Author Topic: Deweybirds: the Final Chapter (Read 2984 times)

Larry Lindburg · « **on:** January 05, 2012, 09:58:33 PM »

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.

Larry Renger · « **Reply #1 on:** January 05, 2012, 11:08:26 PM »

Hmmm, with that tank it'll be a short flight, but a merry one!

minnesotamodeler · « **Reply #2 on:** January 06, 2012, 08:27:13 AM »

45's will be none too long, depending on how fast you want to spin. Power of that .061 will amaze you.

Larry Lindburg · « **Reply #3 on:** January 06, 2012, 08:44:42 AM »

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?

john e. holliday · « **Reply #4 on:** January 06, 2012, 09:05:42 AM »

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.

fred krueger · « **Reply #5 on:** January 06, 2012, 11:28:49 AM »

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

wwwarbird · « **Reply #6 on:** January 06, 2012, 09:58:29 PM »

Neato Larry!

louie klein · « **Reply #7 on:** January 07, 2012, 07:54:05 AM »

Larry, nice job! I wish we could get those fuel filters again.--LOUIE

Larry Lindburg · « **Reply #8 on:** January 07, 2012, 06:45:31 PM »

That is a Dub Jett filter. It is the narrowest filter I have seen. It is still available according to the Jett Engineering website.

minnesotamodeler · « **Reply #9 on:** January 08, 2012, 06:36:48 AM »

Quote from: Larry Lindburg on January 06, 2012, 08:44:42 AM

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.

George · « **Reply #10 on:** January 09, 2012, 06:38:21 PM »

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

Larry Lindburg · « **Reply #11 on:** January 09, 2012, 09:07:46 PM »

By the way those dark colored fins seem not to conduct electrical current to that little Merlin head.

John Rist · « **Reply #12 on:** January 10, 2012, 09:07:48 AM »

Quote from: Larry Lindburg on January 09, 2012, 09:07:46 PM

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.

minnesotamodeler · « **Reply #13 on:** January 10, 2012, 04:22:40 PM »

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"?!?!?!

Bill Adair · « **Reply #14 on:** January 10, 2012, 05:26:31 PM »

I have a NIB Norvel .049 with AME porting, and a Revlite cylinder! It's the only one I've ever seen.

Bill

wwwarbird · « **Reply #15 on:** January 10, 2012, 08:27:46 PM »

Would the dark part be titanium?

Larry Renger · « **Reply #16 on:** January 11, 2012, 10:57:46 AM »

No, the dark part is "hard anodized" Aluminum. I don't know what makes some anodizing harder than others, perhaps someone will enlighten us.

wwwarbird · « **Reply #17 on:** January 11, 2012, 07:09:55 PM »

Didn't really think so, just thought maybe.

John Rist · « **Reply #18 on:** January 11, 2012, 07:45:23 PM »

More info on Anodizing

http://www.electrohio.com/Finishing/AlAnodizing/AlAnodizing.htm

George · « **Reply #19 on:** January 13, 2012, 06:09:09 PM »

Quote from: Larry Renger on January 11, 2012, 10:57:46 AM

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

GGeezer · « **Reply #20 on:** January 14, 2012, 05:24:20 PM »

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.