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HelicopterCentury Radikal G20-30 N640 Hawk Predator › Anybody Ever Seen a Frame Like This?
01-05-2013 01:26 PM  5 years agoPost 1
Mr.Bowflex

rrApprentice

Toronto Canada

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These are the upper side frames (HI3107) I received recently from Heli-world for my hawk. Notice the left frame side is missing the counter gear shaft upper and lower bearings retaining ridges. Anybody ever seen this before? Century claims its a design from a new style 50NX frame to make it easier to replace the counter gear shaft bearings. Apparently the 50NX was updated to have an open bearing design on both frame pieces here. Any 50NX owners out their seen this on their machine? Seems kinda odd that one side is like this and the other side is normal. If your going to sell a frame set to someone, why mix old and new in the same bag? Help!

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01-05-2013 10:10 PM  5 years agoPost 2
Triggr Happy

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Ontario, Canada

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I dont recall my 50NX having that, how ever I could be wrong. Unfortunately I no longer have it to double check with.

I would forward those pictures to Century, I am sure they would send you a new frame set.

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01-05-2013 10:50 PM  5 years agoPost 3
gboden

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Chugiak, AK

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I have a 50NX frame set sitting in a box and it has retaining ridges. I suppose it is possible to be a later update but I also think that no matter what it is that you run, they both should be the same.

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01-06-2013 12:44 AM  5 years agoPost 4
RM3

rrElite Veteran

Killeen, Texas - USA

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reminds me of another Century screw up with the radikal TT option not having a tail gyro mount...go figure.

showing a preference will only get you into trouble, 90% of everything is crap...

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01-06-2013 01:59 AM  5 years agoPost 5
Gearhead

rrMaster

Vt

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I have not seen that, but I like the idea

Jim
Buzz Buzz Buzz

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01-16-2013 02:49 PM  5 years agoPost 6
MartyH

rrProfessor

USA

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Like you suggest, I think you have two different side frames. If you grind out the closed one to match the open, what holds the bearings in place.

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01-17-2013 04:34 AM  5 years agoPost 7
gboden

rrNovice

Chugiak, AK

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On the bottom is a counter gear and on top is a pinion gear. They would pinch together in the frame after assembling the frames. It might be a good design for maintenance as I have had that shaft sheer in flight. I believe it has been a trouble spot for bearings as well. They only way to replace it and the bearings was to take it all apart.

In the event of open bearing blocks like that it would be possible to replace bearings and drive shaft without taking it all apart.

Either way it is still plastic bearing blocks vs. metal, which I think, limits us to a degrade in durability over time. Plastic becomes brittle and alternately, if it spins in the seat then the plastic will wear.

I think grinding it down to match would be a hard challenge to be precise enough for a bearing seat; especially for the high speeds that the shaft runs at.

IMO, Return the frames, if you haven't already, and ask for two of the same.

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01-17-2013 07:49 PM  5 years agoPost 8
Gearhead

rrMaster

Vt

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edited
remember, that frame was made for a 28 size engine, it has held up to it's test of time even with the large 50 size engines. some one said in another post (as for plastic helis) the Raptor has been around the longest, far from the truth, that Century frame has been on the market 23 years, that's some 7 or 8 years longer than the Raptor, that's a long time in the world of RC Helis

as for the shaft, you should not have a problem with the more powerful engines if you use a drop of Red Locktite to glue the Bearings to the Shaft, and when you mount the upper Pinion Gear make sure there is no up and down play in the Shaft, I always tighten the Set Screw on the Pinion after the frame has been mated, this way I can make sure there is no up/down play

Jim
Buzz Buzz Buzz

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01-17-2013 10:02 PM  5 years agoPost 9
Mr.Bowflex

rrApprentice

Toronto Canada

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Century has sent me a replacement left side frame piece but insist this is a new design. I find it odd they would mix old with new in the same bag-if it is in fact a new design and not an error.

However, there are some benefits to this frame. It makes it easier to do the third bearing mod as half the frame has already been prepped, and the frame is higher in this area and will give more support for the second 5x13x4 bearing.

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01-27-2013 09:53 PM  5 years agoPost 10
Jared J

rrApprentice

Harrisonburg, VA

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I find it odd they would mix old with new in the same bag-if it is in fact a new design and not an error.
that could have been a management decision to use up existing inventory. The designers may have felt that there was no structural flaw in using the two halves. Who knows.

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HelicopterCentury Radikal G20-30 N640 Hawk Predator › Anybody Ever Seen a Frame Like This?
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