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PCU5000X Caution

 
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zackrv8



Joined: 14 Jan 2006
Posts: 133

PostPosted: Mon Jul 30, 2007 2:02 pm    Post subject: PCU5000X Caution Reply with quote

I was hooking up my PCU5000X Prop Governor today and noticed the arm movement to go from flat pitch to coarse pitch is wrong. When I ordered the governor, I told them I was putting it on a IO-540 for a RV10. They sent me the part number that is listed on their website for an RV10., P-520-037/AL (http://pcu5000.com/pcu5000x.htm). After a conversation on the phone with Rick at Aero Technologies, the RV10 will need a different part number.

So, I have to send the incorrect prop gov back and they said they will send the correct one. They correct one will have the prop control arm go from flat pitch to coarse pitch in a counter clockwise motion.

Zack


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ricksked(at)embarqmail.co
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PostPosted: Mon Jul 30, 2007 4:23 pm    Post subject: PCU5000X Caution Reply with quote

Just to make sure, isn't the governor spring loaded to the low pitch position? Deem's pointed out the possibility of having the direction reversed if you had to rotate the arm more than 180 degrees to get it out in front like the plans show. This what happened ZACK?

Rick S.
40185
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zackrv8



Joined: 14 Jan 2006
Posts: 133

PostPosted: Mon Jul 30, 2007 5:36 pm    Post subject: Re: PCU5000X Caution Reply with quote

Rick,

You are correct about the gov being spring loaded to the flat pitch position. This is what I have. However, my gov is spring loaded to the flat pitch position opposite of what it should be to work on the Rv10 correctly.

Take a close look at the pictures below. Deem's plane has the correct gov. My gov is opposite of his. My gov rotates clockwise to coarse pitch. It should rotate CCW.

The arm is easy to reposition. All you do is loosen up the 6 screws and rotate it to your desired position. However, it still needs to rotate CCW to work on the RV10 correctly.

Zack


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PostPosted: Mon Jul 30, 2007 5:57 pm    Post subject: PCU5000X Caution Reply with quote

Sure enough...MY MT was OK from Van's only thing we had to do to it was roate the arm then , hopefully not, adjust the RPM if needed. Just incase anyone missed the narrow deck/wide deck gov. discussions on the model purchased from Van's.

BTW, I received Dave's(Rivethead) parts...Things of beauty, now I KNOW I have to get my own lathe and mill...

Rick S.
40185
do not archive
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Albert Gardner



Joined: 10 Jan 2006
Posts: 455
Location: Yuma, AZ

PostPosted: Tue Jul 31, 2007 7:34 am    Post subject: PCU5000X Caution Reply with quote

I missed the wide deck/narrow deck discussion but Zack's msg made me
concerned about my PCU5000. I called John at Aero Technologies for
clarification (800-323-4130). Here is what he told me.

Narrow deck engines require the .895 to 1 ratio, wide deck the .947 to 1.
The governor arm can be repositioned by loosening the 6 screws and rotating
the head but direction of rotation is done at the factory. Direction of
rotation depends on whether you attach the cable from below or above the
governor. The center shaft moves out away from the body of the PCU going to
coarse pitch.

John said if you have a PCU5000 with the incorrect ratio, one full turn on
the fine pitch stop will correct the rpm. 1 turn out will increase rpm, 1
turn in will decrease it.

So it turns out even if I have the wrong ratio, I don't need to return the
unit.

Albert Gardner
Yuma, AZ
N991RV painting.

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