Today's Message Index:
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1. 09:31 AM - Static RPM Oddity (?) (John Fasching)
2. 01:56 PM - Re: Static RPM Oddity (?) (Roger Lee)
Message 1
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| Subject: | Static RPM Oddity (?) |
I just reinstalled the hub "clamp" for my Sensenich composite ground
adjustable prop on my RV-12 that had been "recalled" to machine it so it
clamped the blades tighter (there were some reports of blade angle
changing because they were not clamped enough).
I was setting the blades to achieve about 5,000 static RPM when I
noticed something that is not entirely clear to me: The 'speed' or haste
used to go to full throttle affected the static rpm that was achieved. A
rather good shove produced more top rpm than a slow methodical
application of full throttle.
I ended up doing ten 'runs' and averaging them to get the 5,010 rpm that
I settled for on the Rotax 921ULS in the plane.
I'm happy but not certain why the variabtion; my guess is that it has
something to do with the fuel fed to the carbs, or into the combustion
chambers.
JohnF
Message 2
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| Subject: | Re: Static RPM Oddity (?) |
Most likely a throttle cable and or a throttle lever adjustment. Evidently something
can stretch or even be pulled so much as to make a little 2-4mm change and
that's all it would take. My guess is the change is so small you can't feel
it, but does affect the carb.
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Roger Lee
Tucson, Az.
Light Sport Repairman - Maintenance Rated
Rotax Repair Center
Home 520-574-1080 TRY HOME FIRST
Cell 520-349-7056
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