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Forward Swept Wings



 
 
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  #1  
Old October 1st 03, 03:31 AM
Canuck Bob
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Default Forward Swept Wings

I am working slowly on an evolving Fly5k design and considering a
swept forwrd wing. Does anyone know anything about thier design?
Also would anyone have experience with the Sisler Cygnet, Andreasson
BA-7, or Pottier's Bleu Citron designs. The Cygnet seems to be well
thought of but I don't know any owners or pilots that actually flew
one.

I've learned that mild forward sweep (less than 5 degrees)is not much
different than a standard wing. A tapered wing with lots of forward
sweep is prone to twist its tips upward under load so must be
torsionally rigid. I am sticking with the simple rectangular wing
planform and sweep of 3-4 degrees max.

This allows a compact mid wing and with a 30% C spar location the
pilot sits on the c of g with the mac moved forward slightly (app. 1/2
the amount of forward sweep).
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  #2  
Old October 1st 03, 01:40 PM
Fitzair4
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This summer their was a large ad in Trade-A-Plane about the production
equipment
auction on the ARV1 Super 2 certified airplane.
I always liked this plane because of its forward sweep mid-wing. It had
excellent visibility
up and down. They had it at Oshkosh for many years.
Anyone know why this plane was never successful in sales? It was built
out of all Aluminum.

It was designed in Europe and certified. Then a company in Canada had it.
Then the rights to Minnesota, then to some where in Ohio. I don't know if
any one bought it
at the auction.

A picture of a ARV1
http://www.planecheck.com/images/2480/ARV.jpg

I have gotten a letter this summer from a person in England that had one
for a couple year
and never had any complaint about it. He sold it, because he has many
planes and a Helicopter
to play with.

Has any one in this group flown a ARV1, that can give some good advice of
this plane
flight performance qualities.

Larry Fitzgerald

  #3  
Old October 1st 03, 05:19 PM
Orval Fairbairn
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Default

In article ,
(Fitzair4) wrote:

This summer their was a large ad in Trade-A-Plane about the production
equipment
auction on the ARV1 Super 2 certified airplane.
I always liked this plane because of its forward sweep mid-wing. It had
excellent visibility
up and down. They had it at Oshkosh for many years.
Anyone know why this plane was never successful in sales? It was built
out of all Aluminum.

It was designed in Europe and certified. Then a company in Canada had
it.
Then the rights to Minnesota, then to some where in Ohio. I don't know
if
any one bought it
at the auction.

A picture of a ARV1
http://www.planecheck.com/images/2480/ARV.jpg

I have gotten a letter this summer from a person in England that had one
for a couple year
and never had any complaint about it. He sold it, because he has many
planes and a Helicopter
to play with.

Has any one in this group flown a ARV1, that can give some good advice
of
this plane
flight performance qualities.

Larry Fitzgerald



The probable reasons for so little interest:

1. Looks -- it has a face only its designer would love.

2. Performance -- probably Kitfox performance.

3. Cost/performance/value -- Van's RV series wins here, all the way
across the board!
  #6  
Old October 1st 03, 08:26 PM
Kevin McCue
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Default

A friend of mine has a Cygnet. Nice plane to fly w/excellent viz. Very
stiff wing on this plane, due to geodesic construction. Also the reason it
gets away with a single lift strut.

--
Kevin McCue
KRYN
'47 Luscombe 8E
Rans S-17 (for sale)




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  #8  
Old October 1st 03, 11:28 PM
Dave Hyde
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Default

Canuck Bob wrote:

I am working slowly on an evolving Fly5k design and considering a
swept forwrd wing. Does anyone know anything about thier design?


A little bit g
Like you say, a little forward sweep can get the spar out of the
way in the cabin. The big thing you have to work out is the potential
for structural divergence - the natural twist of the wing tends to
increase AOA, making the twist increase, etc...so you'll have to
make it stiffer than a straight or aft-swept wing.

Dave 'aeroelastica' Hyde

  #9  
Old October 2nd 03, 01:27 AM
Bill Daniels
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Default


"Paul Lee" wrote in message
om...
If you change a design to different wing sweep, don't forget
that it will move the center of lift in the direction of
sweep and it may significantly alter W & B and permissible CG
range position.

That depends on whether you sweep the tips forward or the roots
backwards.(Grin)

If the purpose is to move the wing spar carry-through structure aft of the
cockpit, the forward sweep is likely to leave the center of lift right where
it would be with the spar going through the cockpit with a straight wing.

Bill Daniels

  #10  
Old October 2nd 03, 01:32 AM
BD5ER
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Default

the natural twist of the wing tends to
increase AOA, making the twist increase, etc...so you'll have to
make it stiffer than a straight or aft-swept wing.


And you might need a bit more than normal dihedral..............

IMHO the added weight needed for the stiff wing would be worth it for the added
visibility and cockpit room on a recreational aircraft.

Take a look at the Marske site for some ideas on forward swept wing design.

http://www.continuo.com/marske/

Graphlite rod is actually quite cost effective.

 




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