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Tailwind-List Digest: 0 Msgs - 12/20/13

 
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fjmelick(at)aol.com
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PostPosted: Sat Dec 21, 2013 9:00 am    Post subject: Tailwind-List Digest: 0 Msgs - 12/20/13 Reply with quote

Can the W-10 fit the LSA category if I use an 85 hp continental the same as the original W-8?

Is the stall speed of the w-10 wing lower than the w-80 wing?

Thanks Fred M


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gerry.vandyk(at)shaw.ca
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PostPosted: Sat Dec 21, 2013 11:13 am    Post subject: Tailwind-List Digest: 0 Msgs - 12/20/13 Reply with quote

Hi Fred. The question has been asked here many times. Keep in mind the Tailwind is a serious hot rod, even with low power. That's the way Mr. Wittman designed airplanes, and the legacy is celebrated by the this group's members. It's a little like asking if you can make a Shelby Cobra into a slow car.

Have a look at other light sport airplanes that push up to the full 1320 lb weight limit. They're typically around 130 square feet of wing area, the W-10 is 100 square feet. My quick calculations show that it would have to be built somewhere around 950 pounds max take weight to make the maximum stall speed. That's a big ask with the existing airplane.

You could re-work the design with a larger wing, a different airfoil, lighter wing without plywood sheeting, (dual wing struts needed) etc. Then again it's already been done for you. Wittman's earlier design the Buttercup is already LSA compliant. Earl Luce sells the plans.
http://luceair.com/replica_buttercup.html

The lines aren't quite the same as the Tailwind, but you could easily make the same changes to the lower longerons, top forward tubes and cowl that Jim Clement has made. His Buttercup looks a great deal like a Tailwind.
http://groups.yahoo.com/neo/groups/TailwindForum/conversations/messages/56532

For the most part, those who have asked your question here before appear to have no interest in doing a Buttercup but it's by far the best way to go. It's highly impractical to make the Tailwind stall slow enough and keep it's top speed within the regs. Speed is determined by the airframe much more than the horsepower.

I hope this helps your deliberations.
Gerry

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tailwind222(at)yahoo.com
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PostPosted: Sat Dec 21, 2013 11:45 am    Post subject: Tailwind-List Digest: 0 Msgs - 12/20/13 Reply with quote

The stall speed is a little slower with the W 10 wing, but not even close to the landing speed needed to qualify. The Buttercup can qualify. George


On Saturday, December 21, 2013 12:18 PM, Gerry van Dyk <gerry.vandyk(at)shaw.ca> wrote:

Message Hi Fred. The question has been asked here many times. Keep in mind the Tailwind is a serious hot rod, even with low power. That's the way Mr. Wittman designed airplanes, and the legacy is celebrated by the this group's members. It's a little like asking if you can make a Shelby Cobra into a slow car.

Have a look at other light sport airplanes that push up to the full 1320 lb weight limit. They're typically around 130 square feet of wing area, the W-10 is 100 square feet. My quick calculations show that it would have to be built somewhere around 950 pounds max take weight to make the maximum stall speed. That's a big ask with the existing airplane.

You could re-work the design with a larger wing, a different airfoil, lighter wing without plywood sheeting, (dual wing struts needed) etc. Then again it's already been done for you. Wittman's earlier design the Buttercup is already LSA compliant. Earl Luce sells the plans.
http://luceair.com/replica_buttercup.html

The lines aren't quite the same as the Tailwind, but you could easily make the same changes to the lower longerons, top forward tubes and cowl that Jim Clement has made. His Buttercup looks a great deal like a Tailwind.
http://groups.yahoo.com/neo/groups/TailwindForum/conversations/messages/56532

For the most part, those who have asked your question here before appear to have no interest in doing a Buttercup but it's by far the best way to go. It's highly impractical to make the Tailwind stall slow enough and keep it's top speed within the regs. Speed is determined by the airframe much more than the horsepower.

I hope this helps your deliberations.
Gerry

[quote]
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