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Wing and stab design

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TomW
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Wing and stab design

Postby TomW » Sat Jun 03, 2017 1:07 pm

I'm recovering from injury and have nothing better to do. Still a beginner on foil and have been riding a 2016 Moses Fluente with 550 and 548 wing with the 330 stabilizer.
But being a " maker" idiot, I've started building a 70cm strut for shallow spots we have. Almost done with it.

Now I've figured out a way to make a 3D printed wing ( see other thread), and want to test it.

My idea is to build a bigger slow wing for the Fluente. I'd screw it into the Fluente fuselage. I'm thinking a + 30% larger chord and + 10% span, using the T speer H105 or Eppler 817 profile.
(Edit: did some reading online, the H105 will be better at low speed and more forgiving to high AoA. High AoA will happen at low speed to get more lift to get up and flying.)

Main question is if I can use same stabilizer.?
Are these increases in size reasonable?

Yeah, I know, why would I want to do this? I'm just curious and like learning to build stuff.
Also, I thought 548 wing would be significantly different to 550, but at my level it's barely notable.

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Re: Wing and stab design

Postby Lokihel » Sat Jun 03, 2017 4:53 pm

Your stabiliser will not work very well at lower speed as the ratio of main wing to stabiliser lift will not be the same as the original design.

Increasing the size of your stabiliser by the same ratio will not give the exact result you want but should be a good starting point.

TomW
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Re: Wing and stab design

Postby TomW » Sat Jun 03, 2017 6:37 pm

Lokihel,
How do think it will behave with " too small " rear stab?

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Starsky
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Re: Wing and stab design

Postby Starsky » Sat Jun 03, 2017 8:28 pm

Ask the guy who rides without one..... I would imagine it gets a bit harder.

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Re: Wing and stab design

Postby Bille » Sat Jun 03, 2017 8:31 pm

TomW wrote:
Sat Jun 03, 2017 6:37 pm
Lokihel,
How do think it will behave with " too small " rear stab?
OR
keep the tail the same size , and move it back a few inches by making the fuse
a bit longer ; wouldn't that give it the same amount of down-force , (with less drag)
except for the increase in wetted surface aria of the fuse ?

Bille

TomW
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Re: Wing and stab design

Postby TomW » Sat Jun 03, 2017 10:17 pm

Bille,
I'm trying to avoid making all the parts.
I was looking at the Levitaz foils. They have same stabilizer and fuselage for cruiser, element and aspect front wings.

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Re: Wing and stab design

Postby max » Sat Jun 03, 2017 10:22 pm

TomW wrote:
Sat Jun 03, 2017 10:17 pm
Bille,
I'm trying to avoid making all the parts.
I was looking at the Levitaz foils. They have same stabilizer and fuselage for cruiser, element and aspect front wings.

my Zeeko foil uses the same stabiliser for the Carver wing as it does for the standard main wing and the carver is much larger.

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Re: Wing and stab design

Postby plummet » Sat Jun 03, 2017 11:59 pm

Just mate the front wing bolt it on and try it!. If there rear stab is then too small then make a bigger one.

Rear stab 60% the surface area of the front seems to be common. But stables and massive stabs have proved successful.... so ... give it a go.

The more stab you have the less lift you get out of the front wing.

So.......... the least stab you get away with and still be reasonably stable the better

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Re: Wing and stab design

Postby Mossy 757 » Sun Jun 04, 2017 6:04 pm

I'd start with the cheapest possible solution which would be to try it and shim your stab nose up or down accordingly with some thin plastic.

TomW
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Re: Wing and stab design

Postby TomW » Sun Jun 04, 2017 7:49 pm

Here is my first design for a slow speed, high lift front wing to screw directly onto my Moses set up. It has span of 600 mm and chord of 160mm, with a T Speer H105 profile.
Slowest Moses wing is 548 span and 132 Chord, with an unknown profile.
I am total and complete amateur and know just enough to kill myself.
I´m going to have to create a shim between fuselage and wing top so it fits the existing curve.
4_Hydrofoil v7 v5 Drawing v1.pdf
(131.55 KiB) Downloaded 104 times
The file enclosed is 2D pdf generated from my 3D file.


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