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HeliTorque :: View topic - Datcons
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HeliTorque Forum Index » Flight Dynamics

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WhirlyGirl
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PostPosted: Thu Aug 04, 2005 9:22 am    Post subject: Datcons Reply with quote

Hello folks,

I was thinking about Datcons the other day, and was hoping someone would be able to answer these questions...

  1. Why do certain types, such as R22 count from turning the key, and others, such as R44 start counting when you lift the collective?

  2. Do all machines (even military helis) have them?

  3. What does Datcon stand for anyway?

Twas just a curious thought we were pondering on the other day.

WhirlyGirl Cool
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PostPosted: Thu Aug 04, 2005 3:13 pm    Post subject: Reply with quote

AFAIK, the R22's hour meter (a "Hobbs" make if I'm not mistaken) is driven off the engine oil pressure so it counts for all the time the engine is running. I guess the R44 uses the same measure as the Schweizer which has a skids counter that counts from the time the skids are off the ground ALTHOUGH the 300 has oleo struts and when the heli lifts, the skids come closer together and this moves a lever to start the meter and I don't think the R44 uses this method as the u/d is similar (but beefier) than the R22.
The 300 has a running meter in the cab on the binnacle lower left (for a P1 left seat model) and also the skids meter which is only visible through the front window as it's positioned on the back of the binnacle.

Datcon is a maker's name - perhaps derived from something like DATaCOuNter?

Dunno about military but since everything has to be logged for hour maintenance schedules, they must have a meter or six.

HTH

FF

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PostPosted: Thu Aug 04, 2005 3:49 pm    Post subject: Reply with quote

The R44 has a microswitch on the collective which activates the datcon, so the three conditions need to be be met. Switch, oil pressure and collective up.
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PostPosted: Thu Aug 04, 2005 6:31 pm    Post subject: Reply with quote

Thanks JTL - that clears that up!

I feel that is the fairest way on the SFH pilot and learner as you pay for time by the meter - on the R22 your time starts at engine fire-up and you spend about 0.1 at each end of the sortie on startup and shutdown which costs you yet is really only ground function, not flying. Spose that when in control. it's technically 'flying' whether you are in startup/shutdown but it is an arguable point..

Happy now WGirl?

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PostPosted: Thu Aug 04, 2005 6:58 pm    Post subject: Datcon Reply with quote

Hi Guys,

At Heliair we charge R22 on Datcon time.
That's because the aircraft is lifed to 2200 hrs, so we charge for it's hours of life.

However, 45 hours flight time is needed to get a PPL so 45 hours datcom time is not enough.
You therefore require 49.5 hours min for your PPL.

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PostPosted: Thu Aug 04, 2005 7:05 pm    Post subject: Reply with quote

But what we were confused about was WHY on an R44 it doesn't start counting when you turn the key. This is obviously something that Robinson have built in to the R44 but not the R22. It seems strange that they are the same manufacturer and yet the datcons work differently.

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PostPosted: Thu Aug 04, 2005 7:10 pm    Post subject: Reply with quote

Hi WG

Send a letter to Robinson!

Different engine in R44 hint

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PostPosted: Thu Aug 04, 2005 7:52 pm    Post subject: Reply with quote

So which helicopter types do we know of that:

a) count from engine start?

b) count from collective up?

c) don't count at all?


I only ask out of interest! Wink

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PostPosted: Thu Aug 04, 2005 8:05 pm    Post subject: Reply with quote

Couple of things to clear up..

DATCon stands for "Dimensional And Time CONtrol". It is now a brand of Maxima Technologies. If you're interested, there's a "History" page on http://www.datcon.com/

Hobbs is a brand of Honeywell, their website is here
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PostPosted: Thu Aug 04, 2005 11:10 pm    Post subject: Reply with quote

I'll get me coat...

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PostPosted: Fri Aug 05, 2005 8:03 am    Post subject: Reply with quote

Very Happy Wink Cool Laughing
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PostPosted: Fri Aug 05, 2005 11:29 am    Post subject: Reply with quote

The DATCON is a meter designed to show how fast your wages are disappearing from your Bank / Building Society account. They are particularly enjoyable to watch during the warmup / cooldown phase in the R22...

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PostPosted: Fri Aug 05, 2005 11:57 am    Post subject: Reply with quote

Especially when you're doing a test and the FE takes 15 minutes to realise you're turning and burning! May as well be burning bank notes!! Wink

The joys of flying...

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PostPosted: Tue Aug 23, 2005 7:03 am    Post subject: New Currency Reply with quote

Perhaps we should use "datacon" as a new currency! Laughing 1 Datacon =??240.00 So how much was your holiday in Greece....4 Datacons!!Just bought a new flat......65 datacons and so on . On a serious note you will be aware that in your Log for the aircraft you subtract .1 when entering the time on an R22.
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PostPosted: Tue Aug 23, 2005 7:59 am    Post subject: Re: New Currency Reply with quote

Autorotate wrote:
On a serious note you will be aware that in your Log for the aircraft you subtract .1 when entering the time on an R22.


Personal logbook or tech log? I have never heard that before. Does that mean the place you are hiring it from should not charge you for the first 0.1?

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