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Author Topic: Waco SRE by Earl Stahl  (Read 1456 times)
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marcin_pl
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« Reply #25 on: December 31, 2021, 01:31:19 PM »

Time for covering. I used Esaki tissue for the first time. It's different than a material being selled in Poland under a name "japanese tissue". "Our" japanese tissue is more porous, with distinctive fibers. It has no wet strenght and is shrinked by a shrinking dope.
Esaki was a new experience to me so before putting it on the model I made some test frames. I was afraid of a shrinking force, which could deform delicate structures. After the tests I decided to use Esaki on stronger parts: fuselage and wings and a thinner Kashmir tissue on the stabilizers. Esaki was shrinked with water from atomizer (I was a bit afraid of it but it went OK). All parts got two layers of mixture of 50:50 shrinking and non-shrinking dope.
So far so good and now all the elements except the fuselage are attached to a building board for at least a week.

Marcin
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marcin_pl
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« Reply #26 on: December 31, 2021, 01:31:45 PM »

I prefer to trim my models by setting a horizontal stab angle. Typically I use small slivers of ply, balsa or cardboard and put them under leading or trailing edge of the stab respectively. But after reading MKelly build log about his Waco I decided to use his idea of a "regulator" with a small plastic screw. It turned out easier than expected and works brilliant! Additional weight can be neglected but a stab angle can be set with stellar accuracy.

Marcin
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kaintuck
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« Reply #27 on: February 13, 2022, 07:07:06 AM »

Very nice! Your building skills are terrific.......should be a nice plane, please keep us informed.
Marc
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Crabby
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« Reply #28 on: February 13, 2022, 10:13:41 AM »

Hi Marcin, I have that plane on my bucket list just for pleasures' sake. I have my Dad's which he flew indoors, it is the Mooney peanut scale SRE. I will check out the decalage today, I can attest to its solid flying.
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The Threadkiller!
Konrad
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« Reply #29 on: February 13, 2022, 11:10:25 AM »

I prefer to trim my models by setting a horizontal stab angle. Typically I use small slivers of ply, balsa or cardboard and put them under leading or trailing edge of the stab respectively. But after reading MKelly build log about his Waco I decided to use his idea of a "regulator" with a small plastic screw. It turned out easier than expected and works brilliant! Additional weight can be neglected but a stab angle can be set with stellar accuracy.

Marcin
For RC gummy band conversion I like to set my decalage at 0.5° (up trim using the wing chord line as the datum). This often ends up being parallel with the bottom of the wing if it has any Philips entry in the airfoil.

Note; I do like a rather aft CG.
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Cut it twice and it's still too short!
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