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Home✈️Aircraft🚁HelicopterSafety - RC Helis are not toys › Safer Way to Check Head Speed?
08-01-2007 02:24 AM  13 years ago
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ShuttleJock

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Norman, Oklahoma

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Safer Way to Check Head Speed?
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?
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08-01-2007 02:39 AM  13 years ago
Zaneman007

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Texas - USA

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yea, buy a multi gov. set the head speed, and there is nothing to check.Old Guys Rule!
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08-01-2007 02:59 AM  13 years ago
cwright

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Blossvale New York

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Here is the what I use. I also check the governour just to be sure. Chuck
[url=http://www.modelavionics.com/]
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08-01-2007 05:08 AM  13 years ago
Tioli

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Kona, Hawaii

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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...
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08-01-2007 03:28 PM  13 years ago
Rafael23cc

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Junction City, KS

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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.
Team Heliproz.com
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08-01-2007 04:47 PM  13 years ago
BrainDrain_dx

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Wichita KS

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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 KDS Agile 7.2/5.5 Chase 360 - SkyHero Spyder/Spy/Little Spyder
Sponsored by my Visa
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08-01-2007 06:17 PM  13 years ago
Rafael23cc

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Junction City, KS

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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.
Team Heliproz.com
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08-01-2007 07:16 PM  13 years ago
JuanRodriguez

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The Villages, Florida

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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.....
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08-01-2007 09:29 PM  13 years ago
Rafael23cc

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Junction City, KS

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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.
Team Heliproz.com
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08-02-2007 03:00 AM  13 years ago
Gardner

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Orlando FL, United States

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Eagle Tree Logger. Quite safe.
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08-08-2007 02:57 AM  13 years ago
trunkmunki

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Bangor

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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).
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08-08-2007 01:50 PM  13 years ago
JuanRodriguez

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The Villages, Florida

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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.....
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08-08-2007 02:02 PM  13 years ago
GyroFreak

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Sanford Florida ...28N 81W

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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.The case against politicians simply is that when they legislate for all men, they always omit themselves
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08-23-2007 09:08 PM  13 years ago
AceBird

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Utica, NY USA

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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?
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08-23-2007 10:40 PM  13 years ago
andres.c

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pan

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i used to use an onboard tach

now i use this

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08-24-2007 12:04 AM  13 years ago
JuanRodriguez

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The Villages, Florida

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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......
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08-24-2007 12:09 AM  13 years ago
AceBird

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Utica, NY USA

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andres you pics won't open so its hard to tell what it is.Ace
What could be more fun?
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08-24-2007 12:16 AM  13 years ago
JuanRodriguez

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The Villages, Florida

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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......
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