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Building Tips and technical articles. => 1/2 A building. => Topic started by: Larry Lindburg on January 05, 2012, 09:58:33 PM
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Though I prefer OK Cubs, Testors, and Coxes, I decided to use something different on my final Deweybird. Since I use 42 foot lines with the Coxes, I might try 45's on this one.
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Hmmm, with that tank it'll be a short flight, but a merry one! LL~
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45's will be none too long, depending on how fast you want to spin. Power of that .061 will amaze you.
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The engine is a Big Mig .049, and the tank is two-thirds of an ounce. I'll use 15% Sig Champion fuel. Prop is 5.5-2 APC spinning 18000-19000 rpm. Anyone have an idea of the duration with this?
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With that tank sitting that far from the engine and to the outside, it looks like you may have to set a little rich on the ground. Anyway I like the looks of the plane. H^^
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Sweeeet!
You might try 42' lines. I'm flying my 150 Ringmaster (also .049 Big Mig powered) on 42' with 5x3 APC prop. I tried the 5.5x2 and liked the 5x3 a touch better.
It will move out briskly! You should make the Beginner pattern, maybe close to the whole pattern. 3/4 oz. on 25% gives me time for the whole pattern.
Fred
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Neato Larry! y1
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Larry, nice job! I wish we could get those fuel filters again.--LOUIE H^^ H^^ D>K
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That is a Dub Jett filter. It is the narrowest filter I have seen. It is still available according to the Jett Engineering website.
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The engine is a Big Mig .049...
Huh...must be quite a variation on these things. Every one of my .049s have "silvery"cooling fins MOL the same dia. as the crankcase...all but one of my .061s have the dark-anodized oversize fins per your engine; the one exception uses the smaller fins (as does my AP Wasp)--so I know some .061s use the smaller fins, but I had never seen an .049 with the larger fins. Live and learn.
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The "silvery" ones were the earlier nickel plated ones. The later ones are the aluminum oxide anodized "Revlite" ones. If I remember correctly, Big Migs (.049 and .061) came in Revlite but I THINK the AME's did not.
George
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By the way those dark colored fins seem not to conduct electrical current to that little Merlin head.
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By the way those dark colored fins seem not to conduct electrical current to that little Merlin head.
The black fins are probably black anodize aluminum. Anodizing does not conduct electricity.
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This is true. Save a lot of frustration, ya hafta make contact with the head itself.
I wonder how many people with Kwik Klips have branded them "unstartable"?!?!?!
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I have a NIB Norvel .049 with AME porting, and a Revlite cylinder! It's the only one I've ever seen.
Bill
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Would the dark part be titanium?
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No, the dark part is "hard anodized" Aluminum. I don't know what makes some anodizing harder than others, perhaps someone will enlighten us.
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Didn't really think so, just thought maybe.
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More info on Anodizing
http://www.electrohio.com/Finishing/AlAnodizing/AlAnodizing.htm
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No, the dark part is "hard anodized" Aluminum. I don't know what makes some anodizing harder than others, perhaps someone will enlighten us.
If I understand correctly, hard anodizing actually fuses the aluminum oxide with the aluminum. It is not just a coating.
George
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The only difference between regular type II (less than .001") anodizing and Type III hardcoat is the thickness of the oxide layer. Special process controls are needed to produce coatings between .001" and .005" (type III).
Orv.