Hurri 425 OWG

[plus4]

Hi all, when installing the OWG on my 425 build should I only use one washer underneath it, or one above and one below as the assembly guide shows?
Tim.

[dunkonu23]

One washer underneath is what you should do. The bearing depends on a little play in order to work properly. When the helicopter first came out, a lot of people had problems with the OWB working properly. Gaui saw this and modified their manual. I don't know if yours came with the adendum, but one washer underneath is the way to go. Put a dab of grease on the washer to hold it in place. Also, if you ever need to service the bearing, you can pull the OWB shaft out from the bottom once you loosen the set screws in the front main gear.

Scott

[plus4]

Very many thanks Scott, I'll go back and remove the top washer!
My build instructions didn't come with any updates it appears.........

Tim.

[dunkonu23]

You're very welcome, Tim. Let us know how it goes!

Scott

[Jerrymac]

Tim, personally I think the top washer was the cause of many people's OWB failures. As Scott pointed out, Gaui revised the manual to show only one washer on the bottom, but no explaination as to why the change.

I think the friction between the top washer and the one-way bearing was causing the washer to wear and metal dust was falling into the OWB causing it to fail. Keep in mind that this is only my opinion, but, I have read about many OWB failures and most of those people said they had both washers installed.

When I built my 550 about 3 years ago, I could not get both washers to fit so only put one at the bottom. I also put only one in my 425 build a couple years ago. So far, I have never had a single OWB failure on any of my Hurri's. Again, not sure if the top washer contributed to some of the others owb failures, but, seems it might be a possibility.

Another thing that seems to be a long standing controversy is whether or not to lube the OWB, and what to lube it with. I myself, put a couple of small drops of ATF on them when I installed them and never lubed them again after that. I don't remember seeing anything in the manual about lubing it so I kept it to a minimum.

[plus4]

Thanks Jerry, very useful info, and the new flybar paddles I ordered fit perfectly, so the ones in the kit were molded/drilled incorrectly.

Mind you, I had to buy the second pair of paddles, my dealer didn't respond to a request to look into the problem, or even let me know what the problem might have been!

But at least they always seem to have a good stock of spares, and the delivery is super quick, always next day.

[dunkonu23]

I've lubed mine, too. Either with ATF or with Triflow Synthetic grease and only had one problem which was a cracked OWB because I would turn the blades counter clockwise when putting the blade holder on. Oh, well. Lesson learned there.

Sorry about your dealer and the paddles.

Scott

[Jerrymac]

It's too bad you had to pay for the new paddles since the ones that came in the kit were obviously defective. But, I guess it could have been worse too, had the new ones been from the same run and also been defective.

Good luck with your build. Keep us updated.

Hey Scott, I do that all the time on all of my helis, simply because of the way they end up sitting on my tail gate and in the truck bed. I just grab the blades and turn them, often times counter clockwise while packing up. I guess I better quit doing that if it caused damage to yours. I never really gave it any thought. Sometimes with 5 helis sitting on the tail gate, the blades are all kinda jumbled up over top of each other. I fold them together, then just rotate them which ever way is the closest to the boom.

Jerry

[dunkonu23]

Jerry,
Ever since I broke that OWB Gear, I've been turning the head clockwise, only. I mean, it's only a few bucks, but it's the thought of ruining something that works perfectly fine that stops me from turning it CCW. It's kind of like always folding the right blade over the left.

Scott

[plus4]

Yep, I’ll keep you updated as the build progresses, but things are slowing down a bit as the motor I ordered at the beginning of the month was on back order (Scorpion HK-3026-1600Kv),
I didn’t realize it at the time, so I’m just hoping it won’t be too long before it arrives !

Suppose I could always change the boom, belt and gearing, fit the Z20-980 I’ve got and build it as a 550!

But my plan was to do a 425 first for my son, as he’s coming to stay for a while next month, and then do the 550 for myself later.............................. decisions, decisions!!

Got a feeling what you guys might suggest !!!!

And thanks for the warning not to turn things anti-clockwise.

Tim

[dunkonu23]

LOL! I say, do what you feel is best, Tim. It's all good. The 550 will be more stable in flight, but I guess that depends on your son's skill level.

I have to remember we're international... counter/anti. Got it!

Scott

[Jerrymac]

I think you will like it no matter which combination you use.
I have one with short boom and 430's, medium boom and 500's, and long boom and 550's. They all fly differently from each other, but I enjoy flying all of them.

The 550 is very 'floaty', kind of like driving a school bus, but the other 2 are actually very stable also, just not like the 550, but my comparisons might be a little tainted now, as my medium boomed 500 is built on one of Scott's HeadHunter frames.

The HH framed 500 is actually more responsive to stick inputs than the plastic framed 425, which I think has a lot to due with the direct-to-swash servo set up on the HeadHunter frame. I will be upgrading my 425 to a HH frame as soon as Scott has them available again.

Depending on your's, or you son's flying skills, I don't think you will have trouble flying either the 425 or the 550. The 550 just responds slower to stick inputs, so if you dumb-thumb you usually have more time to recover. Something you certainly don't have with the little 200. It flys like a pissed off yellow jacket. ;D (Not sure if you have those in the U.K. )

[plus4]

Jun 30, 2011 0:23:24 GMT -5 Jerrymac said:

..................It flys like a pissed off yellow jacket. ;D (Not sure if you have those in the U.K. )

lol, I'll have to look that one up

edit: Ah, wasps..........

[Jerrymac]

Yep, nasty little fellows too.
Here is a quote from the University of Kentucky's website.


"Yellowjackets are often considered the most dangerous stinging insects in the United States
Yellowjacket stings can be life-threatening to persons who are allergic to the venom. People who develop hives, difficulty breathing or swallowing, wheezing, or similar symptoms of allergic reaction should seek medical attention immediately."

[plus4]

Sounds like those Yellowjackets are the 700 size version of our common wasp

[malcolm]

Hi there

I cover both sides of the atlantic and yes, yellowjackets are mean SOB's
More like a hornet than a UK wasp though

[dunkonu23]

The think with yellow jackets is that they swarm really quickly. There's a video somewhere out there by a guy named Gizmo who used to participate in the "Better Black Hawk" thread on RCUniverse who angered them, then proceeded to hover amidst the storm. It was insane!

Nice to see you again, Malc. I hope things are okay!

Scott

[malcolm]

Hi again

Not the same video but impressive all the same

[Jerrymac]

Here is the vid that Gizmo shot of the Yellow Jackets.
Sorry to derail your thread Tim.

[plus4]

I e-mailed Gaui about oiling the OWB, and their reply was,

"it is better if you lubricate the bearings inside the gear with oil before you fitting to the frame",

and

"we are use the One Way Gear oil,
do you know what this oil , because it don't have any brand or name,
it is just for the One Way Gear use"

so I guess a little ATF is the way to go as you said Jerry.