O-200 Engine STC SA547EA

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O-200 Engine STC SA547EA

Postby Randy Thompson » Sun Jul 24, 2005 1:34 pm

I have just received my amended paperwork for putting an O-200 engine in a Cessna 120, 140 or 140A. The Sensenich 69CK is now listed as one of three propeller types along with the previously listed McCauley 1A100 and 1A101 propellers.
A&P IA. Holder of STC for O-200A's in 120, 140 & 140A's. Engine overhauls on C-85's ,C-85's with O-200 crankshaft, C-90's and O-200A's
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Re: O-200 Engine STC SA547EA

Postby Tye Hammerle » Sun Jul 24, 2005 5:34 pm

Randy L. Thompson wrote:I have just received my amended paperwork for putting an O-200 engine in a Cessna 120, 140 or 140A. The Sensenich 69CK is now listed as one of three propeller types along with the previously listed McCauley 1A100 and 1A101 propellers.


Congratulations Randy. For the junior birdman, what does having the Sensenich on the list mean? :) Are there any performance advantages to the Sensinich or is it about providing more options, better availability, pricing?
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Re: O-200 Engine STC SA547EA

Postby Randy Thompson » Sun Jul 24, 2005 5:42 pm

Thanks.
My purpose is to give more choices at reasonable cost. The Sensenich is a good propeller. When people buy an O-200 from a 150 it may be the prop that was on that airplane, too. Before I added it one would need to find a McCauley to adhere to the STC.
Now that this is accomplished I will work on the Aeromatic as another choice. It is already allowed for C-85's.
A&P IA. Holder of STC for O-200A's in 120, 140 & 140A's. Engine overhauls on C-85's ,C-85's with O-200 crankshaft, C-90's and O-200A's
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Re: O-200 Engine STC SA547EA

Postby Tye Hammerle » Sun Jul 24, 2005 5:48 pm

Randy L. Thompson wrote:Thanks.
My purpose is to give more choices at reasonable cost. The Sensenich is a good propeller. When people buy an O-200 from a 150 it may be the prop that was on that airplane, too. Before I added it one would need to find a McCauley to adhere to the STC.
Now that this is accomplished I will work on the Aeromatic as another choice. It is already allowed for C-85's.


Sounds very good. Did you see the latest news that the Aeromatic fellow got his FAA approval to manufacture new ones? The Aeromatic seems like it would give the best of both worlds, better climb and cruise. Depends though on how radically daily changes in air conditions affect its "tune" based on what the fellow posting here had said.
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Re: O-200 Engine STC SA547EA

Postby N1940V » Sun Jul 24, 2005 9:26 pm

Tye Hammerle wrote: what does having the Sensenich on the list mean?


Get out your Spruce catalog and look at the HUGE difference in price between new Sensenich and Macauley props.

Great job, Randy!

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Re: O-200 Engine STC SA547EA

Postby Randy Thompson » Sun Jul 24, 2005 10:36 pm

Thanks! It gets even better. I raised the static RPM limitations on the McCauleys so you can get a little more horsepower.
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Re: O-200 Engine STC SA547EA

Postby Tye Hammerle » Mon Jul 25, 2005 11:29 pm

Randy L. Thompson wrote:Thanks! It gets even better. I raised the static RPM limitations on the McCauleys so you can get a little more horsepower.


Randy, how do you handle updates to the STC? Will you send one out or should we request it or ? I'm guessing that to setup for the higher rpm's we'd have to have the paperwork for our friendly feds should they come callin.

Speaking of Feds, sunday I met the guy in the Tee next to me. He is a 39 year retired MKE FSDO fed with a really cherry 152. Seemed like a good guy.
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Re: O-200 Engine STC SA547EA

Postby Randy Thompson » Tue Jul 26, 2005 6:48 pm

Just letting people know that I have made amendments. Of course, anyone that gets the STC from now forward will get it with the new paperwork.
For those that have the STC or are considering it, the limitations are as follows:

McCauley 1A100 Static RPM 2200-2475 RPM
McCauley 1A101 Static RPM 2200-2600 RPM
Sensenich 69CK Static RPM 2320-2470 RPM

This allows a flatter pitch prop especially with the 1A101 McCauley.
A&P IA. Holder of STC for O-200A's in 120, 140 & 140A's. Engine overhauls on C-85's ,C-85's with O-200 crankshaft, C-90's and O-200A's
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Re: O-200 Engine STC SA547EA

Postby martint » Mon Mar 02, 2009 10:26 am

Randy Thompson wrote:For those that have the STC or are considering it, the limitations are as follows:

McCauley 1A101 Static RPM 2200-2600 RPM

This allows a flatter pitch prop especially with the 1A101 McCauley.


Randy, I have your STC, and as you suggested to me on another thread, if I flatter my 1A101 near 46 or 48 I'll be towards 2600rpm static, instead of 2400 that I have now with 52 pitch.

Question I have: If I still have the older cylinders that do 24degre BTDC (as per the technical article). Would that have an influence/restrict on trying to flatter the pitch to get 2600?
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Postby Randy Thompson » Mon Mar 02, 2009 12:29 pm

Engines timed to 24 degrees +/- 1 degree will still turn a static of near 2600 RPM with a 6948 McCauley 1A101 propeller. You will see an incredable performance change with four inches less pitch.
A&P IA. Holder of STC for O-200A's in 120, 140 & 140A's. Engine overhauls on C-85's ,C-85's with O-200 crankshaft, C-90's and O-200A's
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Postby martint » Mon Mar 02, 2009 7:08 pm

Thxs Randy for the response. 8)
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Postby Michel Charette » Tue Mar 03, 2009 10:01 am

Hey Martin,

You getting quite technical these days ! Preparing for ski flying and performance take-offs ?
MichelC (ex-caretaker of C-GNCJ)
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Postby martyh » Thu Mar 18, 2010 3:15 pm

Is there any compelling reason to change from a C-90-12F to the O-200a? I have a 71 X 52 Met-L prop on my 120.
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Postby martint » Sat May 26, 2012 11:24 pm

Randy Thompson wrote:Engines timed to 24 degrees +/- 1 degree will still turn a static of near 2600 RPM with a 6948 McCauley 1A101 propeller. You will see an incredable performance change with four inches less pitch.


Thought I would revive that thread to give my experience.
After 25 hrs on the Top OH we did in fall with 4 new Millenium, I just had my 1A101 repitched.
The propeller tech log was saying that the last time it was pitched was in 1988 at 69-54. Wonder why I couldn't get higher than 2550 max rpm in level flight.
My static was around 2375-2400rpm.
It is now at 69-48. It is simply amazing :shock: 8) :banana

I get almost 2600rpm static and max rpm level flight I'm just about redline @ 2750rpm
But the take-off and climb rate are simply WooooW! At sea level , 78F, climb at 80mph I got over 1200fpm. (still have more tests to perform)

I can now cruise at 2500 to 2550rpm which the engine seem to prefer (used to be at 2400 to 2450), but the best is that I can pull out way more HP from my O200A and will be able to get out from tighther spots or won't be afraid to clear the trees on warm days.

Thxs Randy for sharing your knowledge with us.

Martin (FJAR) :wink:
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Postby martyh » Sun May 27, 2012 4:43 pm

1200fpm on 100hp? Are you sure about that? What is your cruise speed now?
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Postby Randy Thompson » Sun May 27, 2012 4:58 pm

The conversion is within a couple of lbs if you use an alternator. 18% more power and the same weight works wonders. When the STC was first granted the 69-54 prop was used for testing. It performed just a bit better than a C-85 because the HP increase was minimal. With the prop pitched down the engine will produce close to its rated 100 Horse Power.
A&P IA. Holder of STC for O-200A's in 120, 140 & 140A's. Engine overhauls on C-85's ,C-85's with O-200 crankshaft, C-90's and O-200A's
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Postby martyh » Sun May 27, 2012 9:31 pm

Is there a power increase available for the C-90? My C-90 is solid and low time but it never hurts to plan ahead and I would love more rate of climb. The 69-54 prop comes off a ???
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Postby martint » Sun May 27, 2012 9:48 pm

martyh wrote:1200fpm on 100hp? Are you sure about that? What is your cruise speed now?


As I said I will have to go do more flights.
But yes this is what I got 80mph climb and over 1200fpm at 78F

My cruise speed is a bit slower than before (used to be on the limit of green arc), now I think it is just slightly below 110mph IA, but again will recheck everything in next series of flights.

Anyway, I'm not planning to retest everything that was done with the O200A STC. Just wanted to express how happy I am with the new performance numbers I saw.
Cheers!
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