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Old Jul 27, 2015, 11:13 AM
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Gene,
Thanks for the tow video, in spite of my disappearing act. The Olympia does fly well, but I am going to try some more nose weight as there is still some down trim. Will put in some more info when I get to a proper keyboard--I'm not fast on a phone!
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Old Jul 27, 2015, 07:03 PM
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Where's the lift?
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United States, WA, Snohomish
Joined Mar 2001
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Nice!

Will I ever live long enough to build all of the sailplanes that turn me on? Seeing Scott's newly-completed rendition of the Charlesworth Olympia Meise this weekend had me poring over my copy of the plans again last night.

Will it bump something else on the build list? Could happen! What a nice looking glider. Must have... must have...
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Old Jul 28, 2015, 10:03 PM
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Look here, http://www.rcgroups.com/forums/showthread.php?t=2319281
starting at Post #72 for some more information on the Monroe Aerotow

I have added 3 photos below of the Olympia at that event
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Old Jul 29, 2015, 09:14 AM
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Dihedral

Scott,

It looks like flight loads bring just enough dihedral into play so that it "looks right".

Beautiful shots.

DS
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Old Jul 29, 2015, 06:46 PM
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actually, doesn't the Olympia have that dihedral built in already?
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Old Aug 12, 2015, 11:08 PM
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Dihedral

In answer to dion9146

Sorry to be a while between posts—pre- and post- extended vacation has taken some time. As for dihedral, I have pulled the information together for the Aussie Plans model I built, the Charlesworth plans that had access to original full-size Oly plans and sailplane, and the Simons 3-view from Sailplanes 1920-1945. The dihedral could be measured on the bottom of the wing or at the center of the LE. I have shown both below. The Charlesworth and Simons drawings are close enough to be called a match. All measurements were laid out together at full size on a computer drawing program.

Source / Tip Height / Degrees, bottom / Degrees, LE Center
Aussie build / 2-5/8" / 2.05 degrees / 1.7 degrees
Charlesworth/Simons / 4-1/4" / 3.3 degrees / 2.9 degrees

Conclusions:
The average Charlesworth/Simons dihedral is around 3 degrees.
The Aussie RC Plans average dihedral between methods is about 1.8 degrees.
The actual difference at each tip is about 1.2 degrees or 1-5/8", which is why the wing on my model looks a bit flat.

I have attached a scan of the Simons 3-views.
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Old Aug 14, 2015, 11:23 PM
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Tip skids and balance
For the salt flats I normally aerotow from, tip skids are a must. It's hard and abrasive and will sand a flat in the tips quickly.

For my first try, wood craft eggs were used. Cut in half, sand a little thinner, use servo tape so they can be removed easier, and put them right out on the tip. If there is a problem or I think they look too clunky, then there will be a v.2.

Our club has an aerotow tomorrow/Saturday—last weeks was rained out, again!

I have added another 2-1/3 oz of lead to the front of the battery tray to see if I can get the down trim out of the elevator. Will it fly better? Trial and error…
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