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Static RPM

 
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Mike Gleason



Joined: 10 Jan 2006
Posts: 4
Location: Welch, MN
PostPosted: Sat Oct 28, 2006 6:29 am    Post subject: Static RPM Reply with quote
Listers
I have a 912UL 80hp with a 68" Warp Drive. Pitch is set at 9 degrees at the
tip as prescribed. Based on what Warp Drive has told me and what I can
discern from the archives I should be seeing 5200 to 5400 static rpm. I am
getting just over 5000rpm and I have verified the tach.

I was wondering what you guys running the same engine, prop combination
were seeing for static rpm and at what pitch?

Mike
701 ready to fly

do not archive

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planejim(at)bellsouth.net
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PostPosted: Sat Oct 28, 2006 7:57 am    Post subject: Static RPM Reply with quote
Mike and Kerin,

I have a Rotax 912UL 80HP on my 601HD but have a GSC prop. I have it set at
16 degrees, but it at 2/3 of the way out the blade so we're not comparing
apples to apples, however the RPM thing should be close to the same because
you want to be able to develope full power/ RPM on take-off. I have found
that the cooler weather also affects the whole balance with this.

I was advised in the beginning ( 10 years ago ) to make sure I got 5100 RPM
static so that I could get about 5500 on climb out and would not exceed 5800
RPM max throttle in level flight. I did that ( it was in the cool time of
the year - in Georgia - about 40 to 50 degrees F ) and it worked out fine.

I've installed a new set of blades on my prop and have found that at the
same angle ( 16 degrees - GSC Prop ) now only gets me 4900 RPM static but
the RPM gets to 5500 RPM at cruise climb at full throttle. I haven't checked
it yet to see if it exceed 5800 RPM max throttle in level flight. I doubt it
since I'm getting less static RPM. Since I currently fly out of an airport
with 5000 ft runway the low RPM is not a problem, however if I were to go
into a short field and try to get out with a heavy losd on a hot day it may
be a problem developing full power. I will change the prop angle ( reduce
it ) so that I can get 5100 RPM static again.

If you are going to fly your test flight out of a long runway airport the
5000 RPM you,re getting would be OK, especially on a 701. At least you
probably won't overspeed your engine. I'm concerned that if you get 5400 RPM
static, that you may have an overspeed situation at full throttle in level
flight.

That's about all I can think of about it, Good luck with your 701.

Jim Hoak 601 HD - Rotax 912 UL - 532 Hours.

---

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larry(at)macsmachine.com
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PostPosted: Sat Oct 28, 2006 9:33 am    Post subject: Static RPM Reply with quote
Mike,
I'm not familiar with the low limits of pitch settings for the 701 so
equipped, but 9-degrees seems a bit low. Before
test flying your bird, get with Zenith and ask them what is the optimum
middle ground set.

Larry McFarland
Do not archive

Mike & Kerin Gleason wrote:

Quote:

<gleasons(at)visi.com>

Listers
I have a 912UL 80hp with a 68" Warp Drive. Pitch is set at 9 degrees
at the tip as prescribed. Based on what Warp Drive has told me and
what I can discern from the archives I should be seeing 5200 to 5400
static rpm. I am getting just over 5000rpm and I have verified the tach.

I was wondering what you guys running the same engine, prop
combination were seeing for static rpm and at what pitch?

Mike
701 ready to fly

do not archive


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cgbrt(at)mondenet.com
Guest
PostPosted: Sun Oct 29, 2006 5:18 am    Post subject: Static RPM Reply with quote
Mike
4900 to 5100 is about what I get depending on conditions.
Carl
701/912

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