iflidou

My Feedback: (111)

Has anyone some information as to the comparison of the above two engines? I have the OS 2.40T with CH synchro-spark ignition and a Saito FA-270T straight. I am looking to put one or the other on a Ziroli 77" PT17. And I need to know if one or the other would be a better engine.
Thanks.
iflidou

William Robison

My Feedback: (3)

Iffy:

With the OS running on gasoline and the Saito on glow there's no comparison. The Saito will beat the pooh out of the OS in every test but fuel burn - the OS will be the big winner in the race for economy.

With both on glow there is much less difference, but I would expect the Saito still to be the winner. It is both larger in displacement and has better cylinder breathing. The weight is close to the same.

Bill.

iflidou

My Feedback: (111)

Thanks Bill.
Now, in YHO will the OS on meth/gas be strong enough to pull around a 22# PT17?

William Robison

My Feedback: (3)

Iffy:

I'll have you know, sir, I have no "Humble" opinions. They are all arrogant.

Haw.

Your having posed the question makes me think you already have the OS, and the Saito would have to be purchased. In that case go with the OS, it should fly the plane very well, and still have a bit more than scale power.

A further note: If you want the plane to be scale, the look of the OS rocker boxes is far closer to scale than the Saito, and if you cobble some dummy cylinders behind the real ones the scale appearance would be even greater. Oops!! Sorry, thinking about the wrong plane. The PT-19 didn't have any cylinders sticking out, its engine was in-line inverted.

Bill.

iflidou

My Feedback: (111)

You either must have not had much sleep last night or spent too much time in church this AM.
The plane is a PT17 and not a 19! as the post above indicates and, yes, the inclusion of dummy cylinders, although presenting much more frontal area is definitely under consideration. I bought the plane from a guy in Indiana and it currently has a big, ole' G45 hanging on the front. I have both the 2.40 and 2.70 and would like to have the plane fly as close to scale. However, I don't want to "white knuckle" each and every take-off and landing as well as whatever comes in between. So thanks for your input. This plane needs a little touch up and I figured I would make the extra effort to make it also sound realistic.
iflidou

William Robison

My Feedback: (3)

Iffy:

Either twin (on alcohol) should have the G45 (burning gas) beaten for power. If the Zenoah is running alcohol it should be the easy winner.

And yes, by golly, you did say PT-17. Sorry.

If you really appreciate the advice send me the Saito as as expression of your thanks.

Haw.

Hope you enjoy the plane.

Bill.

iflidou

My Feedback: (111)

Bill:

Just three things:

1. Who in Hades is "iffy"????????
2. As an expression of my thanks, please hold your breath while I .....
3. Thanks for the input and yuks!

iflidou

William Robison

My Feedback: (3)

Iffy:

I read your user name as "If I do," which means deciding one way or the other is an "Iffy" proposition. Hence you're "Iffy" to match.

I expected no other response to my proposed expression of your thanks, thanks anyway.

We might as well keep it light, too many serious things in the world already.

Bill.

iflidou

My Feedback: (111)

POSITUTELY !!!!

William Robison

My Feedback: (3)

Iffy:

May I now tell my kitten she can start breathing? I wasn't going to hold my breath, but she wanted me to.

Haw.

Bill.