More here:
http://www.guinnessworldrecords.com/news/2016/4/confirmed-franky-zapata-sets-new-farthest-hoverboard-flight-record-in-france-427011
If he was at close to full thrust he wouldn't
have engine out capability, which is one of the
major problems of all vertical lift aircraft.
Do the numbers. With the platform tilted at 15
degrees off vertical he still gets a vertical
thrust component of 96.6% of hover.
He also gets 26.6% horizontal component.
Presumably if he loses an engine he goes vertical and slows down.
I don't see anything impossible here.
Mike
At 06:26 PM 5/15/2016, you wrote:
In the link you posted..... a Q & A type blurb.....
About the 5th question down......
Can you tell me more about how it works? How many engines are in there?
We have four engines inside, and the power is
250 horsepower each. Itâs about 1,000 horsepower total.
I know turbine thrust is not measured in
HP....... He or his publicity did that!
I think you're being rather optimistic about the
fuel consumption....... If he is an average
75kgs, the device would have to weigh at least
30kg, if he can carry 15 litres fuel..... that's
getting up to 117 kg thrust required just to hover.
He is not on 80% thrust..... very close to full....Â
On Sun, May 15, 2016 at 5:44 PM, Mike Borgelt
<<mailto:[email protected]>[email protected]>
wrote:
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 <http://www.amtjets.com/>www.amtjets.com Â
 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......ÃÂ I
don't believe it.... he couldn't carry enough fuel.
On Sun, May 15, 2016 at 1:59 PM, Mike Borgelt
<<mailto:[email protected]>
[email protected]> 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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tel:Â Â 07 4635 5784Â Â Â Â Â overseas: int+61-7-4635 5784
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quality soaring instrumentation since 1978
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