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flaps

 
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wdaniell(at)etb.net.co
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PostPosted: Sun Jun 13, 2010 6:30 pm    Post subject: flaps Reply with quote
well i finally got my flaps assembled following the procedure in the
book....

I find that there is about 4 degrees of difference in the deflection of
the flaps.

I am assuming that this is not normal and will cause weird flying
characteristics but before I take everything to bits (for the umpteenth
time) i wanted to consult the collective wisdom about this.

Will

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pjeffers(at)talktalk.net
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PostPosted: Mon Jun 14, 2010 12:29 am    Post subject: flaps Reply with quote
Since both flaps are driven by the same motor (lever, if we are talking
Monowheel)then the only way the movement range of the two flaps can differ
is if when retracted one flap reaches its up stop (ie in the wing T/E) 4
degrees before the other. Due to the flexibility of the linking drive rod
(sorry can't remember the part no) one flap can stop prior to the other but
will end up fully retracted ie zero degrees, with the link rod slightly
twisted. Trouble is when you extend, one flap will start moving
significantly prior to the other. They both stop moving when the flap motor
stops but one will have travelled further.
If you find this to be the case then the problem is with the original flap
rigging to the drive link rod. Possibly incorrect attachment of the link rod
to the fuselage flap hinge arm.

Pete Jeffers
--

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budyerly(at)msn.com
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PostPosted: Mon Jun 14, 2010 5:57 am    Post subject: flaps Reply with quote
<?xml:namespace prefix="v" /><?xml:namespace prefix="o" /><![endif]--> Will,
Attached is a method of rigging a Europa for hands off. I never have had to add an ugly trim tab to get one to fly straight.
Some techniques provided may mean you need to order new flap brackets to get the rig right.
Usually on a new build, I use Bondo and wood shims to set the flaps perfectly rigged with the incidence board provided in the manual.
Put the wings on and check from behind. When it is perfect, then finish the hardware to make it right.
I have some experience with making silk purses out of sow's ears, and I know yours will work out.
Email if you have extraordinary difficulty.

Hope this helps

Bud Yerly
Custom Flight Creations
US Europa Dealer
Europa Tech assistance.
[quote] ---

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wdaniell(at)etb.net.co
Guest
PostPosted: Tue Jun 15, 2010 3:21 am    Post subject: flaps Reply with quote
Yup Pete thanks

the problem was a slight offset in the tube which I fixed by drilling a
third hole and enlarging the offending lower hole which caused the offset

An almost imperceptible offset on the lugs caused a 3deg difference in
the flaps which might have caused interesting flying characteristics Smile

Will

Peter Jeffers wrote:
[quote]

Since both flaps are driven by the same motor (lever, if we are talking
Monowheel)then the only way the movement range of the two flaps can differ
is if when retracted one flap reaches its up stop (ie in the wing T/E) 4
degrees before the other. Due to the flexibility of the linking drive rod
(sorry can't remember the part no) one flap can stop prior to the other but
will end up fully retracted ie zero degrees, with the link rod slightly
twisted. Trouble is when you extend, one flap will start moving
significantly prior to the other. They both stop moving when the flap motor
stops but one will have travelled further.
If you find this to be the case then the problem is with the original flap
rigging to the drive link rod. Possibly incorrect attachment of the link rod
to the fuselage flap hinge arm.

Pete Jeffers
--

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