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T-REX 450 › How tight should my blades be?
02-10-2008 09:10 PM  10 years agoPost 1
Opfor

rrApprentice

Loudon, Tn

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Have always wanted to know what the desired torque should be when installing my blades to the grips. I assume it has to be a bit loose so that the blades can lead/lag in flight but how loose? Should they be able to fall to the side if I pick the heli up or should they remain in place?

Does anyone have a good rule of thumb on what this should be so that I can make them both equal everytime?

Thanks

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02-10-2008 09:18 PM  10 years agoPost 2
Gyronut

rrProfessor

Martinsville In.

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Just snug them down enuf that they will stay extended when supporting their own weight.

Rick

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02-10-2008 09:38 PM  10 years agoPost 3
Boidman (RIP)

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The Home Stretch

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0.7 to 1.2 inch-pound of torque, depending on if you are using a NACA 0012 to 0014 airfoil, and if your blades fall within 18.1 to 22.9 grams. Blade planform, specifically the tip configuration, can also greatly effect the torque needed, depending on parasitic drag and vortices generation. Add-on molded Hoerner tips can greatly reduce the torque requirement, but lose most all their benefits when flying inverted. You could take Gyronut's advice, if you're lazy, since it is good enough for most folks.

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02-10-2008 10:26 PM  10 years agoPost 4
Invrted1

rrVeteran

Cincinnati, Ohio

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Wow Boidman, I have never heard such specific advice on blade torque before. Thats great
Should they be able to fall to the side if I pick the heli up or should they remain in place?
As far as I know, they should be tight enough that they will stay when held sideways.

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02-10-2008 10:31 PM  10 years agoPost 5
Boidman (RIP)

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The Home Stretch

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I go with a little shake to get the blades to fall, then a pull on each to see if they seem to have the same drag in the grips. The previous was a total fabrication.

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02-10-2008 10:35 PM  10 years agoPost 6
Invrted1

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Cincinnati, Ohio

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You really had me going there for a min. I was starting to wonder about you

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02-11-2008 02:12 AM  10 years agoPost 7
wannaflyguy

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Central, PA

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On the latest kit... 450se V2 (I just finished my build today) the blades are tight-- real tight. Made me wonder if perhaps I had done something wrong. Especially since the tail blades are so loose.

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02-11-2008 02:25 AM  10 years agoPost 8
Invrted1

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Cincinnati, Ohio

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I have heard that many times about the Align blades. I would not worry about it, they will loosen up after a few flights.

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02-11-2008 02:37 AM  10 years agoPost 9
Boidman (RIP)

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The Home Stretch

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The V2 kits came with carbon or wood blades. Unless the fit is way out of line, the grip fit can wear in, or you can speed it up by rapid blade swinging. If you have the wooden blades, you really should re-glue the plastic root pieces. Many don't, and that can cause problems later on.

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02-11-2008 03:22 AM  10 years agoPost 10
wannaflyguy

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Central, PA

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Boidman,

How do I re-glue the plastic root pieces on the woodies (Pro 325's)?

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02-11-2008 03:32 AM  10 years agoPost 11
Blade_Master1

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Canada

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Thats what I thought they come preglued don't they ?

I had wood blade sheer off

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02-11-2008 03:52 AM  10 years agoPost 12
Boidman (RIP)

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The Home Stretch

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The best 'minimum' fix would be to use one of the plastic-specific superglues (CyA) and run a small bead all around the plastic blade skin to root piece, edge. The next would be to use thin, regular superglue. Squeezing the superglue onto a pin or paperclip or small wire can be the neatest way to apply it. Optimum would be to remove the screw and very gently work the plastic reinforcement off the blade. Then scrape off the old glue for all 4 surfaces and epoxy them back, using some method to clamp them tight. The plastic is more brittle than flexible, so there are risks.

Some of us have filed the plastic to get a good fit in the grips. A bit of care should be taken to file them flat and mostly parallel to each other. A stack of wood, metal, or paper can be set on each side of the blade at the proper height to keep a file running true while filing.

From the factory, it is not unusual at all to be able to slip a fingernail very easily under an edge of the plastic. Sometimes, removing the screw will let the plastic practically fall off the blades.

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02-11-2008 04:16 AM  10 years agoPost 13
Opfor

rrApprentice

Loudon, Tn

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Thanks guys,
I will see if I can find a torque wrench that small.

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