Key got left on after I did some wiring work in my experimental project and ran up 26 hours on my brand new hobbs. Any way to zero them back out or I am stuck doing math all the time? It's just standard Honeywell Hobbs but could not find anything using Google.

You can take it apart and set it where you want or they are not that expensive.

Hour Meters and Controls
[email protected]
(phone #217-753-7773)

ask her maybe she can answer it. Some of the untits are sealed. Might hafta get a new one or deal with it being off the 26 hrs.

Jeff

I would think you would want to wire your hobbs to your oil pressure sensor so it would only work when the engine was running?

bcpstudent wrote:I would think you would want to wire your hobbs to your oil pressure sensor so it would only work when the engine was running?

I'm thinking it might be something that doesn't have any oil pressure

What difference does it make? Most mechanics go by TACH time, not Hobbs time, when it comes to maintenance requirements, which generally saves you some $$ anyway. You do have a tach??

MTV

What difference does it make? Most mechanics go by TACH time, not Hobbs time, when it comes to maintenance requirements, which generally saves you some $$ anyway. You do have a tach??


True enough.

Talking about an experimental here.. two stroke Rotax.. no oil pressure, simple tach with no time, I'm the mechanic, ect, ect. I just thought it might be as simple as it was to calibrate my altimeter. I'll either suck it up or spend the $50 for a new one. Doesn't get much simplier than this

Unplug it for the next 24 hours and keep a log with your watch.

Baddog wrote:Unplug it for the next 24 hours and keep a log with your watch.

Now you're talking. Good practical advice!

tom

Thats a cheap way to fly off that initial 40 hrs

Baddog wrote:Unplug it for the next 24 hours and keep a log with your watch.

Your Garmin has a flight log use that for next 24 hours.

Not sure if it will run backwards but have you tried wiring it backwards and see if it will run in reverse?
Keith

You could also wire in an airflow activated microswitch that would only log time when you were in forward flight.

WWhunter wrote:Not sure if it will run backwards but have you tried wiring it backwards and see if it will run in reverse?
Keith

It won't, I tried it with a 9V battery, reverse the polarity and it didn't do anything. I assume it has a diode in it? I'm looking at one on my desk, to get into it, you would have to pry off the edges of the metal cover. I doubt you could get it back together and it look right. Best plan is to fly the first 26 hours with it disconnected and then plug it back in as suggested earlier.

Kenny Chapman wrote:You could also wire in an airflow activated microswitch that would only log time when you were in forward flight.

Then maybe if I flew backwards the time would count off?????

I think unplugging it for 24 hours of flight is the best advice. They are made so that you can't tamper with them without destroying them. Be careful asking certified guys about experimental aircraft, you will almost always get the wrong advice. Almost.

Try these guys: http://www.homebuiltairplanes.com/forums/

AvidFlyer wrote:Key got left on after I did some wiring work in my experimental project and ran up 26 hours on my brand new hobbs. Any way to zero them back out or I am stuck doing math all the time? It's just standard Honeywell Hobbs but could not find anything using Google.

I don't know how your wiring is set up, but it should be possible to pull power for your hobbs directly from the lighting coil on your rotax. This would then only clock time when the engine is running. Depending on the type of Hobbs meter you have you may need to add an inexpensive rectifier. There is some good information on wiring hobbs meters in the CPS catalog. I know a guy that left his battery switch on and ran over 200hrs on the meter . Kinda hurts the resell value on a two stroker.

Nick

About a hundred years ago when I was in High school, I dated a girl who drove a Corvair. Her dad would check the mileage all the time so when she ran around and used up more than she was supposed to she would go around in circles in reverse in the parking lot until she had run off the extra miles.

Made her dizzy as hell but it was fun to watch.

Try that, put her in a tight turn going backwards and watch the time run off.

give it to someone that has a pusher for the next 20ish hrs, know anyone with a velocity?