GP Super Skybolt: incidences ect - RC Groups
Apr 11, 2003, 03:55 AM
mk
mk
Guest

# GP Super Skybolt: incidences ect

I'm a little unsure about measuring wing incidences.
On the GP Super skybolt can I ass.u.me that the plank lines in the fuse are
parallel with the thrust line? How would I gauge this otherwise? TLAR? na
So I set the plane at 0*
data says set top wing at -1* stab at +1.5*
Do I assume that the bottom wing is at 0*?
Can I measure incidence all along the wing to find any twist?
TIA
mk

Apr 11, 2003, 03:55 AM
pergande
pergande
Guest

# Re: GP Super Skybolt: incidences ect

A friend I fly with has the Skybolt, he's told me that everything is set a 0
degree on his, I have two biplanes as well and both of them were set at 0
degree as advised by the manufacture.
Another ole timer that flies at our club's airfield says its always best to
set all the incidence at zero .......he says they will fly better, without
any bad chararistics, as in climbing without any control
--
Bob Pergande
"mk" <mjmwcsKILLERCHAOS@htcomp.netREMOVE> wrote in message
news:v99f3umh4o5d15@corp.supernews.com...
> I'm a little unsure about measuring wing incidences.
> On the GP Super skybolt can I ass.u.me that the plank lines in the fuse

are
> parallel with the thrust line? How would I gauge this otherwise? TLAR? na
> So I set the plane at 0*
> data says set top wing at -1* stab at +1.5*
> Do I assume that the bottom wing is at 0*?
> Can I measure incidence all along the wing to find any twist?
> TIA
> mk
>
>

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Apr 11, 2003, 03:55 AM
rcflier@iinet.net.au.pigs
rcflier@iinet.net.au.pigs
Guest

# Re: GP Super Skybolt: incidences ect

On Wed, 9 Apr 2003 20:11:22 -0500, "pergande" <pergande@hcis.net>
wrote:

>A friend I fly with has the Skybolt, he's told me that everything is set a 0
>degree on his, I have two biplanes as well and both of them were set at 0
>degree as advised by the manufacture.
>Another ole timer that flies at our club's airfield says its always best to
>set all the incidence at zero .......he says they will fly better, without
>any bad chararistics, as in climbing without any control

The reason the top wing on biplanes is often at a negative incidence
relative to bottom wing is evidently to make it stall last. I have
been told a top wing stalling first causes more probs than the other
way round.

Yes you can use incidence meters to measure incidence along the wing.
If you have washout your tips should reflect that washout as negative
incidence relative to the root.

I usually sandbag my plane and attach my 3 incidence meters to the
surfaces I am interested in.
Bob Tomlinson
Aussie RC'er and Rugby fanatic

rcflierNOT@iinet.net.au

You know what NOT to remove to email.
Apr 12, 2003, 04:00 AM
Mathew Kirsch
Mathew Kirsch
Guest

# Re: GP Super Skybolt: incidences ect

"mk" <mjmwcsKILLERCHAOS@htcomp.netREMOVE> wrote in message news:<v99f3umh4o5d15@corp.supernews.com>...
> I'm a little unsure about measuring wing incidences.
> On the GP Super skybolt can I ass.u.me that the plank lines in the fuse are
> parallel with the thrust line? How would I gauge this otherwise? TLAR? na

Unless you were very careful to make sure the planking lines were
parallel to the thrust line when you built the airplane, no.

I, myself, have not found a reasonably reliable way of locating the
thrust line on a plane that does not have a flat fuselage surface
parallel to that thrust line. I'd be interested in knowing how to
locate the thrust line when you have no reliable base to measure from
too.

> So I set the plane at 0*
> data says set top wing at -1* stab at +1.5*
> Do I assume that the bottom wing is at 0*?

You can measure relative incedence that way. Set the plane so the
bottom wing is at 0, then set the top wing at -2.5. However, that
doesn't mean the wing is at +1.5 to the airplane.

I believe if you set the plane so the horizontal stab is at whatever
incedence they show on the plans, then set the bottom wing at +1.5 and
the top wing at -1, then the three surfaces will be properly aligned.
However, this does not mean that the surfaces are properly aligned to
the fuselage. If the stab is at 0, the bottom wing at +1.5 and the top
at -1, but the fuselage is at -10, the plane is going to look stupid
in the air.

> Can I measure incidence all along the wing to find any twist?

Sure, that's a pretty common practice, AFAIK.