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HomeAircraftHelicopterMain Discussion › Pitch Gauge or Main Blade Foldback for Setting Your Coll. Pitch
11-12-2014 08:55 PM  3 years agoPost 101
KC

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WA

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Math....

Stopped using a pitch gauge about 20 years ago

For most 500+ size helis, 7 degrees is enough to climb inverted with semi-symmetrical blades, 10 degrees is enough for 3d with anything, 14 degrees is just asking for an in-flight boom-strike the moment you forget it's there.

Symmetry is easiest to achieve by making sure the angles of control rods are in the ballpark of "looks even both ways".

With most FBLs using longer fulcrum arms at the rotor grip than at the swashplate, the problem is that most FBL helis have more topside pitch than inverted pitch.

...that's until you lie to them and make the controls SLIGHTLY assymetrical through the radio: add more negative travel. The cost for doing this is that your control throw will be a little slower inverted, by an amount of time so short, not even super-man would notice.

No idea how much pitch I have...is that number important if the machine is not bogging and flies symmetrically?. I probably have somewhere around 11-12 each way maybe but my incredibly technical pitch range fits my other rule: if I climb out near full stick then to full stick and if it bogs, then it had too much collective.

Keep this stuff simple, that last bit of performance only matters if you want to go through helicopters 2x as often.

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11-12-2014 09:04 PM  3 years agoPost 102
rexxigpilot

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Florida

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Check that digital level/pitch gauge against a calibrated instrument and you will be surprised how inaccurate it really is. Just because something is digital doesn't mean it's accurate. And the number of decimal places on the display is only the readout precision which has nothing to do with the gauge's accuracy.

I use professional level/pitch gauges for my work. They are used to check for ADA compliance, storm and sewer pipe slopes, etc. They must be very accurate for this purpose. Often, I will get a reading that doesn't match the math of delta elevation divided by horizontal distance equals grade or pipe slope. I always go with the math as it is a precise method. The cheap hobby grade gauges are much less accurate than anything I use professionally. The hobby grade gauges are a waste of money and give a false sense of precision.

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11-12-2014 10:16 PM  3 years agoPost 103
Ronald Thomas

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Gainesville, Fl, USA

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Its a hobby....hobby grade is good enough. Absolute precision is not needed

Team MikadoUSA 480XXTreme, 550SX, 600SX, 700XXTreme, 800XXTreme!!

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11-12-2014 11:32 PM  3 years agoPost 104
EEngineer

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TX

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don't even use FBL electronic unit, only tail gyro
Who needs gyros?

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11-12-2014 11:46 PM  3 years agoPost 105
EEngineer

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TX

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Its a hobby....hobby grade is good enough. Absolute precision is not needed
There is no such thing as "absolute" precision.....

Precision comes with tolerances...I strive to keep my tolerances to a minimum wherever possible....

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11-13-2014 01:13 AM  3 years agoPost 106
revmix

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NJ

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Who needs gyros?
FBL has 3 of them

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11-13-2014 01:15 AM  3 years agoPost 107
EEngineer

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TX

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Yep, and they're made by Invensense.

Wait until they start using the 6 and 9 axis gyros.

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11-13-2014 01:18 AM  3 years agoPost 108
revmix

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NJ

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with built in pitch gauge

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11-13-2014 01:20 AM  3 years agoPost 109
EEngineer

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TX

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Or blade foldback calculator....

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11-13-2014 01:28 AM  3 years agoPost 110
revmix

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NJ

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better yet already set up & can't be tinkered with, so no need for thread to exchange ideas

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11-13-2014 01:30 AM  3 years agoPost 111
EEngineer

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TX

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better yet already set up & can't be tinkered with, so no need for thread to exchange ideas
Won't need math, either.

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11-13-2014 01:33 AM  3 years agoPost 112
Retired2011

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Lee's Summit, MO

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I thought a gyro was a Greek sandwich.

What is math anyway?

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11-13-2014 01:36 AM  3 years agoPost 113
revmix

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NJ

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do need math to figure out where to mount spot on tho

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11-13-2014 01:38 AM  3 years agoPost 114
Retired2011

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Lee's Summit, MO

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I NEVER mount the "spot".

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11-13-2014 01:56 AM  3 years agoPost 115
EEngineer

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TX

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do need math to figure out where to mount spot on tho
You mount your spot?

Does spot bark?....

I couldn't help it...sorry.

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11-13-2014 01:59 AM  3 years agoPost 116
Retired2011

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Lee's Summit, MO

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I'm rolling on the floor here...

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11-13-2014 02:01 AM  3 years agoPost 117
EEngineer

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TX

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He set me up.....LMAO

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11-13-2014 02:05 AM  3 years agoPost 118
Retired2011

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Lee's Summit, MO

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You didn't HAVE to take the bait!

OK maybe you did...

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11-13-2014 02:08 AM  3 years agoPost 119
EEngineer

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TX

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Spot would....

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11-13-2014 02:09 AM  3 years agoPost 120
revmix

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NJ

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LMAO
do the math about your imaginary 6~9 axis gyro
go digital and get things spot on!!

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HomeAircraftHelicopterMain Discussion › Pitch Gauge or Main Blade Foldback for Setting Your Coll. Pitch
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