Chinese weight mod

[Buzzkill]

I was causing trouble over in the trex 500 forum when I read this thread http://www.helifreak.com/showthread.php?t=77445 so I got to thinking, my Futaba S3154 gets hot, real hot and a few people have had them burn out on the Gaui 200. I PM'ed the guy to see if it was possible for the 200. Don't know if any of you guy's have the problem but I think it's a good idea. Sure would like to see some of you smarter than me guy's give it a go. ***y, this looks to be right up your alley err.....galley or something :thumbup:

[Gr4yb3ard]

Hey Dude,

I'm on it.

Managed to slam my hand in a door, so the typings not so good, I ain't surfen up to par, fer sure...

I'll also get the 3154 and other servos into the list asap.

***yb3ard
"...try typing with blue-gray salamis on one hand, jeez, I'm an idiot..."

[Buzzkill]

I got a reply from the guy custom milling these for the T500. He wants a Gaui 200 and will make them for us!!! How sweet is that?

[stoatnchips]

Excellent for you 3154/3153guys.... another problem identified and resolved. My Logictech 3100 never even gets warm but i bet thats because i'm not driving the tail hard enough, rather than it's heat sink ;-)

[Gr4yb3ard]

Okay,

As far as the, so called, "Chinese weights" (I'm not happy with this term... sorry I got good friends over there...) goes, refer to the April, I think edition of RC-Heli, which explains the "tennis racket effect" (masses moving into larger/smaller circles, and the load required.

I think you're on to this. makes sense.

Another point would be to check you voltage on the servo. Lot's of ESC's do different votls, we might all want to check.

There are Futabas out there that just die at over 5v, the 3154 is good to 6v, so far so good, but I've yet to check what voltage my rx is putting to the servo, but will do asap. I've got the 2100/3100, and this wench runs hot!!!

***yb3ard
"...that's all folks..."

[Buzzkill]

Why do they call it "chinese weights"? I don't think it's a negative phrase is it?

[stoatnchips]

Why do they call it "chinese weights"? I don't think it's a negative phrase is it?

"The term comes from the tales told by sailors to the guillible alleging the orthogonality of certain parts of the anatomy of the oriental female at a time long before the development of either the helicopter or political correctness" - John Watkinson - Art of the Helicopter

...could call them Balls of Steel if you prefer ;-)

[Gr4yb3ard]

EERRFF!

The Stoatster strikes, yet again.....

***yb3ard
"....:noteworthy, Awesome... "

[Buzzkill]

Where does he get that stuff?? :dontknow

[Buzzkill]

Stoat.......RunRyder ????? get a rope............... (just kidding)

[Gr4yb3ard]

Ah, well,

If you want to chat with a friend that lives in the U.K., you gotta put up with some squirrelly stuff...

...but in the long run, it's worth it... ;-)

***yb3ard
"...thread police battleship bearing down on me as I type..."

[stoatnchips]

:rolling

..its was just the quote that best fit Buzz's comment... read the technical stuff too...

http://books.google.co.uk/books?id=Q27ho2szWCoC&pg=PA71&lpg=PA71&dq=chinese+weights+rotation&source=web&ots=Nqj7LBbSqD&sig=3oUJV8vKQqGOd65i5b0qCxVE2Mk&hl=en#PPA70,M1

[Buzzkill]

Here's an update. I'll be shipping out a complete tail assembly including the shaft tomorrow to this guy so he can do his thing. I sure hope he can do it. I don't know if he realizes just how small it is.

[Gr4yb3ard]

Wow!

Not merely technical, this is a goldmine!....
Good find Stoats, got my copy on order...

***yb3ard

[Jetleaf]

Here's an update. I'll be shipping out a complete tail assembly including the shaft tomorrow to this guy so he can do his thing. I sure hope he can do it. I don't know if he realizes just how small it is.
Hey Buzz something to consider. All the expense and machining isn't necessary. The same thing can be accomplished by using 3 nuts on each screw. 1 nut screwed all the way up to the head of the screw, insert screw into blade grip and blade. 2nd nut goes on to secure the blade and grip as you normally do. 3rd nut goes on right behind the 2nd and is lock nut for the whole works. This is what Finless did on the Kasama tail grips for the T-rex 500. Check it out http://www.helifreak.com/showthread.php?t=68622

[Buzzkill]

Hey Buzz something to consider. All the expense and machining isn't necessary. The same thing can be accomplished by using 3 nuts on each screw. 1 nut screwed all the way up to the head of the screw, insert screw into blade grip and blade. 2nd nut goes on to secure the blade and grip as you normally do. 3rd nut goes on right behind the 2nd and is lock nut for the whole works. This is what Finless did on the Kasama tail grips for the T-rex 500. Check it out http://www.helifreak.com/showthread.php?t=68622

I hear ya. I saw that post too a while back. I just don't have the nuts (no pun intended) and I think it would be awesome for people that don't have the time, skill or whatever to do the mod to be able to order some custom made mod parts. I'm not knocking what your say because I know you and I and several other people in this forum could easily do the mod too. But just think, $10 (?) and you have balanced, made for the machine custom "anti tennis rachet effect" tail rotor bolts. Not to mention if our beloved Gaui 200 is going to grow in popularity then things like this will grab people's attention and get them thinking! Maybe :thinking

[Jetleaf]

You don't have nuts? :confused: But you can nose in! :happyd
Anyway I hear what you are saying and I didn't think about growth potential of this little beeotch.

[t-driver]

Hey Buzz something to consider. All the expense and machining isn't necessary. The same thing can be accomplished by using 3 nuts on each screw. 1 nut screwed all the way up to the head of the screw, insert screw into blade grip and blade. 2nd nut goes on to secure the blade and grip as you normally do. 3rd nut goes on right behind the 2nd and is lock nut for the whole works. This is what Finless did on the Kasama tail grips for the T-rex 500. Check it out http://www.helifreak.com/showthread.php?t=68622


i agree, it is possible to have the same effect with just adding nuts on both sides.
we don't have unthreaded bolts on the H200,so it's quite easy.
the problem would be "how many nuts to use...."

anyone with some spare time to give it a try and post the results????

[Jetleaf]

More importantly where to get the 1.3mm nuts.

[t-driver]

More importantly where to get the 1.3mm nuts.

i think it's 1.6mm,but maybe wrong though.

[stoatnchips]

i think it's 1.6mm,but maybe wrong though.

I think T-Driver is right, choppersuey would know for sure... Even more importantly... once you found your nuts, you're gunna need longer bolts too. Then the next issue will be the crosshead bolt head or a allen cap head will not weigh the same as the 3 other nuts, so the there will be a weight bias on one side. Buzz's contact would be the most accurate option but unless he is using an automated CNC rig, once you start looking at threading 1.6mm by hand its gunna be a pain in the 4r5e for him!:(

[HEIM JOINT]

Just to put your mind at ease. these are shots of a mechanical cyclic/collective mixer patterned after a huges500 that I designed and built when I was an apprentice machinist 35 years ago. ( I was 20) fortunately I have improved a lot since then. small is my specialty. those heim joints are made from scratch and have delrin liners around the ball.
everything you see was made from billet on a manual bridgport mill and manual lathe. cnc didnt exist for the general shop back then. By the way thats where my name HEIM JOINT CAME from

[SurfCity]

Zowie! How impressive is that!

:noteworthy

[stoatnchips]

Heim Joint.... UTTER, UTTER Respect dude, the finnish on those segments looks more like a casting!! :noteworthy:noteworthy:noteworthy

I'm into my engineering projects but that is in a different class. My first job was prototyping speed/torque transducers for turbine engines and i learnt a lot of my skills on bridgeports too... but being half your age, i had x,y,z digital readouts which made life way easier! If it all works out good, i hope you'll be up for more than a couple of orders!!

[HEIM JOINT]

Thanks, On the topic of just doing this with standard bolts and nuts:
1. You are guessing at the optimum weight and placement if you do too much the blades will do the opposite and want to stay at either extreme instead of zeo pitch. (YOU COULD MAKE IT WORSE)
2. You have to remove all that extra hardware every time you change blades.

I am using a digital force gage on the pushrod to find the optimum position and weight that reduces the pushod force to the absolute minimum. I am going to video the before and after so you will be able to know how much force the servo will see. and how much the actual force was reduced.