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Sand your trailing edges

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Pedro Marcos
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Re: Sand your trailing edges

Postby Pedro Marcos » Tue Sep 11, 2018 8:45 am

tomtom wrote:
Tue Sep 11, 2018 7:59 am
Can you please send some photos how much you blunt it. Many thanks!!!

Its for pedro :)
I dont have it with me, but basically all sharp edges now have about 2mm instead of less than 1mmm and are rounded.

tomtom
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Re: Sand your trailing edges

Postby tomtom » Tue Sep 11, 2018 1:12 pm

Performance... But i think its possible to make profile which will be optimized for blunt TE /squared one/. It will be next step - now we have almost all we desire from performance and handling POV, so what we want next is same performance but less knife like :) Also no sharp edges.

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Re: Sand your trailing edges

Postby tomtom » Tue Sep 11, 2018 1:29 pm

Pedro Marcos wrote:
Tue Sep 11, 2018 8:45 am
tomtom wrote:
Tue Sep 11, 2018 7:59 am
Can you please send some photos how much you blunt it. Many thanks!!!

Its for pedro :)
I dont have it with me, but basically all sharp edges now have about 2mm instead of less than 1mmm and are rounded.
Many thanks! One more question :)
Rounded edges of wing or rounded TE itself?

Mossy 757
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Re: Sand your trailing edges

Postby Mossy 757 » Tue Sep 11, 2018 2:37 pm

tomtom wrote:
Tue Sep 11, 2018 1:29 pm

Rounded edges of wing or rounded TE itself?
Safe, slow, draggy.

Square trailing edge is good for speed and reducing vibration. Sharp is slow and noisy, rounded is slow and ??noisy?

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Re: Sand your trailing edges

Postby tomtom » Tue Sep 11, 2018 3:28 pm

:)

Anything slower than stock 633 is NO-GO

mcfly777
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Re: Sand your trailing edges

Postby mcfly777 » Mon Sep 17, 2018 8:26 pm

I just sanded my trailing edges and noticed no loss in performance, and no noise/resonance.

leo

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deniska
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Re: Sand your trailing edges

Postby deniska » Mon Sep 17, 2018 9:17 pm

mcfly777 wrote:
Mon Sep 17, 2018 8:26 pm
I just sanded my trailing edges and noticed no loss in performance, and no noise/resonance.

leo
I really don't understand: if there is no performance loss and everything becomes quieter and safer, how come manufacturers don't make TEs blunt/sanded on the factory?
what gives?

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Re: Sand your trailing edges

Postby jyka » Mon Sep 17, 2018 9:21 pm

deniska wrote:
Mon Sep 17, 2018 9:17 pm
mcfly777 wrote:
Mon Sep 17, 2018 8:26 pm
I just sanded my trailing edges and noticed no loss in performance, and no noise/resonance.

leo
I really don't understand: if there is no performance loss and everything becomes quieter and safer, how come manufacturers don't make TEs blunt/sanded on the factory?
what gives?
"noticed no loss in performance" = there can be, and probably is some loss but it is so minor he didn't notice it.
I have also sanded trailing edge of my rl-boards foil mast and "I feed much safer now" :D Didn't notice any difference in performance. It was sharp like a knife

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Pedro Marcos
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Re: Sand your trailing edges

Postby Pedro Marcos » Mon Sep 17, 2018 9:28 pm

I believe that in low to medium aspect wings you can sand almost all you want that the performance loss will be minimal. On race wings not really.

mcfly777
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Re: Sand your trailing edges

Postby mcfly777 » Mon Sep 17, 2018 10:38 pm

That's why i was specific in the use of "notice" word. As I'm not a racer looking for the ultimate performance, the way it rides now is good enough for me, but there may be a loss of performance, though not major.
Leo


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