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Blitz Helicopters Avro 90 > Washout Arm Bolts
 
 
stanc
Veteran
Location: Conroe, TX

After flying my Avro two times, I found the bolts on the washout arms loose. I removed them and found the threads on the last half of the bolts had been machined off, something I didn't notice when I was building the heli. They were apparently done this way for two reasons in my opinion, one if the bolt was threaded all the way, they would squeeze the washout tight to the main shaft and two the bolts would hit the pins. Why they didn't just use a short bolt and not split the washout, I don't know. I must have put the washout on upside down, because now that I look at it harder there are threads in the washout on one side only. The manual doesn't say anything about this and I guess I wasn't paying enough attention when I put it together. I just put a drop of thick CA on the threads of the bolt and put them back in, until I could take it apart and check it out further.

Anyone care to set me straight on how the washout goes on?

Stan
Will Work for Electrons
05-04-2008 04:11 PM
 
 
RyanW
Veteran
Location: Stillwater, Oklahoma

The washout should be oriented with the smaller/shorter of the two "shoulders" of material on the top.
05-04-2008 10:19 PM
HOMEPAGE  
 
 
stanc
Veteran
Location: Conroe, TX

Then I have it correct. Can anyone explain why the side of the washout where the bolt goes in, is not threaded and the opposite side is? Why is the side that is threaded, the bolt isn't?

Stan
Will Work for Electrons
05-05-2008 02:07 AM
 
 
RyanW
Veteran
Location: Stillwater, Oklahoma

Mine is already assembled, but looking at it now, both sides are threaded. Could take a picture of your washout?

The side you put the bolt in depends upon whether you are doing the stable or 3D set up.

-Ryan
05-05-2008 03:14 AM
HOMEPAGE  
 
 
stanc
Veteran
Location: Conroe, TX

Your right and I have mine for 3D, instead of stable. Still doesn't explain why if you built it for 3D the holes aren't threaded before you put the bolt in, they are after because you made the threads with the bolt. The washout set up doesn't make since the way its done. Why make the bolt go all the way through and machine off the threads to miss the phasing pins and so they won't thread into the other side and squeeze the washout together. Why not just make the bolt shorter and the washout metal so the bolt has something better than plastic to tighten to. They went to extreme on most everything else why not the washout.

Stan
Will Work for Electrons
05-05-2008 03:52 AM
 
 
RyanW
Veteran
Location: Stillwater, Oklahoma

Believe it or not, they did go to the extreme on the washout as well. I asked about it and I was told they tested many different materials as well as combinations of materials. In the end, they came up with a specifically blended polymer that is as resistant to wear as any of the metals. That is why the washout is what it is.

I am just guessing here, but possibly the extra length of the bolt without the threads are to help align the bolt as you get it started in the washout.
05-05-2008 04:05 AM
HOMEPAGE  
 
 
stanc
Veteran
Location: Conroe, TX

Thanks for the help Ryan. Say hi to Chuck, he said he looked at your Avro a few weeks ago. Looking to see how to convert it to ePower.

Stan
Will Work for Electrons
05-05-2008 04:25 AM
 
 
kirk
Veteran
Location: Thornton, Colorado

Cool Ryan, it looks like you are on top of it

Hey StanC,

Ryan is right the washout was made of the materal it was to reduce wear. MA did the same thing on the stratus and extreme (everybody at first complained as well). The metal washout blocks seem like the way to go but they wear out really quickly and devolop tons of slop. I have 4 gallons thru my Avro (which is not a ton of time but its time) and the is no slop what so ever anywhere.

I think the bolts were long like they are and threaded like they are for two reasons:

1. To support the washout arm. If the bolt was short and threaded into the plastic it would strip out easliy and pull out quickly due to the forces on it.

2. If it was threaded all the way thru it would clamp the area that the phasing pins go thru and causing binding.

Anyway I am sure you have already figured this out. Its acutally a different design idea that is pretty cool IMHO...

Kirk
05-05-2008 05:55 AM
 
 
John Benario
Senior Heliman
Location: Atlanta

I think I have the answer to this question. One of the items that I told Neal about after building my kit was the washout block plastic bulged into the main shaft hole where the bolts were threaded in and made the washout block tight on the main shaft. I fixed the problem by dremel tooling the bulges out, but for a kit as high quality as the Avro that kind of fix is a bit out of place.

Neal agreed and said he would correct that issue, and I am guessing he corrected the issue by removing the threads from the end of the bolts so the plastic doesn't bulge out where the main shaft is. The unthreaded length is still important as it lines the bolt up in the hole and provides stability to the bolt. If your bolts loosened in the plastic it is likely that the bolts were overtightened a bit and possibly boogered the threads in the plastic a bit.

Kirk is correct regarding the play in the flybar. I have over 10 gallons through my Avro so far and the flybar is still tighter than any other helicopter I have built, even when the other models were new.

John Benario
05-05-2008 11:22 PM
 
 
stanc
Veteran
Location: Conroe, TX

That is exactly what happens when you use a regular bolt. I took a bolt and screwed it in just to see what would happen, it not only made a bulge which made it tight against the shaft but the phasing pin would touch the threads or so it seemed to. Lucky for me I put the arms on wrong so when I correct this I will have fresh threads for the bolts.

Stan
Will Work for Electrons
05-06-2008 03:39 AM
 
 
stanc
Veteran
Location: Conroe, TX

I swapped the arms and now they are on correctly for a stable set up. I was wrong about a regular bolt hitting the phasing pins, the pins stay free.

Stan
Will Work for Electrons
05-07-2008 02:21 AM
 
 
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Blitz Helicopters Avro 90 > Washout Arm Bolts
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