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Old 11-06-2011, 08:10 PM   #1
John Cook
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Default Compass Team Tips Videos

Going to start a thread here, and hopefully it will continue to build. The purpose being on getting team members to help post videos on "tips" they employ to help out in repair, increase performance/reliability, etc....

I know we all have our own tricks, but it doesn't do the masses any good unless they know them as well. I'm giong to post the first one, regarding a nagging issue I occasionally have.

Hope it helps
Episode 1---Fixing the loose tail hub/shaft.
Also to clarify, I mis-state that the set screw gets loose. It's NOT the set screw getting loose, but the shaft metal wearing a bit against the grub screw and thus the assembly loosens enough to create play. So when I talk about the screw loosening, it's NOT again the screw turning or becoming loose. Sorry for that!


pic of tail shaft where grub screw has burrowed into the metal. If this loosens just a touch, the shaft will start to wobble a bit until corrected.



Episodes 2 and 3: http://www.helifreak.com/showthread.php?p=3465174
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Last edited by TheBum; 12-13-2011 at 09:15 PM.. Reason: Added links to episodes 2 and 3
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Old 11-06-2011, 09:04 PM   #2
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Nicely done John!

Great information!
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Old 11-06-2011, 09:44 PM   #3
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Awesome idea John!

Increasing the surface area that pressure is being applied to (by removing the high spot ring on the grub screw) makes it so that much more metal would have to be distorted for the hub to loosen.

Please keep the Team Tips coming!




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Old 11-06-2011, 10:04 PM   #4
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Old 11-07-2011, 02:39 PM   #5
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Quote:
Originally Posted by John Cook View Post
..but it doesn't do the masses any good unless they know them as well.
Thank-you What a GREAT service to your Compass customers.
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Old 11-09-2011, 01:49 PM   #6
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This is a big service to the Compass community. Compass already has great support via Team Compass and Nankin Hobby. This takes it to another level. I've seen Curtis Youngblood do these types of videos with his products and they are highly appreciated by the heli community. I think those videos should also be embedded on the Compass web site under a "Team Tips" menu item.
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Old 11-11-2011, 06:50 AM   #7
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Keep them coming... I'm getting a 7hv very soon and I read all the threads here just to get good heads up information. Great job, John!

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Old 11-11-2011, 08:49 AM   #8
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thx guys! I'm very flattered that there has been such a positive response to this video and the potential of more to come.

I'll be doing more as time allows. They will be for compass helis in general, not just the 7hv, but since Compass designs seem to trickle up/down among the models. Alot of what will be covered will be applicable across models. For instance the tail hub video while used the 7HV for reference, is useful for the 3d plus and 6hv etc...

Next topics in the cue:
1--Post crash--Fixing the damage you don't see( with sub topics)
a) fixing "fish wallow" on the tail
b) which bearings to be concerned about changing IMO
c) swash balls
d) misc

2-- 3d plus---changing the clutch or clutch bell w/out removing motor

3---Servo and wire routing without going insane--for 6HV and Atom 500

4---Goop---The heliman's equivilent of duct tape.

btw in my videos---I sometimes don't know if there is a correct term for what I'm describing, so I may make up names. If there is a term/name to what I may describe, I'm probably unaware of that and you all can correct me on that . Certainly, I'm not perfect .

Oh, and my work table is ALWAYS messy . Wish it wasn't so, but with a more than full time job, wife and 4 kids, I get precious little time to work on my helis, much less fly them. Cleaning my work room usually gets pushed off until it gets so BAD that I can't find things or my projects start taking so much longer b/c of the mess. So hope you all can excuse the clutter and mess.

Also, if I stay motivated and keep putting out videos, and the rest of the team can chip in as well. We will probably start a seperate sub forum in the Compass area, once there is enough content anyway, so that way the vids will be better organized. For now I'll probably post them up here in the general Compass area, one at a time.
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Old 11-11-2011, 09:58 AM   #9
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Oh, and my work table is ALWAYS messy . Wish it wasn't so, but with a more than full time job, wife and 4 kids, I get precious little time to work on my helis, much less fly them. Cleaning my work room usually gets pushed off until it gets so BAD that I can't find things or my projects start taking so much longer b/c of the mess. So hope you all can excuse the clutter and mess.
How dare you make these great videos with a messy work area! ;-)
I bet I have you beat for mess. See attached.
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Old 11-11-2011, 08:51 AM   #10
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Quote:
Originally Posted by John Cook View Post
thx guys!..

Next topic in the cue:
Post crash--Fixing the damage you don't see( with sub topics)
a) fixing "fish wallow" on the tail
b) which bearings to be concerned about changing IMO
c) swash balls
d) misc.
What is a Fish Wallow?

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Old 11-11-2011, 09:00 AM   #11
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What is a Fish Wallow?

Sent from my Droid Charge using Tapatalk.
lol one of my made up terms. I'll describe it better in the video I plan to do, but it involves a very very slow back and forth wag of the tail. Looks like how a fishes tail goes back and forth as they swim forward. I'll describe causes for it, and the potential fixes.

PS---I also want to state that these fixes in many cases may not be Compass specific, they may help people across other brands. I'll be doing them though on Compass models though, hence team tips naming. Not to exclue others, but I'm not sure what will apply or not to other brands...

Many of the topics I will choose may very well be things that took me quite awhile to troubleshoot, or things I learned from other pro or sponsored pilots that are big time savers. I'm no 100% expert, but I have learned a fair bit along the way from having great friends in the hobby and going to many fun flys. Eventually I'll make mistakes, so when I do just call me out on it and tell me what I did wrong. I'm not here to preach from my pulpit, just trying to help other people out
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Old 11-14-2011, 02:47 PM   #12
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Cool 7hv buzzing reply

No it is not the center hub in the tail blade grips on the shaft(they are solid like it's one piece). As I stated previously everything in the tail is just as it should be and if you read my post you might note that it went from perfection to having buzz/vibe between 2 flights( not gradually over several flights, the way that things generally loosen on their own) and was caused by something I did during some routine maintenance( pretty sure the grease in the OWB is too thick but I still haven't found a local shop that even knows what tri-flow is) My issue is also not causing any tail wag or any other bad effects aside from loud buzzing and vibration(not shaking, no oscillation) in fact it does not seem to have changed anything else about the way it flies. Flies just like it did before, just vibration and loud only at governed headspeeds, not during spool-up and spool-down. Although the vibration is showing on the carbon fiber tail fin that is not its origin. The whole heli vibrates I think due to the thick grease in the one way bearing not allowing it to disengaged properly. I flashed the microbeast and got it close but have not yet got it dialed in because I don't want to fly the heli until I resolve this issue rather than take the chance of something worse happening. It is completely unrelated to the microbeast as well. I'm thinking it's the grease really and if not maybe the belt or a combo of the two. Otherwise, all I can think is maybe remove the motor mount and verify there is not a build up of loctight in the screw slots keeping the mount from aligning correctly. Which I don't think is the problem because I have flown about 5 times trying to sort this out and i see no difference in main gear wear pattern which has always been minimal. Infact, after snowing gear dust the first 10-20 flights I have seen no additional wear on the gear whatsoever. The heli went from flying like a 7hv (no vibration, silent) to flying like a shrimok(loud, constant steady vibration) if that helps to describe it.
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Old 11-14-2011, 02:51 PM   #13
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Hit up cycling stores for triflow.
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Old 11-14-2011, 03:00 PM   #14
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No it is not the center hub in the tail blade grips on the shaft(they are solid like it's one piece). As I stated previously everything in the tail is just as it should be and if you read my post you might note that it went from perfection to having buzz/vibe between 2 flights( not gradually over several flights, the way that things generally loosen on their own) and was caused by something I did during some routine maintenance( pretty sure the grease in the OWB is too thick but I still haven't found a local shop that even knows what tri-flow is) My issue is also not causing any tail wag or any other bad effects aside from loud buzzing and vibration(not shaking, no oscillation) in fact it does not seem to have changed anything else about the way it flies. Flies just like it did before, just vibration and loud only at governed headspeeds, not during spool-up and spool-down. Although the vibration is showing on the carbon fiber tail fin that is not its origin. The whole heli vibrates I think due to the thick grease in the one way bearing not allowing it to disengaged properly. I flashed the microbeast and got it close but have not yet got it dialed in because I don't want to fly the heli until I resolve this issue rather than take the chance of something worse happening. It is completely unrelated to the microbeast as well. I'm thinking it's the grease really and if not maybe the belt or a combo of the two. Otherwise, all I can think is maybe remove the motor mount and verify there is not a build up of loctight in the screw slots keeping the mount from aligning correctly. Which I don't think is the problem because I have flown about 5 times trying to sort this out and i see no difference in main gear wear pattern which has always been minimal. Infact, after snowing gear dust the first 10-20 flights I have seen no additional wear on the gear whatsoever. The heli went from flying like a 7hv (no vibration, silent) to flying like a shrimok(loud, constant steady vibration) if that helps to describe it.
Thanks for your input though. That gives me something to watch out for in the future. It's just disappointing that every place I call doesn't even know what tri-flow is. Gonna check the bike shops now, I'm almost out of hardware stores. It's weird in my area I can never find anything needed for heli's and usually have to order things. And if they ask me what it's for and I tell them the truth (that it's for a rc helicopter) they look at me like I'm the weird one while I'm looking back at them thinkin, "you're the one that doesn't know what tri-flow is". Sorry bout ranting, just thought this is kinda funny/weird.
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Old 11-14-2011, 03:11 PM   #15
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try some ATF(Auto transmission fluid) Synthetic if available for decent pricing. That works great for one ways
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Old 11-14-2011, 06:13 PM   #16
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TriFlow is available at OSH (Orchard Supply Hardware, owned by Sears) in their bicycle/automotive department.
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Old 11-15-2011, 11:38 AM   #17
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try some ATF(Auto transmission fluid) Synthetic if available for decent pricing. That works great for one ways
I would but that stuff smells so bad i don't mess with it unless my auto transmission in my truck needs refill/service
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Old 11-14-2011, 09:04 PM   #18
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We have sears here.(if its still there) I've never even heard of OSH before. The local cycle shop I went to today for tri-flow was gone.

Last edited by ethereal sky; 11-14-2011 at 09:10 PM.. Reason: mixed up responses and left out some important info.
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Old 11-14-2011, 09:06 PM   #19
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You were right about the tail hub, but, it isn't happening over time, it came like that new and the wobble is caused by the fact that the hole through the hub has too much clearance with the shaft inside of it. Rather than modifying the screw I want to fill the space between the shaft and hub, which is what's actually causing the wobble(I have really good eyes and can see the extra space). Not that your method doesn't work. I think compass should know about it so they maybe could start producing hubs that fit more snug on the shaft or maybe produce shafts that take a cap screw that sets into the side of the hub just a bit. Regardless this is not what caused my recent problems as I have been flying the 7hv like this since it was first built. However, this issue with the tail hub does in fact cause the tail flutter in FFF, FRF and FSidewaysF that everyone has been having trouble getting completely tuned out(I think). From my experience it does not effect the ability of the heli very much if any or the tail gain once its dial in, but, I am concerned that it might cause things to wear out prematurely on the tail. And it may make it more difficult for some people to get their tail gain dialed. And being that it's a part that shouldn't be moving in the first place it will always get worse with use(which is maybe why some people don't notice it fresh built but until they have a bunch of flights on it already). I actually noticed this when I built it straight out of the box but it flew right so I forgot until you reminded me. Thanks for reminding me I meant to do some thing about that sooner. The only non-soft material I can think of to fill that space is to go the opposite route you did and actually flood the space with blue locktight(so i can still get it off when I need too)and let it set till the next day. And if blue doesn't stop that wobble then red probably won't make it impossible to take off(which probably doesn't matter anyway cause if i need to take that apart its broken already and I'm sure I'm not the only person on here thats had to cut a tail shaft in the past after a crash). I'm not saying you're wrong at all though I just want a more definite and permanent fix. I want us all to have a perfect heli and the 7hv seems close fresh out of the box.
Not actually being caused by the screw.
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Old 11-15-2011, 11:25 AM   #20
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I know it's pretty much impossible to make a hole through the (steel?) hub smaller to fit better but, since that is the actual flaw that is causing the wobble, that is what I want to fix. I do agree that flattening the end of the set screw should be a pretty good fix. Problem for me is that the screw isn't the root cause of the problem. It is the side effect of the hub being too loose around the shaft. So even if the screw is flattened and the hub is not wobbling the tail blade grips are off center/unbalanced by a little maybe 1/2 a mm(hopefully less). and all the extra space in the hub is shifted to the side the set screw is in. Just bothers me that it still won't be the way it should be. I'd be all sh*ts and giggles if compass started makin'em with the right sized hole in it. I'm hestant to fix what isn't the cause because in the past I've had those kinds fixes (bandaids) cause other/more problems in the long run(or a circle of re-applying the bandaid over and over). I also don't want the tail flutter pushing on my BLS251 tail servo. Even though it seems not to effect performance it probably is on some level and putting more wear on everything on the tail including my servo.

Is there anyone on here that works directly with compass who I could speak to about this?

No offense to compass people, but, if I were designing this heli I don't think I would have allowed for those hubs to be in the kits if I could help it. It's such a tiny/gigantic flaw.
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