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Home✈️Aircraft🚁HelicopterThunder TigerOther › 710mm blades on R50. Do I need metal blade grips?
07-20-2006 03:03 PM  14 years ago
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RescueHelicopter

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Portland Oregon

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710mm blades on R50. Do I need metal blade grips?
I have a stretched R50 SE that is electric. I have a streched boom to accommodate 710mm blades. Will I need metal blade grips to do this?
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07-20-2006 03:14 PM  14 years ago
Ron Henry

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Atlanta area, GA - USA

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Yes, but I wouldn't do it that personally. The spindle and head block aren't designed to take the loads that 710s are going to place on them. You'll bend spindles very regularly at a minimum or throw a grip in the worst case scenario. It's a bad idea.- Ron Henry
http://kaizenrc.com/forum
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07-20-2006 03:20 PM  14 years ago
GimbalFan (RIP)

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Big Coppitt Key, FL

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With 710's you'll probably be able to bend your spindle in just normal flight, and any semi-hard touchdown will guarantee it.

Most folks flying R50's use a metal head but leave the grips plastic to protect the other parts of the head. This includes most of the pro pilots too. You'll be fine with plastic grips.

What do you expect to gain by using blades that large?
op-thwop-thwop-thwop-thwop-thwop-thwop-thwop-thwop-thwop-thwop-thwop-thwop-t
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07-20-2006 04:15 PM  14 years ago
RescueHelicopter

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Portland Oregon

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I am using it for AP. Bend the spindle? I have heard of other people doing this. Why would it bend the spindle?
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07-20-2006 05:09 PM  14 years ago
GimbalFan (RIP)

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Big Coppitt Key, FL

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I imagine for AP it would be fine in the air. Landings are another story.

Even though you're obviously gonna be taking great care to always fly & land gently, after even a mildly hard landing you should remove one blade and turn the spindle by it's cap screw to be sure it hasn't been bent. They make the parts including the spindle just hard enough to handle the blades that are expected to be flown, and yours are quite a bit longer and heavier than that spindle is expected to support.

How many grams are those blades anyway?
op-thwop-thwop-thwop-thwop-thwop-thwop-thwop-thwop-thwop-thwop-thwop-thwop-t
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07-20-2006 05:09 PM  14 years ago
RescueHelicopter

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Portland Oregon

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This is not for 3D
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07-20-2006 05:16 PM  14 years ago
Mark C

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Houston, TX - USA

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This is mostly dependent on your headspeed.

If your headspeed is going to stay low.... say 1500rpm then the loads are very comparable to flying 600mm blades at 2000rpm under hard 3D in which case the plastic grips hold up just fine. If you are planning on flying at a higher headspeed then you should consider som nice QuickUK grips.

I would most certainly dump the plastic headblock in any case and go with a QuickUK head which is all CNC.

The all CNC parts will hold up better than the cast Mavrikk or TT parts.

Edit: If you do go with all metal head and grips then remove the teetering pin in the headblock and run hard dampners to keep from bending the spindle.

Good luck.
Mark C.
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07-20-2006 05:17 PM  14 years ago
RescueHelicopter

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Portland Oregon

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I have a metal head block. My R50 is the SE version.

I found this thread and I guess the spindel is not a problem.

http://runryder.com/t255794p1/?p=1973107#RR
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07-20-2006 05:20 PM  14 years ago
GimbalFan (RIP)

rrProfessor

Big Coppitt Key, FL

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You'll be fine in the air for your purposes but you may want to pick up a couple extra spindles anyways as spares. It's the landings that'll gitcha.op-thwop-thwop-thwop-thwop-thwop-thwop-thwop-thwop-thwop-thwop-thwop-thwop-t
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07-20-2006 05:33 PM  14 years ago
FLYINFOOL

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Cudahy, WI

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Even though it is not for 3D you can still get high flight loads due to wind gusts or turbulence. There is also the possibility that every landing might not be perfectly smooth.
That is where you may encounter problems with the stock head not being strong enough.
Jeff Borowski
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07-20-2006 06:23 PM  14 years ago
RescueHelicopter

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Portland Oregon

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Maybe I will try to contact N74DV and ask him about his landings. IF I can get ahold of him, he does not accept Emails or PMs
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Home✈️Aircraft🚁HelicopterThunder TigerOther › 710mm blades on R50. Do I need metal blade grips?
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