Propellor options for a Continental O-200 (2024)

I am preparing to float a Cessna 140A with a Continental O-200A 100hp. It is currently turning a metal 69x52 pitch prop.

I know some variants of the PA-11 came with a Cont. O-200 engine and, while the Cessna 140A wing design has nowhere near the performance of the Cub design, I thought someone here could provide useful advice.

I have read up on the issue at the Cessna 120/140 website, but I would like to hear from you guys, too.

So, would anyone like to share their opinions on what the best propellor options are for flatland Midwestern seaplane operations. My first choice would be for a lightweight, composite, electric-controlled, constant speed prop.

Any ideas?

Seaplane prop for the 0-200 cessna 150 is a 1A90CF/75x35 or 38.I have the 35 on my Legend.If you can get it approved it is is a great prop.Tiffinaire in Ohio has had the best price,ask for Mike Baird.This prop will turn 2550 static on a good stock 0-200 and about 2700 in a 60mph climb.It is the longest flattest certified prop for the 0-200.I can still cruise at 93mph@2550 burning alittle more than 5gph.

Bill

Longer is better? Thats what were told. Best performing shortest take off 0200 prop I ever drove was a Mac DCM 6948 C150 climb prop on my Pa11 that had been overhauled a few time and was only 67". 2675 rpm in a 45mph climb. I've been running longer props now but I miss that little stick.

Glenn

Glenn I bet that it was a lot less than 48 pitch to get that rpm unless it was a hopped up 0-200.

Jim that prop is approved on the Legend so I could buy it if someone wanted one.

Bill

Thanks for all the replies.

I am not sure if this is the correct way to ask, but does the O-200 have enough horsepower to quickly spool up a 74" x 48 prop? I need to get up fast, but I don't want to fly to my secret lake (into the northwest headwinds) with an effective groundspeed of 40-50 mph either.

Is an experimental Catto the only constant speed propeller option out there for an 0–200 or does MT or Hartzel make a composite adjustable pitch prop?

Paul I don't think a 0200 will turn a 7448 more then about 22 or 2300 rpm, thats less then 70 hp if I remember. An 0200 is just like a 2 stroke engine, it makes its HP with RPM.

Glenn

Paul with a 74/48 you won't even get off the water.As far as airspeed goes that 140 will probably top out around 90 on floats.The seaplane prop for a 140 with a c90 is the one Roger uses(74/40).That prop is not approved on the 0-200.There is no constant speed or controllable pitch prop currently in production for use on a certified 0-200 application.As I stated before my cub with the 75/35 will cruise at 93mph.

Bill

Roger Peterson said:

I use a 76AK2-40 on my 0-200. Tried 6 props and this one was the best.

Click to expand...

Roger---I agree--this prop makes the best combination for speed and RPM for my J-3 with a C90-8 (yah I still prop it at 80 yrs. old) ---it was a Sensenich 76" cut back to 74" therefore new designation 76AK-2-40----helps to keep the tips out of the snow and great climb performance----John F

Paul Heinrich said:

Thanks for all the replies.

I am not sure if this is the correct way to ask, but does the O-200 have enough horsepower to quickly spool up a 74" x 48 prop? I need to get up fast, but I don't want to fly to my secret lake (into the northwest headwinds) with an effective groundspeed of 40-50 mph either.

Click to expand...

"I need to get up fast" and "Cessna 140 on floats" do not go together. Particularly if the 140 is on the approved EDO 1650 floats.

Paul Heinrich said:

Is an experimental Catto the only constant speed propeller option out there for an 0–200 or does MT or Hartzel make a composite adjustable pitch prop?

Click to expand...

The Catto prop is fixed pitch not constant speed. You might check out a Aeromatic. http://www.aeromatic.com/

You can't throw C85 and C90 comparisons into the mix for what works on a 0200. Even though a C90 and 0200 share all the same parts except the most important one, the cam. The C 90 make a bunch of torque in the 2400 rpm range and a 0200 at the same rpm is lucky to be around 70 hp. If you want a 0200 to perform it needs to turn 2650 or better in a 50 mph climb
Brake Horsepower
Rated Maximum Continuous Operation..............................100 BHP @ 2750 RPM
Recommended Cruise.........................................................75 BHP @ 2500 RPM

Glenn

Ok, thanks for all the input.

I guess I will try for the 74x38 option first since the 74x40 isn't approved for the O-200.

Is there an STC for that prop on the Cessna 140 with an O-200, or do I have get a field approval to modify the O-200 engine STC I have to allow installation of that prop?

At sea level, 29" MP, and 2400 rpm
The C-85 produces about 173.7 lb-ft of torque (plotted in yellow)
The C-90 produces about 187.5 lb-ft (plotted in blue)
The O-200 produces about 193.1 lb-ft (plotted in red)
This is ignoring the bad (low) data point for the C-90 at 2350 rpm and 29" in the Continental data set.

At 2750 rpm, the C-90 will produce more power than the O-200 when the manifold pressure drops below 21 inches.

For an O-200 longwing J3 landplane, I would run a 7440. 7448 is way too much pitch for the O-200 on a J3 and will choke it down.
JimC

Welcome back Jim

Glenn

Thanks for all the good advice.

Paul Heinrich

Douten said:

I run a mac 1b90 7440 on my c-90 cub and its ok but want to flatten it more for amphib seaplane flying 7436 or so, I use Willy B's 7535 during competitions ( Thanks Bill) and I would recommend using that prop or something flatter for a 140. Also as skywagon8 said get up fast and 140 on floats don't really go together so don't expect too much from the setup .

Click to expand...

I like my 1b90 7440 also on floats but want something lighter for my ex cub.

Glenn

PS. Is Willys prop the one you had on when the girl whoooopped your ass. :lol:

cubdriver2 said:

I like my 1b90 7440 also on floats but want something lighter for my ex cub.

Glenn

PS. Is Willys prop the one you had on when the girl whoooopped your ass. :lol:

Click to expand...

Glenn, talk to Clint(super11xp) on here for lighter prop, he put a catto on his.