Re: Light-Sport Aircraft Yahoo group Can anyone read "Efficiency"

The John Deere solar turbine used on ground power units to supply electric power to airecraft on the ground have been used in small home build aircraft (about 100 HP) and weigh about 30 Lb.

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Subject: Re: Light-Sport Aircraft Yahoo group Can anyone read "Efficiency"

 

--- In Sport_Aircraft@yahoogroups.com, b d <gpabruce@...> wrote:
>
> Abid,
>
> I appreciate your opinion and I can accept and respect that as your opinion
> however I also respectfully disagree.
>
> Out of curiousity, why do you say "turbine engines will not be very
> efficient on LSA"? I don't agree but I'd like to hear why you think that.
>

I'll defend my rAbid little "buddy" with this statement comparing reciprocating piston engines to gas turbines.

Turbine engines produce a great deal more power for their weight than piston engines, but they burn more fuel and are much more expensive to manufacture.

Shouldn't take more than a line or two from Bruce to give a specific example of a turbine (even his so-called "scaleable" turbine) which gives higher horsepower output per pound of fuel burnt than a piston engine.

Bruce will most likely find himself striking out when the question of "efficiency" is asked in such a straight-forward manner.

Barnaby

> My opinion:
> We have many examples today of successfull power technology that can be
> scaled up or down to fit any need. Gas Turbine is only one. We know that the
> weight to power ratio fits the aviation application. We have working
> examples of heat recovery and noise elimination that would be conducive to
> light aviation (for lack of a better term for GA and LSA and UL) and even
> heavy aviation. If we combined just the knowledge and technology we already
> have and scaled it to fit the application, I believe we can have a far more
> advanced power unit than we presently have and many varieties. We have few
> choices today and that shouldn't be the case.
> I can list what we have, or what I know we have. You may know of more.
> If we were then to take that list and scale each technology to the size,
> weight and power that we need for a given aircraft (1, 2, or 4 place
> aircraft) we would see that we far more choices than are available today.
>
> I won't go into all that right now but I would be happy to explore it with
> you if you would like. We can do it off line so as not to bore the people on
> the list. It can be an interesting exercise.
>
> The main thing is to not be negative about anything and to examine
> everything objectively.
>
> Be back shortly, have to get my grandson.
>
> Bruce
>
>
> On Fri, Dec 24, 2010 at 7:44 PM, apollonorthamerica <
> apollonorthamerica@...> wrote:
>
> >
> >
> > Hi Bruce,
> > I got your point but I will tell you this as well.
> > Turbine engines will not be very efficient on LSA.
> > Battery will still store the energy and power electrical motors rotating
> > the prop. That battery may get its re-charge in a hybrid fashion whether it
> > be from an idea of Van De Graf generator or simply plugging it into the grid
> > on the ground or both or more than both.
> >
> > That will be the next step. That's just my opinion.
> > Best and Merry Christmas,
> > Abid
> >

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