25 May 2025, 05:53 [ UTC - 5; DST ]
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Post subject: Re: First 7-Bladed MT-Propeller Certified on Pilatus PC-12  Posted: 21 Aug 2020, 16:45 |
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Joined: 08/24/13
Posts: 9697
Post Likes: +4526
Company: Aviation Tools / CCX
Location: KSMQ New Jersey
Aircraft: TBM700C2
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Username Protected wrote: If so, then turbofans are gonna be really disappointed... Jim, I can't find it but somewhere on BT there was a thread about 2/3/4 bladed props and it was put forth that the "perfect" prop would be 1 blade with counterweight on the other side it would always be running in clean air. 
And a 0-blade prop has nothing but clean air
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Post subject: Re: First 7-Bladed MT-Propeller Certified on Pilatus PC-12 Posted: 21 Aug 2020, 17:35 |
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Joined: 11/30/12
Posts: 4794
Post Likes: +5416
Location: Santa Fe, NM (KSAF)
Aircraft: B200, 500B
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Username Protected wrote: If so, then turbofans are gonna be really disappointed... Jim, I can't find it but somewhere on BT there was a thread about 2/3/4 bladed props and it was put forth that the "perfect" prop would be 1 blade with counterweight on the other side it would always be running in clean air.
It's true that a single blade is the most efficient, but I don't believe it's because it's running in clean air. There are certain losses that are associated with each blade and increase with the number of blades, but the losses have more to do with induced drag and tip losses than passing through disturbed air. As the plane moves forward, each prop blade "sees" clean air.
A 5 or seven blade prop is practical on these planes because a single blade prop long enough to absorb all the HP would be digging furrows on takeoff.
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Post subject: Re: First 7-Bladed MT-Propeller Certified on Pilatus PC-12 Posted: 21 Aug 2020, 20:56 |
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Joined: 03/30/11
Posts: 4154
Post Likes: +2922
Location: Greenwood, MO
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The props on these clown planes are starting to look like a ring of clown shoes.  What do you say to that, JC? Uh, Crandall? Buehler? Oh yeah...  Attachment: 5F7B6E9A-020D-4382-8AD5-6F58C0556722.jpeg Attachment: 3C4FEBF1-0653-415E-BEB3-3AF70F34DD99.png
Please login or Register for a free account via the link in the red bar above to download files.
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Post subject: Re: First 7-Bladed MT-Propeller Certified on Pilatus PC-12 Posted: 22 Aug 2020, 09:39 |
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Joined: 10/22/08
Posts: 5054
Post Likes: +2889
Location: Sherman, Tx
Aircraft: 35-C33, A36
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Dang that is ugly looking! Of course, i'm the guy that wishes i could replace that ugly three blade hartzell scimitar prop on my 550 engine with a lighter, faster, and more efficient 2 blade prop. Leldon
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Post subject: Re: First 7-Bladed MT-Propeller Certified on Pilatus PC-12 Posted: 22 Aug 2020, 10:33 |
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Joined: 11/22/12
Posts: 2829
Post Likes: +2780
Company: Retired
Location: Lynnwood, WA (KPAE)
Aircraft: Lancair Evolution
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Username Protected wrote: the "perfect" prop would be 1 blade with counterweight on the other side it would always be running in clean air. That's the theory, supposedly, but so far as I know the only time that's been tried it didn't work out that way, the single blade prop performed worse by all measures.
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Post subject: Re: First 7-Bladed MT-Propeller Certified on Pilatus PC-12 Posted: 22 Aug 2020, 22:38 |
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Joined: 04/29/13
Posts: 754
Post Likes: +542
Aircraft: C177RG, ATOS-VR
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Username Protected wrote: At the end of the video you can see the prop turning and it clears the tug, so 7 blades would not be a problem. Vince
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Post subject: Re: First 7-Bladed MT-Propeller Certified on Pilatus PC-12 Posted: 26 Aug 2020, 17:17 |
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Joined: 04/09/16
Posts: 564
Post Likes: +167
Location: Utah
Aircraft: MU-2, L-39, SA341B
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Time for the mu2 to get this prop!
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Post subject: Re: First 7-Bladed MT-Propeller Certified on Pilatus PC-12 Posted: 26 Aug 2020, 17:24 |
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Joined: 04/16/08
Posts: 743
Post Likes: +633
Location: Nevada City, CA
Aircraft: Baron 55 w/550s
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I've been told "beauty is as beauty does".
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Post subject: Re: First 7-Bladed MT-Propeller Certified on Pilatus PC-12 Posted: 28 Aug 2020, 08:14 |
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Joined: 11/27/16
Posts: 2298
Post Likes: +3890
Aircraft: B17,18,24,25,29,58,
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Username Protected wrote: I've been told "beauty is as beauty does". At closing time beauty is in the eye of the beer holder. 
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Post subject: Re: First 7-Bladed MT-Propeller Certified on Pilatus PC-12 Posted: 28 Aug 2020, 08:23 |
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Joined: 11/03/08
Posts: 16152
Post Likes: +27110
Location: Peachtree City GA / Stoke-On-Trent UK
Aircraft: A33
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Username Protected wrote: the "perfect" prop would be 1 blade with counterweight on the other side it would always be running in clean air. That's the theory, supposedly, but so far as I know the only time that's been tried it didn't work out that way, the single blade prop performed worse by all measures.
not uncommon on self-launched gliders. It stows away much easier when you need to retract it for gliding.
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