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HelicopterMain Discussion › do I need a Tach?
09-15-2007 08:31 PM  10 years agoPost 1
kirtos18tz

rrNovice

Franklin ,LA- USA

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I'm just starting out. I have a Raptor 50 with the OS 50 hyper. I will be running woddies for a while. Do I need a tach. so I don't over speed the head with the woodies?

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09-15-2007 09:00 PM  10 years agoPost 2
bald eagle

rrVeteran

detroit michigan

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no but you should find someone in your area to help with your setup

thanks jeff

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09-15-2007 09:39 PM  10 years agoPost 3
w.pasman

rrElite Veteran

Netherlands

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Yes get some help with the setup.
You can't use a tach when you're on your own anyway.
If you are on your own I recommend a tuning fork to set up the right RPM.

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09-15-2007 10:09 PM  10 years agoPost 4
shanee86

rrApprentice

Oklahoma City, OK, United States

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I was wondering same had my heli for along long time and never had at tach but looking lately at them wondering if I should get one. But what is a tunning fork?

My rc site shanesrc.com

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09-16-2007 05:44 AM  10 years agoPost 5
kirtos18tz

rrNovice

Franklin ,LA- USA

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thanks for the info. I have a friend to to the final set up and flight triming.

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09-17-2007 02:06 PM  10 years agoPost 6
w.pasman

rrElite Veteran

Netherlands

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Tuning fork is a simple piece of metal that makes an exact tone when hit. This is to 'calibrate your ear': it is just making it easier to determine the the absolute tone that your engine makes.

The absolute tone of your engine is directly coupuled to the RPM. For instance for raptor 50:

pitch of engine rotor rpm

g 1397 (way too low!)

as 1489 (just too low for hovering)

a (220Hz) 1552 (low end for hovering)

bes 1676 (high end for hovering)

b 1747 (low end for 3D)

c 1863 (3D)

cis 1941 (high end 3D)

Check also my website

[url=http://graphics.tudelft.nl/~wouter/helipage/tips/rpm.html]

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09-17-2007 02:29 PM  10 years agoPost 7
Yug

rrMaster

UK. Herts

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Or, an MP3 player with a recording of an engine running at the appropriate rpm

Vegetable rights and Peace

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09-17-2007 02:31 PM  10 years agoPost 8
AceBird

rrElite Veteran

Utica, NY USA

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very few people will be able to trust their ear for detecting RPM

Ace
What could be more fun?

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09-17-2007 05:42 PM  10 years agoPost 9
helical

rrApprentice

Bowling Green, KY

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very few people will be able to trust their ear for detecting RPM
It would be similar to matching a note played on an instrument. Not very hard. I think most poeple could get it very close.

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09-17-2007 06:18 PM  10 years agoPost 10
mlucia

rrKey Veteran

Essex Jct., Vermont

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Quote
very few people will be able to trust their ear for detecting RPM

It would be similar to matching a note played on an instrument. Not very hard. I think most poeple could get it very close.
If thats the case I failed miserably. I thought my r90's head speed was around 1800-1900 until by buddy broke out the sky tach. It was 2100

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09-17-2007 07:27 PM  10 years agoPost 11
cessna151

rrVeteran

Missouri... Originally Indiana

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No you don't need a tach yet, but if you plan on staying in the hobby and don't have a tight budget then go ahead and get one. You WILL use it.

--Eagles may soar high, but weasels don't get sucked into jet engines!--

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09-17-2007 09:08 PM  10 years agoPost 12
heligoole

rrKey Veteran

yorkshire,uk

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it would be helpful to you if you had one.I dont posess one but a few have them at our club,and i occasionally get them to "tach" my birds.It will come in handy as you say so as not to overspeed those woodies.

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09-18-2007 12:10 AM  10 years agoPost 13
AceBird

rrElite Veteran

Utica, NY USA

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I thought my r90's head speed was around 1800-1900 until by buddy broke out the sky tach. It was 2100
Some means of taching the blades should be used. Think about it, how much is that tach worth if it flings a blade?

Ace
What could be more fun?

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09-18-2007 03:09 PM  10 years agoPost 14
w.pasman

rrElite Veteran

Netherlands

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If thats the case I failed miserably. I thought my r90's head speed was around 1800-1900 until by buddy broke out the sky tach. It was 2100
Then you probably thought that one tone off (e.g. D instead of C) was good enough. You really need to get the target tone, not one lower or higher.

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