Myth #1 - 3 bladed props give more thrust than 2 bladed ones - Page 15 - RC Groups
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Feb 16, 2013, 02:30 PM
Grumpy old git.. Who me?
JetPlaneFlyer's Avatar
Quote:
Originally Posted by James Frolik
....Hence they attribute any misgivings or frustrations to having flown too close to the sun, which, in turn, melted their wings and caused their model to crash to the ground.
'Brown out' seems to be the most popular lame excuse for crashing these days. Strangely these 'brown-out's' seem to disproportionately happen to inexperienced flyers and most often on the final turn on landing approach
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Feb 16, 2013, 02:38 PM
Not only do they misdiagnose the problem, but then they usually attribute the "brown out" to a faulty receiver. I have even seen a case where a guy claimed that the TRANSMITTER caused it!
Feb 16, 2013, 02:55 PM
Night Flying
Ron H's Avatar
Often it is not pilot error. It may be due to an overstressed component or even servos installed backward. Can't blame that on the pilot.
Feb 16, 2013, 03:01 PM
AndyKunz's Avatar
Quote:
Originally Posted by JetPlaneFlyer
Indeed, but no one actually claimed it to be anything other than 'personal experience'. Having said that I've been flying RC since the early 70's so statistically it's highly likely that my personal experience is a 'representative sample' of the whole
I'm not debating with you, I'm using your comment as a springboard to more humor. At least, I thought it was funny. Dumb thumbs cause most of my crashes. I can only point out 3 in my 40+ years of modeling that were definitely NOT thumb (or wrist, from my C/L days) related.

Andy
Feb 16, 2013, 03:02 PM
AndyKunz's Avatar
Quote:
Originally Posted by Ron H
Often it is not pilot error. It may be due to an overstressed component or even servos installed backward. Can't blame that on the pilot.
You can if he's also the Crew Chief!

Andy
Feb 16, 2013, 03:07 PM
Registered User
Quote:
Originally Posted by Ron H
Often it is not pilot error. It may be due to an overstressed component or even servos installed backward. Can't blame that on the pilot.
In my case the component that's overstressed usually is the pilot .

But it's true that not all crashes are pilot error. Some of them are midairs and as everyone knows they're caused by "the other pilot's error" .

Steve
Feb 16, 2013, 06:29 PM
Senile Member
Lnagel's Avatar
Quote:
Originally Posted by Ron H
It may be due to...servos installed backward. Can't blame that on the pilot.
You can if it was the pilot who installed the servos, or if the pilot did not perform a proper preflight check before takeoff.

Larry
Feb 18, 2013, 01:34 PM
Stick, roger ball.
Quote:
Originally Posted by Lnagel
You can if it was the pilot who installed the servos, or if the pilot did not perform a proper preflight check before takeoff.

Larry
Done that...

Now, just like when I was flying full size aircraft, I say my pre-flight checks out loud.
Feb 18, 2013, 01:48 PM
Ascended Master
Sparky Paul's Avatar
That always pays off... and check the aileron throw from the rear of the plane!
Mar 09, 2013, 01:19 PM
Registered User
rcmaverick's Avatar
myth # 123

A motor must be warmed up prior to pylon racing, aerobatics, and 3D.
Sep 28, 2016, 03:11 PM
Registered User
Prop size, during ww2 the p47 had three blades, and its climb rate was lousy when they added a fourth blade it climbed better enough to equal or best the109 why? the clip says that 4blades work better in a climb because each blade works by itself but at level flite the props follow in their own wash making the prop less efficient. Are they right?
Sep 28, 2016, 03:50 PM
http://www.sgvhumane.org/
cmdl's Avatar
Holding all else equal, an extra blade (which is also increased load) will increase thrust.

If you're asking about equivalent props, then as you go up in blade count, holding pitch constant, you reduce diameter. For efficiency of equivalent props, see the text at the end of the page here: http://www.mh-aerotools.de/airfoils/...bladeSelection
Sep 28, 2016, 07:24 PM
Registered User
At some point you run out of room to increase diameter, at which point the only option for more thrust is to increase the pitch or add a blade. Assuming the motor is capable of delivering additional torque, a prop with more blades will produce more thrust, albeit less efficiently in regards to the amount of motor power required per unit of thrust produced.
Sep 28, 2016, 08:34 PM
Gravity sucks.
mrittinger's Avatar
Prop blade number is determined by power absorbtion requirements and ground clearance requirements. More blades absorb more power for a given diameter. However, that does not mean the y are more efficient or produce more thrust.

Wings can stall at different points. This is the whole point of washout...tip stalls after root.
Sep 28, 2016, 09:01 PM
Registered User
Quote:
Originally Posted by AndyKunz
Myth #30 - The only pilot who thinks it's NOT pilot error is the one whose plane crashed.
and they blame the radio...


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