Does anyone have a plan for Tonys 1/4 Scale T45 please?
I'm looking for the C of G position and an idea of the wing incidence.
At the moment Im working on the C of G being on or about the wing joiner, but any help would be appreciated, especaially a good photo of the plan showing these details.
many thanks
Paul
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Tony Slocombe's 1/4 Scale Slingsby T45 Swallow Glider
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- Cliff Evans
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Re: Tony Slocombe's 1/4 Scale Slingsby T45 Swallow Glider
https://lasercutsailplanes.co.uk
https://patteaklegliders.co.uk
https://patteaklegliders.co.uk
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- Posts: 10
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Re: Tony Slocombe's 1/4 Scale Slingsby T45 Swallow Glider
Thanks Cliff
Just what I needed.
Paul
Just what I needed.
Paul
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- Posts: 10
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Re: Tony Slocombe's 1/4 Scale Slingsby T45 Swallow Glider
Blimy.. just had a look relative to the glider fus and quite surprised just how far forward it is from the wing joiner!!
- RobbieB
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Re: Tony Slocombe's 1/4 Scale Slingsby T45 Swallow Glider
Most certainly because of the wing high angle of attack relative to the tail.
- Ian Davis
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Re: Tony Slocombe's 1/4 Scale Slingsby T45 Swallow Glider
Robbie I've never heard of the A of A being part of any C of G determination. If I've misunderstood I'll get back in my box.
Ian
Ian
- RobbieB
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Re: Tony Slocombe's 1/4 Scale Slingsby T45 Swallow Glider
Ian,
Main wing incidence, CG and tailplane incidence are all intimately connected. Change any one, then for continued level flight you must change at least one of the others.
Assuming the tailplane and the elevator are flying at zero incidence (the theoretical ideal) then increasing the main wing incidence will require a forward shift in the CG if you are to return the tail to zero incidence without the assistance of negative elevator trim which is less than ideal. The ideal tail incidence for a symetrical tailplane (and that includes the elevator, of course) is zero degrees.
All aerofoils have an optimum angle of attack designed into them but we do require them to fly at varying A of As (slower or faster) depending upon the conditions or whatever speed we want to fly at. I personally have my models rigged with the main wing set at a low A of A which facilitates a rearward CG range - but that's just my preference because for me it makes for a much nicer model to fly. Whack the main wing incidence up to three, four degrees or more then you are going to have to move the CG forward to compensate which will give you a very stable model but not a nice one to fly - particularly when circling in thermals.
Main wing incidence, CG and tailplane incidence are all intimately connected. Change any one, then for continued level flight you must change at least one of the others.
Assuming the tailplane and the elevator are flying at zero incidence (the theoretical ideal) then increasing the main wing incidence will require a forward shift in the CG if you are to return the tail to zero incidence without the assistance of negative elevator trim which is less than ideal. The ideal tail incidence for a symetrical tailplane (and that includes the elevator, of course) is zero degrees.
All aerofoils have an optimum angle of attack designed into them but we do require them to fly at varying A of As (slower or faster) depending upon the conditions or whatever speed we want to fly at. I personally have my models rigged with the main wing set at a low A of A which facilitates a rearward CG range - but that's just my preference because for me it makes for a much nicer model to fly. Whack the main wing incidence up to three, four degrees or more then you are going to have to move the CG forward to compensate which will give you a very stable model but not a nice one to fly - particularly when circling in thermals.