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throttle setup

 
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taildrags



Joined: 29 Dec 2009
Posts: 1655
Location: Medford, OR

PostPosted: Sun Nov 24, 2019 11:39 am    Post subject: throttle setup Reply with quote

G'day, Pietenpolers;

In an effort to get a Piet thread bumped to the top of the topics list instead of the annual list support threads (I already made my annual contribution to Matronics, thank you Matt), I'm throwing out a general question about throttle setups. I don't like the setup on my airplane and am going to start from scratch. To describe what I have, it's a Bowden cable running from the rear cockpit to the carb. In the front cockpit, a wooden sewing thread bobbin with the edges rounded off has been slipped over the center wire with bug nuts clamping each side of it to the center wire to let the front cockpit occupant slide it back and forth to work the throttle. The setup looks pretty cheesy, but since it's tucked in pretty tight under the top edge of the cockpit, I've never had a passenger snag it or bump it while getting in or out. Other than that, not much else good about it.

In the rear cockpit, a simple flat aluminum lever with the pivot point at the bottom and a round knob up near the top coaming works the throttle. It's pretty cheesy too, but what I like is that I can rest my left hand on the coaming and use my fingertips to work the throttle. It's very stable and easy to make small changes in engine power that way, especially on a bumpy afternoon. Since the knob is up near the coaming rather than down further, I can also reach in and work the throttle very easily from outside the cockpit while prop-starting. It also has enough friction and drag in the cables and lever where I can set throttle in cruise and rarely have it back off or creep off of the RPM that I want.

So what I'm looking for are pix or ideas on how you set up your throttle(s). I've looked through some of the setups in Westcoastpiet. I've already decided to link the front and rear throttles with a rod rather than with the Bowden cable, but other than that, I'm open to ideas. The builder routed the throttle cable inside the cockpit, not outside between the plywood and fabric, so I can get to all of it if I choose to. Thanks.

Oscar Zuniga
Medford, OR


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Oscar Zuniga
Medford, OR
Air Camper NX41CC "Scout"
A75 power, 72x36 Culver prop
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oldbird



Joined: 23 Apr 2015
Posts: 106

PostPosted: Mon Nov 25, 2019 6:11 am    Post subject: throttle setup Reply with quote

Hi Oscar
I made my throttle levers as in the picture. Front and rear are identical, connected with solid rod. A bowden cable, actually marine throttle or gearshift linkage, runs from the rear lever to the carb, inside wall of the cockpits. The size of the bowden is the same as the piper's, but since it is marine, it is all in stainless steel.
Cheers
Semih Oksay, Istanbul, Turkey (Now in Orlando,Fl)
On Sun, Nov 24, 2019 at 2:42 PM taildrags <taildrags(at)hotmail.com (taildrags(at)hotmail.com)> wrote:

Quote:
--> Pietenpol-List message posted by: "taildrags" <taildrags(at)hotmail.com (taildrags(at)hotmail.com)>

G'day, Pietenpolers;

In an effort to get a Piet thread bumped to the top of the topics list instead of the annual list support threads (I already made my annual contribution to Matronics, thank you Matt), I'm throwing out a general question about throttle setups.  I don't like the setup on my airplane and am going to start from scratch.  To describe what I have, it's a Bowden cable running from the rear cockpit to the carb.  In the front cockpit, a wooden sewing thread bobbin with the edges rounded off has been slipped over the center wire with bug nuts clamping each side of it to the center wire to let the front cockpit occupant slide it back and forth to work the throttle.  The setup looks pretty cheesy, but since it's tucked in pretty tight under the top edge of the cockpit, I've never had a passenger snag it or bump it while getting in or out.  Other than that, not much else good about it.

In the rear cockpit, a simple flat aluminum lever with the pivot point at the bottom and a round knob up near the top coaming works the throttle.  It's pretty cheesy too, but what I like is that I can rest my left hand on the coaming and use my fingertips to work the throttle.  It's very stable and easy to make small changes in engine power that way, especially on a bumpy afternoon.  Since the knob is up near the coaming rather than down further, I can also reach in and work the throttle very easily from outside the cockpit while prop-starting.  It also has enough friction and drag in the cables and lever where I can set throttle in cruise and rarely have it back off or creep off of the RPM that I want.

So what I'm looking for are pix or ideas on how you set up your throttle(s).  I've looked through some of the setups in Westcoastpiet.  I've already decided to link the front and rear throttles with a rod rather than with the Bowden cable, but other than that, I'm open to ideas.  The builder routed the throttle cable inside the cockpit, not outside between the plywood and fabric, so I can get to all of it if I choose to.  Thanks.

Oscar Zuniga
Medford, OR

--------
Oscar Zuniga
Medford, OR
Air Camper NX41CC &quot;Scout&quot;
A75 power, 72x36 Culver prop




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Semih Oksay


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tsts4



Joined: 06 Aug 2007
Posts: 160
Location: Tampa, FL

PostPosted: Mon Nov 25, 2019 11:14 am    Post subject: Re: throttle setup Reply with quote

Semih, was there a particular reason you ran your Bowden cable from the rear throttle lever instead of the front lever?

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Todd Stovall
aka "Auburntsts" on EAA and VAF
RV-10 N728TT -- Flying
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tkreiner



Joined: 06 Aug 2009
Posts: 188
Location: Spring, TX

PostPosted: Sat Nov 30, 2019 6:15 pm    Post subject: Re: throttle setup Reply with quote

Oscar,

Like you, I’m planning on a rod linking the front and rear throttle handles together, with a Bowden cable to the carb.

Speaking of Bowden cables, I made a nice find that I’d like to share with all. I came across a Bernard MIG Liner, thru which MIG welding wire is fed by the welder.

I picked up a 15’ long liner locally for $10. Not bad considering that ACS is getting over $2.00 per foot. This is a Bowden cable that accepts 1/16 SS wire, rather than the .078 wire. Maybe the best part about it is that it is roughly half the weight of the ACS cable.

This Bowden cable will accept either 1/16 (.062) or 1.5mm SS wire. After an exhaustive search, I found 1.5mm SS half hard wire on eBay for roughly $6.75 for 5 meters.

I’m planning to use this for throttle, mixture, and carb heat.


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Tom Kreiner
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taildrags



Joined: 29 Dec 2009
Posts: 1655
Location: Medford, OR

PostPosted: Sat Nov 30, 2019 8:05 pm    Post subject: Re: throttle setup Reply with quote

Tom; thanks. I'll look into that MIG liner. For the wire, my starting point is always McMaster-Carr. A quick search on their site finds a 27 ft length of .059" (about 1.5mm) "spring back" 304 stainless wire for $5.03, but they have lots of others to choose from. I think for the throttle I'd go heavier than more slender just to avoid the possibility of kinking the wire on a quick full throttle advance.

-Oscar


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Oscar Zuniga
Medford, OR
Air Camper NX41CC "Scout"
A75 power, 72x36 Culver prop
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gjkaal



Joined: 22 Jan 2015
Posts: 14

PostPosted: Mon Dec 02, 2019 12:11 pm    Post subject: throttle setup Reply with quote

Nice! Once you know, what you're looking for, things get simpler. Never thought about searching for MIG Liner:
https://nl.aliexpress.com/item/32719611456.html?spm=a2g0z.12010612.8148356.23.7f4b4ac0uqMDw2
Ordered 2 sets of 4m (12ft) for €12,50 ...

On Sun, 1 Dec 2019 at 03:19, tkreiner <tkreiner(at)gmail.com (tkreiner(at)gmail.com)> wrote:

Quote:
--> Pietenpol-List message posted by: "tkreiner" <tkreiner(at)gmail.com (tkreiner(at)gmail.com)>

Oscar,

Like you, I’m planning on a rod linking the front and rear throttle handles together, with a Bowden cable to the carb.

Speaking of Bowden cables, I  made a nice find that I’d like to share with all.  I came across a Bernard MIG Liner, thru which MIG welding wire is fed by the welder.

I picked up a 15’ long liner locally for $10.  Not bad considering that ACS is getting over $2.00 per foot.  This is a Bowden cable that accepts 1/16 SS wire, rather than the .078 wire.  Maybe the best part about it is that it is roughly half the weight of the ACS cable.

This Bowden cable will accept either 1/16 (.062) or 1.5mm SS wire.  After an exhaustive search, I found 1.5mm SS half hard wire on eBay for roughly $6.75 for 5 meters. 

I’m planning to use this for throttle, mixture, and carb heat.

--------
Tom Kreiner




Read this topic online here:

http://forums.matronics.com/viewtopic.php?p=493692#493692






===========
br> fts!)
r> > rel="noreferrer" target="_blank">http://www.matronics.com/contribution
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===========
br> enpol-List" rel="noreferrer" target="_blank">http://www.matronics.com/Navigator?Pietenpol-List
===========
FORUMS -
eferrer" target="_blank">http://forums.matronics.com
===========
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errer" target="_blank">http://wiki.matronics.com
===========
b Site -
          -Matt Dralle, List Admin.
rel="noreferrer" target="_blank">http://www.matronics.com/contribution
===========





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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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GJH Kaal
Building a Pietenpol air camper
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oldbird



Joined: 23 Apr 2015
Posts: 106

PostPosted: Mon Dec 02, 2019 4:25 pm    Post subject: throttle setup Reply with quote

I have played with MIG for 25 years and never thought of using the liner as throttle cable. The marine throttle cables for especially outboard motors are the same dimension with the Piper throttle cables, almost any length. More durable and reliable I think. Their ends are just the same as Piper throttle cables.
my 2 cents
Semih Oksay, building in Istanbul, Turkey, now in Orlando,Fl
On Mon, Dec 2, 2019 at 3:18 PM Gerrit-Jan Kaal <gjhkaal(at)gmail.com (gjhkaal(at)gmail.com)> wrote:

Quote:
Nice! Once you know, what you're looking for, things get simpler. Never thought about searching for MIG Liner:
https://nl.aliexpress.com/item/32719611456.html?spm=a2g0z.12010612.8148356.23.7f4b4ac0uqMDw2
Ordered 2 sets of 4m (12ft) for €12,50 ...

On Sun, 1 Dec 2019 at 03:19, tkreiner <tkreiner(at)gmail.com (tkreiner(at)gmail.com)> wrote:

Quote:
--> Pietenpol-List message posted by: "tkreiner" <tkreiner(at)gmail.com (tkreiner(at)gmail.com)>

Oscar,

Like you, I’m planning on a rod linking the front and rear throttle handles together, with a Bowden cable to the carb.

Speaking of Bowden cables, I  made a nice find that I’d like to share with all.  I came across a Bernard MIG Liner, thru which MIG welding wire is fed by the welder.

I picked up a 15’ long liner locally for $10.  Not bad considering that ACS is getting over $2.00 per foot.  This is a Bowden cable that accepts 1/16 SS wire, rather than the .078 wire.  Maybe the best part about it is that it is roughly half the weight of the ACS cable.

This Bowden cable will accept either 1/16 (.062) or 1.5mm SS wire.  After an exhaustive search, I found 1.5mm SS half hard wire on eBay for roughly $6.75 for 5 meters. 

I’m planning to use this for throttle, mixture, and carb heat.

--------
Tom Kreiner




Read this topic online here:

http://forums.matronics.com/viewtopic.php?p=493692#493692






===========
br> fts!)
r> > rel="noreferrer" target="_blank">http://www.matronics.com/contribution
          -Matt Dralle, List Admin.
===========
br> enpol-List" rel="noreferrer" target="_blank">http://www.matronics.com/Navigator?Pietenpol-List
===========
FORUMS -
eferrer" target="_blank">http://forums.matronics.com
===========
WIKI -
errer" target="_blank">http://wiki.matronics.com
===========
b Site -
          -Matt Dralle, List Admin.
rel="noreferrer" target="_blank">http://www.matronics.com/contribution
===========





--
Semih Oksay


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