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January 23, 2020, 08:38:02 PM *
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Author Topic: Nightmare  (Read 255 times)
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Jastafuhrer 13
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« on: January 14, 2020, 10:52:50 AM »

My latest project is the Nightmare by Al Casano. Plans found here https://outerzone.co.uk/plan_details.asp?ID=2257 I have a soft spot for twin fins, single blade folders, and odd models. I'm building by the plan with a couple of exceptions. The accompanying article states that a 25 degree sweep was used, however the plan is actually drawn at 30 degrees. I redrew the wing and stab plans for 25. Center ribs on the wing were canted 12 degrees to get the 3.25“ dihedral. I messed up a little by gluing the wing saddles on the fuselage before tissue, so I will add some light blocking inside the top longerons to catch the tissue. So far it's been a fun and straightforward build.
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Nightmare
Nightmare
Nightmare
Nightmare
Nightmare
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Starduster
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« Reply #1 on: January 14, 2020, 11:38:11 AM »

I can't hardly wait for the flight reports!!!

Looks good, though...
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"We have done the impossible, and that makes us mighty..."
Jastafuhrer 13
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« Reply #2 on: January 17, 2020, 12:11:39 PM »

 The article states "Performance is unusually good" but my expectations are set low.  The wing is rather large at approximately 150 sq in for 28" wingspan.  The hair clips on the wing are to keep it from tipping forward while it's just sitting there.  The center of lift seems like it will be pretty far forward. 
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strat-o
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« Reply #3 on: January 17, 2020, 02:28:56 PM »

Initially I was thinking that even with the wing pretty far back it would be tail heavy but then I noticed the stabilizer area being so large, it would act more like a tandem surfaced airplane like the Mauboussin Hemiptere.  My interest is now piqued.

Marlin
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Jastafuhrer 13
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« Reply #4 on: January 17, 2020, 03:03:29 PM »

The is no CG shown on the plan so I entered the wing geometry into this calculator https://www.ecalc.ch/wingdesigner.htm to find where the approximate aerodynamic center of this configuration would be.  See attached picture.  In side view it's about where the letter "N" in Nightmare is on the plan above.   The center of the stab is farther back than it first appears on the plan.  It's no surprise that the wing saddle is oversized in length. 
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