Why do you make it so hard?

[furyevo]

No, really. Why does engine alignment have to be this f%cked up? I was all happy, the parts I needed to finish the Stratus came in after the long holiday weekend. This week may be the last of the decent flying weather around here, and I was looking foreward to getting some stick time in. I did everything the manual said. .038 to .039, it said. Thrust washer must be .038 to .039. So, I made sure it was. Took out the caliper, and bingo, right on the money. But, when I put the upper and lower frame halves together, I have a ton of room between the driver and fan. I mean, around .070. So now, I have to take everything apart, and start over. The runout was 0, I had the sweet spot, and now it all comes apart. :arggg:

Are there any other measurements that are wrong in the manual, or is this it?

[Clintstone]

which motor are you running?

[furyevo]

YS .91. I just can't seem to get it to line up, it will need a thicker washer behind the fan. I don't know if something is wrong with this engine, it took a lot to get it shimmed right in the Extreme, too. But it has also done some time in a Raptor and an Evo .90, and fit perfectly in there. To get it to fit right in the Extreme, I used the thick washer I had behind the fan in the Evo. It looks like I need to take the engine out and put that washer back in. It just pisses me off, because in the time it took for me to reply, I rebuilt my Evo 50 that I dorked real bad, but I could only afford one set of blades, and I bought blades for the Stratus.

Could my fan be the problem? If I had the same issue with the Extreme, but not with the Raptor or Evo, it must be the fan, right? I have the metal fan, and I did buy the right collets for the YS engine.

[capebob]

The Stratus has a rather flexible upper section and it is possible to secure the upper and lower parts of the helicopter and have a large gap remaining between the clutch driver and fan. This is due to the force that it takes to get the clutch driver prongs all the way down into the dampeners in the fan. Remove your glow plug and give the assembly a good spin with your starter. The clutch driver will settle into the dampeners just fine. Next time use a little talc to lubricate the dampeners.

Bob

[Clintstone]

Was the kit YS specific? The ys has a special plate that goes on the bottom. I would also suggest calling MA . The plate on the back of the motor should say YS but regardless ,spin the motor and let it settle and then measure the gap on the driver and then measure the carbon spacer on the backc of the motor. You can add to the spacer where you need to be and that will be it. I am running around 25 thou.

[DavidH]

Is the kit 8.45 or 8.18 gear ratio?
As Clint mentioned above, the spacer plate will be for the OS or YS.
If the kit ratio is 8.18. The spacer plate is for OS.
8.45 and the spacer plate is YS.


David

[G MAN]

There are 2 different spacers for the Ys engine,the one for the 80 is thinner than the one for the 91.It sounds like you have the wrong spacer installed,you need the thicker one which is .093 thou thick. My kit came with both spacers. The one for the 91 says YS 90 on the spacer.DOUG

[furyevo]

Well, both of my spacers said YS 90, but the difference in thickness would not make up for the gap I have, but using both spacers would. :?:
I talked to Tim today, and he gave me a few things to check, and he said he will help me get things right, not just put a band- aid on it. You have to love the level of support you get with MA.

[furyevo]

Well, I'm stupid. The crankshaft is hitting the clutch driver. :oops:

[Clintstone]

Just have fun, sorry you had trouble.

[WayneBrown]

Well, I'm stupid. The crankshaft is hitting the clutch driver. :oops:
I've done that too.. three hours of dial indicating to find something hits.
When I had the YS 80 in my stratus, I added washers between the bottom plate and the ladders for clearance at the driver.
Worked pretty good until I felt industrious enough to put the 91 in.

[DavidH]

Sorry I didn't think about the crankshaft. The tip of the crankshaft should be about an 1/8 inch below the face of the fan hub. It is always best to trial fit the clutch driver to the fan hub with the dampners in the hub. Do this with both parts outside the model. The clutch driver should sit flush against the fan hub when test fitting the parts as above.
You will need to add a washer between the lower collet and front bearing on the engine to position the fan correctly on the crankshaft.

David

[furyevo]

Oh, I give up. I took the engine into work, milled down the end of the crank, and trial fit everything. So far, so good. So, I'm slowly running the fan down, turn it a bit, tap tap, check runout, you know the drill. Well, when the crank nut is all the way tight, I can spin the fan, so I guess I ruined the collets. I should quit now, I am damaging this heli without even putting it in the air.

[capebob]

Furyevo,

You may be out of threads on your crankshaft. Put a washer under the nut and see if you can tighten the fan.

Bob

[WayneBrown]

the YS 91 needs the thicker washers under the fan, and under the nut.

[furyevo]

the YS 91 needs the thicker washers under the fan, and under the nut.
:hug: :mrgreen:

[WayneBrown]

the kit should have one thin washer, and a thick washer for the fan assembly. I found two thick washers did the trick.
Nice pic, too bad we can't see the gap for the wires across the driver.. :shock:

[furyevo]

Gap? There is no gap. :arggg:
With a washer thick enough under the fan for the fan to tighten, there is no gap. My kit had two carbon plates for under the engine, both said YS 90 and were .090 thick. All I need to do now is get a thinner spacer, like the one for the YS .80, and all will be well.


Wow, I just looked at that picture closer. Extreme desktop theme (that is the one I upgraded, still have that canopy), Hatori box, realflight controller, I am a heli junkie, ain't I? :D

[DavidH]

The YS has always took the washer that comes with the engine. This washer will go between the lower collet and front bearing of the engine. Then the fan hub, and upper collet. 0331 shim washer, nut. That is what worked with the YS for me for several years.

David

[capebob]

Yep, David's statement is absolutely correct. With the washer that comes with the engine (the washer has a slot for a woodruff key, the key is not used) between the front bearing of the engine and the fan then the fan and a 0331 washer then the nut you should have a perfect gap. Under the engine should be 126-28 Main Motor Base Plate – YS and 126-29 Adapter Plate – YS. I have two of them and I've never had a problem except that on one of my engines I had to use a slightly thicker washer under the nut because this particular engine was short a turn or two of having enough threads. I think I used two 0331 shim washers, but I'm not taking it apart to check for sure. :D

Remember the stock washer goes under the fan and a washer thick enough to allow you to tighten down the nut goes under the nut.

Bob

[furyevo]

Well, when I talked to Tim, I found out something interesting. It seems I got one of a batch of engines that shipped with a slightly thicker YS .80 backplate. To complicate issues, both of my shims in my kit were .090 thick. Tim is sending me the right shim for the motor, and all will be well.

[WayneBrown]

in the meantime, You can add a 3mm washer between the stands and the bottom frame and fly the thing. I flew mine for almost a year that way before changing from the YS 80 to the 91. It opens the gap enough to prevent interference. Dry fit it and see what happens.

[furyevo]

fly the thing.

Oh, how I wish I could. The weather up here is 18 degrees with a biting wind. For now, it's indoors for me.
However, we did use it as a centerpiece for a football party. :mrgreen:

[furyevo]

Ok, it works now. I put in the thinner plate, and then had to shim between the bottom plate and stands to get the side to side clearance, but it's all good now. Thanks for all the advice.