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Rotax 912UL/Woodcomp 3 Blade, Klassic 160 (63")

 
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hgmckay



Joined: 23 May 2006
Posts: 397

PostPosted: Tue Oct 24, 2006 3:45 pm    Post subject: Rotax 912UL/Woodcomp 3 Blade, Klassic 160 (63") Reply with quote

Gentlemen:
<![if !supportEmptyParas]> <![endif]>
I am getting all types of input concerning setting the prop pitch for my Allegro 2000, which has a 912 UL engine and a Woodcomp, 3 blade, Klassic 160 (63”) prop. I have gotten recommendations everywhere from 14° to 20°. This is quite a variation for prop pitch. I have tested the engine (Static Test) for two pitch settings and the rpm results as indicated by the engine tach are as follows:
<![if !supportEmptyParas]> <![endif]>
17.5° Pitch = 4600 engine rpm = 65 engine hp* = 40 propeller hp*
<![if !supportEmptyParas]> <![endif]>
16.5° Pitch = 4900 engine rpm = 70 engine hp* = 47.5 propeller hp*
<![if !supportEmptyParas]> <![endif]>
  • *see graph on page 10-3 of the Rotax Operator’s Manual

<![if !supportEmptyParas]> <![endif]>
These numbers don’t appear to reflect an efficient use of engine horsepower to prop horsepower. Seems to me that the higher the static rpm (up to 5800 rpm) the more efficient use of the engine/propeller combination. Therefore, one would think that setting the Prop pitch to obtain a static max rpm of 5700 rpm would be the best choice. To do this the pitch would have to be reduced below 16.5° (in my case). It is interesting to note that the tech at Fantasy Air USA (Distributor for the Allegro) tells me they set all of their props at 14° pitch. I am going to reduce my pitch to 14.5° and conduct another static test to see what rpm I get on the engine at max throttle. Any comments or suggestions concerning this?
<![if !supportEmptyParas]> <![endif]>
Hugh McKay
Allegro 2000
912UL
N661WW
<![if !supportEmptyParas]> <![endif]>
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daveaustin2(at)can.rogers
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PostPosted: Tue Oct 24, 2006 3:55 pm    Post subject: Rotax 912UL/Woodcomp 3 Blade, Klassic 160 (63") Reply with quote

Hugh,
I'd recommend you set the prop to get 5000 rpm static. With that you will find that you still have to keep an eye on the rev counter as you climb out so as not to exceed the 5800.
IMHO that is a good setting to start. You will probably want to coursen up a couple of degrees to get good cruise later.
Dave Austin 601HDS - 912, Spitfire Mk VIII
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propellerdesign(at)tele2.
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PostPosted: Wed Oct 25, 2006 5:44 am    Post subject: Rotax 912UL/Woodcomp 3 Blade, Klassic 160 (63") Reply with quote

Hi

You are supposed to climb at Vy with WOT without over revving.

Best speed is achieved if you prop it for 5800 at WOT horizontal flight, at your normal cruising alt.

Some over-reeve for better climb.

or to 5500 at 7500´ WOT for max cruise.

Jan Carlsson
www.jcpropellerdesign.com

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dave(at)dreamwings.co.za
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PostPosted: Thu Oct 26, 2006 6:14 am    Post subject: Rotax 912UL/Woodcomp 3 Blade, Klassic 160 (63") Reply with quote

Hugh,

My Allegro has the 80hp 912 and I've set my prop for 5000rpm static. The
prop is a KievProp 263. If you set up for 5700 static, you will definately
get great takeoff and climb performance because as you will be getting
almost max hp out of the engine. But in cruise you will have to throttle
back a long way to get reasonable cruise rpm and your cruise speed will
suffer. With the 80hp engine and my 5000rpm static setting, she still
climbs well and then gives me around 100mph at 5000rpm cruise. If you are
concerned about takeoff performance on your fist flight, set her up for 5200
static. I'm sure after a few flights you will find yourself making it a bit
courser. I would not set it for 5700 static, especially for the first
flight. There is high enough work load on a test flight without having to
worry about over revving the engine as well.

Regards
Dave
Durban, South Africa

Quote:
From: "Hugh McKay III" <hgmckay(at)bellsouth.net>
Subject: Rotax 912UL/Woodcomp 3 Blade, Klassic 160
(63")

Gentlemen:

I am getting all types of input concerning setting the prop pitch for my
Allegro 2000, which has a 912 UL engine and a Woodcomp, 3 blade, Klassic
160
(63) prop. I have gotten recommendations everywhere from 14 to 20. This
is quite a variation for prop pitch. I have tested the engine (Static
Test)
for two pitch settings and the rpm results as indicated by the engine tach
are as follows:

17.5 Pitch = 4600 engine rpm = 65 engine hp* = 40 propeller hp*

16.5 Pitch = 4900 engine rpm = 70 engine hp* = 47.5 propeller hp*

* *see graph on page 10-3 of the Rotax Operators Manual

These numbers dont appear to reflect an efficient use of engine horsepower
to prop horsepower. Seems to me that the higher the static rpm (up to 5800
rpm) the more efficient use of the engine/propeller combination.
Therefore,
one would think that setting the Prop pitch to obtain a static max rpm of
5700 rpm would be the best choice. To do this the pitch would have to be
reduced below 16.5 (in my case). It is interesting to note that the tech
at
Fantasy Air USA (Distributor for the Allegro) tells me they set all of
their
props at 14 pitch. I am going to reduce my pitch to 14.5 and conduct
another static test to see what rpm I get on the engine at max throttle.
Any
comments or suggestions concerning this?

Hugh McKay
Allegro 2000
912UL
N661WW



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