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Old Mar 09, 2006, 01:03 PM
Hangin.
Ojai California
Joined Feb 2006
1,178 Posts
Discussion
Forward swept slope wing?

Hey,

Has anyone made a forward swept sloper? If so, how did it fly?
Im thinking of making one just to see if I can get it to fly. Are there any advantages to a forward swept wing? I know Yaw stability will be an issue but I think a well sized VS should fix most of that.
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Old Mar 09, 2006, 01:11 PM
It could happen...
InTheLift's Avatar
Torrance, California
Joined Jan 2004
7,538 Posts
Yup...

http://www.dream-flight.com/alula.html

Not the first...and not going to be the last. There is a new FSW design in beta testing right now...should be pinging the boards with reports soon.
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Old Mar 09, 2006, 01:23 PM
Where's the wind?
the_canuck's Avatar
United States, CO, Denver
Joined Jun 2004
5,903 Posts
I messed around with forward swept plank wings for a while, but gave up. Too hard to get the cg correct. I could get one speed to work well, say high speed, but then low would hyperstall alot. If I moved the cg back to get rid or reduce the hyperstall, it would tuck at high speeds. Adding a bit of reward sweep sovled the problems and also allowed less balancing weight to be needed. Maybe it was an airfoil problem, but just got tired of building bad flying planes and added some reward sweep. LE planform started out looking like a 'W' on the original Lumberjack protos.

I've got pics in my Gallery of the original protos.
www.canuckengineering.com

Andrew

Andrew
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Old Mar 09, 2006, 01:32 PM
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SchiessCo's Avatar
North Hills
Joined Nov 1999
6,073 Posts
Does this mean the straight-edge proto didn't work out so well, or are you thinking ahead to the next project?

Pete
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Old Mar 09, 2006, 01:32 PM
more casual than stylish....
slopemeno's Avatar
Joined Jan 2003
7,076 Posts
Lets not forget the Toucan.
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Old Mar 09, 2006, 01:51 PM
agony sweetns the victory
atjurhs's Avatar
Any Flying Field Across America
Joined Jul 2005
3,539 Posts
Here's one I'm working on:

http://www.rcgroups.com/forums/showp...6&postcount=52

Initially I am developing it for e-powered flight, but if/when I get it dialed in, it will migrate over to the slopes
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Old Mar 09, 2006, 02:08 PM
Who's your Slope Daddy !
DSSlopeGuru's Avatar
Alta Vista Ca
Joined May 2003
379 Posts
Kinda something like this???

Ill keep ya updated T.J.
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Old Mar 09, 2006, 04:31 PM
NY Slope Dog
Wind Junkie's Avatar
Syracuse, NY
Joined Sep 2003
824 Posts
I have one of Larry Renger's Toucan designs too. It is the one Dave Garwood reviewed for MAN so I didn't build it.

It's heavy and fast, but not as good as a Zipper for overall slope-ability.

The forward sweep design touted an ability to avoid tip stalling and have controllable ailerons into the stall -- especially if the split elevator/aileron option is used, which I have.

Mine was never really light, so I didn't see the point in trying to slow it down and make tight turns at low speed, but at 42" it really isn't that efficient anyway.

That Alula looks like a great platform to feature the best traits of a forward swept wing. The writeup in QEFI looked pretty interesting.
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Old Mar 09, 2006, 04:37 PM
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NWade's Avatar
Seattle, WA
Joined Aug 2005
692 Posts
I've decided I'm just "different" from everyone else. I don't mind wings that can tip-stall a little, so long as I'm aware of it. I don't want them to have a tip-stalling *tendancy* - but there seems to be this fear out there that a plane that *can* tip-stall will somehow jump up and bite you someday out of the blue like some wild animal...

When it comes to sweep, I like a Delta-shaped leading edge with a straight trailing edge - it lets you "mush" the plane better at low speeds and high angles of attack.

By contrast, the forward-sweep wings seem to have a sharper stall-break. Instead of the tip stalling first, the whole wing stalls all at once.

Of course, having said this, I do have to also mention that the Alula is a cool plane, especially with the 3-surface version that the RC Soaring Digest folks came up with!
( http://www.rcsoaringdigest.com/ )

Take care,

--Noel
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Old Mar 09, 2006, 05:07 PM
It could happen...
InTheLift's Avatar
Torrance, California
Joined Jan 2004
7,538 Posts
Quote:
Originally Posted by NWade
I've decided I'm just "different" from everyone else.
Well I coulda told you that!

Wasn't there a larger version of the Toucan produced at one point too? And the Moth has some forward sweep at the chord line, no?
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Old Mar 09, 2006, 06:40 PM
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willin's Avatar
In my Blu heaven! near Lincoln NE
Joined Mar 2003
2,000 Posts
Don't forget the Bird of Prey!
http://www.rcgroups.com/forums/attac...chmentid=53624

Robert
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Old Mar 09, 2006, 07:00 PM
Crikey never leave beer behind
steve wenban's Avatar
Mt Annan Sydney Australia
Joined Dec 2003
23,507 Posts
the Zipper did one awhile back

here's one Glenn did
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Old Mar 09, 2006, 09:09 PM
Registered User
So-Cal
Joined Apr 2004
539 Posts
Had a chance to fly an alula the other day. I've flown many different deltal wings and planks and the thing I liked about it was its ability to float and thermal tight.

The other thing that I thought was cool was the amount of stability during an induced hyperstall w/ full up elevon, was really easy to use that in itself as a form of glideslope control for landing. Might have something to do w/ the extremely light wing loading but the forward sweep helped too.

Ryan
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Old Mar 20, 2006, 07:04 PM
__Jackass Savant__
theBOZman's Avatar
United States, CA, Oxnard
Joined Feb 2005
2,492 Posts
I have a speed400 forward swept that I'm going to convert to slope. I'll probably have it done this weekend. If I see you, I'll give you a couple measurements to make your own....

Best forward swept wing I've flown...Should make a fun sloper with the right tricks. I'll show you when I see you.

Boz*
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Old Mar 21, 2006, 08:28 AM
Registered User
Joined Feb 2004
337 Posts
Denny Maize of polecat fame makes a one design with forward swept wings that flys good, says you cant tip stall it. I think it looks good too!
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