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Old Dec 01, 2012, 01:57 PM
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Build Log

Flying Fish.....video added


I wanted to do some sort of zoomorphic airplane and after looking at birds, bats, and dragons, I came across a photo of a flying fish. The body reminded me of the fuselage on my Ki-46 Dinah. Since I already had the fuselage mold, I decided this would be a good choice.

The pectoral fins (wings) will be about 54", I'll use the pelvic fins as stabilators. At the moment, I'm thinking just AET for controls. I'll use a curved KF3 wing.

I dusted off the Dinah molds and a couple hours later I had the fuselage shells molded. I glued in a couple 3 mm bamboo rounds (from a roll up blind I found at a home center) to add some compressive strength to the tail area.
Last edited by pmullen503; Dec 17, 2012 at 06:04 PM.
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Old Dec 01, 2012, 02:40 PM
Joel K. Scholz is offline
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subscribed.
Old Dec 01, 2012, 03:57 PM
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Zen in the art of foam
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I'm flying with this fish...
Old Dec 01, 2012, 04:08 PM
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I ask a lot of questions.
This one I gotta follow
Old Dec 01, 2012, 08:31 PM
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Awesome I've always wanted to see this!
Old Dec 01, 2012, 09:12 PM
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Got the internal structure in place and the halves glued together. The shells are made from $tree foam. The weight of the 30 in long shells alone is only 26g (excluding the tape covering.) I'll leave the tape on (the tape is essentially the female mold of the forming process) until I'm ready to cover it with kraft paper and WBPU to keep it from getting too beat up.

I decided to angle the stabilators (fins) down 15 degrees. I had originally drawn them with more down angle with the idea that I could use them like an inverted V tail and get some yaw control. But that would put them in the dirt on every landing so that wasn't going to work. The current angle will keep them just off the ground. I'm hoping the plane will rock forward on landing, saving the fins. Plan B will be to add some wire skid landing gear to keep them well off the ground if they are getting too beat up.
Last edited by pmullen503; Dec 02, 2012 at 08:33 AM.
Old Dec 02, 2012, 06:59 PM
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I pulled the tape off and block sanded the fuselage smooth. Then I gave it a coat of WBPU to harden it up.

Next, I covered the fuselage with lightweight kraft paper and WBPU.
Old Dec 03, 2012, 12:57 AM
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Zen in the art of foam
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How about a slight variation on the fuselage...
(Stumbled onto this pic and just had to add it here)
Old Dec 03, 2012, 01:34 AM
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Oh no! Not another one!
(Hope you guys don't mind).
Old Dec 03, 2012, 05:44 AM
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DIY Mania from Taiwan
Loking forward to the maiden flight of your lovely flying fish
am a flying fish fun too
regards
Sam
20110626_19de2cdd186ef6b8c1d081rlNuRiaHGl_jpg_thum b
Old Dec 03, 2012, 11:36 AM
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Quote:
Originally Posted by djacob7 View Post
How about a slight variation on the fuselage...
(Stumbled onto this pic and just had to add it here)
Creepy!

Quote:
Originally Posted by djacob7 View Post
Oh no! Not another one!
(Hope you guys don't mind).
Sweet!

Quote:
Originally Posted by samwei1950 View Post
Loking forward to the maiden flight of your lovely flying fish
am a flying fish fun too
regards
Sam
20110626_19de2cdd186ef6b8c1d081rlNuRiaHGl_jpg_thum b
Cool!
Last edited by pmullen503; Dec 03, 2012 at 11:57 AM.
Old Dec 03, 2012, 12:05 PM
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This is looking to be a great build. Subscribing!
Old Dec 03, 2012, 04:43 PM
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Quote:
Originally Posted by samwei1950 View Post
Loking forward to the maiden flight of your lovely flying fish
am a flying fish fun too
regards
Sam
20110626_19de2cdd186ef6b8c1d081rlNuRiaHGl_jpg_thum b
Whatever we try, the Chinese will have done it before.

Specifications, plans, other things you care to share?
Old Dec 03, 2012, 05:25 PM
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Quote:
Originally Posted by Commander Clumsy View Post
Whatever we try, the Chinese will have done it before.

Specifications, plans, other things you care to share?
The "plan" I'm working from is in the first post. The fuselage is from an earlier build. Check that thread to find out more about the heat formed foam technique. The fuselage is about 30" long.

Wingspan will be about 54", approximately 300 sq in. Weight 16 to 20 oz. depending on the motor and battery I use. I'll pick that once I get the air frame built and see where I am on CG.

I'm kind of designing as I go but I'll try to post anything that doesn't seem obvious.
Last edited by pmullen503; Dec 03, 2012 at 07:44 PM.
Old Dec 03, 2012, 07:42 PM
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Wings


I'm making the wing from $tree foam using a standard KF3 airfoil with steps at 50% and 75%. I tested out a way to make a curved wing on my old Supercub. I did my best to break it and it held up so I'll use the same method here.

The building board is a piece of 1/4" plywood screwed to a heavier backing board with the outer 8" curved upward. The pieces are glued together on the board and weighted down with sand bags while the glue dries. The top piece was rolled over some pipe to form the leading edge before being glued down.

After the glue was set, I cut slots for the 1/8" plywood dihedral brace.


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