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#1
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Hobbs Meter with Airspeed activation
Hi,
I have a customer that has 2 2-seat (ASK-21) gliders for a commercial operation. He is trying to find for them "Hobbs meters" with switches that start allow the meter to record time only when in flight (over some airspeed threshold). Of course, it would not be ideal if it recorded when on the ground on a windy day. Any suggestions? I found some Hobbs meters with part number 85000C12 which operate on 10 to 30 VDC. But the switch is the tough part. Best Regards, Paul Remde Cumulus Soaring, Inc. |
#2
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Hobbs Meter with Airspeed activation
Why not install a GPS logger? It should be relatively easy to download the
data, and then parse it to give times of use. Something like FlyWithCE even has software to log your times. Peter "Paul Remde" wrote in message ... Hi, I have a customer that has 2 2-seat (ASK-21) gliders for a commercial operation. He is trying to find for them "Hobbs meters" with switches that start allow the meter to record time only when in flight (over some airspeed threshold). Of course, it would not be ideal if it recorded when on the ground on a windy day. Any suggestions? I found some Hobbs meters with part number 85000C12 which operate on 10 to 30 VDC. But the switch is the tough part. Best Regards, Paul Remde Cumulus Soaring, Inc. |
#3
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Hobbs Meter with Airspeed activation
On Aug 29, 12:36*pm, "Peter von Tresckow" wrote:
Why not install a GPS logger? It should be relatively easy to download the data, and then parse it to give times of use. Agreed. Except the customer in question probably wants to know the flight time immediately after Joe Glider Pilot 1 lands so that he can pay and leave. Also, the sooner Joe Glider Pilot 2 can fly the better. This would make the "download" part less than convenient. My suggestion: ask the XCsoar guys to implement a "total time in flight" feature. Then install it on a cheap car GPS and add a battery pack. Bart |
#4
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Hobbs Meter with Airspeed activation
I know you don't sell LX vario's anymore Paul but the LX16-D has a
built in flight timer function and is a nice little audio vario to boot. I put an LX16 in the Cherokee this season and have enjoyedit so far. http://www.lxavionics.co.uk/variometers.htm |
#5
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Hobbs Meter with Airspeed activation
On Aug 29, 3:09*pm, Tony wrote:
I know you don't sell LX vario's anymore Paul but the LX16-D has a built in flight timer function and is a nice little audio vario to boot. *I put an LX16 in the Cherokee this season and have enjoyedit so far. http://www.lxavionics.co.uk/variometers.htm another possible solution, and actually more in line with the original question and price range, would be to work out some sort of weight on wheels switch on the glider to run to the Hobbs meter linked. |
#6
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Hobbs Meter with Airspeed activation
On Mon, 29 Aug 2011 14:51:57 -0500, Bart wrote:
My suggestion: ask the XCsoar guys to implement a "total time in flight" feature. Then install it on a cheap car GPS and add a battery pack. Bart XC Soar already has a built-in flight timer (parameter "Time of Flight"). This can be displayed in any of the infoboxes. -- Stefan Murry |
#7
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Hobbs Meter with Airspeed activation
On Aug 29, 1:14*pm, "S. Murry" wrote:
XC Soar already has a built-in flight timer (parameter "Time of Flight"). * This can be displayed in any of the infoboxes. It does, indeed. But to be Hobbs equivalent it would have to be "total" or "cumulative" time of flight. Bart |
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Hobbs Meter with Airspeed activation
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#9
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Hobbs Meter with Airspeed activation
On Mon, 29 Aug 2011 15:18:41 -0500, Bart wrote:
It does, indeed. But to be Hobbs equivalent it would have to be "total" or "cumulative" time of flight. Bart True. Getting back to Paul's original question, how about using a pitot tube to a pressure switch. There are pressure switches made for HVAC ducts that are rated for pretty low pressure (quick search on Grainger revealed some that actuate with as little as 0.02 in WC pressure). Quick pitot calculation reveals that 20 MPH = 50 Pascals pitot pressure, or about 0.2 " WC, so such a switch should work. -- Stefan Murry |
#10
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Hobbs Meter with Airspeed activation
This calculator will help you work out the pitot pressures for different speeds. http://chrusion.com/BJ7/ASICalc.html Aircraft Spruce sell a range of suitable pressure switches, calibrated to your requirements, that can be firred to a pitot circuit.. I've flown several aircraft with Hobbs displaying time in the air - mainly for maintenance purposes. Some used the aircraft's main pitot (ASI) - others had a separate pitot for the Hobbs. At 20:45 29 August 2011, S. Murry wrote: On Mon, 29 Aug 2011 15:18:41 -0500, Bart wrote: It does, indeed. But to be Hobbs equivalent it would have to be "total" or "cumulative" time of flight. Bart True. Getting back to Paul's original question, how about using a pitot tube to a pressure switch. There are pressure switches made for HVAC ducts that are rated for pretty low pressure (quick search on Grainger revealed some that actuate with as little as 0.02 in WC pressure). Quick pitot calculation reveals that 20 MPH = 50 Pascals pitot pressure, or about 0.2 " WC, so such a switch should work. -- Stefan Murry |
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