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Main Discussion > Head speed with bike computer I need help
 
 
Sceadu1
Senior Heliman
Location: Rochester,Minnesota

Just got my sceadu parts in the mail yesterday so I tried out my new head speed computer today but somethings wrong with the reading. I got 373.53 max speed for kmh. I have it setup at 1667 for the wheel size , what am I doing wrong?Any Idea's? Thanks , Jerry
04-08-2002 Over year old.
 
 
RaptorHelius
Senior Heliman
Location: Regina, Saskatchewan, Canada

If I understand it correctly, then just move the decimal over a place...

3735 rpm??

sounds kinda high!
04-08-2002 Over year old.
 
 
Sceadu1
Senior Heliman
Location: Rochester,Minnesota

Head speed with a bike computer I need help

I understand the reading but why is it so high I can't beleave my head speed is that high. Any idea's why , something I might have set wrong?
Thanks , Jerry
04-08-2002 Over year old.
 
 
S76GUY
Senior Heliman
Location: UpState, NY

Head Speed

Ok I will bite.
What and how is this done?
I may have an idea.
How many blades do you have?
Tony T.
04-08-2002 Over year old.
HOMEPAGE  
 
 
S76GUY
Senior Heliman
Location: UpState, NY

Head speed

Is this thing reading in MPH?
And not in RPM's.
Tony T.
04-08-2002 Over year old.
HOMEPAGE  
 
 
Sceadu1
Senior Heliman
Location: Rochester,Minnesota

Head speed with bike computer I need help

Two blades.
Jerry
04-08-2002 Over year old.
 
 
Ricardo Forte
Heliman
Location: Brasil

No this below of the paddles ?
It will be 4 blades .
04-08-2002 Over year old.
 
 
S76GUY
Senior Heliman
Location: UpState, NY

Head speed

If it reads in RPMs
04-08-2002 Over year old.
HOMEPAGE  
 
 
Sceadu1
Senior Heliman
Location: Rochester,Minnesota

Head speed

It really dos'nt make a difference how many blades I have since the reading is taken off the main shaft by way of a magnet .I'am using a VDO Cytec 10 bike Computer if that helps someone who might have a Idea as too my problem. Thanks , Jerry
04-08-2002 Over year old.
 
 
RICH
Senior Heliman
Location: Ontario, Canada

How to do it

You must do 2 thing

1- set wheel size to 1667

2-make speed read in KPH not MPH.

that's all...the rpms will be the speed in KPH. the actual RPM will be missing one decimal place just add a zero. The Max KPH speed which in the rotor rpm will be exact. I have the VDO C08 cytec computer on mine.

Rich
04-08-2002 Over year old.
 
 
vapor
Heliman
Location: wi

head speed tach

It works !!! Just set it up like post above. I just milled out a slot on the bottom of main gear on my gasser for magnet and reballanced gear.
Wow 1900 rpm's and now i know why it flies like its on rails.
Vapor
04-08-2002 Over year old.
HOMEPAGE  
 
 
JCadwell
Key Veteran
Location: Richland WA/ Morro Bay, CA

how many magnets are you using? Half of your number is 1867...

Thanks, John Cadwell
04-08-2002 Over year old.
 
 
Sceadu1
Senior Heliman
Location: Rochester,Minnesota

Head speed

John
I'am using just one. Jerry
04-08-2002 Over year old.
 
 
dwaynet
Senior Heliman
Location: Fairfax, Virginia

Maybe you are on the "total distance traveled" screen. I used a SigmaSport and haven't had a bit of problems with it. If you are using 1667 wheel dia and KPH then it should read right. Check the directions for distance from magnet to pickup and make sure you are within that range.

Quote 
Ok I will bite. What and how is this done?


Complete info at:
http://www.acehobby.com/forum/topic.asp?TOPIC_ID=169

You can see my pics at:
http://www.freewebz.com/rcpilot/pics.htm

There was also a place on the net that compiled all the posts and pics in one spot, but I can't remember where it was.

Dwayne
04-08-2002 Over year old.
HOMEPAGE  
 
 
ben1000
Senior Heliman
Location: Gilbert, Arizona

Could be a couple of things..

1) If you are using a bolt through the main shaft, then the sensor could be reading both ends of the the bolt, because the magnet has magnetized the bolt. I think this would you give you a double reading (exactly twice the headspeed).

2) The sensor is EXTREMELY sensitive to vibration. Sometimes I would get REALLY high readings, because at certain vibrations, the sensor would turn on and off VERY quickly.

Best of luck

- Ben1000
04-08-2002 Over year old.
HOMEPAGE  
 
 
Sceadu1
Senior Heliman
Location: Rochester,Minnesota

Head speed

Ben1000

I think you might have something there . I'am using the main shaft bolt so how do I get it to read only one side? What if I change the wheel size to 8335 thats half of the 1667 i have now. Any Idea's? Thanks , Jerry
04-08-2002 Over year old.
 
 
ben1000
Senior Heliman
Location: Gilbert, Arizona

Try moving the sensor a little further away.

To be honest, the only way these things are reliable is if you check them every now and then against a real tach.

Regards,

- Ben1000
04-08-2002 Over year old.
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Virtual1
Senior Heliman
Location: Waterloo, Iowa - USA

Check to see if the bike computer wants your wheel circumference or wheel diameter. If it wants your diameter, that may be the problem since 1667 is circumference. Divide your reading by 3.14 (pi) and that would be around 1180rpm, quite slow but a more reasonable number.
04-08-2002 Over year old.
HOMEPAGE  
 
 
sweetP
Senior Heliman
Location: Sarasota,Florida

I like the bike computer idea. I have many questions.1 is the max speed program used for this measurement? Is the computer mounted to the tail boom with the handelbar mount? Can I use the cadence pickup on the tail rotor ? And should I increase my Heart Rate Monitors max heart rate alarm while doing scarey new 3-D stuff.

What was my tag line? AMA 139721
04-08-2002 Over year old.
 
 
heliraptor
Key Veteran
Location: Colchester, Essex, UK

Dwaynet come on !!

Hi ya

Dwayne I posted your pics on my site, thers a link off the front page. All the info is on their for the other questions.

Lee
04-08-2002 Over year old.
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