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HomeAircraftHelicopterBlades and Night Flying › Prototyping new Blades, Care to Add Your 2Cs
08-26-2013 07:39 PM  5 years agoPost 1
icanfly

rrElite Veteran

ontario

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What I have now are some 300, 500, and 700 templates, all in that order, in millimeters tip to tip. Nothing too unusual, but I was interested in what your thoughts on the better leading edge design was, round blunt? or like most offerings in all sizes knife edge?

Blunt gives lift but that might be less important on a symmetrical blade. Knife edge sounds like less drag because it is slicing through the air not whipper snippering it.

I remember seeing a net page on making blades and cog and all that know how stuff, wish I could find it again.

Recent messing with a stock set of 325's netted a airtime gain of 3 added minutes and quieter operation. That's a gain of 160 percent doods. Timed it twice and the 2200mah 11.1v battery didn't even beep the low voltage alarm when I landed. Came by accident, who'da figgered. So I'm taking the blade design thing a little more seriously.

what do you thingk?

Here's a few profiles to consider,

there's only so many ways to skin a cat so they say. The quietest blades seem to be sharp tip as there's no pressure impact from the blunt leading edge but lift can suffer. Hard to dispute lift when it's benefits are canceled due to the symetrical nature of a 3d blade .

I've heard guys talk about blades doing this and that noise, performance, strength, 3d-ability or not, speed, etc. My familiarity with plastics has taught me plenty, and this is no "amateur" attempt at a project of professional undertaking. Picking up where I left things as a young boy with a mind that matters.

Whatever benefits I get from any developments will be passed on to you in one form or another.

My "Ultimate goal" will be to fly a rc heli at mach numbers, dagnabbit, silly rabbit, do-able uh huh, .

(Somebody asked for 1400mm blades? I can make em)

naca 12 seem the common foil,

http://www.google.ca/imgres?imgurl=...ved=0CEEQrQMwCw

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09-20-2013 12:42 PM  5 years agoPost 2
icanfly

rrElite Veteran

ontario

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on my own ehh?

Looks like most heli foils are the NACA 0012 all the same.

tanks for nuddin

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09-24-2013 11:40 AM  5 years agoPost 3
jbiter

rrKey Veteran

Sebring, FL

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I am by no means an aerodynamic expert but, a sharper leading edge on an airfoil will stall sooner than the blunter edge. I would suspect the knife edge blades may not perform as well for 3D

Jeff

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09-26-2013 01:32 AM  5 years agoPost 4
icanfly

rrElite Veteran

ontario

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OH yea? That's nice to know. I had a pair of thin foil blunt tip blades, generic hk's, that worked very well. There was a time I reversed the blades with trailing edge first. They had a lot of drag that I could not figure. The motor could not turn them as freely as the normally mounted blades.

There's a few problems with certain aspects of the standard heli blade and one of them is the counter weight.

Here's a pic of the root only, the counter weight is the same weight, two and two?

this tells me that your counter weights are installed to counter just this part of the root. After drilling a set of blades closer to the center I found them to be more stable compared to normal. I'm also listening to the ambient sound from a set of blades in air and determining if what we hear is actually the blade humming from it's harmonics and not the air or a combination of both.

However, a small experiment by flying the heli up a bit, then dropping it in a fall and putting full collective at the last second netted an absolute silent moment when I suspect the updraft behind the blades known as "wake" was pushed far enough downward to clear the other blade in rotation.

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