.com/2016/4/15/11439798/franky-zapata-racing-jet-powered-flying-hoverboard-interview>http://www.theverge.com/2016/4/15/11439798/franky-zapata-racing-jet-powered-flying-hoverboard-interview
Mike
Borgelt Instruments - design & manufacture of
quality soaring instrumentation since 1978
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