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Ron’s HeliProz South . Century Helicopter . MTA Hobbies

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Safety - RC Helis are not toys > Safer Way to Check Head Speed?
 
 
ShuttleJock
Heliman
Location: Norman, Oklahoma

I have never felt comfortable walking up to a heli that is at hovering power setting to check the head speed with an optical tach. can you stake the heli down and get the same reading? I just have visions of bumping the collective having a couple of 550mm open a can of whoop ass on me. Is there a safer way to check head speed?
08-01-2007 Over year old.
 
 
Zaneman007
Key Veteran
Location: Texas - USA

yea, buy a multi gov. set the head speed, and there is nothing to check.

I'd rather be flying
08-01-2007 Over year old.
 
 
cwright
Veteran
Location: Blossvale New York

Here is the what I use. I also check the governour just to be sure. Chuck
[url=http://www.modelavionics.com/]
08-01-2007 Over year old.
 
 
Tioli
Veteran
Location: Kona, Hawaii

An optical tach can be used from a long ways away. You do need to train someone else to use it while you fly, though. You do mean an optical tach that you sight through...right? If you have some one else do it, an optical tach is the safest other than a set and forget governor...
08-01-2007 Over year old.
 
 
Rafael23cc
Key Veteran
Location: Junction City, KS

What can be safer than this?



I can do it sitting on my chair in the pitts while my buddy is flying.

When you use a governor to determine headspeed, you need to install a governor in ALL your machines. Some people forget that some of us have more than one helicopter. And with some governors, you STILL have to double check the headspeed.

http://www.modelavionics.com

Rafael

Keep your feet on the ground, but your eyes on the sky.
08-01-2007 Over year old.
HOMEPAGE  
 
 
BrainDrain_dx
Senior Heliman
Location: Wichita KS

the trick to stop Rafael from sitting in his chair checking your headspead is to crank it up to over 3200 rpm where he cant read it

dx4life
08-01-2007 Over year old.
HOMEPAGE  
 
 
Rafael23cc
Key Veteran
Location: Junction City, KS

Yep, my tach only goes to 3190. I have checked headspeeds while Alan Szabo and Henry Caldwell been flying, still from my chair at the pitts. There is no safer place.

Rafael

Keep your feet on the ground, but your eyes on the sky.
08-01-2007 Over year old.
HOMEPAGE  
 
 
JuanRodriguez
Elite Veteran
Location: Rochester, New York

Quote 
can you stake the heli down and get the same reading?

NO !!!!!! DO NOT STAKE, TIE OR IN ANY WAY restrain your heli onto a stand or ground. That is one of the most unsafe practices that will for sure bite you in the butt big time.....
08-01-2007 Over year old.
 
 
Rafael23cc
Key Veteran
Location: Junction City, KS

Sorry I missed that about tying down a helicopter.

If this doesn't open your eyes, nothing will:
http://video.google.com/videosearch?q=ground+resonance

Rafael

Keep your feet on the ground, but your eyes on the sky.
08-01-2007 Over year old.
HOMEPAGE  
 
 
Gardner
Senior Heliman
Location: Orlando FL, United States

Eagle Tree Logger. Quite safe.
08-02-2007 Over year old.
 
 
trunkmunki
Senior Heliman
Location: Bangor

Ground resonance

The video above is an example of ground resonance. It is only a problem on fully articulated rotor systems, and only if an oscillation is allowed to develope due to landing gear interaction with the ground. I would be shocked to see this happen on a model (unless you were running a fully articulated head, but I am not familiar with any on the market).
08-08-2007 Over year old.
 
 
JuanRodriguez
Elite Veteran
Location: Rochester, New York

I have seen strapped down helis (such as the Raptor) VIOLENTLY shake to the point that if not immediately powered down, I am sure pieces would have started to come off !! VERY SCARY !!

I believe it may be due to the flexibility of the main frames....

Not a safe practice and I personally would not like to be around someone attempting to do so....

Another practice that has the potential to be unsafe is the IMPROPER use of headloaders..... I know I'll get a lot of flak about this statement but hear me out before you conclude that what I'm saying is bull......Headloaders were designed a number of years ago when folks were using low head speeds such as 1600 or so..... Now, put those headloaders on a machine and rev them up to 2000......WATCH OUT !! Either one or the two balls will fling off the headloader faster than you can react.... If you're fortunate enough to have them both detach at the same time you may be OK...... but you can imagine the vibration created if only one comes off and you're not able to shut down quick enough.....
08-08-2007 Over year old.
 
 
GyroFreak
Key Veteran
Location: Florida ... 28° 50' N 81° 16' W

Use Eagle tree data recorder whith Segull real time rpm readout at your transmitter station (or any body within a mile ).. Pricey but you don't need to be near your machine, plus you get a complete flight record history to plot (rpm, temp, servo positions, altitude, airspeed) when your done flying.

Support bacteria. They're the only culture some people have. !
08-08-2007 Over year old.
 
 
AceBird
Elite Veteran
Location: Utica, NY USA

Quote 
Not a safe practice and I personally would not like to be around someone attempting to do so....

Then stay out of Utica, NY.

If you lock the heli down it will require a bit of common sense when spooling up. Once the blades come in sync to where you have opposing balanced forces than you can run it up to head speed. If you do not have your blades tightened evenly you could get a frame shimmy because it takes more rpm to get them to synchronize. The solution is to balance the tightness of the blade grips.

While testing my heavy duty clutch I made a set of blade loaders that I had to shorten a number of times in order to get head speeds above 1500. Head loaders are great for tuning a new engine as it breaks in.



Ace
What could be more fun?
08-23-2007 Over year old.
 
 
andres.c
Key Veteran
Location: Florida , Dade County 33173

i used to use an onboard tach

now i use this


08-23-2007 Over year old.
 
 
JuanRodriguez
Elite Veteran
Location: Rochester, New York

Quote 
Then stay out of Utica, NY.

Let's see..... Rochester is about 2 hrs. or so..... I guess that's far enough.....

Hope your health insurance is up to date......
08-24-2007 Over year old.
 
 
AceBird
Elite Veteran
Location: Utica, NY USA

andres you pics won't open so its hard to tell what it is.

Ace
What could be more fun?
08-24-2007 Over year old.
 
 
JuanRodriguez
Elite Veteran
Location: Rochester, New York

Quote 
andres you pics won't open so its hard to tell what it is.

Don't need to open them to tell what they are..... The first one is a boom mounted tach..... the reading "holds" the highest RPM.....

The second is an optical tach..... either method can be used SAFELY to tell your headspeed......
08-24-2007 Over year old.
 
 
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Safety - RC Helis are not toys > Safer Way to Check Head Speed?
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