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## Re: Turbines

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• Ok Dave, spill the beans! Let s see some math. How much thrust do you need to get the Cri off the ground? And how much fuel do you need to pack to keep the
Message 1 of 4 , Mar 17, 1999
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Ok Dave, spill the beans! Let's see some math.
How much thrust do you need to get the Cri off
the ground? And how much fuel do you need to
pack to keep the thing in the air for a reasonable
amount of time?

Stephen

===============================================

---"David W. S. King" <KingDWS@...> wrote:
>
> From: "David W. S. King" <KingDWS@...>
>
> Hi All
>
> If anyone out there besides me keeps entertaining
the thought of a turbine
> Cricri
> here's another engine to look at. The smallest
engine is about 3kg and puts out
> about 120n thrust (6lbs and 25 lbs). The next one
up is 38 thrust. These are
>
SWB Turbines, Inc. - A
> Micro-Turbine Manufacturer</A>
>
> Dave
• ... You guys conspiring to wear my slide ruler out or something??? ;-] The one fellow in Belgium was running the two Amt Olympus turbine s which put out about
Message 2 of 4 , Mar 18, 1999
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At 19:24 17/03/99 -0800, you wrote:
>From: stephen chan <schan_ca@...>
>
>Ok Dave, spill the beans! Let's see some math.
>How much thrust do you need to get the Cri off
>the ground? And how much fuel do you need to
>pack to keep the thing in the air for a reasonable
>amount of time?
>
You guys conspiring to wear my slide ruler out or something??? ;-]

The one fellow in Belgium was running the two Amt Olympus turbine's
which put out about 150N or 35 lbs of thrust. I think he basically cruised
at redline. According to Amt at full throttle it burns about a pound of fuel
a minute per engine (60.8 pounds per hour). Thrust to weight is about 5.4
to 1(it's no f16 ;-]).

I think the Crystaline Jet uses the smaller Amt Pegasus which is 27lbs
135N. It's fuel burn is 200g min or about 26.4 lbs per hour. 7-1 thrust weight.

"Legally" you need 45 mins reserve+ useable fuel. If you were only planning on
hurting ear drums at airshows then you wouldn't need to worry. The BD5J only
has about 30 mins fuel. With the stock 23l tank you'd have about 25 minutes
to dry with the Olympus and about 63 minutes with the Pegasus. You could always
add a slipper tank under the belly for a few extra gals of fuel.

Now for those for you (ME!) who can't afford one of those somewhat pricey
turbines
how about a pulse jet??? 85N thrust 30L per hour fuel burn. One moving
part, painfully
loud (would be a hit at air shows...).

Cheers

Dave
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