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3w 210csts reeds

stangflyer

I like 'em "BIG"!
I hate dead sticks. Pretty sad when you have one on a big 3w210. Upon inspection of possible causes why all of a sudden this perfectly sound and beast engine just all of a sudden quit in mid inverted flat spin, this is what I found. The reeds on one side of the reed carrier are basically destroyed. I suspect this was the cause of the dead stick as I have done the same inverted flat spins before and until today, never had an issue. Could they have been going and they just finally gave up the ghost? What would cause such a situation?

For insight, I have been running a Falcon 34x12 from the day I bolted it to the Yak. With the exception of one 10 minute flight with a Falcon 32x12. Rpm static with the 34x12 constant 5200'ish. With the 32x12, 6050. I think that is a little much for this big block, hence the reason I went back to the 34x12.

Any insight from some of you 3w owners? What would cause this?
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sweetpea

100cc
Looks like heat and dryness caused it. Had it been sitting around for long periods since you owned it (not just recently)
 
Too many rpms would cause that, as well. I have reeds that do nothing but sit around, no cracks or chips in them. It is a 106, that was in the "Cover Model" and then most recently, I installed it in my 108" EG Extra.

What is happening is kinda simple... They are fluttering at high rpms. Get another set, and cut these back that you have now to about half a reed, and make a "doubler" for it. Kinda like the DLE 120 reed mod guys are doing.
 

Snoopy1

640cc Uber Pimp
Is no 3w expert but have a couple. But looking at the pictures, it seems that they are failing at and above the level of where the reed hits steel plate that controls the max deflection. If possible look at the reed under a microscope and look at the area where the reed contacts the of the deflection plate. Then either side of the line. I belive you will a difference in the structure. If so let us know. At least we then know what is happening and make some adjustments.
 

stangflyer

I like 'em "BIG"!
So I just got off the phone with the "G" man. In his opinion, he feels that the reeds were destroyed by something being ingested into the throat of the carb and then by the reeds. I did ask him his thoughts on the 32x12 and rpm. as if this would be a possible cause. He doesn't feel it would be the cause. He said that you have to remember these are the same reeds that are used on the 110, 157 and 170. The only variation is the reeds on the three engines mentioned are maybe slightly thicker. But he also mentioned the 210 reeds are the same reeds used in the previous version 200. He doesn't feel the rpm was a factor as the 110, 157 and 170 obviously turn much higher rpm. But my thought...(just my opinion) If the 110, 157 and 170 reeds are the same, with only the slight variation of a smidgen thicker, they would probably be able to handle higher rpm without any subsequent flutter and damage. Either way, I am going with Gerhard's opinion here and will follow his direction to a "t".

I did inspect the inside of the engine. It looks like it just barely came out of the box. No wear on either pistons, cylinders or any other part. Other than the rods being "shinned" by the fuel mixture passing by them, they are perfect as well. I was concerned of any of the reed material getting inside the engine and causing more damage. Gerhard did say that, "THAT" in itself is of no concern as the fractured pieces of the reeds will be drawn in past the crankshaft and thereby being "pulverized" by the rotating assembly.

The only thing I can come up with as far as the 210 ingesting some foreign material is, Though this engine was basically brand new when I purchased it as a second owner, (I was told it had "maaaaybe" if even that, a gallon through it) the previous owner unawaringly picked up some thing into the carb and did not realize it. From day one of bolting the 210 to the Yak, the bottom of the Behemoth Yak belly has always been incredibly splattered with residue. As with all new engines, I didn't really consider it a "HUGE" concern...though it was much more than I have ever seen with any one of my brand new engines. Now I am wondering and seriously conceding that there is a very very strong possibility that the reeds were damaged when I received the engine. Hence the way excessive splatter and truthfully not the best rpm to start with. Still, a new "dub" doesn't always have the best rpm until they start breaking in.

I snapped a few more photos of the damaged reeds and the opposing reeds that are undamaged. I thoroughly inspected "everything" to make sure I was not missing anything.

Final resolution: Ordered a new set of "long" reeds and the aluminum carb base plate and a full set of gaskets from the "G" man.

The most unfortunate outcome of this situation is that I may have lost the Yak. Besides the "BRAND NEW" 34x12 I just received from Norhtwest RC, (Supatim). The underside of the belly of the 40% Pilot Yak where the landing gear plate is attached to the fuse is absolutely and completely obliterated. Although the rest of the entire airframe, (wings, stabs, rudder, gear, wheels, canopy...even the cowl) came through unscathed. All adjoining structure is also completely whipped out. I would be hard pressed to rebuild this, even with the free wood that Tony has already promised to send. I just don't know. Losing this big bird really hurts.

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js-rc

70cc twin V2
Sad to see that happen . I hope after you keep looking at it for a few days, it may look easier to rebuild. That's what I do all the time, though that's probably not too comforting right now. I finally got 20 flights on my big one & that's cause I lost 2 months waiting for my buddy to rebuild my motor mount. The engine twisted it all out in the first 11 flights. Now waiting for the heatwave here to go away, ha !!
Best wishes on rebuilding !
 

stangflyer

I like 'em "BIG"!
Thanks guys. Just not sure yet. 67 bucks for all the free wood is tempting. But so is my pal Steve Coleman's offer. Brand new untouched custom scheme 40% Pilot Yak. Then there is the temptation of a 40 center Purple and Orange 330sc. 210csts yanking that around would be better than a night with Farrah or Loni or "ANY" ole tall green eyed, red head!!:spongebob:
 
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