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03 Aug 2020, 08:35 [ UTC - 5; DST ]


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 Post subject: Cessna COAX
PostPosted: 08 Aug 2018, 08:57 
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Joined: 07/21/08
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Location: Decatur , TX (XA99)
Aircraft: 340, Super Cub'ish
Anyone ever heard of this thing? Wiki has nothing, and a google search shows no hits.
Center line thrust from two Allison 250-C20S engines spinning two counter rotating props.
Two engines on the nose... talk about 10lbs of crap in a 5lb. box :bugeye:
It popped up on an instagram post and all I could do was screen shot it. I will post those.

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 Post subject: Re: Cessna COAX
PostPosted: 08 Aug 2018, 08:59 
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Location: Jackson, MS (KHKS)
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On a Caravan? I recall some sort of frankenstein plan like that.


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 Post subject: Re: Cessna COAX
PostPosted: 08 Aug 2018, 09:03 
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Location: Decatur , TX (XA99)
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Cessna 340


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C340 recurrent 10/19
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 Post subject: Re: Cessna COAX
PostPosted: 08 Aug 2018, 09:06 
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Location: Decatur , TX (XA99)
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Pic


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 Post subject: Re: Cessna COAX
PostPosted: 08 Aug 2018, 11:45 
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Joined: 08/12/08
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Location: Charleston, SC and Ada, OK
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Username Protected wrote:
On a Caravan? I recall some sort of frankenstein plan like that.


I think you may be remembering the Soloy (sp?) conversions for the caravan. I believe it was two small turbines driving a single prop/gearbox.


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 Post subject: Re: Cessna COAX
PostPosted: 08 Aug 2018, 15:06 
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Joined: 11/15/17
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Company: Cessna (retired)
This was strictly a concept test bed.

The photo is of the final flight where the tip tanks were removed to test the effects on speed. With only the wing aux tanks (30 gal each?) it was practically in a fuel emergency at takeoff.

I don't have any numbers, but I believe that performance was not quite as good as expected.

Props and prop control system were highly non-standard and a bit awkward. It was said that this project paid the McCauley engineering budget for a year. The drive path for the front and rear propeller were independent and isolated from each other except for the necessary intershaft bearing or in the case of major structural failure. Gearbox was from a small specialty shop with minimal testing beforehand (it was spun, but not under power or prop load.


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 Post subject: Re: Cessna COAX
PostPosted: 08 Aug 2018, 15:20 
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Joined: 01/23/13
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Company: Kokotele Guitar Works
Location: Albany, NY
Aircraft: C-182RG, C-172, PA28
Holy cow, I can't believe there was room to cram two engines and the nose gear in there. Are those Allison engines tiny?

I'm wondering why they wouldn't try it with a single larger turbine like a PT-6?


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 Post subject: Re: Cessna COAX
PostPosted: 08 Aug 2018, 17:44 
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Joined: 01/29/09
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Company: retired corporate mostly
Location: Chico,California KCIC/CL56
Aircraft: 1956 Champion 7EC
Pratt and Whitney Twin Pack.
2 engines, 1 gearbox, one prop.

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soloed in a land of Superhomers/ Cessna 150, retired with Proline 21/ CJ4.


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