RunRyder RC
WATCH
 1 page 977 views Post Reply
HomeRC & Power✈️Aircraft🚁HelicopterRadio - Servo - Gyro - Gov - Batt › Proper way to measure head speed
09-07-2006 05:34 PM  14 years ago
Topic Vote0Post 1
reelcut

rrNovice

Santa Clarita, CA

MyPosts All Forum Topic
Proper way to measure head speed
What is the proper way to measure head speed using a tach?
SHARE  PM  EMAIL  Attn:RR  Quote
09-07-2006 06:11 PM  14 years ago
FLYINFOOL

rrKey Veteran

Cudahy, WI

MyPosts All Forum Topic
The proper way is to use an optical tach made for helies, and have a helper to operate it while you fly.

You look thru the window on the tach, and using the buttons adjust the tach till the blades appear to stop moving.
Then read your headspeed from the display.
Jeff Borowski
SHARE  PM  EMAIL  HOMEPAGE  GALLERY  Attn:RR  Quote
09-07-2006 06:53 PM  14 years ago
reelcut

rrNovice

Santa Clarita, CA

MyPosts All Forum Topic
Do you have a link to a good tach I should get?
SHARE  PM  EMAIL  Attn:RR  Quote
09-07-2006 08:01 PM  14 years ago
CXD

rrApprentice

Norway

MyPosts All Forum Topic
Model Avionics Has one.
http://www.modelavionics.com/
Same as i have.
Dumb Thumbing doesn't apply to pinchers!
SHARE  PM  EMAIL  GALLERY  Attn:RR  Quote
09-08-2006 12:27 AM  14 years ago
Yug

rrMaster

UK. Herts

MyPosts All Forum Topic
There are other ways which are easier than using a tach and don't require perfect eyesight. I use an mp3 player with a recorded sample of the engine at the correct rpms.Vegetable rights and Peace
SHARE  PM  EMAIL  GALLERY  Attn:RR  Quote
09-08-2006 04:31 AM  14 years ago
turboomni

rrProfessor

East of the Equator

MyPosts All Forum Topic
Or you could get a CSM revlock Gov and not worry about having a tach at all. Set it where you want it and fly,,forget about some i^&* [friend ] figuring out your 100 buck tach while you fly it.
Revlock counts and sets crank rpms, do the math for the headspeed and your set it .
Setup is everything, All my heli's can fly far better than I can pilot them
SHARE  PM  EMAIL  GALLERY  Attn:RR  Quote
09-08-2006 02:48 PM  14 years ago
FLYINFOOL

rrKey Veteran

Cudahy, WI

MyPosts All Forum Topic
The model Avionics tach is the one that I use also.
It costs a lot less, and works just as good as the Miniature tach.
Do not get a tach made for airplanes, they are just not the right tool for the job.

Even when I set up a heli with a gov, I still verify the setup with a tach.

Yug, Please don't take offence, but if your eyesight is not good enough to use an optical heli tach, you should not be flying RC. Most of us old farts (not all) do not have good enough hearing to do audio comparison with a good level of accuracy, and you still need the tach to know that you are recording the sound of the engine at the correct RPM.
Jeff Borowski
SHARE  PM  EMAIL  HOMEPAGE  GALLERY  Attn:RR  Quote
09-08-2006 03:10 PM  14 years ago
Yug

rrMaster

UK. Herts

MyPosts All Forum Topic
FLYINFOOL - no offence taken. I use audio processing tools on my PC to repitch the recording to give the correct HS given the gear ratio. My eyesight ain't that bad, but standing 20 feet away from the tach display makes it hard to see. Any closer and danger levels are too high for comfort. I've tried 3 optical tachs and they're all a pain in the ass compared simply listening to my audio samples where I can then tweek the HS in flight.Vegetable rights and Peace
SHARE  PM  EMAIL  GALLERY  Attn:RR  Quote
09-08-2006 03:31 PM  14 years ago
FLYINFOOL

rrKey Veteran

Cudahy, WI

MyPosts All Forum Topic
Ahh
I see the difficulty now. You are using an airplane tach and not a heli tach.
With an optical tach made for helies, the tach is held in your hand and will still be able to check head speed from any distance that you can still see the heli. The heli tach can be used to monitor head speed in FFF or a full power climb-out to check for bogging.
An airplane tach must be within about 3 feet of the blades to work and is NOT recommended for heli use due to the danger level you mentioned.
Jeff Borowski
SHARE  PM  EMAIL  HOMEPAGE  GALLERY  Attn:RR  Quote
09-08-2006 10:46 PM  14 years ago
gkoutsis

rrKey Veteran

Athens Greece

MyPosts All Forum Topic
Strap the plane tach on the boom and you're good George
SHARE  PM  EMAIL  GALLERY  Attn:RR  Quote
09-11-2006 05:14 PM  14 years ago
FLYINFOOL

rrKey Veteran

Cudahy, WI

MyPosts All Forum Topic
Unless you want to know the headspeed in anything other than a hover right in front of your face.

The question was "Proper way to measure head speed" not what kind of works OK.

The airplane tach strapped to the boom changes the CG and adds weight which will require a higher pitch and throttle setting to carry the extra weight. It also requires you to fly close enough to read the tach (closer than I ever want to be to a flying heli) and will never let you know the headspeed under full load which is very important to setting up the heli correctly.
Jeff Borowski
SHARE  PM  EMAIL  HOMEPAGE  GALLERY  Attn:RR  Quote
WATCH
 1 page 977 views Post Reply
HomeRC & Power✈️Aircraft🚁HelicopterRadio - Servo - Gyro - Gov - Batt › Proper way to measure head speed
Print TOPIC

 5  Topic Subscribe

Friday, December 4 - 1:53 pm - Copyright © 2000-2020 RunRyder   EMAILEnable Cookies

Login Here
 New Subscriptions 
 Buddies Online