18 Apr 2024, 23:15 [ UTC - 5; DST ]
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Post subject: Cessna COAX Posted: 08 Aug 2018, 08:57 |
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Joined: 07/21/08 Posts: 5456 Post Likes: +6171 Location: Decatur, TX (XA99)
Aircraft: 1979 Bonanza A36
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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 It popped up on an instagram post and all I could do was screen shot it. I will post those.
_________________ I'm just here for the free snacks
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Post subject: Re: Cessna COAX Posted: 08 Aug 2018, 11:45 |
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Joined: 08/12/08 Posts: 419 Post Likes: +237 Location: Charleston, SC
Aircraft: Big Jet-Little Prop
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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 Posted: 08 Aug 2018, 15:06 |
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Joined: 11/15/17 Posts: 685 Post Likes: +350 Company: Cessna (retired)
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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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