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1. 08:16 AM - Re: carb (pietflyr)
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Or, if the bolt came loose before engine start and I had such a spring in
place, old John could have found himself in front of a prop going full
throttle, with nothing but my marginal brakes between him and being
shredded!
I think such a spring is a good idea, but I have so much friction in my
cable, I'm not sure it would help in my situation. Of course, if the bolt
came loose in flight at cruise or climb power, it wouldn't be much of a
problem. Only if I had throttled back to idle, then decided I needed more
power (often the case, considering the wondrous glide capabilities of a
Pietenpol) would it be a problem.
-----Original Message-----
From: owner-pietenpol-list-server@matronics.com
[mailto:owner-pietenpol-list-server@matronics.com]On Behalf Of Dick Navratil
Sent: Tuesday, June 06, 2006 8:52 PM
To: pietenpol-list@matronics.com
Subject: Re: Pietenpol-List: carb
Jack
I was hoping you would respond. I was thinking of your problem at
Brodhead when I posted. If you would have lost that bolt in flight maybe
even a lighter spring could have given you power to find a landing site???
If the bolt had departed as in your case on start up and the spring opened
the carb before start, the idler jets should be cut off and the engine
hopefully would not start.
Just a few thoughts
Dick
----- Original Message -----
From: Phillips, Jack
To: pietenpol-list@matronics.com
Sent: Tuesday, June 06, 2006 7:29 AM
Subject: RE: Pietenpol-List: carb
When I was at Brodhead last year, and preparing on Sunday to fly to the
other fly-in to the northeast, John Hoffmann gave me a prop and I pushed
the throttle forward to taxi to the runway. Nothing. The engine sat there
at idle. I shut it down and we investigated and found the bolt attaching
the throttle levers to the cable had come loose, so it can and will happen.
In my case, to prevent that occurance it would require a pretty heavy spring
at the carburetor.
Jack Phillips
NX899JP
-----Original Message-----
From: owner-pietenpol-list-server@matronics.com
[mailto:owner-pietenpol-list-server@matronics.com] On Behalf Of Barry Davis
Sent: Monday, June 05, 2006 1:14 PM
To: pietenpol-list@matronics.com
Subject: Re: Pietenpol-List: carb
I know quiet a few pilots that have the "spring" on their carbs. I
thought about it and came up with a few observations.
I think the cable would probably break when you PULL the throttle to
closed and put tension on the cable. I don't think it would make sense for a
cable to break by PUSHING it through the jacket. If it broke inside the
jacket, it seems that it would still push through, but might be harder than
normal due to frayed ends. This would leave the throttle on Open.
If the cable came off the carb lever by breakage or the bolt wearing
thru or falling out, then adding a very soft spring would be the best idea
in the world and you would be patting yourself on the back for a long time
after landing successfully.
If the spring is heavy, you will experience throttle creep and will
be constantly adjusting the throttle, it also puts a constant strain on the
cable. Look at the hardware stores or on the internet and look for a spring
with at least 1/2" diameter and very soft and pulls very easily. If the ends
are not long enough, an extender can be made from med to heavy safety tie
wire and anchored somewhere on the engine, not to the motor mount to isolate
constant vibration.
My 172 has one, but the 150 that I own with a partner does not. Go
figure. Our Piets are not flying yet. We just replaced the cable on the 150
and it had several thousand hours on it. It was not having a problem, but
replacement seemed like cheap insurance, especially if our kids take it out
for a spin.
If you ever feel a binding in the throttle, even just once, it is
time to take a look at that cable. By being a stranded cable, usually one or
two strands will break first and cause some friction. Consider this your
fair warning.
You need to have in mind a plan to cope with this type of emergency.
Either turn the engine switch on and off and blow the ends out of the
mufflers or get into a safe position at the airport, shut the engine down
and do a dead stick landing. Barry
----- Original Message -----
From: Dick Navratil
To: pietenpol-list@matronics.com
Sent: Sunday, June 04, 2006 12:03 AM
Subject: Pietenpol-List: carb
Has anyone installed a spring on the Stromberg carb to bring it to
full open in case of a linkage failure in flight? I went out flying today,
using a runway with no good emergency landing spots on the departure end.
Sitting around the hangar chatting later, that subject came up and it
sounded like a good idea.
Dick N.
Cardinal Health -- Working together. For life. (sm)
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