rrTV-PHOTO   New HD TV
HOME   rrTV-PHOTO   GALLERIES   MY GALLERY   HELP-FAQ
myHOME PM pmRR MEMBERS 332 ONLINE 42 EVENTS SEARCH REGISTER  START HERE
 
1 page794 viewsPOST REPLY
Century Helicopter . MTA Hobbies . Model Rectifier Corp

.
.
Radio - Servo - Gyro - Gov - Batt > Connect helis metalframe to reciever "ground" ?
 
 
Raptor_in_Swede
Senior Heliman
Location: Stockholm /Sweden

Hi
I have discovered that I get radio disturbancies on my GPH when it is far away (> 200 feet) . I don´t have it on my Raptor.
I have performed a parallell range test on both helis and cannot see any major difference. I am using PPM recievers in both helis.

My guess is that it is the metal frame and the different type tail drive (carbon fiber tube drive) of the GPH that can be the cause .

I have got recommendations to connect the metal tail boom to the frame ( a simple measure).
But should I connect the metal frame to reciever ground ( black wire) to have a electrical referencepoint between frame and reciever ?

As an electronical engineer it has always amazed me that the electronical equipment in a RC Heli has no galvanic (electrical ) connection to the metal parts in the heli.
If you compare to professional electronics where the grounding/shielding system is a major part of the design you can wonder ?!

Raptor 30V1/TT39H/Hatori#415/GY401_9253
Hirobo GPH GT/TT50H/Hatori #544/GY401_9254
RD8000
03-31-2002 Over year old.
 
 
heliman41
Key Veteran
Location: Valparaiso IN. USA

Hello, use a pc of stranded copper wire attached to the boom at 1 end(sand away the paint first), and attach it to a screw in the metal frame, that will solve your freq noise if thats where its coming from. You may just need to re-locate your antenna also, good luck. PPM can be a stinker sometimes.
03-31-2002 Over year old.
 
 
ed vega
Key Veteran
Location: nyc, queens

a friend sugguested similiarly using the black negative wire from a cut servo /batt connector. insert to any unused channel and ground it to the engine backplate screw using a star cut washer.
03-31-2002 Over year old.
 
 
GMPheli
Veteran
Location: W. Bridgewater, MA USA

I tried this once, and my heli glitched like crazy as soon as I started the engine. Remove the ground from the receiver and all was fine again. Strange.

Alan Angus
03-31-2002 Over year old.
 
 
Safe_Cracker
Key Veteran
Location: Chicago, IL

Not strange!

It just makes sense.A heli naturally creates kinetic energy from the rotors spinning.Look at it as a large vandegraph generator and go ahead and connect the ground (-) of your receiver to the metal frame which will eventually become (+).Oh by the way here's a common electrical trivia question, does electricity flow from positive to negative or negative to positive?Anyone should know this.After answering that quesion, so which direction does lightning actually strike?
04-21-2002 Over year old.
 
 
Renda
Senior Heliman
Location: Prague, Czech Republic

hi,
If you want do it right way you have to connect tail ball bearig with the boom then boom with engine/ frame and with battery ground. This all is while belt drive produces high voltage and it must be grounded, it is not enought to ground the boom you must get directly to belt (connect to the rear bearing of the tail).
04-21-2002 Over year old.
HOMEPAGE  
 
 
cripskillz
Senior Heliman
Location: Paso Robles CA

negative to positive on both lightning goes up i think

Copyright © 2001 - 2007 CripSkillz. All rights reserved.
04-21-2002 Over year old.
HOMEPAGE  
 
 
mfendley
Senior Heliman
Location: Saint Marys, GA

Depends on whether you're discuss hole flow or electron flow
04-21-2002 Over year old.
 
 
Steve Campbell
Elite Veteran
Location: Baton Rouge, LA

This must be an Hirobo thing. The Shuttle was well known for generating static electricity and requiring a ground wire from the boom to engine mount. Not all of them, of course, but especially among the early versions it did happen.

I have had seven belt drive ships (3 TSKs, 3 JRs, and a Raptor 30) with a never a hint of this. Some have opined that the cause was the idler pulley just ahead of the t/r output shaft. But the Raptor has one of these...

And of course, the machine here has a tube drive. Just re-read that; scratch all of the above, lest any Hirobo fans get upset...

If the glitch is a function of distance, then I would suspect your receiver. It is possible that the ship is generating just enough static electricity so that the rx can filter it out at close range, but if the glitch only happens a good distance away, the first thing I would do is send the rx back in for a full check-up.

You might "fix" the problem with a ground wire; and miss an incipient failure in the rx.

Steve
04-21-2002 Over year old.
 
 
Safe_Cracker
Key Veteran
Location: Chicago, IL

Hmmmmmm..

He said after he grounded the receiver to the metal frame of his heli that it became very glitchy and I explained why.Yes it is negative to positive earth being ground, lightening does strike from the ground up.You do get a-lot of staic charge from a belt drive but a majority of it comes from the rotors especially running composite or plastic covered woodies.What you want to do is to minimize arching by providing a path from the tail to the main frame with a piece of wire.When you get a static discharge it will produce many different radio frequencies and cause glitches in our rx's.What would work the best is providing an isolated housing for the receiver to help shield the receiver from interference.Oh one other thing, make sure the antenna led is away from the metal parts and isn't rubbing.
04-21-2002 Over year old.
 
 
Raptor_in_Swede
Senior Heliman
Location: Stockholm /Sweden

Loose screw on metal frame

I think I found the cause of the radio intereference att long distance.
There was a loose screw that could rattle against the metal frame of the Heli.
After tightening of this screw, grounding the boom and switching reciever with Raptors reciever the glitches are gone.
And the former GPH reciever works good in the Raptor so now everything is OK.

Raptor 30V1/TT39H/Hatori#415/GY401_9253
Hirobo GPH GT/TT50H/Hatori #544/GY401_9254
RD8000
04-21-2002 Over year old.
 
 
1 page794 viewsPOST REPLY
PowerHelis . JR-Spektrum . Gyro Hobbies

.
.
Radio - Servo - Gyro - Gov - Batt > Connect helis metalframe to reciever "ground" ?
  UPDATE SCREEN   PRINT TOPIC Advertisers 

Subscribe to This Topic

Friday, September 5 - 9:04 am - Copyright © 2000 - 2008 runryder.com | email | link to rr | runryder needs cookie