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Throttle Cable length - short

 
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AirMike



Joined: 27 Feb 2007
Posts: 514
Location: Nevada

PostPosted: Thu Apr 09, 2009 1:43 am    Post subject: Throttle Cable length - short Reply with quote

Using a standard Van's panel mounted throttle (no quadrant), it fits very tight in the engine compartment. I can install it and get the threads inserted properly, but it will definitely rub and chafe on the bottom of the engine case. Anyone else had this same issue. It could definitely use an extra 3/4 of an inch in length. The prop & mixture were fine

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jkreidler



Joined: 13 Feb 2008
Posts: 151
Location: Sheboygan Falls WI

PostPosted: Thu Apr 09, 2009 4:05 am    Post subject: Throttle Cable length - short Reply with quote

We had the same problem, we ordered the cable called for on the RV-7, and it worked perfect.

I think by trying to use the shorter cable it forces the throttle arm to a more horizontal position while at idle. This make the throttle more difficult to advance at low power settings, almost like you need to push on the throttle hard enough to get the arm to go over center. Ideally the angle between the cable and the throttle arm while the throttle cable is advanced half way is 90 degrees. Making the angle of the cable to the throttle arm at idle approximately 135 degrees, and at wide open throttle approximately 45 degrees. I think the standard cable forces the angle while at idle to be something like 160 degrees, which is the cause of the 'over center' feeling. I am not suggesting that it will ever approach an over center condition, just that it fells like it is approaching an over center condition. The aircraft we took transition training in had a throttle that was harder to advance for the first one third of travel. Not a big deal, just the sort of perfection we all strive for.

BTW, Vans indicated "They have never had this come up before on the RV-10". I posted this question to the list a while back, and found one or two others with the same problem. Anyone need a standard length RV-10 throttle cable?

Thanks, Jason Kreidler

It runs, weight and balance complete, transition training done, doing minor finishing and calibrations, waiting on paperwork.

#40617 N44YH
Sheboygan Falls, WI
(4) Partner Build
Jason Kreidler
Kyle Hokel
Tony Kolar
Wayne Elsner [quote][b]


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PostPosted: Thu Apr 09, 2009 4:30 am    Post subject: Throttle Cable length - short Reply with quote

I installed the quadrant and found the mixture and throttle cables tight, They easily could have used another inch. I did cut a section of flexible tubing/high temp spiral wrap over the cables where they might have chaffed.

From: owner-rv10-list-server(at)matronics.com [mailto:owner-rv10-list-server(at)matronics.com] On Behalf Of jason.kreidler(at)regalbeloit.com
Sent: Thursday, April 09, 2009 5:01 AM
To: rv10-list(at)matronics.com
Subject: Re: Throttle Cable length - short


We had the same problem, we ordered the cable called for on the RV-7, and it worked perfect.

I think by trying to use the shorter cable it forces the throttle arm to a more horizontal position while at idle. This make the throttle more difficult to advance at low power settings, almost like you need to push on the throttle hard enough to get the arm to go over center. Ideally the angle between the cable and the throttle arm while the throttle cable is advanced half way is 90 degrees. Making the angle of the cable to the throttle arm at idle approximately 135 degrees, and at wide open throttle approximately 45 degrees. I think the standard cable forces the angle while at idle to be something like 160 degrees, which is the cause of the 'over center' feeling. I am not suggesting that it will ever approach an over center condition, just that it fells like it is approaching an over center condition. The aircraft we took transition training in had a throttle that was harder to advance for the first one third of travel. Not a big deal, just the sort of perfection we all strive for.

BTW, Vans indicated "They have never had this come up before on the RV-10". I posted this question to the list a while back, and found one or two others with the same problem. Anyone need a standard length RV-10 throttle cable?

Thanks, Jason Kreidler

It runs, weight and balance complete, transition training done, doing minor finishing and calibrations, waiting on paperwork.

#40617 N44YH
Sheboygan Falls, WI
(4) Partner Build
Jason Kreidler
Kyle Hokel
Tony Kolar
Wayne Elsner [quote]

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PostPosted: Thu Apr 09, 2009 6:26 am    Post subject: Throttle Cable length - short Reply with quote

Hi Mike C
 
I had the same problem. Ended up reclocking the throttle arm (for best travel/leverage) and installing a cushion clamp C to hold the cable C  in a spare threaded mounting hole in the bottom rear of the oil sump (these are coarse threads.)
 
The hard one for me has been the mixture control.
 
Vern Smith (finishing #324)
  
[quote] Subject: Throttle Cable length - short
From: Mikeabel(at)Pacbell.net
Date: Thu C 9 Apr 2009 02:43:39 -0700
To: rv10-list(at)matronics.com

--> RV10-List message posted by: "AirMike" <Mikeabel(at)Pacbell.net>

Using a standard Van's panel mounted throttle (no quadrant) C it fits very tight in the engine compartment. I can install it and get the threads inserted properly C but it will definitely rub and chafe on the bottom of the engine case. Anyone else had this same issue. It could definitely use an extra 3/4 of an inch in length. The prop & mixture were fine

--------
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Q/B Kit - FWF end game




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AirMike



Joined: 27 Feb 2007
Posts: 514
Location: Nevada

PostPosted: Thu Oct 18, 2012 5:04 am    Post subject: Throttle Cable length - short Reply with quote

Sure enough, my Vans OEM 47.5" throttle cable has chaffed through the metal shroud. This, discovered during my annual condition inspection. The Vans web site still shows the, too short 47.5" cable as the suggestion for the RV10, but it is obvious that this is a poor choice. It chaffed through on the bottom of the engine oil case. The suggested replacement on prior blogs is to get the RV7 cable as a replacement which is 50.5" long. Any other suggestions appreciated.

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PostPosted: Thu Oct 18, 2012 5:29 am    Post subject: Throttle Cable length - short Reply with quote

I got the next longer cable listed on the Van's web site and it works fine. I don't remember if it was the RV-7 one or not.

I sent a note to Van's on the recommended throttle cable being too short - my reply was "a lot of people use it so you must have changed something".

Carl

On Oct 18, 2012, at 9:04 AM, "AirMike" <Mikeabel(at)Pacbell.net> wrote:

Quote:


Sure enough, my Vans OEM 47.5" throttle cable has chaffed through the metal shroud. This, discovered during my annual condition inspection. The Vans web site still shows the, too short 47.5" cable as the suggestion for the RV10, but it is obvious that this is a poor choice. It chaffed through on the bottom of the engine oil case. The suggested replacement on prior blogs is to get the RV7 cable as a replacement which is 50.5" long. Any other suggestions appreciated.

--------
See you OSH '13
Q/B - flying 3 yrs.




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PostPosted: Thu Oct 18, 2012 5:34 am    Post subject: Throttle Cable length - short Reply with quote

That's a departure from their normal "We've never heard of that before."
reply.
It's always 'Kill the messenger".
Linn

On 10/18/2012 9:29 AM, Carl Froehlich wrote:
Quote:


I got the next longer cable listed on the Van's web site and it works fine. I don't remember if it was the RV-7 one or not.

I sent a note to Van's on the recommended throttle cable being too short - my reply was "a lot of people use it so you must have changed something".

Carl

On Oct 18, 2012, at 9:04 AM, "AirMike" <Mikeabel(at)Pacbell.net> wrote:

>
>
> Sure enough, my Vans OEM 47.5" throttle cable has chaffed through the metal shroud. This, discovered during my annual condition inspection. The Vans web site still shows the, too short 47.5" cable as the suggestion for the RV10, but it is obvious that this is a poor choice. It chaffed through on the bottom of the engine oil case. The suggested replacement on prior blogs is to get the RV7 cable as a replacement which is 50.5" long. Any other suggestions appreciated.
>
> --------
> See you OSH '13
> Q/B - flying 3 yrs.
>
>
> Read this topic online here:
>
> http://forums.matronics.com/viewtopic.php?p=385618#385618
>
>
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Kellym



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

PostPosted: Thu Oct 18, 2012 6:50 am    Post subject: Throttle Cable length - short Reply with quote

Now that you know the range of length needed, you can get a good cable
from McFarlane. They make a 4 ft length as stock, or will make exact
length you want.
You can get stock push pull cable, button release vernier cable, or
their new combo push pull/vernier with no release button.
http://www.mcfarlane-aviation.com

On 10/18/2012 6:04 AM, AirMike wrote:
Quote:


Sure enough, my Vans OEM 47.5" throttle cable has chaffed through the metal shroud. This, discovered during my annual condition inspection. The Vans web site still shows the, too short 47.5" cable as the suggestion for the RV10, but it is obvious that this is a poor choice. It chaffed through on the bottom of the engine oil case. The suggested replacement on prior blogs is to get the RV7 cable as a replacement which is 50.5" long. Any other suggestions appreciated.

--------
See you OSH '13
Q/B - flying 3 yrs.


Read this topic online here:

http://forums.matronics.com/viewtopic.php?p=385618#385618



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Bob Turner



Joined: 03 Jan 2009
Posts: 885
Location: Castro Valley, CA

PostPosted: Thu Oct 18, 2012 4:34 pm    Post subject: Re: Throttle Cable length - short Reply with quote

"We've never heard of this before" is just wrong.

My throttle and mixture cables were both too short (absolutely stock build, standard QB fuselage, Van's supplied engine and mount), and I exchanged numerous emails and photos with Vans and they were perplexed. I cannot tell where the QC problem is, if the cables are varying, or the engines, or what.

I was able to make it work by moving the arms (not over center) a bit and by using a more direct routing than shown in the instructions. I have applied RTV and Adel clamps (not tight) in places to try to protect the cable from abrasion. So far (100 hours) so good. But at some point in time I will replace them with longer ones.

Bob


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Kellym



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

PostPosted: Thu Oct 18, 2012 4:44 pm    Post subject: Throttle Cable length - short Reply with quote

I don't know, but I suspect that everything is based on 410RV which has
a narrow deck engine. That is why the prop governor as delivered isn't
correct, and so on., since all engines Vans sells are wide deck. It
shouldn't matter on the throttle or mixture, but stranger things have
happened. The other area that can vary is where the piece mounting the
cables to the instrument panel is located and how it is oriented.

On 10/18/2012 5:34 PM, Bob Turner wrote:
Quote:


"We've never heard of this before" is just wrong.

My throttle and mixture cables were both too short (absolutely stock build, standard QB fuselage, Van's supplied engine and mount), and I exchanged numerous emails and photos with Vans and they were perplexed. I cannot tell where the QC problem is, if the cables are varying, or the engines, or what.

I was able to make it work by moving the arms (not over center) a bit and by using a more direct routing than shown in the instructions. I have applied RTV and Adel clamps (not tight) in places to try to protect the cable from abrasion. So far (100 hours) so good. But at some point in time I will replace them with longer ones.

Bob

--------
Bob Turner
RV-10 QB


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PostPosted: Thu Oct 18, 2012 5:06 pm    Post subject: Throttle Cable length - short Reply with quote

You may be on to something, I have a narrow deck, which might explain why I
never had an issue with either the prop nor the throttle cables. I happen
to have checked both last week as I go through my condition inspection and
they looked fine, the rubber donuts look a little cracked up however but the
cables look fine.
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Strasnuts



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

PostPosted: Thu Oct 18, 2012 5:27 pm    Post subject: Throttle Cable length - short Reply with quote

I have a wide deck and stock cables. They work good and were plenty long. 270 hours.

Sent from my iPhone

On Oct 18, 2012, at 19:05, "Pascal" <rv10flyer(at)live.com> wrote:

[quote]

You may be on to something, I have a narrow deck, which might explain why I never had an issue with either the prop nor the throttle cables. I happen to have checked both last week as I go through my condition inspection and they looked fine, the rubber donuts look a little cracked up however but the cables look fine.


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Tim Olson



Joined: 25 Jan 2007
Posts: 2872

PostPosted: Thu Oct 18, 2012 8:10 pm    Post subject: Throttle Cable length - short Reply with quote

I'm not sure what deck I have, but I replaced my cables
this year and I bought all of the standard Van's lengths
for my quadrant install. On my particular install, I
certainly wouldn't want to add any length. I did have
some chafing from my cable to oil sump, but I consider
that to be my fault..it's a close fit and I did nothing
to protect the cable. It was just some sheathing wear,
nothing that went into the metal shell. But, when
I did the reinstall I added a 2" section of rubber
hose over the cable, RTV'd in place, and also did
a better job on the clamps. Will be hitting 900
hours this weekend.

Tim Olson - RV-10 N104CD
do not archive
On 10/18/2012 8:27 PM, Seano wrote:
[quote]

I have a wide deck and stock cables. They work good and were plenty long. 270 hours.

Sent from my iPhone

On Oct 18, 2012, at 19:05, "Pascal" <rv10flyer(at)live.com> wrote:

>
>
> You may be on to something, I have a narrow deck, which might explain why I never had an issue with either the prop nor the throttle cables. I happen to have checked both last week as I go through my condition inspection and they looked fine, the rubber donuts look a little cracked up however but the cables look fine.
> --


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