Saturday, May 26, 2012
Light-Sport Aircraft Yahoo group Wingtip winglets for improved performance? Any info?
These are the vertical upward fins sometimes seen on the ends of wings commercial aircraft.
I've seen downward tips put on Piper Tripacers, which would seem to accomplish the same thing (inhibit the generation of wingtip vortices thus reducing drag.)
They are a somewhat unique modes in this respect:
Many modifications seem to have tradeoffs (bush tires: Better rough field landings, but some increased drag. Shorter wings, more speed but less climb rate, Etc.)
These (ignoring initial cost and possible complexity of installation) seem to give more speed and better fuel consumption without any real downside.
Anyone know of these one LSAs?
Know of any thought that's ever been given to this possibility?
Curious,
Alex
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Friday, May 25, 2012
Light-Sport Aircraft Yahoo group bob Ellefson??
Michigan Sport Pilot Repair
Great Sails - Sailmaker
for Ultralight & Light Sport
(989)513-3022
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Re: Light-Sport Aircraft Yahoo group Pipistrel ALPHA Trainer fuel flow
Sure we can Michael,
but only after complimenting you on 108 knots at 3.6 US-Gals/hour.
Excellent!
Mike
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Light-Sport Aircraft Yahoo group Pipistrel ALPHA Trainer fuel flow
>
> guys, I'm really starting to become worried about the ongoing
> communication and the fact that nobody ever bothers to look at the
> information presented.
>
> Please allow me to spell it out for you directly from the manual and
> give you an explanation on fuel consumption.
>
> fuel flow at cruise speed 108 knots 3.6 US gph (13.6 l/h)
> fuel flow in circuits 2.5g US gph (9.5 l/h)
>
> These details are clearly listed on the website and in the information
> pack and in the flight manual and a real figures. The fuel flow in
> circuits based on my experience is closer to 8.5 litres per hour
> instead of 9.5 litres per hour. It must be remembered that the
> Pipistrel ALPHA Trainer is extremely clean, it has no wing struts, no
> rivets nothing else in the air stream which can slow the aircraft down
> by creating drag. This design is based on a glider and pretty much the
> whole circuit from mid downwind is performed with the engine at idle so
> even though you are using full power for take off and climb to 1000
> feet AGL the moment you are on mid downwind the rest of the circuit is
> with the engine at idle, with the engine at idle and at neutral flap
> the aircraft has a glide ratio of around 20 to 1 so it is easy to see
> that the aircraft can achieve and does achieve the quoted fuel flow
> figures.
>
> Can we now please put this issue to bed.... many thanks Michael
Sure we can Michael,
but only after complimenting you on 108 knots at 3.6 US-Gals/hour.
Excellent!
Mike
.
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Thursday, May 24, 2012
Re: Light-Sport Aircraft Yahoo group Fuel Burn
Abid
--- In Sport_Aircraft@yahoogroups.com, James Ferris <mijniljj@...> wrote:
>
> You can't cruse a 747 at 70 MPH but it works good with a Luscomb and low fuel burn so I think you could 2.5 GPH with a rotex. And don't forget that lainar flow wing it will have much lower drag.
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Light-Sport Aircraft Yahoo group Pipistrel ALPHA Trainer fuel flow
Please allow me to spell it out for you directly from the manual and give you an explanation on fuel consumption.
fuel flow at cruise speed 108 knots 3.6 US gph (13.6 l/h)
fuel flow in circuits 2.5g US gph (9.5 l/h)
These details are clearly listed on the website and in the information pack and in the flight manual and a real figures. The fuel flow in circuits based on my experience is closer to 8.5 litres per hour instead of 9.5 litres per hour. It must be remembered that the Pipistrel ALPHA Trainer is extremely clean, it has no wing struts, no rivets nothing else in the air stream which can slow the aircraft down by creating drag. This design is based on a glider and pretty much the whole circuit from mid downwind is performed with the engine at idle so even though you are using full power for take off and climb to 1000 feet AGL the moment you are on mid downwind the rest of the circuit is with the engine at idle, with the engine at idle and at neutral flap the aircraft has a glide ratio of around 20 to 1 so it is easy to see that the aircraft can achieve and does achieve the quoted fuel flow figures.
Can we now please put this issue to bed.... many thanks Michael
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Re: Light-Sport Aircraft Yahoo group Ocala, FL
Thanks for the tips Ill look into them
Curt
--- In Sport_Aircraft@yahoogroups.com, John Weber <Ransfly@...> wrote:
>
> Hi Curt,
> I would suggesting checking out some of the local EAA Chapters-There are two in Ocala, 1 at Loves Landing near Weirsdale, 1 in Leesburg. Also the Florida Flying Gators are in Groveland. The Gators are a light sport group and operate out of a private grass strip. They will usually have a spring and fall fly-in. The next fly-in is November 3rd. Good luck. John Weber(in Leesburg- member EAA chapter 534 and member Florida flying Gators.)
> On May 22, 2012, at 9:49 PM, rugbugus wrote:
>
> > Id like to meet some folks in the Ocala, FL area, my wife and I would love to fly, Im currently studying my ground school subj. hoping to obtain my PPL at some point.
> > Thanks
> > Curt
> >
> >
>
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Wednesday, May 23, 2012
Re: Light-Sport Aircraft Yahoo group Ocala, FL
Hi Curt,
Id like to meet some folks in the Ocala, FL area, my wife and I would love to fly, Im currently studying my ground school subj. hoping to obtain my PPL at some point.
Thanks
Curt
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Re: Light-Sport Aircraft Yahoo group Fuel Burn
To: Sport Aircraft <sport_aircraft@yahoogroups.com>
Sent: Wednesday, May 23, 2012 10:46 AM
Subject: Light-Sport Aircraft Yahoo group Fuel Burn
> Posted by: "Robertmudd1u@aol.com" Robertmudd1u@aol.com
>
> The only way to get a Rotax to burn 2.5 GPH at cruse is to cruse
> at a low RPM and that results in a low speed.
or....
The only way to get any Aircraft engine to burn 2.5 GPH at cruise,
is to select a cruise speed at which 2.5 GPH is burned.
Yes... looks right to me. ;-)
Mike
PS:
I'm starting to think the expression "cruise speed" could be vague.
Also the expressions "normal" and "average" and "low RPM" and "low speed" and "Rotax".
.
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Light-Sport Aircraft Yahoo group Fuel Burn
>
> The only way to get a Rotax to burn 2.5 GPH at cruse is to cruse
> at a low RPM and that results in a low speed.
or....
The only way to get any Aircraft engine to burn 2.5 GPH at cruise,
is to select a cruise speed at which 2.5 GPH is burned.
Yes... looks right to me. ;-)
Mike
PS:
I'm starting to think the expression "cruise speed" could be vague.
Also the expressions "normal" and "average" and "low RPM" and "low speed" and "Rotax".
.
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Tuesday, May 22, 2012
Light-Sport Aircraft Yahoo group Ocala, FL
Thanks
Curt
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Re: Light-Sport Aircraft Yahoo group Re: perfect for my situation
It should get better tha 2.5 at a lowr cruise speed with a laminer flow wing if it gets 2.5 in touch and go.
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Re: Light-Sport Aircraft Yahoo group Re: perfect for my situation
Subject: Light-Sport Aircraft Yahoo group Re: perfect for my situation
I thought the 2.5 GPH figure was for touch and goes for training
which would be a lower speed around and around the pattern
--- In Sport_Aircraft@yahoogroups.com, Robertmudd1u@... wrote:
>
>
> In a message dated 5/19/2012 1:43:13 A.M. Mountain Daylight Time,
> mcoates@... writes:
>
> nowhere does it mention anything but these figures so if you can help me
> and find where it said in the media 2.5 gph in cruise we will get it fixed.
>
>
>
>
>
> The only way to get a Rotax to burn 2.5 GPH at cruse is to cruse at a low
> RPM and that results in a low speed.
>
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