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Old Aug 29, 2010, 08:19 PM
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melbourne, australia
Joined Feb 2009
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Question
Olympic 2

Does anyone know the exact CoG point on the Oly 2.
I am assuming it's on the spar, however I am open to
suggestions. Many thanks, Alf.
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Old Aug 29, 2010, 10:00 PM
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TLyttle's Avatar
Keremeos, BC Canada
Joined Mar 2004
2,639 Posts
Sure, start at the spar, then fine-tune it to your flying style. Same thing with wing incidence: on mine, I ended up with a 1/8 shim under the trailing edge, but that was just my experience.
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Old Aug 29, 2010, 10:15 PM
volare est vivere
ray foley's Avatar
United States, OH, Toledo
Joined Jan 2005
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hi there from Toledo

Yeah, start at the spar and then move it back as you get bolder.

Recently I reduced the incidence of the wing on my Oly II by 1/4" and also built a 28" center extension panel. I must say, what an improvement that has made, WOW!

ciao -rjf
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Last edited by ray foley; Aug 30, 2010 at 09:58 AM.
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Old Aug 30, 2010, 03:54 PM
agony sweetns the victory
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Any Flying Field Across America
Joined Jul 2005
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You don't have to worry about wing incidence if you build it with a full-flying stab, of course it's no longer Nostalgia legal, if you care about that sort of thing.
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Old Aug 30, 2010, 07:16 PM
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melbourne, australia
Joined Feb 2009
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The bird is already built, long time. I had it given to me but can't find much on the net.
The only thing I may do is build spoilers. We get some boomer thermals in Australia.
What is this about wing incidence. I didn't think it mattered on floaters.
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Old Aug 30, 2010, 07:33 PM
It's all fun till Crunch!
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InSane Diego
Joined Jan 2002
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I believe you'll need the spoilers, I love mine.

Start at the mid of the spar for CG, as I remember the incidence is only a degree or two, wing up compared to horiz stab. If it was flown successfully before it should be right on.
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Old Aug 30, 2010, 07:54 PM
Herk
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Virginia USA
Joined Jun 2007
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Here are a couple of snaps of the OLY 11 plan.
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Old Aug 30, 2010, 11:03 PM
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Keremeos, BC Canada
Joined Mar 2004
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If you are going to install spoilers, I suggest D-tubing back to the spar. Not only will the model fly better, but it will survive higher speeds. I should have put spoilers in mine, never got around to it; got out of thermals in all the usual alternative ways...

Incidence DOES matter on floaters, if one wants to have better control. If you are dealing with boomers, sometimes an extra turn of speed is very beneficial!
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Old Sep 01, 2010, 06:47 AM
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melbourne, australia
Joined Feb 2009
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Thanks to herks for the plans. I now have the CofG right on the rear edge of the spar
and it seems about right. I was actually thinking of rear edge spoilers. They have no pitch tendencies. I had an old 4.2 metre floater years ago that used to creak and groan like an
old sailing ship that had rear edge spoilers and they worked a treat.
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Old Sep 01, 2010, 12:23 PM
Thermal Naked!
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United States, AL, Mobile
Joined Dec 2007
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Creaking and groaning? That's not good in an airplane. The only thing in an airplane that should do that is the pilot.
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Old Sep 05, 2010, 11:36 PM
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melbourne, australia
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Yes, Hossfly, at my age I do more than creak and groan. This was an old ship that no
one wanted anymore, so I gave it a home. I eventually lost it when the wing joiner failed
during a rather enthusiastic winch launch. Good old glider, all the same.
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Old Sep 08, 2010, 06:06 AM
Celebrating 300 posts!
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Kirtland, OH
Joined Mar 2010
306 Posts
There's an original Airtronics Olympic II up for auction on EBay (not from me). No bids yet, ending 2.5 days from now, asking $149.

http://cgi.ebay.com/ws/eBayISAPI.dll...=STRK:MEWAX:IT
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Old Sep 09, 2010, 09:56 PM
volare est vivere
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United States, OH, Toledo
Joined Jan 2005
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hi there from Toledo

You can get a brand new Oly2 or Oly 2s from www.Skybench.com for about the same money.

ciao -rjf
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