RunRyder RC
WATCH
 2 pages [ <<    <    ( 1 )     2     NEXT    >> ] 1460 views Post Reply
09-21-2009 12:20 AM  11 years ago
Topic Vote0Post 1
aceisback

rrApprentice

Terre Haute, IN

MyPosts All Forum Topic
Engine RPM
I was wondering if engine/head rpm could be accurately measured via a sensor on the tail rotor. I am working on a device to measure headspeed with a device attached to the heli that could be moved from heli to heli for setup purposes. This would give the pilot a visual clue as to what the headspeed is without the need for someone else operating a tach.

This is the kind of stuff I think of when it is raining and I can't fly!

Duane
SHARE  PM  EMAIL  GALLERY  Attn:RR  Quote
09-21-2009 12:31 AM  11 years ago
ShuRugal

rrKey Veteran

Richmond, VA

MyPosts All Forum Topic
i don't see why not. Only hard thing would be finding something to measure TR speed.AMA 700159
SHARE  PM  EMAIL  GALLERY  Attn:RR  Quote
09-21-2009 12:36 AM  11 years ago
Dood

rrProfessor

Wescanson

MyPosts All Forum Topic
why on the tail rotor?

And why not the main gear, rotor disc or the flywheel?
  ▲
▲ ▲
SHARE  PM  EMAIL  GALLERY  Attn:RR  Quote
09-21-2009 12:42 AM  11 years ago
XxCaTMaNxX

rrApprentice

Navarre, FL - U.S.A.

MyPosts All Forum Topic
i don't see why not. Only hard thing would be finding something to measure TR speed.
It wouldn't be hard at all.
This http://www.valuetesters.com/Extech-...PocketTachT.php

plus a calculator...
I told the doctor I broke my leg in two places. He told me to quit going to those places...
SHARE  PM  EMAIL  GALLERY  Attn:RR  Quote
09-21-2009 01:08 AM  11 years ago
aceisback

rrApprentice

Terre Haute, IN

MyPosts All Forum Topic
I have already built a digital optical tach, but I am experimenting with a self contained device to attach to ANY heli and be able to see what the RPM is just by looking at the heli. This way, if someone all of a sudden says, I wonder what my head speed is, you could just strap this device to the heli and see without the need to attach magnets, sensors, etc. This could also be used when the pilot is flying alone and wants to check the RPM. The tail boom and tail rotor seem to be easiest temporarily place a sensor to measure RPM using an optical sensor. Trying to mount a sensor on the many different heli frames is difficult because of all the variations. The tailboom is pretty much the same on all helis.
SHARE  PM  EMAIL  GALLERY  Attn:RR  Quote
09-21-2009 01:19 AM  11 years ago
airdodger

rrElite Veteran

Johnston USA

MyPosts All Forum Topic
You will need yo know the ratio for each heli the device is used on.Chris
SHARE  PM  EMAIL  GALLERY  Attn:RR  Quote
09-21-2009 01:28 AM  11 years ago
Sonic88

rrVeteran

Murfreesboro, TN

MyPosts All Forum Topic
Sounds like a cool idea, but I just assume use my tach. Of course the ability to use it alone would be nice. It would all depend on the price on whether or not people would use it.Procrastinators of the world unite ... tomorrow.
AMA #: 912822
SHARE  PM  EMAIL  GALLERY  Attn:RR  Quote
09-21-2009 07:04 AM  11 years ago
aceisback

rrApprentice

Terre Haute, IN

MyPosts All Forum Topic
It will only cost about $50 in parts, but I am not building to sell. I just want something to help myself or others tach their helis if they are alone or just don't have anyone who can operate a heli tach properly. It would have 5 or so bright LEDs of different colors so that you could see at a glance what target RPM you are at while also recording the actual RPM so you can see it. I like to build things and this came to mind.

Anyway, I don't even know if I will get around to actually building it.

Thanks!
Duane
SHARE  PM  EMAIL  GALLERY  Attn:RR  Quote
09-21-2009 09:51 PM  11 years ago
Gearhead

rrMaster

Vt

MyPosts All Forum Topic
aceisback ,, my brother and I was going to do this 4 years ago, but I came to the conclusion that (for myself) buying a Governor would be 3 times-better, meaning I would have a Governor and know my Head Speed as well as knowing my Engine Speed,,

if you really want to do this there are a few large Electronic Distributors out there that sell small Counters and Tachometers that will work for you, these Counters and Tachometers are about as small as the Governors we use on our helis today, and these Tach's really don't cost that much at all, some are less than $20,,
one of these Tachometers could be setup to work off the Fan as well as the Main Shaft to tell you Engine RPM as well as HS, and yes you could probably set it up on the tail somewhere,,

the only problem I can see with this type of Tachometer is even tho it will give you an accurate HS reading in a hover it wont tell you at what point your Head is over Speeding or Under Speeding when in a Maneuver, this is the main reason why I decided to just buy Governors,, the Governor really is the better idea, set it and fly, and today's Governors like the Muligov are very well priced..

hope I have helped,, sorry I don't have the catalogs any more and I don't remember the Distributor's names
Jim
Buzz Buzz Buzz
SHARE  PM  EMAIL  GALLERY  Attn:RR  Quote
09-21-2009 10:03 PM  11 years ago
Gearhead

rrMaster

Vt

MyPosts All Forum Topic
Oh,, Ps,,
if you do a seach you will see in the past guys have used Bicycle Speedometers on Helis for Tachs, they work pretty slick, you have to find a SpeedO that reads over 100 MPH, and program it with a certain wheel size,, you will have to do a search to find the right number for the Wheel size..
Jim
Buzz Buzz Buzz
SHARE  PM  EMAIL  GALLERY  Attn:RR  Quote
09-21-2009 10:26 PM  11 years ago
Gearhead

rrMaster

Vt

MyPosts All Forum Topic
SHARE  PM  EMAIL  GALLERY  Attn:RR  Quote
09-22-2009 07:45 AM  11 years ago
Charlie

rrVeteran

New Brunswick, Canada

MyPosts All Forum Topic
but I am experimenting with a self contained device to attach to ANY heli and be able to see what the RPM is just by looking at the heli. This way, if someone all of a sudden says, I wonder what my head speed is, you could just strap this device to the heli and see without the need to attach magnets, sensors, etc. This could also be used when the pilot is flying alone and wants to check the RPM.
Something like this? I don't think it would be any good for micro's (if you can still buy it?).

SHARE  PM  EMAIL  GALLERY  Attn:RR  Quote
09-22-2009 04:50 PM  11 years ago
floop

rrVeteran

Southern, NJ

MyPosts All Forum Topic
do you have a diagram of how it would mount to the tail?IT's what I do.
SHARE  PM  EMAIL  HOMEPAGE  GALLERY  Attn:RR  Quote
09-22-2009 09:54 PM  11 years ago
Charlie

rrVeteran

New Brunswick, Canada

MyPosts All Forum Topic
I don't have a diagram, but if I remember right, all it did was clamp onto the tail boom.
SHARE  PM  EMAIL  GALLERY  Attn:RR  Quote
09-23-2009 12:02 AM  11 years ago
AFjetmech

rrNovice

Rocky Mount, N.C. USA

MyPosts All Forum Topic
I'm surprised radio manufactures like Spektrum have not incorporated a tach readout on the transmitter. With the 7100R already reading engine rpm, it would seem pretty simple to have that data sent right to the TX.
SHARE  PM  EMAIL  GALLERY  Attn:RR  Quote
09-23-2009 12:19 AM  11 years ago
ruddernate

rrKey Veteran

sulphur,Ok.

MyPosts All Forum Topic
to do that you would have to turn the rx into a tx/rx. then the price and size of our rx's would both go up. you will also have to turn the tx into a tx/rx instead of just a tx.fly it like you stole it
SHARE  PM  EMAIL  GALLERY  Attn:RR  Quote
09-23-2009 12:46 AM  11 years ago
Gearhead

rrMaster

Vt

MyPosts All Forum Topic
""I'm surprised radio manufactures like Spektrum have not incorporated a tach readout on the transmitter""

like I said, the governor is the better idea
Jim
Buzz Buzz Buzz
SHARE  PM  EMAIL  GALLERY  Attn:RR  Quote
09-23-2009 01:41 AM  11 years ago
AFjetmech

rrNovice

Rocky Mount, N.C. USA

MyPosts All Forum Topic
Sure the price would go up some, but who wouldn't want built in tach capability without having to add anything to the heli? I'd be willing to pay for it and with the advances in todays electronics it seems like it should be an easy thing to do. Of course, maybe I have no idea what I'm talking about.
SHARE  PM  EMAIL  GALLERY  Attn:RR  Quote
09-23-2009 04:58 AM  11 years ago
Gearhead

rrMaster

Vt

MyPosts All Forum Topic
""Of course, maybe I have no idea what I'm talking about""

well I can see why you want one, for the same reason I wanted one,, but you would have to hook it up the same way a Governor/Limiter is hooked up (with a magnet),, and or, there are Rev-Limiters out there that work well that cost like only $59,,
rather Governor or Limiter you set the Head Speed you want and the Gear Ratio you have so you will know the Engine RPM, the plus-side is you have the Governor/Limiter,, and believe me they work great,,

let me ask, what would you rather have ?? a Tach that tells you your engine is over speeding, or a Governor/Limiter that stops your engine from over speeding ?? with ether one you will know your Head Speed & Engine Speed...
Jim
Buzz Buzz Buzz
SHARE  PM  EMAIL  GALLERY  Attn:RR  Quote
09-23-2009 04:59 AM  11 years ago
ruddernate

rrKey Veteran

sulphur,Ok.

MyPosts All Forum Topic
i'm just thinking, an avg. rx costs around $100 and i'm guessing it would cost at least that to add a rx to the tx. then you're looking at the cost of a new tx + $100, plus a new rx+ $100. while it's a great idea, it just seems unpractical when you can get a gov. for less than $100 that will improve flight, and tell you your headspeed. of course, now i'm probably just overthinking this issue.fly it like you stole it
SHARE  PM  EMAIL  GALLERY  Attn:RR  Quote
WATCH
 2 pages [ <<    <    ( 1 )     2     NEXT    >> ] 1460 views Post Reply
Print TOPIC

 6  Topic Subscribe

Thursday, August 5 - 4:34 am - Copyright © 2000-2021 RunRyder   EMAILEnable Cookies

Login Here
 New Subscriptions 
 Buddies Online