How much faster w/o slats?

[[email protected]]

Howdy,

The Zenith Aircraft CH701 is a neat little two place STOL machine that employs
leading edge slats that are permanently deployed. Top speed for the little
machine is 95 mph.

Any idea of how much faster it might be if the slats were removed?

Anyone ever tried this?

thanks,
tom pettit

[Gig Giacona]

> wrote in message
...
> Howdy,
>
> The Zenith Aircraft CH701 is a neat little two place STOL machine that
employs
> leading edge slats that are permanently deployed. Top speed for the
little
> machine is 95 mph.
>
> Any idea of how much faster it might be if the slats were removed?
>
> Anyone ever tried this?
>
> thanks,
> tom pettit

I'd ask over at the Matronics Zenith list or even search the archive. Who
knows it might not fly at all.

[clare @ snyder.on .ca]

On Thu, 5 Feb 2004 13:11:33 -0600, "Gig Giacona"
> wrote:

>
> wrote in message
...
>> Howdy,
>>
>> The Zenith Aircraft CH701 is a neat little two place STOL machine that
>employs
>> leading edge slats that are permanently deployed. Top speed for the
>little
>> machine is 95 mph.
>>
>> Any idea of how much faster it might be if the slats were removed?
>>
>> Anyone ever tried this?
>>
>> thanks,
>> tom pettit
>
>I'd ask over at the Matronics Zenith list or even search the archive. Who
>knows it might not fly at all.
>
IIRC the question was asked of Chris at one of our chapter meetings,
and the difference was something like 5 - 10 mph and the stall speed
went up by about 1.5 times that difference.
The Pegazair has retracable slats and goes something like 15mph
faster.

[Ben Haas]

"Gig Giacona" > wrote in message >...
> > wrote in message
> ...
> > Howdy,
> >
> > The Zenith Aircraft CH701 is a neat little two place STOL machine that
> employs
> > leading edge slats that are permanently deployed. Top speed for the
> little
> > machine is 95 mph.
> >
> > Any idea of how much faster it might be if the slats were removed?
> >
> > Anyone ever tried this?
> >
> > thanks,
> > tom pettit
>
> I'd ask over at the Matronics Zenith list or even search the archive. Who
> knows it might not fly at all.


It will not fly at all. The leading edge slats are the proper airfoil
and with out them the leading edge of the wing itself won't cut it.
There are two ways to get around this. One is to modify the existing
slats to make them retractable, kinda like Pegasus did in Canada. The
draw back to this is if you get into some turbalance and one deploys
and one doesn't the plane is close to uncontrollable. Or keep them in
a fixed position and on known long distance cross country flights take
some helicopter tape and seal off the top, bottom or both openings.
Just remember that the spectacular take offs are disabled doing this.

Ben Haas N801BH Zenith 801 builder...

[Jan Carlsson]

When using automatic slats it is commen to have an connection between them
so they act parallell. (they also have dampers)

I have been flying the French MS Rallye 880 - 893 alot, and don air-tow of
gliders (with the 180HP -893) towing in turbulant air around 75-80 MPH make
the slats "pop" in and out, others it is no problema.
in"free" flight you just pass that speed, faster or slower.

Jan Carlsson
www.jcpropellerdesign.com

"Ben Haas" > skrev i meddelandet
om...
> "Gig Giacona" > wrote in message
>...
> > > wrote in message
> > ...
> > > Howdy,
> > >
> > > The Zenith Aircraft CH701 is a neat little two place STOL machine that
> > employs
> > > leading edge slats that are permanently deployed. Top speed for the
> > little
> > > machine is 95 mph.
> > >
> > > Any idea of how much faster it might be if the slats were removed?
> > >
> > > Anyone ever tried this?
> > >
> > > thanks,
> > > tom pettit
> >
> > I'd ask over at the Matronics Zenith list or even search the archive.
Who
> > knows it might not fly at all.
>
>
> It will not fly at all. The leading edge slats are the proper airfoil
> and with out them the leading edge of the wing itself won't cut it.
> There are two ways to get around this. One is to modify the existing
> slats to make them retractable, kinda like Pegasus did in Canada. The
> draw back to this is if you get into some turbalance and one deploys
> and one doesn't the plane is close to uncontrollable. Or keep them in
> a fixed position and on known long distance cross country flights take
> some helicopter tape and seal off the top, bottom or both openings.
> Just remember that the spectacular take offs are disabled doing this.
>
> Ben Haas N801BH Zenith 801 builder...

[clare @ snyder.on .ca]

On Fri, 6 Feb 2004 12:27:30 +0100, "Jan Carlsson"
> wrote:

>When using automatic slats it is commen to have an connection between them
>so they act parallell. (they also have dampers)
>
>I have been flying the French MS Rallye 880 - 893 alot, and don air-tow of
>gliders (with the 180HP -893) towing in turbulant air around 75-80 MPH make
>the slats "pop" in and out, others it is no problema.
>in"free" flight you just pass that speed, faster or slower.
>

On the Pegazair, the slats are individual, and independent. They pop
in and out as required, and are NOT anything near uncontrollable.
>Jan Carlsson
>www.jcpropellerdesign.com
>
>"Ben Haas" > skrev i meddelandet
om...
>> "Gig Giacona" > wrote in message
>...
>> > > wrote in message
>> > ...
>> > > Howdy,
>> > >
>> > > The Zenith Aircraft CH701 is a neat little two place STOL machine that
>> > employs
>> > > leading edge slats that are permanently deployed. Top speed for the
>> > little
>> > > machine is 95 mph.
>> > >
>> > > Any idea of how much faster it might be if the slats were removed?
>> > >
>> > > Anyone ever tried this?
>> > >
>> > > thanks,
>> > > tom pettit
>> >
>> > I'd ask over at the Matronics Zenith list or even search the archive.
>Who
>> > knows it might not fly at all.
>>
>>
>> It will not fly at all. The leading edge slats are the proper airfoil
>> and with out them the leading edge of the wing itself won't cut it.
>> There are two ways to get around this. One is to modify the existing
>> slats to make them retractable, kinda like Pegasus did in Canada. The
>> draw back to this is if you get into some turbalance and one deploys
>> and one doesn't the plane is close to uncontrollable. Or keep them in
>> a fixed position and on known long distance cross country flights take
>> some helicopter tape and seal off the top, bottom or both openings.
>> Just remember that the spectacular take offs are disabled doing this.
>>
>> Ben Haas N801BH Zenith 801 builder...
>

[Stu Fields]

Seems like a bad question. If you are interested in speed you are looking
at the wrong A/C to start with.
stu fields safar helicopter.
> wrote in message
...
> Howdy,
>
> The Zenith Aircraft CH701 is a neat little two place STOL machine that
employs
> leading edge slats that are permanently deployed. Top speed for the
little
> machine is 95 mph.
>
> Any idea of how much faster it might be if the slats were removed?
>
> Anyone ever tried this?
>
> thanks,
> tom pettit

[[email protected]]

Nope,
The basic mission I'm wanting to accomplish is ariel viewing of interesting
terrain, the ability to land on dirt roads, and low cost. On the very seldom
cross country flight, if I could mess with retracting or removing the slats to
get there a little faster, that would be a reasonable use of my time. 99
percent of the time I wouldn't care if it flew only 60 knots.

Besides, I'm a curious sort, and have been wondering what sort of penalty the
slats incure.

tom


>Seems like a bad question. If you are interested in speed you are looking
>at the wrong A/C to start with.
>stu fields safar helicopter.
> wrote in message
...
>> Howdy,
>>
>> The Zenith Aircraft CH701 is a neat little two place STOL machine that
>employs
>> leading edge slats that are permanently deployed. Top speed for the
>little
>> machine is 95 mph.
>>
>> Any idea of how much faster it might be if the slats were removed?
>>
>> Anyone ever tried this?
>>
>> thanks,
>> tom pettit
>
>