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07-26-2020 08:19 PM  10 days ago
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pcinc

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Westfield, MA

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Tachometer
What’s everyone using These days to tach head speed?
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07-26-2020 11:25 PM  10 days ago
Rojoalfa

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Punta de Mata, Monagas-Venezuela

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Oh... Yes!

I'm using model avionic optical skytech.
Nice gadget!

You can measure rpm directly with two blades.
For more than that, you need to make some calculations.

/
Saludos cordiales,
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07-27-2020 01:58 AM  10 days ago
utahbob

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St. George Utah

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I'm still using my trusty old Miniature Aircraft skytach..just used it today!.had it for ?20 yrs.I do a great decending funnel!
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07-27-2020 09:09 AM  10 days ago
Girard Ibanez

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Tucson, Arizona (formally from Guam)

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Pick up a Western Robotics ... not cheap by any means but does 3, and 4 blades
Team Thunder Tiger
since 6/2005 to 12/2014
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07-27-2020 10:52 AM  10 days ago
fireblade918

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Sunderland-UK

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These are the radios I have with a built in Tacho, only if you are brave enough!

Bob

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07-28-2020 05:12 PM  9 days ago
bjacks

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Ft. Worth, Tex.

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Tach
Got 3 or 4 MA tachs, $35.00 shipped, there the newer ones. Bobby
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07-28-2020 08:11 PM  8 days ago
Rojoalfa

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Punta de Mata, Monagas-Venezuela

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Can we measure multi blades rotor RPM with an optical tach for two blades?

Yes, we can.

This is my approach.
I would appreciate your feedback.

There is some math involved in optic tach which give direct reading of two blades...

Model avionic give the reading directly for two blades. Internally, the tach divide by 2 the actual reading before showing on screen.

So, For more than two blades, you must multiply the reading by 2 and then divided that result by number of blades.
Keep in mind that is very important to put a mark in one blade as the reference.

With more than two blades, there are several rpm to get the "blade stop" which could be incorrect, so it is important to identify the "reference blade".

For example...

Suppose you need to set 1300 rpm on a three blades rotor with an optical tach for two blades.

Doing the math in reverse...

1300 x 3 / 2 = 1950 rpm

Ok, fly your helicopter and your two blade optical tach must read 1950 rpm, to obtain " blade stop" for your three blades rotor. Be careful that your reference blade is clearly seen on the gadget.

Other example...

Suppose you need to set 1200 rpm on a five blades rotor with an optical tach for two blades.

1200 x 5 / 2 = 3000 rpm

Ok, fly your helicopter and your two blade optical tach must read 3000 rpm, to obtain " blade stop" for your five blades rotor. Be careful that your reference blade is clearly seen on the gadget.

The limitation on this optical tach is the max RPM.

/
Saludos cordiales,
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07-29-2020 02:49 AM  8 days ago
shizack

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Aiken, SC USA

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Ancient GloBee Intellitach. It's an optical but it can only be used in sunlight or electric light on DC. AC light throws the reading way off. But I'm not planning on taching my 500 in my trailer anyway.A soul in tension is learning to fly
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07-29-2020 09:45 PM  7 days ago
pcinc

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Westfield, MA

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Thanks for all the ideas and input everyone. I have PM'd bjacks to purchase one of his MA tachs.
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07-31-2020 02:57 AM  6 days ago
utahbob

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St. George Utah

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💎Sustaining Member
You will like it..I've wasted alot of $$ on heli stuff in 26 yrs.; but that's one item that I don't regret buying!I do a great decending funnel!
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