stunthanger.com
Vendors Corner => PDK LLC Laser Cut Kits => Topic started by: pat king on March 20, 2016, 10:25:05 AM
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This airplane is based on the P-47 Stunter designed by Bill Werwage. It has an improved wing size as recommended by Chris Rud. The wing has 2” less span and 3/4” more chord. The airplane has a 61 1/8” span and 719 square inches of wing area. The airplane is designed for .60 to .67 size engines. The laser cut kit comes with full size CAD plans that have full size templates of all parts. The kit does not include any control system hardware. If you would like a less expensive profile version of a World Championship airplane then this one is for you. The first kits will sell for $245.00 plus shipping for a 6 X 6 X 36 box weighing 5 pounds from zip 60449
Pat
The price went up. I underestimated the cost of these kits.
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Another great offering Pat, if I could only have the time to build everything I'd like to.
One thing I notice every time but can't figure out, why is it that no one ever gets the wingtip outline anywhere near right with the P-47 designs? I know we're not building scale here but... ???
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Wayne,
The tips match the Werwage P-47. I don't know why they are not the same shape as the full scale airplane. The tips on my 1/2A P-47 are scale.
Pat
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Do you sell just the plans ?
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Allan,
Full size .pdf files of any of my airplane plans are $5.00 delivered to your inbox.
Pat
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Wayne,
The tips match the Werwage P-47. I don't know why they are not the same shape as the full scale airplane. The tips on my 1/2A P-47 are scale.
Pat
Yup, I'd noticed that too, just thinkin' out loud. ;D
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Admit it. You just like to rattle my cage to get my reaction. ;D
Pat
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This airplane is based on the P-47 Stunter designed by Bill Werwage. It has an improved wing size as recommended by Chris Rud. The wing has 2” less span and 3/4” more chord. The airplane has a 61 1/8” span and 719 square inches of wing area. The airplane is designed for .60 to .67 size engines. The laser cut kit comes with full size CAD plans that have full size templates of all parts. The kit does not include any control system hardware. If you would like a less expensive profile version of a World Championship airplane then this one is for you. The first kits will sell for $190.00 plus shipping.
Pat
Does it have the same tail volume as Billy's design ?
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Does it have the same tail volume as Billy's design ?
The shapes of the empennage are lifted out of the files for the P-47 that Chris Rud is selling as Werwage and Son. Other than the wing span and chord the all the shapes are from the files for the built-up stunter. If the chord on the ribs is scaled to match the built-up stunter the rib profiles are no more .015" off of the rib shapes of the built-up stunter.
Pat
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Allan,
If you are asking about the Tail Volume Coefficient, as calculated by the following formula:
Tail Volume Coefficient
Tail Volume = (Tail Area/Wing Area) X ( Tail Arm/Wing Avg. Chord) where:
Tail Area = area of the horizontal stabilizer
Wing Area = area of the wing
[both areas include that encased by/covered by the fuselage]
Tail Arm = distance from LE of wing to LE of stab [for untapered surfaces; for tapered, use LEs at average chord]
Wing Avg. Chord = area / wing span
Billy's airplane TVo = 0.24131
The profile airplane TVo = 0.22465
Pat
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Pat are you sure about that, typicall stunt TVC numbers are closer to .4-.5
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Pat are you sure about that, typicall stunt TVC numbers are closer to .4-.5
Mark,
The formula uses the area of the horizontal stabilizer. If the same calculation is run using the area of the entire horizontal tail the numbers would be larger. The number for the profile airplane is .39247 if the calculation uses all of the horizontal tail.
Pat
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Pat,
respectfully, The formula as I was taught is defined differently
the Horizontal stab area by definition INCLUDES the elevators
the second portion is
(the distance from the CG to the center of the stab[what you call the tail arm]) divided by the MAC
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I just stick to the eyeball and tape measure formulas. ;D
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Mark, hold on you will see this plane in action it will have one of my K 77 engines in it
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Pat,
respectfully, The formula as I was taught is defined differently
the Horizontal stab area by definition INCLUDES the elevators
the second portion is
(the distance from the CG to the center of the stab[what you call the tail arm]) divided by the MAC
Mark,
I was not taught any formula for tail volume coefficient because I am a Mechanical Engineer, not an Aeronautical Engineer. When I searched for a method to calculate Tail Volume Coefficient I found several formulae. I will re calculate when I get a chance. Right now I have to do some reading, investigation, then write a proposal for a potential client. The design consulting takes precedence over airplane or boat design.
Thanks, Pat
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Mark,
I was not taught any formula for tail volume coefficient because I am a Mechanical Engineer, not an Aeronautical Engineer. When I searched for a method to calculate Tail Volume Coefficient I found several formulae. I will re calculate when I get a chance. Right now I have to do some reading, investigation, then write a proposal for a potential client. The design consulting takes precedence over airplane or boat design.
Thanks, Pat
Hey Pat, hope you understand I am just trying to be helpfull, a TVC of .220 with flaps is pretty meager so it made me wonder, especially when you calculated Billy's at .240,, mOst modern designs are above .450 . I was shown this by Pat Johnston and others. there is some relevant discussion on here if you do a search for "TVC"
Walter, I look forward to seeing it with a High zoot engine in it,,
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Mark,
No offense taken. As I am not an Aero E I don't know about such things. I will do the constructions and calcs before the weekend is over.
Thanks, Pat
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Bumping this up to help answer a question.