Extreme Speed Prop Planes Discuss the need for speed with fast prop planes (Screamin Demon, Diamond Dust, Shrikes or any REAL sound breakin'''' plane)

OS91 ducted fan engine with prop.

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Old 07-11-2003, 02:13 PM
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Jim Cattanach
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Default OS91 ducted fan engine with prop.

I have an OS 91 ducted fan engine & pipe.
Is it practical to install this in a sports type plane with a propellor.
If so does anyone know a suitable size prop to use.
I did see something on this subject before, but I cannot find the info.
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Old 07-11-2003, 02:21 PM
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RampRat
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Default OS91 ducted fan engine with prop.

I'm curious about this too... I have one that never will see a fan again... Not if i can help it anyways..
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Old 07-11-2003, 02:28 PM
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Fly Fast n Left
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Default ducted fans

Hi,
Ducted fan motors in planes are generally not a problem as long as the builder has taken the stress forces into consideration. The major problem we run into is where to run the pipe. I have run them through canopies and down the bottom, and all have worked well. Even more important is the prop. These engines are designed to spin up and run at 20k. So to get it that way we have to run small props. I had a rossi .90 df motor in a WM pt-26 for a warbird race and I ran a apc 10-9 at 19,500. This was fast (160ish) but you had to keep an eye on the prop and an eye on who is standing in the arc of the blade. At those kind of rpm's this get scary very fast. So basically no problem, but be carefull!

Jacob
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Old 07-12-2003, 12:38 AM
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nun45
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Default OS91 ducted fan engine with prop.

seems to me that with the shortage of these engines it would be a waste.---henry
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Old 07-12-2003, 12:49 AM
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ChuckAuger
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Default OS91 ducted fan engine with prop.

You'd think the same about all the V12 Allison engines in boats and tractors..until you get to looking around and notice that there just aren't that many planes flying that use those engines. I doubt there are many planes grounded for lack of engine.

OS wants to make money. If there is/was enough demand for 91DF engines they'd still be available (I thought they re-issued them a while back????). I think BVM still offers a 91 DF engine.

I have lots of fan engines, and can assure you none will ever see a fan while I own them.

Does this make me wrong?? No, it makes me the owner of the engines.
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Old 07-13-2003, 06:45 PM
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Default OS91 ducted fan engine with prop.

i do own fan planes and it was just a personal observation. it is not a right or wrong issue. my plane was until recently not even close due to lack of engine. it was just my personal opinion.---henry
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Old 07-13-2003, 08:26 PM
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Default OS91 ducted fan engine with prop.

I use OS df 65 and 77's in sleek pattern and large .45 size mustangs... prop=11x8 apc speed radar timed at 180 plus

randy
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