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HomeAircraftHelicopterMain Discussion › How to check head speed ?
03-29-2005 05:06 PM  13 years agoPost 1
GUSTO

rrNovice

wilbraham, mass

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I have an optical tach, but how do you check it ?
i don't see a safe way to check it ?
I am not sure how far away it is good to ?
it has a lazer pointer , that might help .

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03-29-2005 05:12 PM  13 years agoPost 2
RobRoy

rrKey Veteran

Huntsville, Alabama

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What model of tach to you have. I don't think the ones with a laser pointer have a range much over 3 feet. That kind won't work.

Ignorance is curable, stupidity is for life.

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03-29-2005 05:12 PM  13 years agoPost 3
Ted Toth

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Myrtle Beach S.C.

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optical tach what kind or model ?
Is this the kink for planks?


.

You don't stop laughing because you grow old, you grow old because you stopped laughing.

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03-29-2005 05:16 PM  13 years agoPost 4
GUSTO

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wilbraham, mass

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i dont have it here, it is hand held, and you use white reflective tape
i bought it from matco tool, was expensive.

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03-29-2005 05:29 PM  13 years agoPost 5
w.pasman

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Netherlands

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I use a tuning fork. If you can remember the engine sound then you can check after landing instead of during flight. If you can remember the target sound then you can judge the rpm from the engine sound just by listening.

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03-29-2005 05:48 PM  13 years agoPost 6
DMehalko(DM)

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Colorado

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So what is the best way?!

Whats the best tach?

Century Radikal E640FBL

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03-29-2005 05:57 PM  13 years agoPost 7
Leif

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USA

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The MA Optical Tach is one of the preferred ones for helis. Check it out at Heliproz.

MA Optical Tach

This requires TWO people to run. One flies the heli, the other runs the Tach. You adjust the shutter speed in the tach until the blades appear "stopped". Then view the number on the Tach to get the head speed.

The other way to tach your heli is to strap on a governor. The governor reads the engine speed using a hall-effect sensor, which detects a magnet that you attach to your fan. You need to enter the gear ratio to get the proper calculation of head speed from engine speed.

Leif

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03-29-2005 11:18 PM  13 years agoPost 8
SLiebl

rrApprentice

Lancaster, PA - USA

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Wow, $110+ for that TTR2000 tach? The downside to that tach is you can only use it on a hovering model.
My vote is for the Model Avionics sky tach. It really works well, hovering or flying.

-Steve

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03-29-2005 11:45 PM  13 years agoPost 9
HawkNoob

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Pa

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You can also buy the ModAvionics Optical Heli Tach for $85 from Heliproz. Works just as good as the MA tach for $140. I have had both.

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03-30-2005 05:17 AM  13 years agoPost 10
Fullagas

rrKey Veteran

Michigan

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.
I still just use a hand-held $30 tach. Only takes a moment, I hover and my bud holds the tach. Works at 10 feet, no problem.

.

Flying helis since gyros had springs.

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03-30-2005 01:08 PM  13 years agoPost 11
NewHeli

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Pittsburgh, Pennsylvania, USA

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Even if you use a governor, you still don't know if the headspeed is correct...you need a tach.

Now depending on this optical tach you have, there should be a viewport, a dial/up down switch, and a display screen. Look through the viewport and adjust the dial/switch until the blades on your heli look stopped (not moving). Then read the number.

NewHeli

Nathaniel Rice
Team YS Engines

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03-30-2005 02:41 PM  13 years agoPost 12
Supertoyz

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Colchester, VT

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Even if you use a governor, you still don't know if the headspeed is correct...you need a tach.
The governor will set the RPM, the head speed is directly related to the engine RPM by the gear ratio. Find out your gear ratio and set the RPM to achieve the head speed you are looking for.

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03-30-2005 05:05 PM  13 years agoPost 13
SLiebl

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Lancaster, PA - USA

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The governor will set the RPM, the head speed is directly related to the engine RPM by the gear ratio. Find out your gear ratio and set the RPM to achieve the head speed you are looking for.
Easier said than done. You need a tach. Even when using a governor such as the TJ, you've still got to tach the head to make sure you set it properly.

-Steve

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03-30-2005 06:53 PM  13 years agoPost 14
Raptor 50 (IL)

rrNovice

Israel

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Is it relly necessary to check the head speed?

cuz I am flying with out it not bad.

Find something els to waste your money about

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03-30-2005 07:43 PM  13 years agoPost 15
w.pasman

rrElite Veteran

Netherlands

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Wow dude... Way to do it the hard way man...
Tuning fork is easy and you have one for a few $. You may even already have a tuned 'a' 'c' or whatever fits your head speed on your mobile phone. What you guys are trying is a pain...

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03-30-2005 11:28 PM  13 years agoPost 16
NewHeli

rrKey Veteran

Pittsburgh, Pennsylvania, USA

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True, the governor will set the headspeed, but who says your governor is functioning properly?

NewHeli

Nathaniel Rice
Team YS Engines

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03-30-2005 11:53 PM  13 years agoPost 17
HeyRobi

rrApprentice

Nashville,TN

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I just made a little mount for mine(Hangar 9 Mini Digital Tach from HeliHobby) so I can atatch it to the tail and read it while hovering. Once you get an idea of how it sounds at the target headspeed, you really don't need the tach anymore!

HeyRobi
http://www.DarnGoodSeasoning.com

~{ If practice makes perfect & nobody's perfect, why practice? }~

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03-31-2005 05:12 AM  13 years agoPost 18
efergie

rrNovice

West Fargo, ND

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I have a brand new TJ and Hyper/MPII combo that I wasn't too sure as I didn't have a heli tach either. I finally set the blades to zero pitch in both normal and idle up 1 and tached it with my plank tach, with the govenor on and off. I just made sure as I got close I had a thumb on the throttle to kill it if nessecarry. Probably not the best way but it worked. I will be getting a heli tach soon though. And as every one said on here the TJ was very high. Normal was at 1900 and idle up 1 was just scary. Once I had the sound of the proper head speed in my ear it wasn't too hard to set up the head speed without the TJ on.

Uh..., yea..., I meant to do that.

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03-31-2005 05:41 AM  13 years agoPost 19
Wa11banger

rrElite Veteran

Huntsville, Al

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efergie,
Make sure to recheck when you get the tach... it will differ a bit from what you found once you get the stick to the exact hover position for the headspeed desired.

Rick

Proud member of the Quick UK, Duralite Flight Systems, V-Blade, & KBDD team

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03-31-2005 09:21 AM  13 years agoPost 20
Jeff Heliman

rrNovice

USA

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HT TACHOMETER
I buy from UK for this Tachometer, not bad!!
Can be used on Airplane and Helicopter with a stand & Servo Extension Set. all accessories & battery.
Price just only $22 !!!

http://www.sussex-model-centre.co.u..._Tacho-2346.htmhttp://www.sussex-model-centre.co.u..._Tacho-2346.htm [IMG]http://

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