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1. 02:56 AM - Re: Re: 447 analysis (rparigor@suffolk.lib.ny.us)
2. 06:40 AM - Re: 447 analysis (lucien)
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| Subject: | Re: 447 analysis |
Hi Rick
"Do you still fly the balloon? That
articleyou sent me was a hit with my EAA chapter."
I
haven't in several years. building a Europa XS, but will drag it out when
I am flying the XS.
BTW I needed to cut and paste back together the
expansion chamber to get it to fit the "Screwball" frame which
changed things a little and also installed a sock air filter that changed
things a lot. That engine is 73cc and puts out 22HP. After some fiddeling
the thing runs great!
Ron Parigoris
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| Subject: | Re: 447 analysis |
undoctor wrote:
> Thanks to both of you for your contributions, Lucien and Rick. I've
> messed with the load factor and there are times I can get it to pull
> steady at 48 - 5000, but I seem to be descending (just ordered a digital
> Attitude Indicator which will make it easier than using the VSI) It's
> encouraging to know that this part of my question seems to be the
> "nature of the beast." The 50% tan 50% black spark plug has me a bit
> more concerned, though.
>
>
You probably won't ever be able to get the mixture exactly the same on both cyls
when running the single carb. Like I said, the 503 has the same problem when
run single-carb, tho to a lesser degree. So it's not really just a problem with
the 447.
So the best you can do is identify the lean cylinder and ensure that that one always
runs sufficiently rich. Generally, tho, when jetted according to Rotax specs,
you're practically always where you need to be with that. So if you find
that you have to jet a long ways from the recommended settings for your altitude
and temp, then you know you have a problem.
Rick is right tho that the load on the motor is the main treatment. Particularly
if you're underpropped the engine will really wander around in that midrange
throttle setting, is what I found.
Finally, and not meaning to be contrary, 6000 rpm all the time is really too much.
The 2-strokes, especially the 582, aren't like the 912 series which can be
run at max power pretty much all the time. They're 2-stroke engines and they
work harder than the 4-stroke 912's do. The 447 is generally more forgiving of
this than the other two, but for the longest life I'd personally limit the max
rpm on a continuous basis to about 5600; 5400 is the "sweet spot" for the 447/503.
6000+ all the time will knock a bit off your TBO as well as use a lot
more gas than you really need to burn.
LS
--------
LS
Titan II SS
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