Today's Message Index:
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1. 11:11 AM - Re: aileron to wing gap seal (Ducati SS)
2. 11:35 AM - Re: Bing 54 (Ducati SS)
3. 11:43 AM - Re: Bing 54 (Ducati SS)
4. 01:49 PM - Re: Re: Bing 54 (Stuart Harner)
Message 1
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| Subject: | Re: aileron to wing gap seal |
????? Considering all the work which was sometimes stressful, such as rigging the
wings and tail as I built my Firefly, the gap seal was fairly straight forward
and easy. why not just do it as the plans outline? Straight forward and easy.
The only drawback I have encountered and it could be significant in the absence
of a proper preflight is that the full span gap seals can collect debris.
But full span piano hinges would have the same drawback.
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=509956#509956
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First a description of how an en
richer works and then what I fear is a functional drawback when applied to our
aircraft.
A true choke mechanically restricts air flow into the venturi. This method is somewhat
tolerant of various throttle settings.
The enricher is a completely independent circuit which relies on high vacuum ahead
of the slide to pull fuel up from the float bowl where it exits ahead of the
slide. It takes a very small rise of the slide to destroy the necessary vacuum
and defeat the enricher circuit. I ran into this repeatedly as a motorcycle
snowmobile mechanic. Customer would state that their new machine was wonderful
with the exception that it would not start cold. I would say lets go give it
a try, as I watched they would inadvertently open the throttle just by the smallest
amount, this resulted in a no start. I would then tell them to take their
hand completely away from the throttle and use one finger to push the starter
button, instant start. Sooo my concern with these engines pressed into service
as aircraft power plants is that we need to run a fairly high slide position
to eliminate gearbox chatter. I really doubt the universal effectiveness
of enrichers, Like many snowmobiles I installed a pump type primer on my Firefly
and disabled the enricher. Very effective and easy starts. Just position the
primer within easy reach as it will require an additional pump or three as
the engine warms.
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=509957#509957
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I should add that anyone using a psru with a clutch could probably use an enricher.
For the remainder of us we have a prop load as soon as the engine starts
which requires the higher slide position. Sadly it is almost universal to mislabel
an enricher as the choke which it surly is not.
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=509958#509958
Message 4
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An enricher is definitely not a choke even when Bing labels the lever
with the word "Choke" on it. A misnomer for sure.
However, I don't quite understand when you said the enricher does not
work unless the throttle is closed.
I have used the enricher to keep the EGT down during partial power
descents. Unloading the engine by reducing power during descent often
causes my EGT warning to go off. I pull a little enricher to keep it
from running so lean and it cools back down. This seems to indicate that
at least some fuel is being drawn in with the slide at about half throttle.
Of course starting and half throttle are two completely different things
and may not effect the enricher in the same way.
Stuart
On 1/16/23 13:35, Ducati SS wrote:
>
> First a description of how an en
> richer works and then what I fear is a functional drawback when applied to our
aircraft.
> A true choke mechanically restricts air flow into the venturi. This method is
somewhat tolerant of various throttle settings.
> The enricher is a completely independent circuit which relies on high vacuum
ahead of the slide to pull fuel up from the float bowl where it exits ahead of
the slide. It takes a very small rise of the slide to destroy the necessary vacuum
and defeat the enricher circuit. I ran into this repeatedly as a motorcycle
snowmobile mechanic. Customer would state that their new machine was wonderful
with the exception that it would not start cold. I would say lets go give
it a try, as I watched they would inadvertently open the throttle just by the
smallest amount, this resulted in a no start. I would then tell them to take
their hand completely away from the throttle and use one finger to push the starter
button, instant start. Sooo my concern with these engines pressed into
service as aircraft power plants is that we need to run a fairly high slide position
to eliminate gearbox chatter. I really doubt the universal effectiveness
of enrichers, Like many snowmobiles I installed a p!
> ump type primer on my Firefly and disabled the enricher. Very effective and
easy starts. Just position the primer within easy reach as it will require an
additional pump or three as the engine warms.
>
>
> Read this topic online here:
>
> http://forums.matronics.com/viewtopic.php?p=509957#509957
>
>
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