Repair on Pulsar 3.2 sailplane

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JohnOSullivan
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Re: Repair on Pulsar 3.2 sailplane

Unread post by JohnOSullivan » Mon Jan 23, 2017 12:43 pm

for the Mayfly \
Sections are based on Marl Drela's AG series for his Allegro 2m sailplane
AG35 at root 8.7% thick 2.4% camber changing to AG 36 8.2% thick, then to AG37 7.75% thick and AG38 7.0%thick at tip and 2.0% camber

Longer fuselages and smaller tails also based on Drela's ideas. Still retaining standard Vertical and horizontal tail moment coefficients.

Structure is basically the same as the Minifex but using smaller section spars and trailing edges and balsa fuselage sides compared with 1/32 ply sides on the Minifex.

The new sections allow wider speed ranges than the original Eppler 193 even though wing loading is significantly lower (~16 ozs compared to 21+ ozs of the Minifex)
Reflects the significant sailplane advances over the 30 years since I designed the Minifex.
John
MAAC #5401 L
MACI (Ireland) IRL#26

saboo
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Re: Repair on Pulsar 3.2 sailplane

Unread post by saboo » Tue Jan 24, 2017 2:42 pm

Sure sounds like a lot of rib cutting. Any of it laser cut?
Nothing like the smell of electrons in the morning ;-)

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JohnOSullivan
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Re: Repair on Pulsar 3.2 sailplane

Unread post by JohnOSullivan » Tue Jan 24, 2017 7:44 pm

Only 46 ribs per model x 3 models.
Ribs are made by the traditional Sandwich method. Stack rectangles of balsa between the two relevant 1/16"ply templates and sand on the belt sander to shape.
The first photo shows the different wing sections for the different panels. With the Sandwich method it blends the two airfoils without having to draw each transitional rib.
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P1100035.JPG
P1100059.JPG
John
MAAC #5401 L
MACI (Ireland) IRL#26

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steve
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Re: Repair on Pulsar 3.2 sailplane

Unread post by steve » Tue Jan 24, 2017 7:53 pm

Looking good John. Always nice to see balsa work.

Steve
Steve

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