ButtercupSTOL@groups.io

Building the Steve Wittman "Buttercup" Utility aircraft.

You'll see what it takes to build each stage .
The Building Log is easy to follow ...
Even though my version might be slightly different , (0-235 Lycoming)
the basic tools and fabrication are what you're looking for .
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I'd say the hardest part is ordering materials , parts & Hardware .
Before you build ......., buy a house near Aircraft Spruce & Specialty...
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We all want to Fly FAST and Land Slow.....Steve Wittman solved the problem
The Buttercup was built as a UTILITY Hauler...for his wife ...to run parts in his early racing days ...
She named it Buttercup .

It almost went into production as a three seater, but canceled due to WWII (read the story- PDF file in "Links")

38-40 (indicated) Slow Flight , and speeds near 150 mph on 85hp
Earl's comments about the moveable leading edge has given folks a negative view.
My view is : can he make it perform like Steve Wittman could ?
Can he jump in Andretti's car and expect the same results ? (That was a stretch)
Look at the W-10 wing in EAA museum , Steve was making one like Buttercup , moveable leading edge
Maybe he would have used his patents and installed the streamlined retractable (enclosed)For his W-10
He didn't like hitting his head on the Buttercup hinges .( out and down = Cord and Camber )
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(From the Buttercup Article by Jack Cox)
Steve checks the leading edge flaps on Buttercup. When deployed, a full span leading edge flap and a slotted trailing edge flap increase lift by as much as 100%, and reduce the stall speed by as much as 30%. This is simple technology that dates back to at least 1919, but is rarely used on lightplanes.
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It will Qualify as LSA (No Medical)


Let's build some Buttercups !!!


Example of Earl's Buttercup  :
Engine Model.................O-200
Engine Horsepower........100
Propeller.......................66/55
Cruise Speed.................125 mph
Top Speed.....................145 mph
Landing Speed................40 mph
Maximum Speed(Vne)...150 mph
Stall (clean)......................51 mph
Rate of Climb.............550 ft./min
Gross Weight............1290 Pounds
Empty Weight............790 Pounds
Payload.....................500 Pounds
Wing Span....................29'5"
Wing Area....................132 sq.ft.
Aircraft Length.............19' 6"
Fuselage Height............Cabin 44"
Fuel Capacity..............20 Gallons
Seats 2..............(side-by-side)
Cabin Width..................40"
Takeoff Distance............300 feet
Landing Distance...........200 feet
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See the Building Log at "WINGS FORUM"
Wittman Aircraft section - easy to browse
(registration "answer" - gotta fly )

   http://www.wingsforum.com/viewforum.php?f=320


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