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Prop ground clearance

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johngoodman

Joined: 18 Sep 2006
Posts: 530
Location: GA

Posted: Sun Oct 09, 2011 9:56 am Post subject: Prop ground clearance

Any suggestions on how to increase prop arc ground clearance?



The obvious one is a smaller prop, or a 3 blade, but how about a larger nose tire, or a slightly longer WD-1016 nose gear link assembly where it joins WD-1017....



John

_________________
#40572 Phase One complete in 2011

coop85(at)verizon.net
Guest

Posted: Sun Oct 09, 2011 10:42 am Post subject: Prop ground clearance

John,

   I don't remember having read any issues that folks have had with prop clearance, but if you are facing bumpy terrain or maybe a lot of rocks I would recommend against adjusting the nose wheel or nose gear assembly.  This would alter your sitting angle of attack and could result in getting airborne at a speed less than you would like.  A small change might not be significant, but just something to consider.  I suspect going with a 3 blade would be the safest course of action as you still have a known combination verses the other options.



Marcus



do not archive

On Oct 9, 2011, at 1:56 PM, johngoodman wrote:






Any suggestions on how to increase prop arc ground clearance?



The obvious one is a smaller prop, or a 3 blade, but how about a larger nose tire, or a slightly longer WD-1016 nose gear link assembly where it joins WD-1017....



John



--------

#40572 Phase One complete and flying.





Read this topic online here:



http://forums.matronics.com/viewtopic.php?p=354450#354450

taildragon(at)msn.com
Guest

Posted: Sun Oct 09, 2011 4:35 pm Post subject: Prop ground clearance

<?xml:namespace prefix="v" /><?xml:namespace prefix="o" /><![endif]-->  John,

  

 Do you have any vertical "play" in your nose gear? Vans calls for four  J-11968-14 nose gear elastomers and they included a fifth one for later. At 300  hours, I have just a little vertical play. I have 8" clearance from prop (2  blade) to ground when nose tire is inflated to 42 lbs. At 7 1/2 " clearance  I know the nose tire needs more air. I will add the fifth elastomer when I have  more vertical play or I no longer have at least 8" clearance when the nose tire  is properly inflated.

  

 Roger

 40291

 [quote]   ---

Strasnuts

Joined: 10 Feb 2009
Posts: 502
Location: Salt Lake City, UT

Posted: Sun Oct 09, 2011 8:51 pm Post subject: Prop ground clearance

I used all of the supplied elastomers on my kit????   Can't remember how many off hand.  I thought the extra aluminum washers  were supplied for later when the elastomer gets a little worn in.

 [quote]   ---

_________________
40936
RV-10 SB N801VR Flying
780 Hours
SuperSTOL 60 hours

Kellym

Joined: 10 Jan 2006
Posts: 1705
Location: Sun Lakes AZ

Posted: Sun Oct 09, 2011 9:36 pm Post subject: Prop ground clearance

My finish kit came with only 4 shock disks. I seriously doubt Van's 

would supply an extra. They now cost around $80-90 each, and they will 

never compress enough for you to install another. When you lose 1/2 inch 

in stack height, they are essentially worn out. You see, these are the 

exact same part number shock disks used on all three gear legs of a 

Mooney(3 on the nose, 4 on each main). At the weight of the short and 

intermediate older Mooneys they last 10-20 yrs. At the weight of the 

newest long body Mooneys they last 4-10 yrs. Difference is about 800 

extra pounds on the newer models. My E model Mooney has empty wt of 1645 

lbs, or slightly more than RV-10 empty, and has 52 gal fuel capacity, so 

its normal parked wt with full tanks is very comparable to an RV-10. I 

last changed shock disks in 1999, and they are still in good shape...no 

loss of stack height. The only supplier these days is Lord. Rapco used 

to make them, but theirs had reputation of not lasting as long, so 

didn't sell well, even though they were several bucks cheaper.



On 10/9/2011 9:47 PM, Seano wrote:

[quote] I used all of the supplied elastomers on my kit????  Can't remember 

 how many off hand.  I thought the extra aluminum washers were supplied 

 for later when the elastomer gets a little worn in.



     ---

_________________
Kelly McMullen
A&P/IA, EAA Tech Counselor # 5286
KCHD

taildragon(at)msn.com
Guest

Posted: Mon Oct 10, 2011 12:01 am Post subject: Prop ground clearance

<?xml:namespace prefix="v" /><?xml:namespace prefix="o" /><![endif]-->  I remembered wrong. You guys are exactly right. My bad. I went back to  section 46 and it is an extra U-1002 washer that Vans supplied for  after the elastomers "take a set".

  

 Roger

 40291

 [quote]   ---

johngoodman

Joined: 18 Sep 2006
Posts: 530
Location: GA

Posted: Mon Oct 10, 2011 4:38 am Post subject: Re: Prop ground clearance

Thanks for the response. The only practical way to change the strut would be making a slightly longer WD-1016. It's probably not a great idea.

My only reluctance for going to a three blade prop is my understanding that it would require another Phase One fly off - right?



John

_________________
#40572 Phase One complete in 2011

Kelly McMullen

Joined: 16 Apr 2008
Posts: 1188
Location: Sun Lakes AZ

Posted: Mon Oct 10, 2011 4:52 am Post subject: Prop ground clearance

In theory, yes. However, I believe for most ops limitations today that

is an additional 5 hours, not 40 hours.



On Mon, Oct 10, 2011 at 5:38 AM, johngoodman <johngoodman(at)earthlink.net> wrote:

 	  Quote: 	
		   



 Thanks for the response. The only practical way to change the strut would be making a slightly longer WD-1016. It's probably not a great idea.

 My only reluctance for going to a three blade prop is my understanding that it would require another Phase One fly off - right?



 John



 --------

 #40572 Phase One complete and flying.





 Read this topic online here:



 http://forums.matronics.com/viewtopic.php?p=354501#354501

_________________
Kelly McMullen
A&P/IA, EAA Tech Counselor
KCHD

n223rv(at)wolflakeairport
Guest

Posted: Mon Oct 10, 2011 5:05 am Post subject: Prop ground clearance

Read your operation limitations.  It should say in there, but typically a new prop requires only a 5 hour fly off.  At least that is how mine is written.



Do not archive



Sent from my iPhone



On Oct 10, 2011, at 8:38 AM, "johngoodman" <johngoodman(at)earthlink.net> wrote:



 	  Quote: 	
		   

 

 Thanks for the response. The only practical way to change the strut would be making a slightly longer WD-1016. It's probably not a great idea.

 My only reluctance for going to a three blade prop is my understanding that it would require another Phase One fly off - right?

 

 John

 

 --------

 #40572 Phase One complete and flying.

 

 

 

 

 Read this topic online here:

 

 http://forums.matronics.com/viewtopic.php?p=354501#354501

gipsowh(at)hotmail.com
Guest

Posted: Mon Oct 10, 2011 5:43 am Post subject: Prop ground clearance

John, I was required to fly 5 hours only in my original Phase I area and document in maintenance log when I changed props.



Bill Gipson



 	  Quote: 	
		   Subject: RV10-List: Re: Prop ground clearance

 From: johngoodman@earthlink.net

 Date: Mon, 10 Oct 2011 05:38:22 -0700

 To: rv10-list@matronics.com

 

 --> RV10-List message posted by: "johngoodman" <johngoodman@earthlink.net>

 

 Thanks for the response. The only practical way to change the strut would be making a slightly longer WD-1016. It's probably not a great idea.

 My only reluctance for going to a three blade prop is my understanding that it would require another Phase One fly off - right?

 

 John

 

 --------

 #40572 Phase One complete and flying.

 

 

 

 

 Read this topic online here:

 

 http://forums.matronics.com/viewtopic.php?p=354501#354501

 

 

 

 

 

 

 

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  [quote][b]

johngoodman

Joined: 18 Sep 2006
Posts: 530
Location: GA

Posted: Mon Oct 10, 2011 6:23 am Post subject: Re: Prop ground clearance

The big reason that another Phase One bothers me, is that insurance doesn't give full coverage in Phase One - we discovered that one when a guy had a fire the day before his inspection. Luckily he was under builder's risk and not Phase One.



John

_________________
#40572 Phase One complete in 2011

coop85(at)verizon.net
Guest

Posted: Mon Oct 10, 2011 7:04 am Post subject: Prop ground clearance

Probably worth asking the question, my experience is that most insurance companies won't cover for the first X number of hours, not specifically phase 1.  Since you are past that they may still provide coverage, or possibly consider switching companies (or at least threaten to do so).



Marcus



do not archive

On Oct 10, 2011, at 10:23 AM, johngoodman wrote:






The big reason that another Phase One bothers me, is that insurance doesn't give full coverage in Phase One - we discovered that one when a guy had a fire the day before his inspection. Luckily he was under builder's risk and not Phase One.



John



--------

#40572 Phase One complete and flying.





Read this topic online here:



http://forums.matronics.com/viewtopic.php?p=354515#354515

n223rv(at)wolflakeairport
Guest

Posted: Mon Oct 10, 2011 7:41 am Post subject: Prop ground clearance

I got my insurance through Tom Johnson at Air Power Insurance.  He gave me 3-4 competitive quotes, some had full coverage including Phase I, some excluded Phase I.  It was my choice as to my coverage......  



Sent from my iPhone



On Oct 10, 2011, at 11:00 AM, Marcus Cooper <coop85(at)verizon.net> wrote:



 	  Quote: 	
		   

 

 Probably worth asking the question, my experience is that most insurance companies won't cover for the first X number of hours, not specifically phase 1.  Since you are past that they may still provide coverage, or possibly consider switching companies (or at least threaten to do so).

 

 Marcus

 

 do not archive

 On Oct 10, 2011, at 10:23 AM, johngoodman wrote:

 

 

 

 The big reason that another Phase One bothers me, is that insurance doesn't give full coverage in Phase One - we discovered that one when a guy had a fire the day before his inspection. Luckily he was under builder's risk and not Phase One.

 

 John

 

 --------

 #40572 Phase One complete and flying.

 

 

 

 

 Read this topic online here:

 

 http://forums.matronics.com/viewtopic.php?p=354515#354515

MotoPOD

Joined: 26 Oct 2010
Posts: 3
Location: IL

Posted: Thu Oct 20, 2011 8:52 pm Post subject: Re: Prop ground clearance

John, how much ground clearance do you have? 



As a point of reference, FAR 23.925 provides ground clearance requirements for certified airplanes. At gross weight and forward CG, there should ideally be at least 7 inches. In addition, there should still be positive ground clearance at 1.5 g's. While this doesn't legally apply to experimentals, it provides a good benchmark to strive for.

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