help with purchase decission

[mike_elliott]

 I've been thinking about the conversion as my hangar mate had an Ovation and went this way. He told me I wouldn't believe the difference.

 

He's right. It makes a new plane out of the Ovation

[tascher]

Agreed. The Ovation is a completely different plane post conversion. To the TBO and fuel flow questions:

Although the bump from 2500 to 2700 is significant, TBO is unchanged. There are thousands of 2700 rpm redline, 2000 hour TBO IO550s out there in the Cirrus SR22 fleet.

Fuel flow is another matter. Higher rpms / more power demand more fuel. The max fuel flow on a converted Ovation is set dramatically higher. If you want to run flat out, you're going to inhale fuel. The plane is not, however, any less efficient post conversion. Pull the prop back and you're flying the same plane as you were preconversion. I'd believe the only point in the power chart with any inefficiency when compared to a 2 blade Ovation is below 65% power. My understanding is that the drag from the 3rd blade begins to take its toll at lower power settings. The same drag becomes a benefit on final; the 3 blade Ovation is a little easier to land.

[aviatoreb]

I disagree, life is short, if you have the cash, buy what you want...a lot of people buy sports cars capable of going 150mph but never go above 80, but they love their cars.

+1

[rainman]

Congrats , very cool! Another dentist also (I'm a retired AF periodontist)!

[DS1980]

Geez, trying to figure out what prop to go with is like pulling teeth.

[Rich]

Airplanes are a compromise of all factors. There is not one best prop, it has to do with what kind of flying you do most of the time and also what you may never do. I fly out of a 1,950' strip with trees at both ends. I need the three blade prop- it's not a choice. If you would never consider this and you would only fly out of a strip 3'K or more AND you don't care about the compromised climb of the two blade prop, that two blade may be a logical choice. I'll take the "compromise" of losing a few knots since I run my engine soft anyway.

[carusoam]

The Hartzell choices include...

(1) regular Scimitar.

(2) thin Scimitar.

(3) composite Scimitar.

They are light., lighter and lightest... Or Stoutest, stout and less stout...

I'm a little fuzzy about the lightest prop as it is missing the flywheel effect. Every shutdown has an immediate stoppage sort of event.

The T/O with the scimitar at 2700 rpm is 30% shorter than an O1 that is limited to 2500 rpm.

The typical two blade vs three blade argument doesn't apply when HP climbs above 200. There is a similar discussion of three vs four, I'm sure...

How's my memory working?

Best regards,

-a-

[M016576]

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