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HomeRC & PowerAircraftHelicopterFlybarless Rotor Head SystemsOther › Measuring Pitch (Trex 700)
04-22-2009 10:48 PM  9 years agoPost 1
Mapleleafs

rrVeteran

Ontario, Canada

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hey guys before i go do a test flight with my Trex 700 on V4, i would like to know my pitch.

i do not have a working pitch gauge as mine broke a couple months back and i threw it out.

is there any homemade method of getting a ball park number for my Trex 700's pitch?

i have heard you can move the blades parallel and measure the distance between the tips and get a degree number that way???

Vbar Trex 700N, Vbar MSH Protos 500, Vbar Logo 400

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04-23-2009 12:21 AM  9 years agoPost 2
Wogboy

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Tamworth, Australia

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04-23-2009 01:32 AM  9 years agoPost 3
Justin Stuart (RIP)

rrMaster

Plano, Texas

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Sears sells a Craftsman digital level for about $12 dollars. It is not as nice as the Wixey gauge, but it is usable. You just tape it onto your blades and it will read the pitch.

Avant RC
Scorpion Power Systems
Thunder Power RC
Kontronik Drives

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04-23-2009 01:55 AM  9 years agoPost 4
rexxigpilot

rrProfessor

Florida

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i have heard you can move the blades parallel and measure the distance between the tips and get a degree number that way???
Yes, that is how you do it. It's more accurate than a pitch gage too.

Fold blades to be parallel to each other and hold them so they are equidistant from an imaginary line that is perpendicular to the main shaft and through the spindle. Now, measure the distance between the blades at the blade tips and divide by 2. That will be the sine of the pitch angle. Measure the actual length of your blade from center of the grip blade bolt to tip of blade. That will be the hypotenuse length. Now divide the sine length by the hypotenuse length. Take the arcsine (inverse sine on a TI calculator) of this value and it will exactly equal the pitch in degrees of angle.

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04-23-2009 02:03 AM  9 years agoPost 5
Mapleleafs

rrVeteran

Ontario, Canada

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thats the answer i was looking for thanks...

Vbar Trex 700N, Vbar MSH Protos 500, Vbar Logo 400

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04-23-2009 09:32 AM  9 years agoPost 6
skint eastwood

rrApprentice

uk

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I use my iphone at the field works great

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04-23-2009 11:32 AM  9 years agoPost 7
damaen

rrVeteran

Umeå, Sweden

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It's very easy:

If the heli doesn't bog when you apply full pitch ---> Add pitch

If the heli bog when you apply full pitch ---> Add more nitro!

;-)

Henrik

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