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HelicopterTools and Field Equipment › Which optical tach?
03-05-2009 04:08 PM  8 years agoPost 1
Tyler

rrElite Veteran

Chicagoland area

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I am shopping for a good optical tach to use with helicopters from 90 size all the way down to the 250. Which one is accurate, reliable, and has enough rpm range?

Next question is where to find the recommended tach?

Tyler

Enjoy things that money can buy IF you don't lose the things money can't buy.

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03-05-2009 04:20 PM  8 years agoPost 2
Dood

rrProfessor

Wescanson

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The Model Avionics Sky Tach has a range of 1000 – 3190rpm
(Red) MinAir X-Cell tach has a range of 500-3000

There's a "Multi-Tool" available called the Bantam E-station helimaster. It has a built in tach which I understand is good to 3000 RPM's.

I have personally tested the X-cell and SkyTach's against a known source. Both I found to be really accurate.

Those are the 3 that I know, there may be others.

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03-05-2009 05:15 PM  8 years agoPost 3
smallplanes

rrElite Veteran

S.C. ,SSA

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I like the Sky Tach but it will not work for the 250. I don't think there is one made that will work on the 250 as i've heard the 250 runs around 5000 rpms.


Spectra G 26cc
Jewel
Bat 27cc
Trex 700<br

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03-05-2009 05:25 PM  8 years agoPost 4
Funky Trex

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Westerville, OH -​USA

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Personally, I like the Skytach. It works great and mine has been pretty accurate.

BTW, don't worry about the RPM range. Even the old ones with lower ratings can tach any heli headspeed we run.

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03-05-2009 05:39 PM  8 years agoPost 5
smallplanes

rrElite Veteran

S.C. ,SSA

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Well if its over 3200 rpms i don't see how it will tach it?


Spectra G 26cc
Jewel
Bat 27cc
Trex 700<br

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03-05-2009 05:43 PM  8 years agoPost 6
Tyler

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Chicagoland area

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Funky Trex...

BTW, don't worry about the RPM range. Even the old ones with lower ratings can tach any heli headspeed we run.
please explain.... I'm ready to buy once I am assured the skytach will work for my needs.

Tyler

Enjoy things that money can buy IF you don't lose the things money can't buy.

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03-05-2009 05:44 PM  8 years agoPost 7
Funky Trex

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Westerville, OH -​USA

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You can also use the optical tachs to catch every 2 revolutions instead of 1. So even if it is running 6000 rpms, you just set it at 3000 and it works just like normal, you just need to double the readout on the tach.

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03-05-2009 05:50 PM  8 years agoPost 8
Tyler

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Chicagoland area

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3500rpm

So, how do I tach for 3500 rpm? Set the tach for 1750? What will the rotor disc look like in the view finder?

If I want to tach 4000 rpm, I set the tach for 2000 and watch for the blades to stop in the viewfinder?

Tyler

Enjoy things that money can buy IF you don't lose the things money can't buy.

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03-05-2009 05:54 PM  8 years agoPost 9
Funky Trex

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Westerville, OH -​USA

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Exactly. Just set it for half of the target RPMs. It will look exactly the same in the viewfinder because it is still stopping the blades every 2 revolutions instead of each one. If your trying to tach a heli running 4000, just set it to 2000.

My Trex 450 runs higher than my Skytach reads so I have tried this plenty of times, it works great

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03-05-2009 07:27 PM  8 years agoPost 10
ammo

rrVeteran

Singapore

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One of the highest quality optical tach i've come across is the Western Robotics Chinook.
Price is high, however you'll understand why the moment you power it up.

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03-06-2009 08:44 AM  8 years agoPost 11
asm

rrVeteran

California

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I only use optical tech for nitro heli where governor is not used. For all electric, it's just much easier and far more accurate using EagleTree logger with brushless sensor. It not only give you head speed during hover, it record HS for the entire flight.

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04-11-2009 05:27 AM  8 years agoPost 12
RC.

rrVeteran

Bay Area Ca.

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+1 for The Model Avionics Sky Tach

RC.
MI Flyers.

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04-11-2009 08:35 AM  8 years agoPost 13
Aussie X-400

rrApprentice

Sydney

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+2 for the sky tach. I have used it for every thing from my MT-325 to my Rap 90 3D and everything in between.

Rap 90 3D, OS 91 HZ, Hattori, 10 CHG, 3 x BLS 451, Solid G/ BLS 251, ATG, Radix 690, Canopy FX.

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04-13-2009 09:04 PM  8 years agoPost 14
Romak

rrApprentice

Scotland

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Do any of you guys know in what increments this tacho goes up in??
JP MICROTACHO TACHOMETER Does it read to the nearest 10rpm or 100rpm.

Cheers

Rod
14sg....... ;-)

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04-15-2009 01:37 AM  8 years agoPost 15
Fabtek94

rrNovice

Honolulu, HI

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Can these recommended tach's work on multi-blades? Let say, a 4-blades setup?

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04-15-2009 01:49 AM  8 years agoPost 16
cwright

rrKey Veteran

Blossvale New York

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The Bantom tach goes to 4000 rpm in 5 rpn increments. It is a multi use tach. It will tach helis, planes, and tests servo as well. I think the price is about $120. In my opinion it is well worth it. Chuck

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04-16-2009 11:50 AM  8 years agoPost 17
philippevd

rrNovice

Belgium

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Can cheap aircraft tachs not be used? Such as the hobbico digital tachometer? It's less than 20$, but it doesn't mention whether or not it will tach heli's.

Philippe

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04-17-2009 03:06 PM  8 years agoPost 18
philippevd

rrNovice

Belgium

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I just got a reply back from hobbico.. their 30$ optical tacho is suitable for heli's. Why should I consider purchasing a more expensive model?

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04-22-2009 10:32 PM  8 years agoPost 19
DKNguyen

rrApprentice

N/A

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THat's not an optical tach. THat's a reflective tach. An optical tachometer lets you measure the RPM while you are in flight and varying the loading on the rotor. A reflective tach you need it close enough for you to see, or wirelessly transmit the data back to you somehow.

Reflective tach sends out a beam and bounces it off the blade. An optical tach requires you to look through it.

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04-22-2009 10:59 PM  8 years agoPost 20
Tyler

rrElite Veteran

Chicagoland area

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I bought a skytach, the price was right and it will only get used occassionally.

Tyler

Enjoy things that money can buy IF you don't lose the things money can't buy.

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