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Old Nov 05, 2005, 11:19 PM
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Build Log
another supra build - the slow way

Thought I'd share another Supra build.... at a little slower pace than the molded one.

If you want to build your own, see the plans here:
http://www.charlesriverrc.org/articles/supra/supra.htm

I'm building two Supras over the winter. One for me, and one for a friend.

Here are some photos of one completed rudder.
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Last edited by JonStone; Dec 06, 2005 at 07:53 AM. Reason: resized photos
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Old Nov 05, 2005, 11:28 PM
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A few photos of the 2nd rudder in progress. I decided to add .060 carbon rods to the vertical fin of both. Why? Tom Kiesling did it, and I liked the idea. But after building one, and thinking how that "highly sheered" kevlar works to reduce bends, the rods are probably not needed. Weight penalty of the .060 rods is about 1.5 grams, plus a little glue.

On the first rudder, I glued the rods in when bagging with very little epoxy. This one, I glued them in ahead of time and applied a little putty.

In the photo below, you can see the edges are rounded, and have been sanded back to airfoil shape. It is ready to be vacuum bagged. The cloth is cut out & waiting, too.
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Old Nov 05, 2005, 11:44 PM
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Cores for both planes came from Laszlo Horvath at http://www.compufoamcore.com/

Here are a few photos of raw stab cores, just to show how they are when I get them.
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Old Nov 05, 2005, 11:54 PM
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Load of kevlar pieces. 1.0 oz kevlar, Clockwise from upper left are pieces for wingtips , stabs, and rudder. Takes a long time to cut out all that cloth. Each piece of cloth is attached to wax paper with an extremely light mist of 3m77 before cutting it out with a pattern.
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Last edited by JonStone; Dec 06, 2005 at 07:59 AM. Reason: resized photos
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Old Nov 06, 2005, 12:31 AM
4 wheels move a body; 2 a soul
Saratoga, Ca
Joined Feb 2004
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Thanks Jon, your build thread, at least for me, is greatly appreciated.
Looking forward to watching your progress this winter! I am not familiar with
the weights that can be obtained, by an experienced person, building your own Supra. Think Ive heard anywhere from 41 to 64 ounces RTF, is that correct? Is it true this plane was designed to best fly at really low weights/wing loadings?
Keep up the good work.
Walter
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Old Nov 06, 2005, 05:40 AM
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Thanks for the thread! I will be following this one with interest.

Aki
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Old Nov 06, 2005, 06:58 AM
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All I can say is ...YIPEE!

Rob - aka Lucky Friend
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Old Nov 06, 2005, 08:35 AM
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Quote:
Originally Posted by glderguy
Think Ive heard anywhere from 41 to 64 ounces RTF, is that correct? Is it true this plane was designed to best fly at really low weights/wing loadings?
Mark's original Supra weighs 48oz. Kiesling's Models weigh 58oz and 64oz. Mine weigh 62oz.

For mark's comments on the effects of weight read this thread.
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Old Nov 06, 2005, 10:12 AM
4 wheels move a body; 2 a soul
Saratoga, Ca
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Oh yeah, forgot about that thread, thanks Phil.
walter
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Old Nov 06, 2005, 10:14 AM
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No problem getting under 55 oz even with a stronger spar, 2" more span and a heavier boom. My light one is now under 53 ounces. I never ballast over 10 oz. so a molded Supra would be for maximum wind conditions only. 41 ounces would be great, but I don't see how it could be done.

Using a Walba boom and my new pylon pod, another 1.5 ounces can be taken out. Jon, are you using the Walba boom?
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Old Nov 06, 2005, 10:28 AM
4 wheels move a body; 2 a soul
Saratoga, Ca
Joined Feb 2004
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Badger, do you sell the pods or do you just make them for yourself? If you do
make them commercially, could I get the info needed to purchase one? I have been thinlking about dusting off the equipment and bagging up a Supra for some time now. Jons build thread may be the catalyst to get it started. Building the wings for me isnt an issue, cutting a plug, making molds for a fuse is.
Thanks, Walter
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Old Nov 06, 2005, 12:21 PM
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Sorry, I don't sell pods. I will acknowledge that the majority of my molding information has come from this site, so it isn't that hard.

There are others who sell pods and booms, including Kennedy I think.
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Old Nov 06, 2005, 12:27 PM
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Quote:
Originally Posted by JonStone
Today's work was on the stabs.
I suggest sanding a flat spot into the balsa on one side, where it sits on the V-mount platform. This will reduce or eliminate the need for potting the stab against the V-mount so it sits tight without rocking.
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