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Hobbs power source

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Catz631(at)aol.com
Guest

Posted: Wed Mar 26, 2008 5:07 am Post subject: Hobbs power source

I bought an item from Spruce called a PowerGenie. It is an electrical device that fits between the regulator and the positive post of the battery and a third wire going to the hobbs as power. I guess it senses when the engine is charging the battery and opens up power to the Hobbs thus negating the use of an oil pressure switch which I removed from my engine. Has anyone used one of these? Which wire would it connect to on the rectifier as the directions only specify connecting to the plus wire coming from a regulator? I sure don't want to mess up my electric's as it is pretty much "magic" to me.

   For a little background, I went to Lockwoods Rotax school and their display engine, which we tore apart, was obtained from an owner who had the Hobbs sender and oil pressure sender on a brass adapter going into the oil pressure sensing hole. The Hobbs should have been plugged into the oil hole supplying oil to the propeller (constant speed) if it was not needed. Anyway this two into one brass fitting did not hold, broke off, drained all the oil in the engine. Rotax engines do not like having no oil!

   When I got back home, I checked my engine and walaa I had the same setup (my Kitfox was a recent purchase) I got rid of the brass adapter, Hobbs oil pressure sender and connected the Hobbs to the master switch. This PowerGenie device is an attempt to have the meter running only when the engine is. It's a nice idea if it works as I have left my master on for a short time from time to time and I don't want to add engine time when it is not running. Any feedback would be greatly appreciated !

                                                Dick Maddux

                                                Kitfox4-1200

                                                Rotax912UL

                                                Pensacola,Fl



Create a Home Theater Like the Pros. Watch the video on AOL Home.

  [quote][b]

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ruruny(at)aol.com
Guest

Posted: Wed Mar 26, 2008 2:11 pm Post subject: Hobbs power source

Dick,

 

 I installed one of these on my Zenith CH-701 with a Rotax 912UL. As long as the engine is charging

 your hobbs meter will run. I found a problem with the installation with the capacitor used on

 the rotax installation(my installation).When the engine is shut down and every thing turned off

 the charge in the capacitor keeps the hobbs running for a period of time. I haven't thought of a

 way to fix this yet, or have even tried. When I get home I will look at my wiring diagrams and

 let you know how mine is installed, just can't remember offhand.

 Take a look at my website at:

 

 http://www.701builder.com and you might see a pic of installation under electrical or instrument panel.

                                          Don't forget to sign the guestbook.

 Brian Unruh

 Long Island, NY

 

 

 I bought an item from Spruce called a PowerGenie. It is an electrical device 

 that fits between the regulator and the positive post of the battery and a 

 third wire going to the hobbs as power. I guess it senses when the engine is 

 charging the battery and opens up power to the Hobbs thus negating the use of anPlanning your summer road trip? Check out AOL Travel Guides. 

  [quote][b]

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ruruny(at)aol.com
Guest

Posted: Wed Mar 26, 2008 2:23 pm Post subject: Hobbs power source

Actually go to

 

 

 http://www.701builder.com/electrical04.htm

 

 Scroll down to the 13th pic, its the thing with the red, yellow, blue wires comming out of it.

 I installed it right behind the hobbs. You really cannot see how its wired here. I'll look the 

 diagrams tonight.

 

 BrianPlanning your summer road trip? Check out AOL Travel Guides. 

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Tommy Walker

Joined: 12 Jan 2006
Posts: 442
Location: Anniston, AL 36207

Posted: Thu Mar 27, 2008 5:11 am Post subject: Hobbs power source

Hi,  

   

I got a power-genie that I bought for the same reason on my 912.  

   

I threw it in the trash can yesterday.  If you want it, I will get it out and mail it to you.  I could never get it to work.  

   

I have another home made solution that I plan to try.  I got it from George on the Zenith list.  I can send it to you if you want.  

   

Take care,  

   

J  

   

   

   

Tommy Walker in Alabama  

N8701  40.5 Hrs  

   

   

   

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_________________
Tommy Walker
N25A - Anniston, AL

hdwysong(at)gmail.com
Guest

Posted: Thu Mar 27, 2008 8:13 pm Post subject: Hobbs power source

Thanks for the info on the PowerGenie, Dick.  Report back once you

have it integrated.



We replaced the stock pressure sender on our 914 with a remotely

mounted VDO-360025 ($25 from Summit Racing).  Same form factor as the

stock sensor but it has an extra terminal on top that serves as a low

pressure "warning contact" that opens above 11.5 psi.  Instead of

adding a Genie, we added a SPDT relay.



The power that supplies out turbo control unit also feeds the coil and

common tap on the SPDT relay.  Our "Low Pressure" annunciator is

attached to the normally open contact while the Hobbs is tied to the

normally closed contact.  When the system is powered and pressure is <

11.5 psi, the "warning contact" on the sender is closed and the relay

coil is energized (light on, Hobbs off).  When pressure is > 11.5 psi,

the "warning contact" opens and the relay coil is deenergized (light

off, Hobbs on).



Yet another option for the pile.



D

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Catz631(at)aol.com
Guest

Posted: Fri Mar 28, 2008 4:45 am Post subject: Hobbs power source

Tommy and "D" thanks for your replies. I am going to send the PowerGenie back to Spruce as I have received too many replies about it not working. Tommy I would be interested in the other solution."D" after reading your solution I had to have another cup of coffee and ask'what did he say?' You must be an engineer! I am an old retired pilot and need things simply explained to me. I will look up the VDO 360025 though. I think I got the general idea.

                             

                                                Dick Maddux

                                                Kitfox 4-1200

                                                Rotax912UL

                                                Pensacola,Fl



Create a Home Theater Like the Pros. Watch the video on AOL Home.

  [quote][b]

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Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:

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Tommy Walker

Joined: 12 Jan 2006
Posts: 442
Location: Anniston, AL 36207

Posted: Sat Mar 29, 2008 11:02 am Post subject: Hobbs power source

Dick  

   

I sent the drawings to your email address.  

   

Let us know how it works for you.  

   

Tommy Walker in Alabama  

N8701   40.5 Hrs.  

   

CH701 & Rotax 912ULS  

   

       [quote][b]

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_________________
Tommy Walker
N25A - Anniston, AL

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