Matronics Email Lists :: View topic - PCU 5000 able to command low rpm (<1700rpm)?

Matronics Email Lists
Web Forum Interface to the Matronics Email Lists

Get Email Distribution Too! FAQ Search Memberlist Usergroups Register

Profile Log in to check your private messages Log in

PCU 5000 able to command low rpm (<1700rpm)?

Matronics Email Lists Forum Index -> RV10-List

View previous topic :: View next topic

Author Message

TimRVator(at)comcast.net
Guest

Posted: Mon Sep 19, 2016 12:34 pm Post subject: PCU 5000 able to command low rpm (<1700rpm)?

I'm considering replacing my MT prop governor.  One thing I do like 

about the MT governor is you can pull the prop control back during 

engine out practice and the governor slows the engine way down (which 

extends glide).



I understand  (from owner comments and Hartzell tech support) that the 

Hartzell governor's minimum governing speed is about 1700 rpm. I'm 

interested in learning what minimum governing speed folks have seen on 

aircraft flying with the PCU 5000X.



-- 

Tim Lewis -- HEF (Manassas, VA)

A&P

RV-6A N47TD -- 1104 hrs - sold

RV-10 N31TD -- 740 hrs

- The Matronics RV10-List Email Forum -

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:

http://www.matronics.com/Navigator?RV10-List

carl.froehlich(at)verizon
Guest

Posted: Mon Sep 19, 2016 1:45 pm Post subject: PCU 5000 able to command low rpm (<1700rpm)?

That is about the RPM I see (RV-8A and RV-10) with the PCU-5000X.



Carl



 	  Quote: 	
		   On Sep 19, 2016, at 4:31 PM, Tim Lewis <TimRVator(at)comcast.net> wrote:

 

 

 

 I'm considering replacing my MT prop governor.  One thing I do like about the MT governor is you can pull the prop control back during engine out practice and the governor slows the engine way down (which extends glide).

 

 I understand  (from owner comments and Hartzell tech support) that the Hartzell governor's minimum governing speed is about 1700 rpm. I'm interested in learning what minimum governing speed folks have seen on aircraft flying with the PCU 5000X.

 

 -- 

 Tim Lewis -- HEF (Manassas, VA)

 A&P

 RV-6A N47TD -- 1104 hrs - sold

 RV-10 N31TD -- 740 hrs

- The Matronics RV10-List Email Forum -

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:

http://www.matronics.com/Navigator?RV10-List

TimRVator(at)comcast.net
Guest

Posted: Mon Sep 19, 2016 5:54 pm Post subject: PCU 5000 able to command low rpm (<1700rpm)?

Thanks, Carl.

I want to make sure I understand your reply correctly.  I do my runups 

at 1800.  If I pull the prop control back during runup, the MT 

governor/prop will slow the engine way down -- probably below 1000 rpm. 

   Certainly well below 1700 rpm.   Are you telling me that with the PCU 

5000, if pull the prop control all the way back (at runup, for example), 

your experience is the PCU5000 won't slow the engine below 1700 rpm?

Thanks very much for your insights.  I appreciate it.

Tim Lewis

-- 

Tim Lewis -- HEF (Manassas, VA)

A&P

RV-6A N47TD -- 1104 hrs - sold

RV-10 N31TD -- 740 hrs

Carl Froehlich wrote on 9/19/2016 5:43 PM:

 	  Quote: 	

 That is about the RPM I see (RV-8A and RV-10) with the PCU-5000X.

 Carl

> On Sep 19, 2016, at 4:31 PM, Tim Lewis <TimRVator(at)comcast.net> wrote:

>

> 

>

> I'm considering replacing my MT prop governor.  One thing I do like about the MT governor is you can pull the prop control back during engine out practice and the governor slows the engine way down (which extends glide).

>

> I understand  (from owner comments and Hartzell tech support) that the Hartzell governor's minimum governing speed is about 1700 rpm. I'm interested in learning what minimum governing speed folks have seen on aircraft flying with the PCU 5000X.

>

> -- 

> Tim Lewis -- HEF (Manassas, VA)

> A&P

> RV-6A N47TD -- 1104 hrs - sold

> RV-10 N31TD -- 740 hrs

>

- The Matronics RV10-List Email Forum -

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:

http://www.matronics.com/Navigator?RV10-List

carl.froehlich(at)verizon
Guest

Posted: Mon Sep 19, 2016 6:28 pm Post subject: PCU 5000 able to command low rpm (<1700rpm)?

I don't recall how far it will pull down the RPM - I only pull the prop

until a get a slight drop to make sure the governor is functioning.  I was

told (correctly or incorrectly) deep run up cycles are hard on props. 



Carl



--

- The Matronics RV10-List Email Forum -

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:

http://www.matronics.com/Navigator?RV10-List

TimRVator(at)comcast.net
Guest

Posted: Mon Sep 19, 2016 6:46 pm Post subject: PCU 5000 able to command low rpm (<1700rpm)?

Carl,



I was told the same.



If you get a chance, perhaps you can test this:  At 1000 rpm idle, can 

you pull the prop control and see if the prop governor will further slow 

the engine rpm.  If so, that's the info I'm looking for.



VR



Tim



-- 

Tim Lewis -- HEF (Manassas, VA)

A&P

RV-6A N47TD -- 1104 hrs - sold

RV-10 N31TD -- 740 hrs



Carl Froehlich wrote on 9/19/2016 10:26 PM:

[quote] 



 I don't recall how far it will pull down the RPM - I only pull the prop

 until a get a slight drop to make sure the governor is functioning.  I was

 told (correctly or incorrectly) deep run up cycles are hard on props.



 Carl



 --

- The Matronics RV10-List Email Forum -

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:

http://www.matronics.com/Navigator?RV10-List

Mauledriver(at)nc.rr.com
Guest

Posted: Tue Sep 20, 2016 3:20 am Post subject: PCU 5000 able to command low rpm (<1700rpm)?

On a similar note, I avoid running at       or below 1000 rpm to avoid lead fouling, which I am led to believe       can happen even when fully leaned.  

       

       While attending Lycoming Engine School, I followed up with the       instructor after his lead fouling discussion and came away with       the understanding that lead build-up will occur anytime combustion       chamber temperatures drop below a certain point.  He emphasized       that it happens very quickly based on some testing he was familiar       with.  He mentioned that that the practice of pulling the power       off at touchdown and leaving it there during the rollout is enough       to form visible deposits.  By the same token, heating things up       above the critical temperature soon after will cause most, but not       all of those new deposits to quickly evaporate away.

       

       This write-up from Shell       seems to support that thinking.

       

       As a result of the same thinking,  I've never practiced engine out       descents with the power pulled all the way and the prop slowed       anywhere near 1000 rpm.

       

       This former fixed pitch jockey handles the prop cycling task by       setting the power around 1500 rpms before cycling the prop.        During the cycle, the rpm drop just hits 1000 rpms as I move the       control forward.   And I try to not to imitate what I've seen some       CFIs do by slamming the prop control this way and that.  On my       engine a slower steady hand will do.  

       

       I've never been told that it's hard on the prop and don't believe       it is.  I have been told that I'm both checking function and       forcing some warm oil thru the controller so that it performs as       expected during takeoff.  Now I'm thinking the main task is just       to make sure it works without spraying oil all over the place but       honestly just don't really know.  I just do it.

       

       Bill "glider guider at  heart that has learned to love that big       'ol 540" Watson

       N215TG

       

       On 9/19/2016 10:26 PM, Carl Froehlich wrote:     

      	  Quote: 	
		          	  Quote: 	
		  

I don't recall how far it will pull down the RPM - I only pull the prop

until a get a slight drop to make sure the governor is functioning.  I was

told (correctly or incorrectly) deep run up cycles are hard on props. 



--> RV10-List message posted by: Tim Lewis <TimRVator(at)comcast.net> (TimRVator(at)comcast.net)



Thanks, Carl.



I want to make sure I understand your reply correctly.  I do my runups at

1800.  If I pull the prop control back during runup, the MT governor/prop

will slow the engine way down -- probably below 1000 rpm. 

   Certainly well below 1700 rpm.   Are you telling me that with the PCU 

5000, if pull the prop control all the way back (at runup, for example),

your experience is the PCU5000 won't slow the engine below 1700 rpm?



Thanks very much for your insights.  I appreciate it.



Tim Lewis

	
     	
     



            	 		 			 				 			 		 		 			

 				This email has been checked for viruses by Avast antivirus software. 				

www.avast.com

- The Matronics RV10-List Email Forum -

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:

http://www.matronics.com/Navigator?RV10-List

carl.froehlich(at)verizon
Guest

Posted: Wed Sep 21, 2016 12:18 pm Post subject: PCU 5000 able to command low rpm (<1700rpm)?

Well shoot fire Tim, on today's hop I did not remember what you asked.  This is what I did it if helps.  At the end of the 1800 RPM run up I pulled the prop all the way out.  The governor brought RPM down to below 1100 RPM.

Should do another hop Friday so I'll do your test then.

Carl

[quote] On Sep 19, 2016, at 10:45 PM, Tim Lewis <TimRVator(at)comcast.net> wrote:

 Carl,

 I was told the same.

 If you get a chance, perhaps you can test this:  At 1000 rpm idle, can you pull the prop control and see if the prop governor will further slow the engine rpm.  If so, that's the info I'm looking for.

 VR

 Tim

 -- 

 Tim Lewis -- HEF (Manassas, VA)

 A&P

 RV-6A N47TD -- 1104 hrs - sold

 RV-10 N31TD -- 740 hrs

 Carl Froehlich wrote on 9/19/2016 10:26 PM:

> 

> 

> I don't recall how far it will pull down the RPM - I only pull the prop

> until a get a slight drop to make sure the governor is functioning.  I was

> told (correctly or incorrectly) deep run up cycles are hard on props.

> 

> Carl

> 

> --

- The Matronics RV10-List Email Forum -

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:

http://www.matronics.com/Navigator?RV10-List

TimRVator(at)comcast.net
Guest

Posted: Wed Sep 21, 2016 3:03 pm Post subject: PCU 5000 able to command low rpm (<1700rpm)?

Thanks, Carl.  The data point you took today is very helpful to my .  I 

appreciate it.

-- 

Tim Lewis -- HEF (Manassas, VA)

A&P

RV-6A N47TD -- 1104 hrs - sold

RV-10 N31TD -- 740 hrs

Carl Froehlich wrote on 9/21/2016 4:14 PM:

[quote] 

 Well shoot fire Tim, on today's hop I did not remember what you asked.  This is what I did it if helps.  At the end of the 1800 RPM run up I pulled the prop all the way out.  The governor brought RPM down to below 1100 RPM.

 Should do another hop Friday so I'll do your test then.

 Carl

> On Sep 19, 2016, at 10:45 PM, Tim Lewis <TimRVator(at)comcast.net> wrote:

>

> 

>

> Carl,

>

> I was told the same.

>

> If you get a chance, perhaps you can test this:  At 1000 rpm idle, can you pull the prop control and see if the prop governor will further slow the engine rpm.  If so, that's the info I'm looking for.

>

> VR

>

> Tim

>

> -- 

> Tim Lewis -- HEF (Manassas, VA)

> A&P

> RV-6A N47TD -- 1104 hrs - sold

> RV-10 N31TD -- 740 hrs

>

> Carl Froehlich wrote on 9/19/2016 10:26 PM:

>> 

>>

>> I don't recall how far it will pull down the RPM - I only pull the prop

>> until a get a slight drop to make sure the governor is functioning.  I was

>> told (correctly or incorrectly) deep run up cycles are hard on props.

>>

>> Carl

>>

>> --

- The Matronics RV10-List Email Forum -

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:

http://www.matronics.com/Navigator?RV10-List

Display posts from previous:

	Matronics Email Lists Forum Index -> RV10-List	All times are GMT - 8 Hours
Page 1 of 1

Jump to:

You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot vote in polls in this forum
You cannot attach files in this forum
You can download files in this forum